What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





JVC TD-W303

Full-Logic Control Double-Mechanism Cassette Deck

Features:
Two tape transports, one for recording and playback and other for playback
Computer-controlled full-logic control
Auto DDRP
Continuous play of two tapes
High-speed editing with synchro dubbing
Dolby B/C noise reduction system
Auto tape selector
LED multi-peak level indicators
Auto/synchro rec mute
Headphone output

Specifications
Frequency Response at -20 VU:
Metal Tape :  30 - 16,000 Hz (40 - 15,000 Hz ±3 dB)
SA/Chrome Tape :  30 - 16,000 Hz (40 - 15,000 Hz ±3 dB)
Normal tape :  30 - 15,000 Hz (40 - 14,000 Hz ±3 dB)
Signal-to-Noise Ratio:  58 dB (Metal Tape)
Wow and Flutter:  0,08% (WRMS)
Crosstalk (at 1 kHz):  60 dB
Channel Separation (at 1 kHz):  40 dB
Total Harmonic Distortion:  1,0% (Metal tape)
Heads
Record/Playback :  Metaperm head (Deck A, B)
Erase :  Two-gap ferrite head
Input Sensitivity/ Impedance:
Line IN :  80 mV/ 50 k Ω
Output Level/ Impedance:
Line Out :  300 mV/ 5 k Ω
Headphones:  0,3 W/ 8 Ω
Dimensions (W x H x D):  435 x 123 x 288 mm ( 17-3/16" x 4-7/8" x 11-3/8")

Weight: 4,3 kg ( 9,5 lbs)

Onkyo TA-RW66


The TA-RW66 is a highly versatile double cassette deck with auto reverse, automatic tape selection and Onkyo's superbly engineered soft touch mechanism. Along with these single deck features the system offers a choice of dubbing at regular or high speed. So wheter you're recording from a broadcast, compact disc or other source, this double cassette system makes your recording foolproof and easy.

Two cassette transport and auto reverse.
The TA-RW66 is two cassette deck in one unit that allows you to enjoy all the recording and playback features of a single stereo cassette tape deck with the added convenience of a second tape transport system that makes dubbing and other tape editing tasks a breeze. Tape-1 has both recording and playback capabilities. Tape-2 is for playback only with auto reverse so the listener can set  the controls for playback of one side both sides of a tape

High and Normall Speed Dubbing
To save time, the TA-RW66 has a high speed dubbing function that cuts waiting time in half. When copying both sides of a C-60 cassette, for example, only 30 minutes is needed. A dubbing selection switch allows you to choose between normal or high sped dubbing.

Unitized Die-Cast Head Mount
Many audiophiles feel auto-reverse decks are inferior to uni-directional decks because of the small difference in sound quality between the forward and rverse tape transport directions. Whit the TA-RW66, however, this is no longer a problem. Onkyo guarantees virtually identical frequency response and other specifications in both directions by mounting the rec/pb and erase heads on a precision-made die-cast block with dual azimuth adjustment.

Automatic Tape Selection
With the automatic tape selection ystem in Cassette 2, the deck itself automatically detects the type of tape inserted and adjust the bias current accordingly. So guesswork and the chance of forgetting to adjust the bias setting and spoiling your recording are eliminated. Of course, Cassette 1 has  its own tape selector to allow dubbing of two different types of tape.

Specificaations
Track Format:  4-tracks, 2-channels
Erase System:  AC erase
FF and Rewind Time:  90 sec. (C-60)
Wow and Flutter:  0,07% (WRMS)
Frequency Response:
Metal Tape :  20 - 17,000 Hz (30 - 16,000 Hz ±3 dB)
High Position Tape :   20 - 16,000 Hz (30 - 15,000 Hz ±3 dB)
Normal tape :   20 - 15,000 Hz (30 - 14,000 Hz ±3 dB)
Signal-to-Noise Ratio:  58 dB (Metal, Dolby NR Out)
Inputs:
Line In Jacks :  2
Input Sensitivity :  60 mV
Input Impedance :  50 k Ω
Outputs:
Line Out Jacks :  2
Standard Output level :  500 mV ( 0 dB)
Optimum Load Impedance :  more than 50 k Ω
Headphone Jack : 1
Optimum Load Impedance :  8 - 200 Ω
Motors :  2 motor system DC servo motor x 2
Heads:
Rec/PB :  Special hard permalloy x 2
Erease :  Ferrite x 1
Power Supply Rating:
AC 120 V 60 Hz; AC 220 V 50 Hz; AC 240 V 50 Hz; AC 120/220 V switchable 50/60 Hz
Dimensions (W x H x D):  435 x 112 x 258 mm (17-1/8" x 4-3/4" x 10-1/8")

Weight:  5,3 kg (11,7 lbs)

Pioneer HPM-60

 Clearly Defined Image Projection from 60 watt. 4-way, 4-speaker Bass-reflex System with Carbon Fiber Blended Woofer and High Polymer Supertweeter.

