Great sounding and good looking, these bookshelf speakers are in excellent condition and have a 6 inch mid-woofer and are bi-ampable if you have 2 amplifiers as power sources or 1 multi amp (like a home theatre amp with a Zone 2, etc.) Bi-amping means removing the 'bridge' on the back input plate and sending separate power to each of the mid-woofer and tweeter on each speaker. It really makes a difference to the quality of the sound. But they can also be used as bridged with one amp to very good effect.
Take your listening to the next level for a budget price!