Pass Labs amps and Avantgarde speakers

Mohano, my brother is using 2 Pass First Watt F3 bi-amping his Avantgarde Unos. 1 for the horns and the other for the sub. 1 amp is sufficient but 2 is a very nice improvement ... more headroom, ease to the music, more detail, open ...

XA30.5 SHOULD work with your Duo's ... good luck!

sounds like you have a great plan.. Besides, if it you don't like it, authorized dealers have a return policy with perhaps a restock fee...

I have no idea whether your amplifier choice will work or not, but please report back with your findings. There are quite a few of us horn users who wouldn't mind a bit of feedback :)

I agree, the XA30.5 along with the Avantgarde Acoustic Duo speakers would be an excellent match.

I go with the consensus and think the gamble will pay off.

I own the 30.5 and am impressed with how well it does at low power levels which is where I would imagine you would be with your AG's.

Below is a quote from Nelson Pass's paper, "Leaving Class A" at the Passlabs website:

"We apply a single-ended Class A bias at about 10% of the push-pull Class A bias. This is sufficient to improve the performance around 1 watt and below." also that single ended class A is considered the "king of class A".

Food for thought:

If a speaker is rated to give 100 db from 1 watt, it will take 1/10th of a watt to produce 90 db, 1/100 of a watt for 80, 1/1000 of a watt for 70. Of course other factors like room size and distance from speakers have to be figured in but I believe that not only that "the first watt" is important but the fractions below it are too, especially if you like low level listening and/or the decay of notes/sounds. Good luck.