When a speaker system as unusually well designed as the Pioneer HPM-60 goes to work, the meaning of musical "realism" is well beyond words. Pioneer's success with the unique woofer cone material called "Carbon Fiber Blend" is now well known throughout the high fidelity world, as is the Pioneer development of a High Polymer Supertweeter that ends narrow-beam tweeter directionality and assures a more natural, cleaner high-end reproduction. Both these remarkable innovations and more besides are included in the 4-way, 4-speaker HPM-60 system.
They contribute to very clearly defined sound image projection for the most realistic musical reproduction Pioneer's technical knowhow has yet achieved in such a compact, attractively priced system.

Special features, level Controls.
Individual controls are provided for the Mid and High frequency ranges, and when set at "0" a suggested output characteristic is obtained. Turning either control clockwise  increases the output from that speaker, while turning fully counter clockwise reduces the output to zero.
Specifications
Enclosure:  book-shelf style, Bass-reflex type
System:  4-speaker, 4-way
Loudspeakers:
Woofer :  250 mm (10") cone type, carbonfiber cone
Mid-range :  100 mm (4") cone type
Tweeter :  45 mm (1-3/4") cone type
Super tweeter :  High-polymer type
Nominal Impedance:  8 Ω
Frequency Range:  35 - 25,000 Hz
Sensitivity:  92,5 dB/1W/1m
Maximum Input Power:  60 W
Rated Input Power:  30 W
Crossover Frequency:  3,000 Hz, 4,000 Hz, 12,000 Hz
External Dimensions (W x H x D):  350 x 610 x 321 mm ( 13-25/32" x 24" x 12-5/8")
Weight:  17,5 kg (38 lb 8 oz)


Yamaha CT-400 tuner


Yamaha CT400
High-performance FM/AM stereo tuner featuring output level control, noise-cutting Blend control and clean, simplicity styling.

Make the move to uncompromising component performance - without expensive extra frills.
The CT-400 offers years of clear, low-distortion AM and FM stereo reception to blend with the finest audio system. At the same time it's a masterpiece of no-fuss operation and clean decorator styling.

Sensitivity. This is the ability to pull in signals-  even weak ones. The CT-400's superb 2,0 µV (IHF) sensitivity comes from an FET-equipped FM front end, a type usually reserved for the most expensive equipment.
 Selectivity. The CT-400 easily homes in on the station you tune, excluding nearby interference with an outstanding 75 dB selectivity. This is assured by an FM IF stage incorporating no less than six special ceramic filters.
 Separation. The CT-400's clear, rich FM stereo depth is provided by an excellent 40 dB (400 Hz) stereo channel separation. The secret is a unique balanced differential type multiplex demodulator featuring integrated circuitry.

Specifications
FM Tuner Section
Usable Sensitivity:  2,0 µV
Image Response Ratio (84 MHz):  55 dB
IF Response Ratio (84 MHz):  75 dB
Spurious Response Ratio (84 MHz):  75 dB
Capture Ratio:  1,5 dB
Effective Selectivity (IHF):  75 dB
Signal-to-Noise Ratio:
Mono :  70 dB
Stereo :  66 dB
Total Harmonic Distortion (400 Hz):
Mono :  0,3%
Stereo:  0,5%
Stereo Separation (400 Hz):  40 dB
Frequency Response:  20 Hz to 14 kHz, +1,5 dB, -3 dB
Subcarrier Suppression Ratio:  40 dB
AM Tuner Section
Usable Sensitivity (IHF, bar antenna):  52 dB/m
Selectivity (1000 kHz):  25 dB
General Section
Power Supply:  AC 100-120V, 220-240V, 50/60 Hz
Power Consumption:  2,6 W (100V)
Dimensions (W x H x D):  436 x 144 x 300 mm
Weight:  5,0 kg

