Koss CM-1030 loudspeakers

 

 

The Koss CM/1030 represents the culmination of theory, technology and engineering experience in loudspeaker design. First, Koss engineers set the parameters for frequency response, efficiency and cabinet size. From these initial specifications, the Koss Theory developed specific design characteristics that include a 10-inch woofer, a mass aligned dual port system,, a parallel midrange system, and both a tweeter and treble tweeter that feature a unique acoustic transformer. And to mesh the system into an unbelievably beautiful entity, the CM/1030 uses a quasi second-orede crossover network. Once you've heard the Koss CM/1030 , we think you'll agree that no 4 bandpass system available today even comes close in performance.

 

Although much has been attributed to the speed and efficiency of the modern computer, there is little that any computer can accomplish without first having the specific scientific equations and data necessary to achieve specified goals. In the case of the new Koss CM loudspeaker systems, the modern computer allowed Koss engineers to perform the massive and complex audio engineering calculations required in using network synthesis to establish the engineering parameters for all CM systems.

Nevertheless, whereas the computer may have simplified the workload, it was still the genius of electrical and audio engineers and even, in the case of the cabinet designs, the brilliance of structural engineers, that made this remarkable new generation of loudspeaker systems possible.

 

Specifications

Bandpass Response (to typify the normal listening room situation):

Low Frequency ;  3 dB down point 29 Hz

High Frequency :  3 dB down point 19 kHz

Overall System Response :  6 dB down point 26 Hz to 19,5 kHz

Polar Response:  -3 dB (at 8 kHz);  -6 dB (at 10 kHz)

Intermodulation Distortion Products:  less than 0,1%

Reference Sensitivity:  94 dB SPL

Recommended Amplified Power Rating (8 ohm):  15 watts/channel (minimum); 200 watts/channel (maximum)

Impedance:  5 Ω (nominal), 4 Ω (minimum)

Input Power Overload Protection:  Fused 3 AG 3 A

Dimensions (W x D x H):  16-1/2" x 14-1/2" x 38-7/8"

Weight:  74 lbs

Koss CM-1020 loudspeakers

Utilizing the Koss Theory of loudspeaker design and its computerized program, Koss engineers set out to design the optimum 3 bandpass loudspeaker. The result is a system that stands alone in delivering a high energy broadband response, a low distortion product, and a high efficiency level. The CM/1020 utilizes a dual port design to achieve proper cabinet tuning and greater structural stability. The specially-designed 10-inch woofer provides both a 3 dB gain in electrical efficiency as well as a flat response over the low bandpass. The 4½ inch midrange driver and 1-inch dome tweeter capture all the realism of your music without distortion. And to unite all these outstanding elements, Koss utilizes a unique, seamless crossover network. But no description can match the thrill of hearing the CM/1020 in a live demonstration.

Specifications

Bandpass Response (to typify the normal listening room situation):

Low Frequency ;  3 dB down point 31 Hz

High Frequency :  3 dB down point 18,5 kHz

Overall System Response :  6 dB down point 27,5 Hz to 19 kHz

Polar Response:  -3 dB (at 8 kHz);  -6 dB (at 10 kHz)

Intermodulation Distortion Products:  less than 1,5%

Reference Sensitivity:  93 dB SPL

Recommended Amplified Power Rating (8 ohm):  15 watts/channel (minimum); 150 watts/channel (maximum)

Impedance:  5 Ω (nominal), 4 Ω (minimum)

Input Power Overload Protection:  Fused 3 AG 2½ A

Dimensions (W x D x H):  15-1/2" x 13-3/4" x 33"

Weight:  60 lbs

Koss CM-530 loudspeakers

Bookshelf speakers with the perfect mirror-image sound

Here is truly a remarkable achievement in loudspeaker design and performance. The Koss CM/530 bookshelf loudspeaker sets an entirely new standard in extended bandwidth response, high efficiency, low distortion and perfect mirror-image for speakers in its size and price range and within today's technological capabilities.

By designing a left and a right channel configurationfor the passive radiaator, the woofer and the tweeter, Koss engineers have created a perfectly matched set of bookshelf speakers that can be placed horizontally or vertically without losing the perfect right to left imaging, an incredible degree of dispersion and the beautiful sound of Koss.

