Spectro Acoustics 101B preamplifier

Spectro Acoustics Model 101B

Preamplifier/Equalizer

The quality of a stereo component system lies in the audiophil's choice of equipment. The major influence affecting that quality is the interaction and influence of each component on other components and the culmination of those influences on the human ear. This is where the choice is made in selecting "quality" and whether to accept a particular sound as "right"

All things considered, the perfect listening environment is still the concert hall and reproduction of music must remain subjective. However, we want control over what we hear and have the facility to change what it is that reaches our ears. In musical reproduction this function is relegated to the concepts of tonal compensation, balance and volume. The equipment corollary is the modern preamplifier; a device which offers control over the amount of sound reaching our ears and which particular source we will listen to, (whether it be a tape recording, a phonograph record or a radio broadcast). In most cases, there is the ability to change the tonal content at specifically designated frequencies.

Spectro Acoustics, in attempting to obtain maximum performance value, offers the Model 101B preamplifier/equalizer for audiophiles who want the most in flexibility and performance at a reasonable price.

The Spectro Acoustic Model 101B  in order to optimize reliability and serviceability, is designed and constructed to utilize plug-together glass-epoxy circuit boards and 100% monolithic IC circuitry for consistent performance. All controls and connections are human engineered to give simple straight forward operation. The graphic panel of the 101B is a display of exactly what's going on inside of the unit. Control is at the user's finger tips to seek the level and range of sound that achieves personal satisfaction.

The equalizer circuit for the Model 101B is a totally new type based on Spectro Acoustics gyrator synthesis techniques similar to those used in the Model 210 Graphic Equalizer. The design is a hybrid coil/gyrator type which totally eliminates distortion and hum for equalizer circuitry. The filter parameters are optimized for maximum flexibility from a five band design and as an added benefit the highest and lowest frequency bands are "shelving" type to control the response well beyond are "shelving" type to control the response well beyond the extremes of audibility. The usefulness of the equalizer circuitry is further enhanced through its complete availability to line or tape outputs, or total bypass for equalization in/out comparisons.

In phono stage, the Model 101B utilizes an isolated feedback servo op-amp phono stage with ultra-accurate adherence to the RIAA curve. This circuit provides for accurate cartridge response, increased definition of high frequencies and greater dynamic range. Internally accessible cartridge loading components can be adjusted by any qualified and authorized technician to perfectly match the cartridge load for any cartridge.

Specifications

Total Harmonic Distortion:  less than .05% at 2 volts rms output, 20Hz to 10kHz, 10 k Ω  load

Intermodulation Distortion; less than .01% at any output level below clipping, 7kHz and 60 Hz mixed 1 to 4 (SMPTE)

Noise

Phono Stage:  less than 2 mV equivalent input noise, 20Hz to 20kHz, inputs open or shorted (S/N ratio = at least 74 dB below 10 mV reference) Better than 88 dB below full output (ASA standard "A" weighting)

High Level & EQ Stages:  less than 30 mV equivalent input noise, 20Hz to 20kHz, inputs open or shorted (S/N ratio = at least 90 dB below 1 V reference) Better than 100 dB below full output (ASA standard "A" weighting)

Frequency Response: 

Phono Stage : within 0,5 dB of true RIAA equalization, 20Hz to 20kHz, typically within 0,1 dB

High Level Inputs : within 0,1 dB of absolutely flat response, 20Hz to 20kHz, within 3 dB of absolutely flat response, 5Hz to 100kHz

Gain

Phono Stage :  40 dB at 1 kHz, phono stage alone, 50 dB at 1 kHz, phono +line amplifier (main outputs)

High Level Stage :  10 dB with Level controls set to maximum

Equalizer Stage :  Plus or minus 15 dB nominal range of adjustment, within 0,1 dB of unity gain, controls set flat

Dynamic Range

Phono Stage : Overload point is 100 mV at 1 kHz input

High Level Stage :  Overload point is 10 V at 1 khz into 10 k Ω  load

Port Impedances

Phono Units :  47 k Ω  shunted by 220 pF (internally adjustable)

High Level Inputs :  50 k Ω  shunted by 10 pF

Tape Inputs less than 600 Ω , resistive, direct coupled

Main Output :  less than 600 Ω , resistive, direct coupled

Output Capabilities

Rated Output:  2 volts rms into 10 k Ω  load, resistive

Output at Clipping :  Greater than 9 volts rms into 10 k Ω  load, greater than 5 volts rms into 600 Ω  load at 1 kHz