Marantz RS 3559


Marantz Century series receivers reach new heights of flexibility and capability in home entertainment components. These multi-mode receivers can reproduce stereo music with subtle, delicate realism. With the transparency that Marantz is so well known for. Yet they can do far more.
All three Century receivers feature system remote control, four power amplifiers ( five on RS-3559), high-current amplifier design, oversized power transformers, illuminated alphanumeric display centers, station name display, preset scan, and are compatible with future standards for residential BUS remote control systems. And the RS-3359 features video sharpness control and video dubbing;
Superscope FX sound, which brings to the home music listening and theatre experiences a highly effective combination of technologies Dolby Surround Pro Logic with its highly effective logic steering, rear effects channels, and center dialogue channel. Digital delay to create a feeling of environmental spaciousness. Subwoofer capability to provide a solid foundation to the sound. And side-fill channels, for a heigh tened sense of realism.

The RS-3559 is equipped with Marantz unique Thermal tunnel, that keeps the receiver sounding open and transparent at all power levels. In traditional power amplifier designs, sound deteriorates when output transistors heat beyond their efficient thermal operating range. With standard technology heat  sinks cannot dissipate heat as fast as transitor temperatures rise under high power conditions. The thermal tunnel solves this problem by using assisted convection cooling under thermostatic control. At low power levels the thermal tunnel functions as a normal heat sink. As power dissipation rises, the thermal feedback system informs the master control circuitry, which operates a low-speed high-volume air circulator to accelerate cooling within the tunnel. As temperature rises, the circulation speed increases, keeping the output transistors in their ideal thermal range, for lowest distortion under all conditions.
The new Century series receivers Complete. Sophisticated. Flexible. Elegant transparent sound that's picture perfect.

RS-3559 Features:
Alphanumeric information center simplifies receiver operation, displaying key operating modes and information at all times.
CD Direct switch instantly bypasses signal processing circuitry for maximu signal purity with compact discs.
Preset scan lets you sample up to 30 stations, each for a few seconds.
Available in black or gold finish with rosewood side pnels.
Five independent power amplifiers, Superscope FX sound system featuring Dolby ProLogic
Patented thermal tunnel technology combines with industrial-grade oversized power transformer for high current capability.
Acoustic variable Space Enhanement digital delay system for concert hall realism.
64-key remote control for fingertip operation of major functions of receiver and other Century Collection components.
Can memorize up to 30 tuner preset stations in three multiscan banks.
Multi scan tuner library permits presets to be grouped, recalled, and scanned in three individual groups, so each member of the family can have individualized station memories.
Three video inputs, each with composite video plus stereo audio or RF input.

Electronically calibrated precision tone controls adjust bass, midrange, treble.

Specifications RS-3559
Rated Power Output (minimum contiuous watts/channel, from 2 Hz to 20 kHz, both channel driven into 8 Ω):  125 W
Total Harmonic Distortion (at rated power, from 20 Hz to 20 kHz):  0,02%
Intermodulation Distortion (at rated power):  0,02%
Rear Channel Output Power:  20 W
Center Channel Output Power:  20 W
Phono Preamplifier:
Frequency Response, RIAA Deviation, (from 20 Hz to 20 kHz):  ±0,5 dB
Signal-to-Noise Ratio:  75 dB (A-weighted)
Input Sensitivity (for rated power):  2,5 mV
High Level Inputs:
Frequency Response (from 20 Hz to 70 kHz):  +1 dB, -3 dB
Signal-to-Noise Ratio:  95 dB (A-weighted)
Input Sensitivity
For Rated Output Power, except CD:  150 mV
For Rated Output Power, for CD:  200 mV
Tone Controls at 100 Hz and 10 kHz:  ±8 dB
FM Section
Usable Sensitivity Mono:  11,2 dBf
50 dB Quieting [Mono/Stereo]:  12/38 dBf
Signal-to-Noise Ratio at 65 dBf [Mono/Stereo]:  76/70 dBf
Total Harmonic Distortion at 65 dBf, 1000 Hz [Mono/Stereo]:  0,15 / 0,3%
Stereo Separation, at 1000 Hz:  45 dB
Capture Ratio:  1,5 dB
Frequency Response  (from 30 Hz to 15 kHz):  1 dB - 3 dB
AM Section
Usable Sensitivty:  55 dB/m
Signal-to-Noise  Ratio:  45 dB
Image Rejection:  40 dB
Selectivity:  20 dB
Dimensions (W x H x D):  16-15/16" x 16-5/8" x 5-15/16"
Weight:  32,71 lbs

