Koss CM/1030 Rare Vintage Audiophile Speakers

Description

These are in very good all original one owner condition. The troublesome toggle switches were just replaced and they sound incredible. Only minor signs of age and use, the grills are nice and the cabinets built by" Colonial Manufacturing Company in Zeeland Michigan" are in very good unrestored condition. Please look closely at all the pictures for their exact condition.
Do to the size and being this nice and rare, I choose not to ship these, you are welcome to arrange your own shipping. At your cost and your liability.
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-order 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.
The cabinets were custom built by" Colonial Manufacturing Company in Zeeland Michigan"
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.