I have a pair of '81 Heresy's that work well with my Decware Zen amp. Because the speakers are effecient enough for the amp I can acheive ample sound levels without clipping the amp. The sound is very detailed but is lacking some bass. I'm experimenting with different wires to acquire the sound I like but overall I'm very satisfied. By the way, if anybody is interested I found a pair of LaSacalas for sale in the newspaper. The owner says they are in good shape and is asking $700.00. E-mail me for his phone #. Denver, CO area