Marantz SR-3557

RS-3557 Features:
Alphanumeric information center simplifies receiver operation, displaying key operating modes and information at all times.
CD Direct switch instantly bypasses signal processing circuitry for maximu signal purity with compact discs.
Preset scan lets you sample up to 30 stations, each for a few seconds.
Available in black or gold finish with rosewood side pnels.
Four independent power amplifiers,
Superscope FX sound system featuring Dolby ProLogic
44-key remote control for fingertip operation of major functions of receiver and other Century Collection components.
Can memorize up to 30 tuner preset stations in three multiscan banks.
Multi scan tuner library permits presets to be grouped, recalled, and scanned in three individual groups, so each member of the family can have individualized station memories.
Two video inputs, each with composite video plus stereo audio or RF input.
Electronically calibrated precision tone controls adjust bass, midrange, treble.


Specifications RS-3557
Rated Power Output (minimum contiuous watts/channel, from 2 Hz to 20 kHz, both channel driven into 8 Ω):  100 W
Total Harmonic Distortion (at rated power, from 20 Hz to 20 kHz):  0,03%
Intermodulation Distortion (at rated power):  0,03%
Rear Channel Output Power:  20 W
Phono Preamplifier:
Frequency Response, RIAA Deviation, (from 20 Hz to 20 kHz):  ±0,5 dB
Signal-to-Noise Ratio:  75 dB (A-weighted)
Input Sensitivity (for rated power):  2,5 mV
High Level Inputs:
Frequency Response (from 20 Hz to 70 kHz):  +1 dB, -3 dB
Signal-to-Noise Ratio:  95 dB (A-weighted)
Input Sensitivity
For Rated Output Power, except CD:  150 mV
For Rated Output Power, for CD:  200 mV
Tone Controls at 100 Hz and 10 kHz:  ±8 dB
FM Section
Usable Sensitivity Mono:  11,2 dBf
50 dB Quieting [Mono/Stereo]:  12/38 dBf
Signal-to-Noise Ratio at 65 dBf [Mono/Stereo]:  76/70 dBf
Total Harmonic Distortion at 65 dBf, 1000 Hz [Mono/Stereo]:  0,15 / 0,3%
Stereo Separation, at 1000 Hz:  45 dB
Capture Ratio:  1,5 dB
Frequency Response  (from 30 Hz to 15 kHz):  1 dB - 3 dB
AM Section
Usable Sensitivty:  55 dB/m
Signal-to-Noise  Ratio:  45 dB
Image Rejection:  40 dB
Selectivity:  20 dB
Dimensions (W x H x D):  16-15/16" x 16-5/8" x 5-15/16"
Weight:  32,21 lbs

Marantz SR-3555

 Marantz Century eries Receivers reach new heights of flexibility and capability in home entertainment components.

RS-3555 Features:
Alphanumeric information center simplifies receiver operation, displaying key operating modes and information at all times.
CD Direct switch instantly bypasses signal processing circuitry for maximu signal purity with compact discs.
Preset scan lets you sample up to 30 stations, each for a few seconds.
Available in black or gold finish with rosewood side pnels.
Four independent power amplifiers,
Active surround sound system.
36-key remote control for fingertip operation of major functions of receiver and other Century Collection components.
One video inputs, each with composite video plus stereo audio or RF input.

Electronically calibrated precision tone controls adjust bass, midrange, treble.