Protection:  Fully protected against short circuits at any output level

Power Requirements:  110 to 125 VAC, 50/60 Hz, 14 watts (Standard unit); 220 to 250 VAC, 50/60 Hz, 14 watts (Export unit)

Physical Data

Dimensions (W x H x D):  381 x 152,4 x 140 mm (15" x 6" x 5-1/2")

Optional Wood Cabinet (W x H x D):  412,8 x 184,2 x 421,3 mm

Weight :  10 pounds shipping

 

SAE Mark XVII equalizer

Solid State Stereo Octave Equalizer

Control - for many years the need to tailor program material to meet individual tastes has been apparent. Highly sophisticated multi-control systems have been available to meet these needs in the recording studio, on the rock stage and at the concert hall (places where you would find the 2700B). However, the need to control sound in the home has never fully been realized, due to limitations in present consumer designs. There were numerous requests for a modestly priced, quality equalizer to improve old or worn records, and to compensate for speaker performance and room conditions without degradation of sound. The Mark XVII is the answer to these requests, incorporating many of the same unique performance and convenience features as our professional half-octave equalizer,, the 2700B. For example, we use the same long throw oil-damped graphic potentiometers as the 2700B. We feel this offers better accuracy for spectral control and smoother operation. We also incorporate our famous L-C-R network which result in the best balance of performance, low noise, and reliability. The toroid inductors are precision wound at our factory and then hand picked for each model to offer the ultimate in performance.

Finally, the latest in output design is incorporated to ensure that the Mark XVII would affect the sound in no other way than that for which it was intended - the control of frequency response. The Mark XVII can deliver over 11V into a 10 k Ω  or greater load, assuring undistorted performance with any program material. SAE's unequalled talents show through in measurements too-both T.H.D. and Intermodulation Distortion are less than 0,03% and the noise is 90 dB below rated output. We feel that such a level of performance in an equalizer of this size and flexibilty is a true innovation in the audio industry.

 

Features

Octave Control

Twenty precision L-C-R band-pass filters offer octave control for each channel. Precision-wound toroid inductors, low-loss capacitors, and precision-tracking potentiometers result in low noise, low phase shift, and low distortion.

Dual Range

The individual frequency controls operate over a range of +8 dB for program equalization or +16 dB for more drastic modification to room or speaker response. These two ranges are front panel selectable.

Individual EQ Defeat

Front panel selection is available for the individual defeat of the equalization on either channel. This offers A-B comparison between speakers and between equalized and non-equalized program material. You may also simply defeat the equalizer for some program sources.

Output Drive

The high output voltage circuitry delivers over 11 Volts RMS into a 10 k Ω  or greater load. This allows the Mark XVII to be terminated into any unique load configuration without an incrase in distortion or current limiting.

 

Specifications

Frequency Response:  20 Hz - 20,000 Hz ±0,25 dB

Bandwidth:  3 dB down at 6 Hz and 80 kHz

Total Harmonic Distortion (at any level to rated output from 20 Hz to 20 kHz):  less than 0,03%

Intermodulation Distortion (at any level of rated output with any 2 mixed frequencies between 20 Hz and 20 kHz at 4/1 voltage ratio):  less than 0,03%

Signal-to-Noise Ratio :  greater than 90 dB below rated output

Rated Output:  2,5 Volts RMS

Output at Clipping:  greater than 10 Volts into 100 k Ω ; greater than 9 Volts into 10 k Ω

Input Impedance:  100 k Ω

Output Source Impedance:  400 Ω

Output Load Impedance:  10 k Ω  minimum

Insertion Loss:  less than 1 dB with controls centered

Equalizer Range:  ±16 dB or ±8 dB at : 40 Hz,  80 Hz, 160 Hz, 320 Hz, 640 Hz, 1280 Hz, 2500 Hz, 5000 Hz, 10 kHz, 15 kHz

Power Requirements:  110, 125 V AC , 50 or 60 Hz

Power Consumption:  10 watts

Dimensions (W x H x D): 432 x 146 x 178 mm (17" x 5,75" x 7")

Weight:  20 lbs (shipping)

 

SAE Mark XXVIIB equalizer

 

Stereo Half Octave Equalizer

The SEA Mark XXVIIB is a highly sophisticated frequency modification system that compensates for room acoustic, balances speaker response, selectively filters noise, equalizes sound for recording, induces stereo on mono program sources and aids in solving most reproduction problems.

