Onkyo Model 732 amplifier

Model 732 with newly discovered amplifier design

Amplify the input signal without any distortion. This is the most fundamental theme that runs through all efforts when designing an amplifier. But what is distortion and how is it produced? If these questions are not answered it is impossible to create a really excellent amplifier. Of course, every amplifier is designed to reduce distortion. In an ordinary amplifier the distortion is measured by feeding a sine wave into the amplifier. However, this wave form is very rare in real music. Usually live music has many loud and abrupt sounds. They are an integral part of good music but it is this very dynamic sound that causes much distortion due to the poor transient response of many amplifiers. Even if an amplifier has a Total Harmonic Distortion of, for example 0,01% at 1 kHz it does not mean that this amplifier can reproduce music with low distortion. If we consider the "live signal" we find it very complicated and man, without some help cannot analyse it very satisfactorily. That is the reason Onkyo resorted to electronic computer technology to analyse each signal. This computer technology was combined with extensive listening tests in an effort to discover just what distortion is and how it is caused. The result of this research enabled Onkyo to establish a new method for the design of an amplifier. Consequently, model 732 has precise equalization, big phono overload capacity, direct coupling, differential amplifier and pure complementary SEPP circuitry.

 

Equalizer Stage

Transient response is a problem left unsolved by many preamplifiers because their calculations depend on the input being a sine wave. However, this simple wave is quite different from the complex signal produced by live music. As is well known, live music contains many very abrupt and impulsive sounds and has an unbelievably wide dynamic range. The dynamic signal causes distortion in all circuits and must be taken into consideration when designing equipment.

This means that model 732's reproduction is faithful to the original music because it avoids the distortion caused by poor transient response. CAD (Computer Aided Design) is used in model 732 because it is impossible to analyse dynamic music signals with ordinary measuring instruments. By comparing extensive listening tests and the measurements of computers Onkyo was able to discover just what the distortion was and through this research established a new method of designing an amplifier.

In a preamplifier precise equalization is extremely important. To avoid distortion that is caused by saturation in this equalizer stage model 732 has a big phono overload capacity of 320 mV at 1 kHz and 1500 mV at 10 kHz.  The phono overload capacity gets larger with the rise in frequency so that it is the same as that of the RIAA equalization curve. RIAA deflection is ±0,5 dB from 30 to 15,000 Hz. The Signal-to-Noise Ratio is better than 75 dB

 

Power Amplifier Section

An unbelievable amount of effort has been expended in an endeavour to reduce distortion of any kind in the amplifier section of model 732. for this purpose model 732 has pure complementary SEPP, direct coupled and differential amplifier circuitry. The power amplifier circuitry was analysed by a computer but this analysis was not restricted to the audible range. It was extended beyond that range because live music contains many signals in this inaudible range. Onkyo found that the very low frequencies have a very important bearing on the music even though they cannot be heard. Ordinary amplifiers that do not take these very low frequencies into consideration cause a lot of distortion because this disturbance in the very low frequencies causes Intermodulation DIstortion throughout the whole range of the signal. The statistics for this amplifier are very impressive. It is capable of delivering a continuous power output of 56 watts per channel at 8 ohms. The distortion of model 732 is rated at less than 0,02% at 10 watts, 1 kHz. The same low rate of distortion is maintained regardless of whether model 732 is used at full power or played very softly.

The use of a differential amplifier means that this model is extremely stable. Instability in an amplifier will put DC voltage on the loudspeaker terminals and this will lead to distortion . Fluctuations in the power supply.

 

Specifications

Type:  All Silicon Transistor Integrated Stereo Pre-Main Amplifier

Circuit:  Direct-Coupling and Differential Amplifier, Pure-Complementary SEPP System

Semiconductors:  54 Transistors; 20 Diode; 2 Thermistor; 4 Posistor

Main Amplifier (8 Ω  load in case of no indication)

Dynamic Power: 

150 W at 8 Ω  IHF

200 W at 4 Ω  IHF

RMS Continuous Power (Both Channel Driven)

56 W + 56 W at 8 Ω  (1 kHz)

68 W+ 68 W at 4 Ω  (1 kHz)

Total Harmonic Distortion

Less than0,1% at rated output 1 kHz

Less than 0,03% at 0,5 W output 1khz

Less than 0,03% at 10 W output 1 kHz

Intermodulation DIstortion (SMPTE 70 Hz ; 7 kHz = 4 : 1)

Less than 0,05% at 34 W output

Frequency Characteristic :  10 Hz - 80 kHz (+0 -1 dB at normal output)