Specifications RS-3555
Rated Power Output (minimum contiuous watts/channel, from 2 Hz to 20 kHz, both channel driven into 8 Ω):  50 W
Total Harmonic Distortion (at rated power, from 20 Hz to 20 kHz):  0,04%
Intermodulation Distortion (at rated power):  0,04%
Rear Channel Output Power:  20 W
Phono Preamplifier:
Frequency Response, RIAA Deviation, (from 20 Hz to 20 kHz):  ±0,5 dB
Signal-to-Noise Ratio:  75 dB (A-weighted)
Input Sensitivity (for rated power):  2,5 mV
High Level Inputs:
Frequency Response (from 20 Hz to 70 kHz):  +1 dB, -3 dB
Signal-to-Noise Ratio:  95 dB (A-weighted)
Input Sensitivity
For Rated Output Power, except CD:  150 mV
For Rated Output Power, for CD:  200 mV
Tone Controls at 100 Hz and 10 kHz:  ±8 dB
FM Section
Usable Sensitivity Mono:  11,2 dBf
50 dB Quieting [Mono/Stereo]:  12/38 dBf
Signal-to-Noise Ratio at 65 dBf [Mono/Stereo]:  76/70 dBf
Total Harmonic Distortion at 65 dBf, 1000 Hz [Mono/Stereo]:  0,15 / 0,3%
Stereo Separation, at 1000 Hz:  45 dB
Capture Ratio:  1,5 dB
Frequency Response  (from 30 Hz to 15 kHz):  1 dB - 3 dB
AM Section
Usable Sensitivty:  55 dB/m
Signal-to-Noise  Ratio:  45 dB
Image Rejection:  40 dB
Selectivity:  20 dB
Dimensions (W x H x D):  16-15/16" x 16-5/8" x 5-15/16"
Weight:  28,71 lbs


Technics SU-800

SU-800 Stereo Integrated Amplifier
Features:
New Class A circuitry for clear, undistorted sound;
40 W x 2 RMS (20 Hz - 20 kHz at 8 Ω);
Light-touch input selectors include phono,tuner, CD/Aux and tape 1 and tape 2;
Quiet EQ circuitry;
Two tape monitors with editing capability
Main and/or remote speaker selection
Heavy-duty aluminium front panel;

Only black finish available
Specifications:
Contiuous Power Output per Channel:
40 W :  20 Hz - 20 kHz at 8 Ω, (Total Harmonic Distortion 0,06%)
60 W :  1khz DIN at 8 Ω
Input Sensitivity/Impedance:
Phono MM :  2,5 mV/47 k Ω
Tuner, CD, Aux, Tape :  150 mV/22 k Ω
Frequency Response:
Phono :  RIAA ±0,8 dB
Tuner, CD, Aux, Tape :  5 Hz -90 kHz (-3 dB)
Signal-to-Noise Ratio:
Phono :  71 dB (72 dB IHF-A)
Tuner, CD, Aux, Tape :  90 dB (98 dB IHF-A)
Power Supply/ Consumption:  240 V 50/60 Hz ; 340 W
Dimensions (W x H x D):  430 97 x 240 mm
Weight:  5,8 kg


Technics SU-600


SU-600 Stereo Integrated Amplifier
Features:
New Class A circuitry for clear, undistorted sound;
30 W x 2 RMS (20 Hz - 20 kHz at 8 Ω);
Light-touch input selectors include phono,tuner, CD/Aux and tape;
Quiet EQ circuitry;
Main and/or remote speaker selection
Heavy-duty aluminium front panel;
Two finish available, Black or Silver

Specifications:
Contiuous Power Output per Channel:
30 W :  20 Hz - 20 kHz at 8 Ω, (Total Harmonic Distortion 0,07%)
50 W :  1khz DIN at 8 Ω
Input Sensitivity/Impedance:
Phono MM :  2,5 mV/47 k Ω
Tuner, CD, Aux, Tape :  150 mV/22 k Ω
Frequency Response:
Phono :  RIAA ±0,8 dB
Tuner, CD, Aux, Tape :  5 Hz -70 kHz (-3 dB)
Signal-to-Noise Ratio:
Phono :  71 dB (72 dB IHF-A)
Tuner, CD, Aux, Tape :  90 dB (98 dB IHF-A)
Power Supply/ Consumption:  240 V 50/60 Hz ; 250 W
Dimensions (W x H x D):  430 97 x 240 mm
Weight:  5,0 kg

Jensen Optimum Performance Concept


Many years ago, Jensen sound engineers went to work on a whole new concept in speaker design, OPC , the Optimum Performance Concept. It was based on one simple idea. That each part of a speaker system should be designed to help reproduce sound the way it was recorded. The same highs and lows. The same midranges. In all directions.
After five years of development, this concept has become a reality with Jensen's all-new OPC high fidelity line. It's been a long wait. But when you hear them, you'll know it's been worth it.

OPC means distortion-free bass response
Other speaker manufactures use cloth to connect the outer edge of a speaker cone to the speaker frame. We use exclusive Flexair foam suspension on every OPC speaker system for less restricted cone movement.