Twenty low-noise, low-distortion band pass filters per channel  are provided where each filters center frequency is separated by one-half octave. The filter range effectiveness is selectable at either ±8 dB max or ±16 dB max. Grain or attenuation on the individual filters are independently controlled by calibrated professional slide potentiometers.

Further flexibility is offered in normalizing room acoustics with the inclusion of a "pink Noise" generator. This generator offers the flexibility of calibrating your system for minimum frequency distortion, as well as checking for proper speaker phasing and energy balance. Utilizing our professionally proven precision wound toroid inductors in the classic L-C-R configuration, the mark XXVIIB provides uncompromising performance with low noise (greater than -100 dB) and low harmonic and Intermodulation Distortion Distortion (0,02 T.H.D. and 0,02 Intermodulation Distortion). The full complementary output circuit offers adequate drive for any equipment the Mark XXVIIB will interface with in home or professional applications.

 

Specifications

Frequency Response:  20 Hz - 20,000 Hz ±0,25 dB

Bandwidth:  3 dB down at 6 Hz and 80 kHz

Total Harmonic Distortion (at any level to rated output from 20 Hz to 20 kHz):  less than 0,02%

Intermodulation Distortion:  less than 0,02%

Signal-to-Noise Ratio :  greater than 100 dB below rated output

Rated Output:  2,5 Volts RMS

Output at Clipping:  greater than 12 Volts into 100 k Ω ; greater than 8 Volts into 600 Ω

Input Impedance:  100 k Ω

Output Source Impedance:  150 Ω

Output Load Impedance:  600 Ω  minimum

Insertion Loss:  less than 1 dB with controls centered

Equalizer Range:  ±16 dB or ±8 dB at 20 Hz, 40 Hz, 60 Hz, 80 Hz, 120 Hz, 160 Hz, 240 Hz, 320 Hz, 480 Hz, 640 Hz, 960 Hz, 1280 Hz, 1800 Hz, 2500 Hz, 3700 Hz, 5000 Hz, 7500 Hz, 10 kHz, 15 kHz, 20 kHz

Power Requirements:  110, 125 V AC , 50 or 60 Hz

Power Consumption:  50 watts

Dimensions (W x H x D): 432 x 222 x 178 mm (17" x 8,75" x 7")

Marantz EQ 351 equalizer

 

Graphic Equalizer

High-value version of EQ551 for uses with no need of microphone input, pink noise generator, input attenuator or decay time switch

Provides 10 dB cut or boost on 10 frequency bands

Independent left and right channel control

Inputs for two tape decks with tape copy

EQ level control

Instant comparisons through Direct switch

 

Specifications

Total Harmonic Distortion :  0,005% (20 Hz - 20 kHz)

Rated Output:  1 V

Frequency Response:  10 Hz - 25 kHz ±1 dB

Signal-to-Noise Ratio :  110 dB

Input Impedance:  110 k Ω  (Line in)

Output Impedance:  3,5 k Ω  (Line out)

EQ Action for Each Channel:   

31,5 Hz; 63 Hz; 125 Hz; 250 Hz; 500 Hz; 1 kHz; 2 kHz; 4 kHz; 8 kHz; 16 kHz (±10 dB)

Power Requirements:  110 - 240 V 50/60 Hz

Dimensions (W x H x D):  420 x 67 x 200 mm

Weight:  2,7 kg

JVC SEA-66 equalizer

SEA-66 Stereo Graphic Equalizer

Features:

10 LED-lit frequency equalizer controls per channel

10-band real-time spectrum analyzer for frequency analysis

Buil-in pink noise generator for room acoustics compensation

3 deck connections with dubbing from 1 to 2/3 , 3 to 1, and 3 to 1

Selectable ±12 dB/  ±6 dB control range

S.E.A. defeat switch

If your living room doesn't have the fine acoustics of music hall, don't despair, the capable SEA-66 is at your command . It is equipped with a spectrum analyzer, a pink noise generator and a mic input, making it a simple procedure to compensate for the individual acoustics of your room. For this purpose, JVC recommends the precisely calibrated MU-S80 microphone.

 a total of 10 equalizer controls per channel are spaced at one octave intervals, giving you tremendous equalizing versatility. Individual controls are tipped with LEDs to graphically display the selected response. The SEA-66 can connect and monitor up to three tape decks and offers complete dubbing capabilities.

