Audio Note makes a speaker that you can drive with as little as 3 watts. Ideally suited for SET amps. VERY musical. 95db 6-8 ohm. 8 nominal. Prices range from $3500 to $20,000. If you send me a e-mail I will be happy to e-mail you responses from customers who have heard them. Find a local dealer and listen to them. They are incredible. We have actually driven them with a 1.5 watt amp with good results allthough I recommend a little more.