To create the breathtaking depth and clarity in the CM/530, Koss engineers used an 8-inch passive radiator to radiate the sound energy over the lower two octaves. This allowed them to use an 8-inch woofer to reproduce the critical sounds in the midrange up to 3,000 Hz. In addition, the CM/530's 1-inch dome tweeter reproduces an exceptionally flat energy output and unusually low distortion that provides for a transparency and liveliness not found in other competitive speakers.

The Koss CM/530's also offer an unmatched increase in dynamic range over competitive bookshelf speakers. Due to the CM/530's higher efficiency and lower distortion, you can hear the higher sound pressure levels without clipping and also hear the lowest bass with a dramatic clarity as well. And to help you shape the extra sound you'll hear, there's a 3-position Tweeter level Control switch on each speaker that allows you to alter the tweeter frequency spectrum from a flat response to ±3 dB.

Specifications

Type: 2-way system, Passive-membran

Frequency Response:  36 - 17,00 Hz -3 dB

Impedance:  40hm min.

Sensitivity:  88 dB

Power Handling:  15 watts (min.) 75 watts (max.)

Dimensions (W x H x D):  349 x 609 x 298 mm

Weight:  15,8 kg

Koss CM-1010 loudspeaker

No other 2 bandbass speaker system can match the CM/1010's extended bandwidth response, high efficiency and unbelievably low distortion performance. And that's true at any size and at any price range. Once you've heard the unequaled Sound of koss in the CM/1010 you'll know for certain that our computerized Koss theory helped to make the optimum 2 bandpass speaker a reality. The CM/1010's unique passive radiator enhances the lower two octaves of the bass and allows for the use of a specially-designed 8-inch woofer to reproduce the critical midrange. A high-energy 1-inch dome tweeter produces the high-est energy output and lowest distortion of aany tweeter currently available. And an exclusive crossover network adds the finishing touches to the finest 2 band-pass loudspeaker system available today.

Specifications

Component Array: 

10" mass aligned acoustic filter (passive radiator)

8" parameter synthesized woofer

1" acoustically loaded dome tweeter

Bandpass Response (to typify the normal listening room situation):

Low frequency 3 dB down point.

Alignment mass in 35 Hz.

Alignment mass out 42 Hz

High frequency 3 dB down point 17,5 kHz

Overall system response for 6 dB down points 32 Hz to 18,5 kHz mass in 39 Hz to 18,5 kHz mass out

Polar Response:  -3 dB at 8 kHz;  -6 dB at 10 kHz

Intermodulation Distortion products:  less than 2%

Reference Sensitivity:  90 dB SPL

Recommended Amplifier Power Rating (8 Ω):  15 watts/channel (minimum); 100 watts/channel (maximum)

Crossover Network:  3500 Hz

Impedance:

Nominal :  6 Ω

Minimum :  4 Ω

Input power Overload Protection:  Fused 3 AG 2A

Dimensions (W x D x H):  15-1/2" x 11" x 28"

Weight (Net):  44 lbs

Koss ESP-9

 Koss ESP-9 Electrostatic Studio Monitor

Offers a new tool for improved audiometry with self-bias or ac line energizing. Controlled monitoring with 1 octaves ±2 dB range exceeding best loudspeaker systems.  Eliminates all room reflections and polar distribution problems.

 Super wide-range response -  for critical, controlled monitoring of finest recording sources. Delivers all 10 audible octaves, 10 - 19,000 Hz (±5 dB), 4 octaves beyond ordinary headphones.

Virtually distortion-free performance -  precision electrical balancing of push-pull acoustical circuitry to give fatigue-free listening through long, intense recording sessions. Elements cancel all 2nd harmonic distortion, unlike conventional units.

Lightweight - human engineered for comfort - uses fluid-filled cushions for good, comfortable seal; extendable stainless steel headband with wide cushion for perfect fit and restful listening.

Calibrated, precisely controlled output - ideal for audiometric uses - switch on front panel of energizer selects ac operation for precision measurements of output; in self-energized switch position no connection to ac lines is required; this gives maximum convenience.

 High-power capability in very low bass range - lerge, oversize coupling transformers mounted in external E-9 energizer unit give good wave form at 30 Hz with up to 10 volts input.

No special amplifiers required - low efficiency, connects to low-impedance speaker terminals - easy, quic hook-up to any rated high-quality amplifier delivers performance to specification. Excellent for evaluating the spectral character of very low level noise in equipment like tape mastering machines and recording consoles. In contrast to the ESP-6 and ESP-7, both cups are independently energized; al. Eft cup signal in not required to supply bias to the right cup.