Specifications:

Input Impedance

S.E.A. Input :  47 k Ω

Tape Monitor Input :  47 k Ω

Output Impedance

S.E.A. Output :  680 Ω

Tape Rec Output :  680 Ω

Rated Output (Freq. EQ Controls at Flat):  2 V RMS

Maximum Output(Freq. EQ Controls at Flat):  6 V RMS

Total Harmonic Distortion:  0,005% (20 Hz - 20 kHz rated output)

Intermodulation Distortion (Freq. EQ Controls at Flat):  0,005%

Gain:  0 dB

Frequency Response:  10 Hz - 100 kHz +0 -2 dB

Signal-to-Noise Ratio :  115 dB

Center Frequencies:  31,5; 63; 125; 250; 50; 1 k; 2 k; 4 k; 8 k; 16 kHz

Control Range:  ±12 dB/±6 dB

Pink Noise Oscilator Output:  35 mv RMS

Optimum Microphone Sensitivity:  over 72 dB

Optimum Microphone Output/Impedance:  less than  1 k Ω

Dimensions (W x H x D):  435 x 77 x 275 mm

Weight:  3,5 kg

JVC SEA-33 equalizer

S.E.A. Stereo Graphic Equalizer, features:

10 frequency equalizer controls per channel

S.E.A. recording and defeat switches

-6db input atenuator to prevent overload distortion

Transistor inductors for expanded dynamic range

Slim, low-profile styling

While every hi-fi system benefits from the addition of a graphic equalizer, not every system can accommodate a large or costly model. That's why we've developed the SEA-33, the slim equalizer that's perfect for popular packaged component systems and compacts.

Yet it has the same advanced features and performance of our larger models - like transistor inductors for lowest possible noise and distortion, ten equalizer controls per channel, and S.E.A. recording and defeat switches.

The ten equalizer controls cover a range from 31,5 Hz to 16 kHz in one-octave steps, giving you the ability to personalize your sound, and compensate for listening room and equipment deficiencies. One popular use of a graphic equalizer is to make equalized tapes for use in prtables and car stereo. The S.E.A. Rec switch gives you this capability.

Specifications

Input Impedance

S.E.A. Input :  47 k Ω

Tape Monitor Input :  47 k Ω

Output Impedance

S.E.A. Output :  100 Ω

Tape Rec Output :  100 Ω

Rated Output (Freq. EQ Controls at Flat):  2 V RMS

Maximum Output(Freq. EQ Controls at Flat):  7 V RMS

Total Harmonic Distortion:  0,005% (20 Hz - 20 kHz rated output)

Intermodulation Distortion (Freq. EQ Controls at Flat):  0,005%

Gain:  0 dB

Frequency Response:  10 Hz - 50 kHz +0 -2 dB

Signal-to-Noise Ratio :  115 dB

Center Frequencies:  31,5; 63; 125; 250; 50; 1 k; 2 k; 4 k; 8 k; 16 kHz

Control Range:  ±12 dB

Input Attenuator Level:  -6 dB

Dimensions (W x H x D):  435 x 61 x 265 mm

Weight:  3 kg

Soundcraftsmen AE2420-R analyzer/equalizer

Soundcraftsmen's  AE2420-R  Analyzer/Equalizer is claimed to be a "revolutionary breakthrough" in enabling accurate analusis of a room's "imperfections", as ell as compensating for system imperfections. A new concept is used to apply differential/comparator circuitry  to equalization analysis. By sampling the complex waveshapes of a pink noise input signal on the one hand, and the speaker output signal on the other hand, the circuitry of the device converts the complex wave shapes to DC levels; these are then compared through the differential/comparator circuit to provide readout of the exact differential between these two complex waves shapes with an accuracy of 1/1oth dB. Even if the pink noise input amplitude is variable across the spectrum, there is no effect on the analyzer's dB readings because the analyzer is actually looking at both the selected frequency spectrum signals simultaneously, without regard to amplitude. Any good quality low- or high-impedance microphone may be used, regardless of the mike's response curve. The calibrated curve supplied by the microphone manufacturer can be programmed into the obtained flat response curve through use of the "computer charts" the maker of this device provides.