Power Bandwidth:  10 Hz - 100 kHz (IHF -3 dB, T.H.D. 0,2%)

Signal-to-Noise Ratio:  better than 110 dB (IHF A Network Shunt)

Damping Factor:  100 (DC - 20 kHz)

Load Impedance:  4 ihm - 16 Ω

Input Impedance:  100 k Ω  (10 Hz - 50 kHz)

Gain:  27 dB

Rated Input Voltage:  1 V

Input/Output Characteristics:  in-phase

Output Terminal:

Speaker:  A, B, C, A + B

Headphone

Pre-Amplifier

Input Sensitivity/Impedance

Phono 1 (1,03 kHz) :  2,0 mV / 50 k Ω , 30 k Ω

Phono 2  (MM) :  2,0 mV/ 50 k Ω

Phono 2 (MC) :  83 µV / 80 k Ω

Mic :  1,8 mV / 50 k Ω

Tuner, Aux 1, 2 Play :  100 mV / 100 k Ω

Total Harmonic Distortion :  less than 0,05% (at 1 V output, 1 kHz)

Intermodulation DIstortion : less than 0,05% (at 1 V output, 1 kHz)

Frequency Response

Phono 1, 2 :  30 Hz - 15,000 Hz (±0,5 dB)

Tuner, Aux 1, 2 Play :  10 Hz - 70,000 Hz (+0 -1 dB)

Max. Allowable Input Phono

MM :  320 mV (1 kHz), 1500 mV (10 kHz ) rms

MC :  13 mV (1 kHz), 60 mV (10 kHz) rms

Signal-to-Noise Ratio (IHF A Network Input Shunt)

Phono 1 :  better than 75 dB

Phono 2 (MM) :  better than 75 dB

Phono 2 (MC) :  better than 55 dB

Mic:  better than 69 dB

Tuner, Aux 1, 2 Play:  better than 90 dB

Output Voltage:

Pre-Out 1, 2 (100 k Ω  at load) :  1 V (Rated output); 4 V (Max. Output)

Output  Impedance:

Pre-Out 1, 2 :  2,2 k Ω

Tone Controls (2 dB/step Switch Type)

Treble :  ±10 dB at 100 kHz, 30 kHz

Bass :  ±10 dB at 100 Hz, 30 Hz

Turnover Frequency

Treble :  2,5 kHz, 8 kHz

Bass ;  400 Hz, 125 Hz

Filter

High Filte (-3 dB) :  7 kHz 12 dB/oct

Low Filter (-3 dB) :  70 Hz 12 dB/oct

Muting:  -20 dB

Loudness :  VR -30 dB , 6 dB (at 100 Hz)

Transient Killer Operation Time

When SW is turned On :  3 sec

When SW is turned Off :  0,5 sec

Power Requirements:  AC 100, 110, 120, 220, 240 V  50/60 Hz

Power Consumption:  80 W

Dimensions (W x H x D):  437 x 136  x 355 mm (17,5" x 5,4" x 14")

Weight:  12,5 kg (27,5 lbs)

 

Onkyo DX-7500 cd player

Onkyo DX-7500 is a fully featured Compact Disc player. It features dual 18-bit D/A converters with eight-times oversampling at 352,8 kHz. The player also makes extensive use of optical signal transmission and isolation techniques.

Onkyo's Opto-Drive system is claimed to completely eliminate any electromagnetic interference from the outputs of D/A converters by using phototransitors instead of diodes to regulate the power-supply voltage to the converts. Optical coupling between the digital and analog circuitry of the DX-7500 eliminates the possibility that digital signals could leak into the analog sections and degrade the output quality. The analog audio outputs are supplemented by two digital outputs - electrical and optical - for use with an external D/A converter.

In addition to its internal sophistication , the DX-7500 offers almost every feature one could hope to find in a CD player. Besides the usual operating functions, including repeat of a track, disc, or any selected portion , it has a Time Editing feature that determines how many tracks can be accommodated on each side of a tape cassette.

The memory system can be programmed to play up to twenty tracks of a CD in any order, and a Memory Edit feature allows the program to be modified at any time. The player haas a shuffle-play mode, in which all the tracks on a disc are played back in a random order. It also provided direct keypad access to any numbered track.

