Try to find the D-70 (8" drivers) or D-80 (10" drivers). This line was replaced by the Saturn line, in my opinion because it was almost identical to the (twice the price) D-500 and D-700. Same drivers, same crossovers, just not ported, and the cabinets are few inches shorter. I run the D-70's with a Mesa Baron amplifier, in full Triode mode with Zero Negative feedback, which is about 100 watts per channel (tri-Tube model with 12 EL34's), and must disagree with "Gotog". They're 91db efficient, and I can NOT turn my preamp above 1/2 way, EVER. Infact, 1/3 is about the limit in my 11x15 room (even with 6 sound abbsorbtion panels on the side walls to soak up the bright plaster lathe walls). They work incredibly well with Tube amps, and I would have to assume that "Gotog" had them hooked up to the 4 ohm taps on his amps, because the 8 ohm taps sound 100% better, and actually are more efficient. Not sure why, but they sound much better with a slightly Higher ohm load (with a tube amp, and I think the theory goes that tube amps work opposite of SS amps in this department), and you get much better bass response, and a better blend of the midrange. On 4 ohm taps the midrange jumps out in your face, infront of everything else. These opinions are with the speakers Bi-Wired, and using a Sonic Frontiers SFL-1 Hybrid preamp with 20db of gain. Don't use MIT interconnects with a Tannoy/Tube amp combo, there's already plenty of Midrange (I made this mistake for 1 year, went through 3 preamps before I figured it out). Good Luck!