OPC means truer midranges
OPC speaker systems come with tuned isolation chambers. They're specially designed to smooth out midrange response and eliminate distortion resulting from mingling of frequencies in the speaker cabinet.

OPC means improved high frequency response
Our unique Sonodome tweeter disperses sound at a wide 170° angle to fill a room with brilliant highs… highs you're not used to hearing in home speakers of comparable price.

OPC  means functional design features
A specially designed bronzed-tinted dust cover shields and protects the optimum performance conrols. It is easily removed for ready access to the control panel and locks quickly back into place.
OPC means sound control
Not everyone likes to hear sound the same way. That's why we put optimum performance controls on the front of every OPC speaker system. These allow you to adjust the volume of bass, mid-range and hih frequencies without altering the sound itself. Each control is color keyed to speaker system components for esy reference (blue/bass; yellow/midrange; red/high frequency).


OPC means greater driving force
Instead of the metal magnets used by many other speaker manufacturers, we used super-powerful Syntox-6 magnets for greater activation of voice coils.
OPC means longer life
We're so pround of the way we built thase new jensens that we offer a full 5 year warranty. If anything goes wrong with your jensen OPC speaker, we'll fix it free of charge (including parts, labor and all shipping costs)
OPC means improved music blend
For true sound reproduction, a speaker must divide sound from an amplifier into high, low and midrange frequencies. Jensen found a way to do this better than anyone else. The CompTrac crossover network. It's computer-designed to more efficiently divide and channel sound

OPC means a whole different kind of speaker system
Be sure and see the new Jensen OPC speakers for yourself. You'll agree - they 're a revolution in sound.

Jensen OPC Model 25


Model 25
The Model 25 is designed for the music lover who appreciates the finest in sound.
Chack the features of this four speaker, three-way system for yourself. Large 15" Flexair woofer with a powerful 25 oz. Syntox-6 ceramic magnet. Two 3" cone midranges. 1-1/2" Sonodome tweeter. Comptrac crossover network. They combine to provide maximum frequency range and sound realism you've got to hear for yourself.
Model 25 has two optimum performance controls to allow you to adjust music to any listening environment.
We didn't forget beauty. Model 25 has a stylish hardwood cabinet with two-tone grill and dust cover.

Specifications:
Power Minimum/Maximum:  10 watts / 90 watts
Woofer:  15" Flexair
Midrange:  Two 3" cone-tuned isolation chamber
Tweeter: 1-1/2" Sonodome
Frequency Range:  20 - 25,000 Hz
Impedance:  8 Ω nominal
Crossover:  1000/5000 Hz
Dispersion:  180°
Tweeter Control:  Front-mounted
Midrange Control:  Front-mounted
Connections:  Kwik-on® push-type binding posts
Cabinet:  hardwood walnut veneer on wood products
Dimensions (H x W x D):  31 x 18-3/4 x 15-3/4 inches
Weight (shipping):  70 lbs

Pioneer SE-L20


Light, extremely compact open-air type stereo headphones featuring high molecular film diaphragm.

Can a set of stereo headphones weighing a more 205 grams (less than eight ounces) provide the same natural feeling you experience when listening to a conventional stereo speaker system? Pioneer says the answer is yes - and proves it with the introduction of the SE-l20 headphones. These light, highly compact headphones feature a Pioneer innovation - specially designed high molecular film diaphragm which is used in the 1½-inch dynamic speakers. The sound is natural, the response in the treble range is especially excellent, the bass response is rich and powerful. And thanks to a whole new brand of headphone technology, you'll enjoy long hours of fatigue free listening with the SE-L20. in fact, you'll hardly know you're wearing them.

Improved Open-Air Design
The design of the SE-L20 headphones is completely new . The back of each headphone unit is open so that the ear is not completely enclosed as with conventional type headphones. The result of this design is an extraordinary wide dispersion of sound, rare for headphones and not unlike the same natural feeling of listening to an ordinary speaker system.

Specifications:
Matching Impedance: 4 to 16 Ω
Maximum Input Power:  0,5 V
Frequency Range:  20 to 20,000 Hz
Sensitivity:  97 dB/0,1V
Driver Unit:   38 mm (1½") dynamic speaker
Weight:  205 g (7,2 oz) without connecting cable
Connecting Cable:  2,5 m (8,2 feet)