 

Specifications

Signal Readout System:  Optical non-contact

Reading Rotation:  About 500 - 200 rpm (constant linear velocity)

Linear Velocity:  1,2 - 1,4 m/s

Error Corection System:  Cross Interleave Raedsolomon Code

Decoded Hits:  18 bits linear

Sampling Frequency:  352,8 kHz (eight-times oversampling

Number of Channels:  2 (stereo)

Frequency Response:  5 Hz - 20 kHz

Total Harmonic Distortion:  0,0015% (at 1 kHz)

Dynamic Range:  103 dB

Signal-to-Noise Ratio: 110 dB

Channel Separation:  103 dB ( at 1 kHz)

Wow and Flutter: below threshold of measurability

Output Level: 2 V RMS

Power Consumption:  23 watts

Dimensions (W x H x D):  435 x 131 x 365 mm (17-1/8" x 5-1/8" x 14-7/16")

Weight:  8,8 kg (19,4 lbs)

 

Onkyo T-4055 tuner

 AM /FM Stereo Tuner

Front End

A tuner that catches distant signals along with a lot of noise is almost usless. What is needed is a tuner that catches the signal, detects it and at the same time rejects interference and noise as it recomposes the signal into a fresh sound image. This objective is accomplished in the front end of model T-4055. dual gate MOS FET's are used in the RF and Mixer stages. This design makes the tuner sensitive to weak signals. Since it is able to handle both types of signals model T-4055 can bring a true music image from distant as well as near FM stations. This unit has a spurious noise rejection figure of over 90 dB

 

IF Stages

IF stages play an important part in tuners because they determine the distortion ratio of the whole unit. Model T-4055 is deisgned with 6 IF stages so that distortion can be kept to a minimum. They also provide the needed gain in the tuner. The tuning circuit of model T-4055 employs caramic filters in place of the usual coil and capacitor types. They provide sharp selectivity and broad bandwidth  FM signals are less susceptible to interference but can still be bothered by advers atmospheric conditions and made interference such as ignition noise. In model T-4055, 5 of the 6 IF stages act as limiters to keep out such botheresome interference. This unit has a capture ratio of 1,2 dB and its alternate channel attenuation (selectivity) is better than 80 dB. Model T-4055 takes the worry out of having so many FM stations on the air at the same time. It separates them effectively.

 

Ratio Detector

A ratio detector is needed to convert the FM sugnal into an auio signal. In model T-4055 a very advanced design is used. A look at the ratio detector S curve shows that this tuner provides a very broad bandwidth of 900 kHz, peak to peak, along with perfect linearity. The ratio detector operates in combination with the front end and finely designed IF stages for excellent reception with a minimum of distortion. Model T-4055 keeps distortion to less than 0,2% (mono) and 0,5% (stereo)

 

Muting Circuit

Onkyo designed model T-4055 to be very sensitive and this created a new problem. Interstation moise also ended to incerase along with sensitivity. To eliminate this type of interference there is a special muting circuit controled by a muting switch which is turned on the irritating interstation noise can be eliminated. You will receive the station you want without interference from other signals. However, if you want to listen to a very distant and weak station the muting switch should be turned off or the muting circuit will cut out the desired station also.

 

Automatic FM MPX Section

Model T-4055 boasts of an improved FM stereo/mono automatic switching circuit. Most modern tuners, of course, automatically change from stereo to mono and mono to stereo. Model T-4055 is different and better. It not only detects the 19 kHz pilot carrier which activates the stereo circuit but it also measures the strength of this carrier. If the 19 kHz carrier is not strong enough for good FM stereo reception this tuner will not change to stereo. The purpose of this special circuit is to provide good music at all times whether this music is stereo or mono.

AM Section

The AM sectio od model T-4055 was not neglected either. It sounds much better than you would expect AM to sound because of the advanced circuit technology and latest components that are used. A two gang variable capacitor, ceramic fiters, and a sensitive buikt-in ferrite core antenna are a few of the element that make this AM section highly sensitive and selsctive. It's not as good ass FM, of course, but for AM it's very good.

 

Variable/Fixed Output Level

Model T-4055 has one fixed and one variable output jacks in the rear panel. The fixed output is 0,75 V (FM). The variable output can be changed from 0-2 V (FM). There is a level control knob in the front panel for changing the output from 0 - 2 V (FM)

 

Multipath Detection System

Usually an oscilloscope must be used when trying to point the antenna in any direction for best reception of a particular station. Model T-4055 also has an output so that an oscilloscope can be used to find the directtion for optimum reception. But  Model T-4055 also has something alse - a Multipath Detection System. With this model it is possible to hear the multipath sound directly through the right speaker. The operation is simple. Set the lever in the back of the panel to Multipat Detection. Turn the antenna until you hear the least noise coming from the right speaker. That is the position for best reception.

