Then there were 2

a pair of mono 120 sold in 56 minutes the other day once posted on Audiogon. It was posted at 9:52pm and I got home at 10:50 and it was sold.

this is wierd my post did not "post"
lets try this again: Input Impedance
ARC 300K balancedRogue 200K (not specified)QS 100K single ended
ARC should be fine

There are 2 woofer in each cabinet. The woofers themselves are 90db. but with 2 in parallel it is higher but I dont have exact measurements of efficiency. speakers are 4 ohm.

@jimbones Tube amps do not double power as impedance is cut in half. That is why efficiency is a more useful spec than sensitivity when tube amps are involved. In this case, while sensitivity does increase, the efficiency remains the same. Since the total wattage of most any tube amp is lower into 4 ohms, I think you will find that you simply need more power.

I would also consider putting the woofers in series rather than parallel. They will act the same in the enclosure although you'll have to change your crossover a bit. But a tube amp will thank you as it will make more power, have wider bandwidth (particularly in the bass) and make less distortion.

@atmasphere good point, will do. Or maybe just make it a 8 inch 2 way 8 ohm speaker.

@jimbones Well then its 8 ohms, but the efficiency in all cases remains the same. I think you're better off with the dual woofers, because you have more surface area for making bass and less excursion. Putting them in series works great for tubes.