Howland West CIS-4000 Headphones
Vintage 70s QUADROPHONIC headphones,Excellent condition.
This set is in excellent condition, and doesn't appear to have had much (if any) use at all.
The ear muffs, cord, head band and head band foam are in great condition. The headset has a 2 channel/4 channel selector switch and is comfortable despite the bulky appearance.
These have been tested using several stereo sources while applying a slightly delayed signal to the rear input. The effect is noticable, with an expanded field. It would be interesting to test them with true QUAD material.
No specifications were available at the time of this listing. A search indicated that Howland West Audio Products is now known as HW International.