 

Specifications

Type:  Solid State AM/FM Stereo Tuner

Semiconductors:  39 Transistor (2 FET), 36 Diodes

Tuning Range: 

FM :  88 - 108 MHz

AM :  530 - 1605 kHz

Sensitivity:

FM :  1,7 µV (IHF)

AM : 20 µV , 150 µV/m

Intermediate Frequency:

FM :  10,7 MHz

AM :  455 kHz

Capture Ratio:

FM :  1,2 dB

Image Rejection Ratio:

FM :  95 dB (98 MHz)

AM :  33 dB (1 MHz)

AM Suppresion Ratio: 

FM :  55 dB

Signal-to-Noise Ratio

FM :  70 dB (IHF)

AM :  50 dB (30%, 1 mV input)

Alternate Channel Att. : 

FM :  80 dB

Total Harmonic Distortion

FM :  0,3% (mono), 0,5% (stereo)

AM :  0,5

Frequency Response;

FM :  20 - 15,000 Hz (+0 -2 dB)

MPX Separation

FM :  40 dB (400 Hz); 35 dB (100 - 10,000 Hz)

Carrier Leakage:

FM :  -70 dB

Output Impedance:  2,5 k Ω  (Fixed); 1,5 k Ω  (Variable Max)

Output

FM :  0 - 2 V (Variable); 0,75 V (Fixed)

AM :  0 - 0,6  V (Variable); 0,2 V (Fixed)

Antenna : 

FM :  300 and 75 Ω

AM :  Ferrite Core Antenna

Power Supply:  AC 110/ 120/ 220/ 240 V 50/60 Hz

Dimensions (W x H x D) :  423 x 136 x 355 mm (16-5/8" x 5-3/8" x 14")

Weight:  7,1 g (15,65 lbs)

Onkyo Integra 725 amplifier

 Preamplifier Section

Equalizer Stage

One problem that is not taken care of by many preamplifiers is transient response because their measurements depend on the input being a sine wave. Unfortunately, this simple wave is not the same as the comlex signal produced by live music. The real dynamism of live music comes from its many abrupt and impulsive sounds. It is this dynamic sound that can cause distortion due to poor transient response in all circuits if nothing is done to prevent it in the design of the equipment. In the equalizer stage in particular this problem of transient response must be handles because this is the input stage for the music signal. If the signal is distorted in this first stage it gets worse and worse until the distortion destroys all listening pleasure.

Precise equalization is one of the very important features of a preamplifier. To avoid any distortion that might come from saturation in this equalizer stage model 725 has a big phono overload capacity of 200 mV at 1 kHz and 930 mV at 10 kHz. The phono overload capacity gets larger with the rise in frequency so that it is the same as that of the RIAA  equalization curve. RIAA deflection is ±0,5 dB from 30 to 15,000 Hz. The signal to noise ratio is better than 70 dB.

 

Tone Control

The Tone Control is put in model 725 so that each individual can adjust the tone to fit his own taste in music. The Tone Control has click stops and each stop represents 2 dB up or down. High grade components have been selected for the Tone Control so there is always exact response, low distortion and high stability.

 

Transient Killer

Model 725 has been equipped with the Transient Killer to prevent the usual disturbing noise that you hear when an ordinary amplifier is switched on or off. The Transient Killer in this model guarantees that there will be no irritating sounds to disturb your music enjoyment every time you turn the set on.

 

Power Amplifier Section

Model 725 is the fruit of Onkyo's tireless efforts to reduce distortion of any kind in the amplifier section of its equipment. Distortion is reduced in model 725 because of the quasi complementary SEPP, direct coupled and differential amplifier circuitry. The computer was used to analysis the very complex music signal and this analysis extended outside the audible range. This extensive measurement was necessary because Onkyo found that the very low frequencies have a distinct influence on the music even though they cannot be heard by the human ear. Ordinary amplifiers do not take these very low frequencies into consideration and consequently cause a lot of Intermodulation Distortion.

The statistic for this amplifier are very excellent. It is capable of delivering a continuous power output of 22 watts per channel at 8 ohms. The Total Harmonic Distortion of model 725 is rated at less than 0,05% at 10 watts, 1 kHz.

 whether used at full power or very low output the same low distortion rate is maintained. Stability is enhanced by the use of a differential amplifier, instability in an amplifier will put DC voltage on the loudspeaker terminals which will causes excessive distortion.

Fluctuations in the power supply voltage and temperature can also cause distortion but these fluctuations are solved by the differential amplifier. The OCL circuitry is an added reason why this model has less distortion, a flatter response over the whole frequency range and especially good damping in the lower frequency range.