Specifications:

Analyzer Section

Differential Comparator: 

Minimum Input :  75 mV

Differential Measurement accuracy :  ±0,1 dB

Hi Level Input:

Input Impedance :  47 k Ω

Gain :  30 dB max (adjustbetter than)

Frequency Response :  ±0,1 dB 20 to 20,000 Hz

Mic Preamp: 

Input Impedance :  200 Ω or 20 k Ω (switchable Lo or Hi Z)

Gain :  80 dB max.

Frequency Response :  ±0,1 dB 20 Hz to 20,000 Hz

Pink Noise Source: 

Internal Generator Level :  approx. 300 mV

Bandpass Filter:

Center Frequencies :  30,60, 120, 240, 480, 960 Hz; 1,92; 3,84; 7,68; 15,36 kHz

Selectability:

11-position switch for selecting each of the 10 individual Bandpass Fiters, or All pass, for initial LED balancing.

Equalizer Section

Harmonic Distortion:  less than ,01% at 2 V

IM Distortion:  less than ,01% at 2 V

Signal-to-Noise Ratio: 

105 dB at 10 V output

100 dB at 2 V output

Octave Controls:

±16 dB boost or cut-each octave (all octaves set at max)

±12 dB boost or cut-each octave 9all octaves set at zero)

Gain Cut Capability:  +22 dB / -23 dB (all controls at maximum)

Zero gain Controls:  18 dB range

Filter Type:  Op-Amp synthesized inductors

Dimensions (W x H x D):  19" x 5-3/4" x 11-3/4"

Weight:  21 lbs

JVC SEA-80 equalizer

A new 10-band equalizer from JVC Corp can "tune your room" for audio reproduction of the highest quality. The equalizer utilizes a pink noise generator that simulates the response of the human ear; energy distribution is constant as the signal doubles between 100 Hz and 200 Hz ; for example. The SEA-80 is claimed to actually analyze a room's acoustic so that you can make exact compensations on each of the ten channels. A Fluorescent Spectrum Analyzer Display divides input into ten bands (corresponding to the center frequencies of the equalization controls) and displays the dB level of each on ten, bright fluorescent bars. An eleventh bar charts over-all volume. This visual graph of a room's acoustics ensures real equalization, says JVC. Each display bar is designed to rise rapidly and fall slowly to enhance the visual representation of what your ears actually hear. The display covers the frequency range from 32 Hz to 16,000 Hz over the range from "0" to 26 dB. The SEA-80's mode switch allows a graphic reading of either the left- or right channel signals alone, as well as both together. A memory feature allows holding an input indication for closer inspection. The unit is said to aid in control of high frequency signals when recording on cassette tapes.

 Specifications

Circuitry:

Buffer Amplifier:  FET-equiped, ICL-input, double-differential, equiphase-feedback circuit

S.E.A. Amplifier:  Double-differential input, DC configuration circuit

Semiconductor L Circuit:  Transistor-inductor circuit

Input Section Impedance:

SEA Input :  47 k Ω

Tape Mon. :  47 k Ω

Output Section Impedance:

SEA Output :  100 Ω

Tape Rec :  100 Ω

Rated Output:  2 V RMS (with all S.E.A. controls pos. At "0")

Total Harmonic Distortion:  0,003% (at 1 kHz rated output)

Intermodulation Distortion:  0,003%  (with all S.E.A. controls pos. At "0")

Gain:  0 dB with SEA switch Off; 0 dB with SEA switch On; -6 dB with SEA switch at -6 dB

Frequency Response :  10 - 100 kHz (+0 -2 dB)

Signal-to-Noise Ratio:  118 dB (at rated output IHF A-network short-circuit)

Control Section

SEA Center Frequencies:  31,5 Hz; 63 Hz; 125 Hz; 250 Hz; 500 Hz; 1 kHz; 2 kHz; 4 kHz; 8 kHz; 16 kHz

SEA Control Range:  ±12 dB

Pink Noise Section

Output ;  50 mV RMS

Microphone Amplifier

Matching Mic. Sensitivity:  more than -72 dB

Matching Mic. Impedance:  less than 1 k Ω

Mic. Attenuator;  -20 dB

Graphic Display Section

Mic. Switch at Off:  Indicates the level of signals leaving the SEA Output terminals

Mic. Switch at on or -20 dB:  Indicates the level of input signals to the microphone

Display Modes;  L; R; L + R; Off

Memory:  Normal display is restored a few seconds after the Memory switch is released to Off

General Section
Power Source:  AC 110 V / 120V / 220 V / 240 V (selectable) 50/60 Hz

Power Consumption:  26 W

Dimensions (W x H x D):  450 x 158 x 319

Weight:  8 kg

ADC Sound Shaper Three equalizer

ADC has four Sound Shaper frequency equalizers that will improve your sound system. No matter how good it is. And at a cost that's lots less than trading in your components.

