Tubed Monos for Focal Aria 948s


I'm considering a pair of tubed monos for my Aria 948s. Given that their efficiency is at 92.5 it seems that I could swap the 130W SS monos for the warmer tube sound in the 40W range and not have any issues. Any ideas how much bass would be lost? Do I need to factor gain into the equation? Already have a tube preamp and like the way that sounds, even like the the way the SS monos sound but since the Focals are so clear my thought is that tubes would pair very well.

Thanks
128x128Ag insider logo xs@2xzyphryx
Not sure what your budget is, but Rogue Audio's monoblocks are fantastic. I have the M-180s. No experience with those speakers, so can't say how they would match up. When I had my Legacy Audio 20/20s (94db efficiency if I remember correctly), it was intense! They're great with the Harbeths I have now also. 
@decooney I agree with bass on the 948s. I thought Focals were a bit light on the bass by nature but not these. I'm using a Prima Luna Dialogue HP for the preamp and love the sound.

@big_greg I figured that I would need around $5k for a good set of tubed monos so the Rogues are possible.

Just read a post about speaker impedance and amps which should help. Looks like a lot of math but that should narrow the parameters considerably 
@zyphryx

"OP: "I could swap the 130W SS monos" ...

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@decooney I agree with bass on the 948s. I thought Focals were a bit light on the bass by nature but not these. I'm using a Prima Luna Dialogue HP for the preamp and love the sound."

zyphryx, 
Are you running 130W SS amps or Prima Luna Dialogue HP now?

What are you not getting out your current amps you hope to get out of new tube monos respective to your Focal 948 speakers?

@decooney I have a Prima Luna Dialogue HP pre amp that is connected to a pair of Odyssey Khartago mono blocks. They sound fine as is but the Focals are so clear that it sounds a little lean in the bass. As erik_squires pointed out, there is a dip in the upper bass range so my thinking is that the warmth of the tubes may help the tonal balance. Is this is incorrect?