 

Top Panel Connectors and Large Heat Sink

Model 725 has all its connectors centralized on the top panel so that connecting and disconnecting is simplified. This is especially true if the amplifier is placed against a wall. Instead of having connectors in the rear panel this model uses the rear panel as a large Heat Sink which helps to protect the power transistors as well as the rest of the amplifier. This is important because of the change in the capacity of the transistor. However, because of the large Heat Sink in model 725 it always stays cool no matter how long it is used at full power.

 

Multi step-up terminals

The design of model 725 is unique in that its preamplifier and main amplifier can be used separately. This design opens up new possibilities for the music lover because model 725 can easily be the base of a multi-amplifier stereo system if either model 624 or 613 is added. These two model are dividing amplifiers and they do the job of separating and amplifying the signals before they are passed on to the tweeter, mid-range speaker, and woofer. If only one extra unit is added your system is up-graded to a bi-amplifier system. If two units are used your system will become a tri-amplifier system. The top panel of model 725 makes connecting and disconnecting very easy because all the terminals are located on the top of the  unit and not in the back as is the case with most units.

 

Specifications

Type:  All Silicon Transistor Integrated Stereo Pre-Main Amplifier

Circuit:  Direct-Coupling and Differential Amplifier, Quasi-Complementary SEPP System, Transistor 29, Diode 18, Therminator 2

Main Amplifier (8 Ω  load in case of no indication)

Dynamic Power:

70 W (IHF) zt 8 Ω

100 W (IHF) at 4 Ω

RMS Continuous Power

22 W + 22 W (8 Ω  , 1 kHz) Single Channel Driven

27 W + 27 W (4 Ω , 1 kHz) Single Channel Driven

Total Harmonic Distortion

At Rated Output (1 kHz) :  less than 0,1%

At 0,5 W Output (1 kHz) :  less than 0,05%

At 10 W Output (1 kHz) :  less than 0,05%

Intermodulation Distortion:  less than 0,05% at 10 W output (SMPTE 70 Hz : 7 kHz = 4 : 1)

Frequency Characteristic:  15 Hz - 70 kHz ( +0 -1 dB at normal output)

Power Bandwidth: 10 Hz - 100 kHz (IHF -3 dB T.H.D. 0,5%)

Signal-to-Noise Ratio :  better than 100 dB (IHF-A network)

Damping Factor:  60 (DC  - 30 kHz)

Residual Noise:   0,001 µW (IHF input shunt)

Load Impedance:  4 Ω  - 16 Ω

Input Impedance:  100 k Ω  (10 Hz - 50 kHz)

Gain:  22 dB

Rated Input Voltage:  IV

Input ?Output Characteristics:  In-phase

Pre-Amplifier

Input Sensitivity/Impedance

Phono 1 :  2,4 mV / 50 k Ω  and 100 k Ω

Phono 2 :  2,4 V / 50 k Ω  (1,03 kHz)

Tuner, Aux-1, Aux-2 and Play :  100 mV / 100 k Ω

Total Harmonic Distortion :  less than 0,05% at 1 V output (1 kHz)

Intermodulation Distortion :   less than 0,05% at 1 V output (1 kHz) (SMPTE 70 Hz : 7 kHz = 4 : 1)

Frequency Response:

Phono 1, Phono 2 :  50 - 15,000 Hz (±0,5 dB RIAA Characteristics

Tuner, Aux-1, Aux-2, Play :  10 - 60,000 Hz (+0 -1 dB at 1 V output)

Max. Allowable Input (Phono):  200 mV (at 1 kHz); 930 mV (at 10 kHz)

Signal-to-Noise Ratio (IHF A Network Input Shunt)

Phono 1, Phono 2 :  75 dB

Tuner, Aux-1, Aux-2, Play :  90 dB

Output Voltage? Impedance

Pre-Out 1, Pre Out 2 (100 k Ω  at load) :  IV (rated output);. 4 V (max output) 2,5 k Ω

Rec Out:  100 mV (rated output open terminal voltage) 30 k Ω  (phono)

Tone Control (2 dB/step switch type)

Treble :  ±10 dB at 10 kHz

Bass :  ±10 dB at 100 Hz

Filter: 

High :  6 dB/oct  at 8 khz

Low :  6 dB/oct at 70 Hz

Muting:  -20 dB

Loudness:  6 dB at 100 Hz (VR -30 dB position)

Input/Output Characteristics:  in-phase

Transient Killer Operation Time:  3 sec when SW is turned On

0,5 sec. When SW is turned Off

Power Requirements:  AC 110/120/220/240 V, 50/60 Hz

Power Consumption:  30 W

AC Output:  Switched, Unswitched

Dimensions (W x H x D):  313 x 366x 136 mm (12,%" x 15,6" x 5,4")

Weight: 8 kg (17,6 lbs)

Onkyo CP-1030F turntable

An incredible sound experience awaits you. An experience that technology alone finds hard to explain. You'll hear music of such stunning purity and sensual richness, that you'll wonder how any turntable could make that much of a difference.

