Subwoofer / Low Frequency Optimization: See here

Mike

Hi OP

I don't own Sonus Faber, but I heard them play. IMO, they seem to go well with MC amps, and what herd was driven by Tubes. IMO, they seem to have synergy. 

So, in my opinion, the MACs are a good bet.  For Subs. I recommend that you look into REL, 2 x is possible

What sub do you have?  If you haven’t optimized both sub placement and settings I’d start there (I can provide a couple helpful links if interested) as that alone can make a big difference if it’s not set up properly now.  Likewise room acoustics can be very important especially if your listening position might be a bass null.  Moving the listening chair a a foot or two closer or further away to see if bass response changes significantly can be a quick/easy way to see if that might be the case.  My guess is that just dialing in the sub properly might go a long way in making a meaningful improvement if you haven’t done this already.  Hope this helps. 

@soix has a great suggestion.

Subwoofers interact with room modes (standing waves at low frequencies) that create peaks and nulls at specific locations. Sometimes, asymmetric placement can avoid nulls and excite fewer problematic modes, yielding flatter bass response than symmetrical positioning would. Possibly of interest https://treblab.com/blogs/news/subwoofer-placement

Soix,

Yes that helps as it will lead to an easier decision when upgrading the mono blocks. I just assumed that new more power would do the trick. I will continue to test various scenarios before jumping into new amps.

Very helpful thank you....

P