Grog's correct, they are the larger speaker option for the GSS-100 head unit. Very Rare! Each cabinet contains two 12" woofers and a horn tweeter. I bought mine in 1967, played my Farfisa Compact Duo through it and loved it. It was the only amp I could find that gave me the oomph to compete with the guitars on stage. I think it was the horns that did it. My horns were labeled "Jensen Hypex". (I'm not sure if Jensen also made the 12" speakers). When home I used the speaker cabinets as stereo speakers for my Harman Kardon A50-K amplifier. Good find!