That's the secret of Onkyo. The unique ability to take you several steps beyond pure technology, to a world of more exciting sound. And we provide it in all our components, including all five of our turntables.

The Onkyo CP-1030F Full Automatic Turntable is an outstanding example. Its unique design lets you take much fuller advantage of today's most sensitive high-compliance cartridges, providing more perfect record groove tracking and more perfect damping of the vibrations that destroy perfect sound quality.

The Onkyo CP-1030F utilizes a uniquely designed low mass, straight-line carbon fiber tonearm and headshell. Its construction assures purer sound even with warped records. Infrared sensors replace the usual mechanical devices that detect the end of record play - returning the tonearm more silently to the Off or Repeat position. Manual cueing is also smoother and more precise, with far less lateral drift during stylus descent.

A Quartz-locked DC direct-driver motor, with an LED illuminated strobe, assures rotational speed accuracy. And a separate motor controls automatic tonearm movement functions.

The entire turntable rests on a highly stable triple-insulated suspension system to isolate it from room vibrations and sound vibrations from your speakers.

Styling is superb.

Silver-grey with black, low lustre metal and a crystal dust cover. Feather-touch control buttons are front-panel mounted, with a full array of LEDs indicating all function setting.

The CP-1030F is just one of five remarkable turntables from Onkyo.

Specifications

Type:  2-speed fully-automatic turntable with cueing lever

Turntable Platter:  310 mm (12-3/16") aluminum die-cast

Motor:  Brushless, coreless, slotless, DC Quartz Direct Drive

Speeds:  33-1/3 rpm, 45 rpm

Wow and Flutter:  0,03% WRMS

Signal-to-Noise Ratio:  75 dB (DIN B)

Tonearm:  Static balanced straight pipe

Effective Arm Length:  224 mm (8-13/16")

Overhang:  13 mm (1/2")

Maximum Tracking Error:  +3 degrees, -1 degree

Usable Cartridge Weight:  Min. 5,0 g; Max. 8,5 g

Power Supply Rating:  AC 110-120, 220-240 V, 50/60 Hz (or 240 V at 50 Hz. 120 V at 60 Hz, only)

Power Consumption:  6 watts

Dimensions (W x H x D):  453 x 370 x 133 mm (17-7/8" x 14-1/2" x 5-1/4")

Weight:  6,5 kg (14,3 lbs)

Cabinet Composition

Turntable Board:  Polystyrene

Bottom Board:  Fiber Reinforced Polyethylene

Dust Cover:  Polystyrene

Onkyo TA-2058 cassette deck

The Integra Series

Onkyo's Integra sound is one that comes as close as possible to duplicating the abundance of energy and the richness of detail of a live performance. Whether you're seking to capture all the tonal colors that a symphony orchestra is capable of creating, or the synthesized, electronically amplified sounds of modern music, the cassette decks introduced here are designed to bring them to you with astonishing realism. They represent Onkyo's high technology achievements constantly refined through listening tests by experts. You'll have to operate and listen to one of these superb tape decks to understand Onkyo's dedication to excellence in the audio field; the live sound of the Integra Series.

Full Automatic Accubias with 5 Response Positions

Both the TA-2058 and TA-2048 Cassette Deck are equipped with Onkyo's unique Accubias system for fine tuning the recording bias to achieve the widest, flattest frequency response possible. On the TA-2058 , Accubias is completely automatic; the optimum amount of bias is applied for each tape type. There are aso 5 preset frequency rsponse positions so that the user can manually set the bias to obtain the desired sonic characteristics. Proper biasing is essential for high quality recording, and Onkyo has made great strides in bias accuray, automation and the elimination of guesswork.

4-Digit Real Time Tape Counter

A 4-digit LED displays the minutes and seconds elapsed since tape fransport was started or the time remaining. Instead of just a tape counter, the real time counter gives you the actual program time of the tape you're listening to. This means no more guesswork, for instance, about how much actual time is left on a cassette when recording. Locating a particular song or editing becomes much easier. There are a series of tape length selector buttons below the time display compatible with all standard cassette formats.