ADC Sound Shaper will improve your speakers. By extending thr true bass response, including the critical mid bass. ADC Sound Shaper will improve the relationship between your cartridge and speakers. From one of partial incompatibility to total compatibility.

They'il also eliminate rumble (low frequency overload), tape hiss and record scratches. And that only scratches the surface of what ADC Sound Shapers can do. For instance, the walls, carpeting and furniture of your listening room physically bounce sound around so that some spots have less sound than other spots. Lots less. ADC Sound Shapes will bring these "dead" spots to life.

Perhaps best of all, though, is a Sound Shaper's ability to let you re-equalize what a recording engineer mixed. If a horn section is overwhelming a piccolo, for example, you just slide the appropriate frequency lever. Presto, more piccolo. You can also vanquish a voice. Or boost a tube. Sound Shapers segment the entire spectrum of sound. To let you re-shape a sound track to your personal musical preferences. It's all the control you've ever dreamed of but never dreamed possible.

To get into equalizers, start with our Sound Shaper One which operates in five frequency ranges. Or our Sound Shaper One Ten which gives you greater control by operating in ten frequency ranges.

For more professional equalizers, there's our Sound Shaper Two MkII which functions in twelve frequency ranges with a two-channel LED meter And there's our new Sound Shaper Three Paragraphic Equalizer.

It combines all the advantages of a graphic equalizer with all the advantages of a perametric equalizer. Twelve primary frequency controls per channel. Plus twenty-four ancillary control positions per channel. The Sound Shaper Three is the ultimate in controlling and creating with your stereo system.

Take the ultimate step up in sound, without trading in a thing.

How To Trade Up Your Receiver, Tuner, Amplifier, Turntable, Cartridge And Speakers Without Trading In A Thing

Kenwood GE-930 equalizer

Electronic 14-Band Graphic Equalizer/Spectrum Analyzer

14-Band graphic equalizer with ±12 dB variable range

Two fluorescent spectrum analyzer displays with level adjustor

10 equalizer memory presets (5 programmable, 5 built-in)

System remote controllable (effect memory)

Microphone mixing

Reverse mode

Kenwood GE-770

Stereo Graphic Equalizer with Spectrum Analyzer

10 bands

12 dB cut or boost per band

Independent L/R channel ad0justment with slide controls

EQ on/off switch for comparisons

Normal/Reverse switch acts as simple nooise reduction

10 band spectrum analyzer with large fluorescent display

L/R independent or L + R channel spectrum display

Easy operation with graphic display of status

Two tape channels with monitoring

Dimensions (W x H x D):  16-11/20" x 5-3/8" x 12-5/16"

Weight:  10,6 lbs (net)

Teac EQA-110

TEAC EQA-110

10-band equalization

±12 dB adjustable range

Independent L/R adjustment

Specifiactions:

Number of Channels:  2

Number of Bands:  10

Center Frequencies:  30, 60, 125, 250, 500, 1k,2k, 4k, 8k, 16 kHz

Boost/Cut Range:  ±12 dB

Inputs Nominal Level/Impedance:  0,3 V/47 k Ω

Outputs Max. Level/Impedance:  6,0 V/1 k Ω

Frequency Response:  10 - 100,000 Hz ±1 dB

Total Harmonic Distortion:  0,01%

Signal-to-Noise Ratio (IHF-A weighted):  90 dB

Dimensions (W x H x D):  435 x 83 x 213 mm

Weight:  2,5 kg

Teac EQA-220

TEAC EQA-220

Features:

10-band spectrum analyzer display

10-band equalization

±12 dB adjustable range

Specifiactions:

Number of Channels:  2

Number of Bands:  10

Center Frequencies:  30, 60, 125, 250, 500, 1k,2k, 4k, 8k, 16 kHz

Boost/Cut Range:  ±12 dB

Inputs Nominal Level/Impedance:  0,3 V/47 k Ω

Outputs Max. Level/Impedance:  6,0 V/1 k Ω

Frequency Response:  10 - 100,000 Hz ±1 dB

Total Harmonic Distortion:  0,01%

Signal-to-Noise Ratio (IHF-A weighted):  90 dB

Dimensions (W x H x D):  435 x 83 x 213 mm

Weight:  2,7 kg

Pioneer SG-9500 Equalizer

Unique Stereo Graphic Equalizer Pioneer SG-9500 for impeccable tonal control of any frequency response and sound field

Pioneer has created model SG-9500 so that you, the music listener,, can create the most ideal sound field by more delicately  and accurately controlling frequency response. Distinctively designed and finished, the SG-9500 work to complement the sound personalities of your stereo cartridge, microphone, tape equipment and speakers. In the broadest sense, the SG-9500 actually "hand-tailors" your music and its myriad tonal qualities to enhance your music-listening pleasure. The stere perfectionist. And we hope this is you. Could hardly ask for a more precise, more complete instrument to add the perfect finishing touches to his musical sound field.

Level Control with One Octave Cutoff, independent left and Right channels

The level control is cut off by one octave in 10 elements of 32 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz, and the left channel and right channel can be operated independently. The variable range of each element is ±10 dB

IC operation Amplifier

Unlike any other graphic equalizer, SG-9500 uses an Integrated Circuit instead of ordinary cils and capacitors. The IC contains 20 transistors and 2 diodes (x10 elements) and each IC operates as an active bandpass filter by negative feedback technology. This helps minimize distortion and contributes to expansion of dynamic range.

Multiple Reproduction and recording Techniques

By  combining the Tape Monitor Switch and Equalizer Switch , six different recording and reproducing methods can be accomplished without connecting or disconnecting the cords of the SG-9500. with the Equalizer SW switched off, the Equalizer  circuit is baypassed. Refeence to the wiring diagram reproduced on the unit's rear panel, adds to the convenient reproduction and recording possibilities of the SG-9500.

Pure FET-Equipped Electronic type Muting

A pure electronic type control muting circuit is employed in the SG-9500 with an FET in the output stage in series. This eliminates pop noises when power is switched on and off.

Professional. Distinctive Design

The SG-9500 is a beautifully designed instrument that will make a handsome addition to any existing stereo system. Its immaculate to efficient operation.

Specification

Equalizer range :  ±10 dB

Individual Channel Adjust:  32 Hz, 64 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz,

Total Harmonic Distortion (20 Hz to 20 kHz , all control Flat):

Output 1 V :  0,04%

1 kHz, all Control Max. Output 3 V :  0,04%

1 kHz, all Control Flat, output 2 V :  0,03%

1 kHz, all Control Min. Output 1 V :  0,05%

Insertion Loss:  0 dB (control flat)

Max Output Voltage:  6 V (1 kHz, T.H.D. 0,05% , RL 47 k Ω)}

Frequency Response:  5 Hz to 70 kHz =0 dB, -1 dB

Signal-to-Noise ratio:  90 dB (IHF, Short circuited, A network, 2 V output):

Input Impedance:  600 ohms

Semiconductors:

ICs :  14; FETs :  2; Transistors : 12 ; Diodes :  13

 power

Requirement :  120, 230 V 50/60 Hz

Consumption :  16 watts

Dimensions (W x H x D):  420 x 150 x 341 mm (16-1/2" x 5-7/8" x 13-7/16")

Weight:  6,9 kg (15 lb 3 oz) net

Technics SH-Z200

 Technics Stereo Graphic Equalizer SH-Z200

Features:

7-band at ±12 dB equalization for each channel

LED illuminated sliding knob

Low-noise and low-distortion electronic filter circuit

Equalizer On/Off switch

Specifications

Total Harmonic Distortion:  0,005% (20 - 20,000 Hz)

At 1 kHz :  0,003%

Signal-to-Noise Ratio:  100 dB (110 dB, IHF-A)

Frequency Response:  5 Hz - 100 kHz (-1 b)

Input Sensitivity/Impedance:  1 V/33 k Ω

Channel Balance:  ±0,5 dB (250 Hz - 6,3 kHz)

Channel Separation:  70 dB (1 kHz)

Band Level Controls:  ±12 dB (7 elements/channel)

Center Frequencies:  63 Hz; 160 Hz; 400 Hz; 1 kHz; 2,5 kHz; 6,3 kHz; 16 kHz

Power Supply:  240 V AC,50/60 Hz 

Power Consumption:  8 W

Dimensions (W x H x D):  430 x 86 x 234 mm

Weight:  2,4 kg

Denon DE-70

 Dynamic Sound processor Stereo Graphic Equalizer

Newly developed dnamic sound equalization circuitry with years of experience in the design and production of professional equipment.

