The ARs which I use look like these:
Just the tops, I don't have the woofer "columns". The tops sound quite good by themselves, though they are a bit bass-shy, probably good down to 80-100 Hz by themselves, but then I'm not really into "thump" and "rumble" all that much, anyway Yellow_Light_Colorz_PDT_03 Yellow_Light_Colorz_PDT_06
These "top units" were used on the AR Holographic M5 and M6 series, the difference being that the M5 had a single 8 inch woofer, and the M6 has two. The "tops" are the same for both models. input connections are two female banana plug receptacles recessed in the bottom.
/ed B