Other Features:

3-Motor, 3-Head configurtation with Special Hard permalloy

Silent tape transport with Micro-Computer Control

Auto Space Function

Automatic-Music Control System

Dolby B, C and HX-PRO

Two repeat modes

Two 10 segment, 2-color LED level indicators

Separate left and right microphone jacks

Rec/Play timer switch

Memory Play and Stop switch

MPX filter with on/off switch

Compatible with RC-5T remote control unit

Optional wood grain side panels (CW-K58) can be attached for added elegance

Specifications

Track Format:  4-tracks, 2-channels

Erase System:  AC erase

FF and Rewind Time:  90 sec. (C-60)

Wow and Flutter:  0,045% (WRMS)

Frequency Response:

Metal Tape :  20 - 19,000 Hz (30 - 18,000 Hz ±3 dB)

High Position Tape :   20 - 18,000 Hz (30 - 17,000 Hz ±3 dB)

Normal Tape :  20 - 17,000 Hz (30 - 16,000 Hz ±3 dB)

Signal-to-Noise Ratio:  60 dB (Metal, Dolby Nr Out)

Inputs [Sensitivity/Impedance]:

Line In Jacks :  [2] 60 mV/50 k Ω

Microphone Jacks : [2] 0,6 mV(600 Ω) /5,6 k Ω

DIN in Jack :  [1 EU models] 0,1 mV(1 k Ω) /2,7 k Ω

Outputs [Level/Impedance]:

Line Out Jacks :  [2] 500 mV (0 dB)/more than 50 k Ω

Headphone Jack :  [1] -/8 - 200 Ω

DIN Out Jack :  [1 EU models] 500 mV (0 dB)/more than 50 k Ω

Motors:  3 motor system, DC servo Motor x 1 , DC motor x 2

Heads:  Rec/Pb Special hard permaloy  x 1; Erase, Ferrite x 1

Power Supply Rating (4 types):  AC 120/220 V Switchable 50/60 Hz

Dimensions (W x H x D):  435 x 112 x 360 mm (17-1/8" x 4-3/8" x 14-1/8")

Weight:  6,1 kg (13,4 lbs)

Onkyo TA-2048 cassette deck

Onkyo Integra 3-Motor, 3-Head Cassette Deck

Special Hard permalloy

The 3-head design has some distinct advantages over the conventional combined Pb/rec format. Since the playback and recording heads are separate, the playback head gap width can be made narrower than the recording head so it can capture with greater precision the higher frequency sounds. For durability and improved metal tape compatibility the rec and pb heads are fashioned out of Special Hard Permalloy. This format also lets you monitor (from tape) what you.ve just recorded so you can fine tune and optimize the recording level. The 3-motor system achieves superb stability and reliability in tape transport. A servo controlled capstan motor is the ultimate in self-correcting precision, and the rell table motor further contributes to eliminating wow and flutter. The head block is moved into place by its own independent motor for optimum functionality and precision.

Silent Tape Transport with Micro-Computer Control

When tape transport begins, the head block is silently and smoothly lifted into position. Besides eliminating annoying start-up noises, this micro-computer controlled system avoids mechanical shocks that could cause misalignments of head azimuth and transport parts. Also, much less power is needed, so there's no need for oversized transformers in the power supply which might be potential sources of hum and induction noise.

Auto Space Function

This very simple but useful feature automatically inserts a 5-second silent space in the tape when the Auto Space button is pressed. Later, in playback, the AMCS automatic search system will detect these pauses electronically and stop the tape at just the right spot.

Automatic-Music Control System (AMCS)

This function allows you to skip forward or reverse to the beginning of the adjacent section of recorded music. The first 10 seconds of that section are played and then scanning continues, playing the first seconds of each successive track until the play button is pressed. With AMCS you can quickly search for the section of a tape you're looking for , or quickly scan the entire contents of a tape.

Dolby B, C and HX-pro

Conventional Dolby B reduces noise in the higher frequency ranges while the newer Dolby C does the same for the high and middle ranges where tape hiss and modulation noise, though less audible, can still degrade fidelity. The TA-2058 is additionally equipped with HX-Pro which constantly monitors the high frequencies in the audo signal and adjust the bias current for optimum flat frequency response. When recording music with a lot of high frequency peaks, HX-pro will automatically lower the bias to allow for the additional high range "headroom" required to capture these sounds without running into tape saturation and distortion problems.

Two repeat Modes

The single and full repeat modes allow you to repeat a single song if you like or to listen to a whole cassette side a second time.