Idependent twelve bands control for each channel.

A full array of functions ready for the era of taping.

Highly refined design sophistication.

Built-in an expander function for wide dynamic range.

Specifications

Frequency Response:  10 Hz - 200 kHz +0, -2,5 dB

Maximum Output Voltage:  8 V

Rated Output Voltage:  1 V

Total Harmonic Distprtion:  0,003%

Input Sensitivity:  1 V

Dynamic Range:  113 dB (1 kHz)

Input Impedance:  40 k Ω

Output Impedance:  800 Ω

Gain:  0 dB ±0,2 dB

Variable Range:  ±12 dB (max)

Center Frequency:  16; 31,5; 63; 125; 250; 500 Hz - 1; 2; 4; 8; 16; 32 kHz

Expander Function:  With On/Off functon, level control and peak indicator

Dynamic Function:  With On/Off function, level control and peak indicator

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

Power Consumption:  20 W

Dimensions (W x H x D):  432 x 132 x 300 mm

Weight:  6 kg

Product Year:  1983

JBL SG 520

 A perfectionist's instrument, featuring unparalleled flexibility of inputs, outputs, mixing, and professional linear actuated controls, the Graphic Controller offers the flatest frequency response, lowest distortion, lowest noise level and greatest operating convenience of any preamplifier. Additional controls, tape monitor switch and convenience inputs and outputs are located behind special hinged front panel.

 Special Features:

Professional linear-actuated controls allow precise adjustment and give instant visual recognition of exact settings. Illuminated push-buttons permit instantaneous switching from any function to any other function. Seledom-used controls are concealed behind a hinged lower panel, out of sight when not needed, yet directly accessible from the front.

Included in the secondary control bank are output level set controls, gain controls for both phono inputs, high frequency filter, low frequency filter, tape monitor witch, and an auxiliary "trim" balance control for the phono input. (Whit this, the residual unbalance in any particular pickup cartridge can be eliminated without disturbing normal settings for other program material) the hinged panel also conceals input and output jacks for convenient connection of temporary auxiliary equipment.

 Aural Null Stereo Balancing System

By adding the F22 remote relay (available as an accessory), the Graphic Controller becomes more than a fine stereo control center ,  it can be used as a sensitive instrument for balancing channels and checking the performance of your stereo component installation.

Specifications:

(All specifications are measured with AC line voltage of 117 volts at 60 cycles. Line voltage fluctuations between 105 and 127 volts do not affect the performance at the Graphic Controller.)

Output:  3 Volts (more than sufficient to drive a JBL Energizer or any conventional power amplifier)

Frequency Response:  Typical response is within ¼ dB through the entire audible range from 20 - 20,000 cps. (the smallest deviation which can be detected by the human ear is approximately one dB.)

Distortion (these are typical specifications under ambient temperatures which would normally be encountered in a home installation):

Total Harmonic Distortion  (at full rated output):  less than 0,15% at any frequency from 20 - 20,000 cps

Intermodulation Distortion:  less than 0,05% at 3 volts output

Hum and Noise:  1 mV or less referred to the low level phono input. From high level inputs, noise is 90 dB below rated output.

Gain: 

Low level inputs:  54 dB

High level inputs:  2 dB (require 0,3 volts for rated output)

Tone Controls:

Treble :  17 dB boost or cut at 20,000 cps

Bass :  21 dB boost or cut at 20 cps

Control Tracking Accuracy: 

Through their full range of operation, the linear actuated controls of the Sg-520 exhibit variations typically less than one decibel from laboratory specifications. This means that you enjoy the unlimited flexibility of continuously variable controls, yet with a degree of tracking accuracy normally obtainable only with individual calibrated switch-type attenuators.

Tempearature Stability:

The SG-520 is considerably less sensitive to temperature changes than ordinary transistorized preamplifiers. So long as sufficient ventilation is provided to keep air temperature in its immediate vicinity below 110° F, it can be left on indefinitely without affecting the quoted specifiactions.

Dimensions (W x H x D):  15-9/16" x 6-1/2" x 13"