Other sub amp for Gallo Ref3 secondary voice coil?

I gave up waiting for the Gallo amp and ordered a Hsu 500A (500w) subwoofer
amp with a 43 Hz crossover module. I had a 30-day moneyback period to
decide, and really like the thing. It's a SERIOUS amp and an ideal match for the
Ref 3s, which I'm driving with 12 wpc SET monoblocks (845 output tubes). The
500A costs $749 direct from Hsu, approx. $200 less than the Gallo sub amp.

Originally, I was using a Fosgate Audionics 100wpc amp with a Hsu electronic
crossover on the second voice coils, but this setup didn't have nearly the
authority of the 500-watter. Good luck, Dave

PS You need to break in those second voice coils just like the rest of the
speakers . Play 'em loud and hard.

My SET monoblocks (845 outputs, EL34 drivers. 6N7G inputs) designed and built by a friend, have huge trannies and the 12w output is conservative. They never run out of steam but are rolled off at the bottom so that they don't have to waste power trying to drive that last octave. That's what the sub amp is for.

All you can do is try yours and see if they have enough oomph. Certainly the Ref 3s love tubes. Good luck, Dave

I was contacted by a Ref 3 owner who had tried inexpensive subwoofer amps (sounds like the ones mentioned above, but I'm not sure) and found them too wimpy to do the job. They work, but without the authority of the Hsu and ( I presume) Gallo sub amps. Strictly hearsay, of course. Dave