Specifications

Track Format:  4-tracks, 2-channels

Erase System:  AC erase

FF and Rewind Time:  90 sec. (C-60)

Wow and Flutter:  0,045% (WRMS)

Frequency Response:

Metal Tape :  20 - 19,000 Hz (30 - 18,000 Hz ±3 dB)

High Position Tape :   20 - 18,000 Hz (30 - 17,000 Hz ±3 dB)

Normal Tape :  20 - 17,000 Hz (30 - 16,000 Hz ±3 dB)

Signal-to-Noise Ratio:  60 dB (Metal, Dolby Nr Out)

Inputs [Sensitivity/Impedance]:

Line In Jacks :  [2] 60 mV/50 k Ω

Microphone Jacks : [2] 0,6 mV(600 Ω) /5,6 k Ω

DIN in Jack :  [1 EU models] 0,1 mV(1 k Ω) /2,7 k Ω

Outputs [Level/Impedance]:

Line Out Jacks :  [2] 500 mV (0 dB)/more than 50 k Ω

Headphone Jack :  [1] -/8 - 200 Ω

DIN Out Jack :  [1 EU models] 500 mV (0 dB)/more than 50 k Ω

Motors:  3 motor system, DC servo Motor x 1 , DC motor x 2

Heads:  Rec/Pb Special hard permaloy  x 1; Erase, Ferrite x 1

Power Supply Rating (4 types):  AC 120/220 V Switchable 50/60 Hz

Dimensions (W x H x D):  435 x 112 x 360 mm (17-1/8" x 4-3/8" x 14-1/8")

Weight:  5,8 kg (12,7 lbs)

Onkyo TX-200 receiver

Quartz Synthesized Tuner Amplifier with Automatic Precision Reception System

Specifications

Amplifier Section

Power Output:  38 watts per channel (min. RMS, at 8 Ω, both channels driven, from 20 - 20,000 Hz, with no more than 0,08% T.H.D.)

Music Power Output (DIN):

2 x 80 watts at 4 Ω (1 kHz)

2 x 53 watts at 8 Ω (1 kHz)

Continuous Power Output (DIN):

2 x 50 watts at 4 Ω (1 kHz)

2 x 40 watts at 8 Ω 91 kHz)

Total Harmonic Distortion:  0,08% at rated power ( 0,08% at 1 watt output)

IM Distortion:  0,08% at rated power ( 0,08% at 1 watt output)

Damping Factor:  35 at 8 Ω

Frequency Response :  20 - 30,000 Hz ±1 dB

RIAA deviation:  20 - 20,000 Hz ±0,8 dB

Sensitivity/Impedance:

Phono :  2,5 mV/50 k Ω

Tape Play :  150 mV/50 k Ω

Tape rec :  150 mV/3,5 k Ω

Phono Overload:  180 mV RMS at 1 kHz (0,08%T.H.D.)

Signal-to-Noise ratio:

Phono :  85 dB (at 10 mV input, A weighted);  75 dB (IHF)

Tape :  95 dB (A weighted);  80 dB (IHF)

Tone Controls

Bass :  ±8 dB at 100 Hz

Treble :  ±8 dB at 10 kHz

Loudness (volume at -30 dB):  +7 dB at 70 Hz;  +5 dB at 10 kHz

FM Tuner Section

Tuning Range:  87,5 - 108,0 MHz (50 kHz steps)

Usable Sensitivity:

Mono :  12,8 dBf (1,2 µV)

Stereo :  18,0 dBf (2,2 µV)

50 dB Quieting Sensitivity:

Mono :  18,0 dBf (2,2 µV)

Stereo :  37,2 dBf 920 µV)

Capture Ratio:  1,5 dB

Image rejection ratio:  85 dB

IF Rejection ratio:  90 dB

Signal-to-Noise ratio:

Mono :  71 dB

Stereo :  66 dB

Selectivity:  50 dB DIN (±300 kHz, 40 kHz dev.)

AM Suppression Ratio:  50 dB

Harmonic Distortion:

Mono :  0,15%

Stereo :  0,3%

Frequency Response:  30 - 15,000 Hz ±1,5 dB

Stereo Separation:  40 dB at 1 kHz;  30 dB at 100 - 10,000 Hz

Muting level : 17,2 dBf (4,0 µV)

Stereo Threshold:  17,2 dBf (4,0 µV)

AM Tuner Section

Tuning Range:  522 - 1,611 kHz (9 kHz steps)

Usable Sensitivity:  30 µV

Image Rejection Ratio:  40 dB

IF Rejection Ratio:  30 dB

Signal-to-Noise Ratio:  40 dB

Harmonic Distortion:  0,8%

General

Semiconductors:  34 Transistors;  81 Diodes;  10 ICs;  6 FETs

Power Supply:  Ac 220 - 240 V 50/60 Hz

Dimensions (W x H x D):  418 x 112 x 340 mm (16-1/2" x 4-1/2" x 13-3/8")

Weight:  7,1 kg 915,6 lbs)