 E-9 Energizer:  Contains 2 coupling transformers, self-energizing circuitry, speaker/headphone transfer key-switch and ac pilot light on black anodized front panel Also contains ac power transformers, ac on-off switch, ac line fuse, and speaker terminals.  Has 6'4" conductor input cable terminated with 4 spade lugs to connect to amp. output terminals.

Size:  4 ½ H x 3 ¾ W x 6 ¼ D inches

Weight:  3 pounds

Specifications

Electrical

Frequency Response Range, Typical:  15 -15,000 Hz ±2 dB (10 octaves) 10 - 19,000 Hz ±5 dB

Sensitivity:  80 dB SPL at 1 kHz ±1 dB reffered to 0,0002 dynes/cm² with 1 volt at the input

Total Harmonic Distortion:  less than 2% at 110 dB SPL

Isolation from External Noise:  40 dB average through fluid-filled cushions

Power Handling Capability:  Max. Continous program material should not exceed 10 volts (12 watts) as read by an ac VTVM (Ballantine meter 310B or equal) with average indicating circuitry and rms calibrated scale, provides for transient peaks 14 dB beyond the continuous level of 10 volts

Source impedance: Designed to work from 4 to 16 Ω amplifier outputs

External Power Requirements:  None, except when external ac line is selected on front panel switch of the E-9 Energizer (1/16 amp. 117 VAC, 50/60 Hz normally; 234 VAC with internal strap for foreign use)

Physical

Size of Cup:  4 ¼" H x 3 ¾" W x 1 ¼" D

Cushions:  Fluid-filled for high ambient noise isolation

Headband:  Extendable stainless steel bands with self-adjusting pivoting yokes; conforms to any head size

Boom Mount for Microphone:  Knurled, anodized aluminum knob on left cup with threaded shaft and 2 compressible rubber washers; accepts all standard booms

Headset Cable:  Flexible, polyvininyl, 5 conductor shielded. 6" long, black with 5 prong plug keyrd to E-9 Energizer receptacle

Weight of Headset Only:  19 ounces

Accessory provided:  6" ac line-cord P.N 41-0235 for optional use

Koss ESP-6

 Koss model ESP-6 Electrostatic stereophones

Break through in design gives distortion free, wide-range frequency response. Never before possible in headphones.

 3 octaves of sound beyond the limits of ordinary coil and cone type driver elements - this wide range is reachable only through electrostatic.

World's first Self-Energized Electrostatics - easy to use you just plug-in like other headphones. No special amplifiers or power supplies needed.

Virtually Distortion-free, because of push-pull operation, Elements cancel all 2nd harmonic distortion, unlike ordinary units. Square waves can be reproduced for the first time by an electro-acoustic-reproducer.

Dynamic level Indicators give measure of level - flicer at 10th row full orchestral volume, stay lit at very high levels.

Calibrated Machine-Run Frequency response, Chart with each headset - positive guarantee that the headset you buy meets specifications.

Cleaner, Wider range response than the best loudspeaker system yet producer - for the first time you hear what really comes out of the tape machine, disc reproducer, radio-tuner or microphone.

 Through the development of the world's first self-energized and self-contained electrostatic headphones, a true breakthrough in wide-frequency response-range and low distortion has been achieved  by Koss physicists and scientists.   Reproduces 9 of 10 audible octaves. This wide range is reachable only through electrostatic stereophones. Exceeding performance of the best loudspeaker systems now available, you get a critical monitoring facility that tells you exactly what comes out of professional recording or monitoring equipment.  A new era in personal listening is now available to the discriminating  music-lover at 10% of the price of the finest loudspeakers, you get sound as originally recorded, without lost stereo from wall and ceiling reflections. Spurious room resonances are banished because of the controlled listening environment tailored exactly to the human ear.

Frequency response is 30 to 19,000 Hz (±5 dB). Model ESP-6 complete with 10' coiled cord and connector box T-3.

Koss T-3

Speaker - headphone transfer switch

The T-3 is designed to provide a means of switching from stereo speakers to Stereophones. It is connected to the speaker terminals of the amplifier or receiver. The T-3 should be used when the headphone jacks on the amplifier or receiver has high value resistors in series with it. These violently alter the normal 8 Ω impedance upward. The high impedance which results prevents high quality, low impedance headphones from delivering wide range performance.

The T-3 can be used with any amplifier having 4, 8 or 16 Ω output taps.