More watts or better power ?


Hello, I am currently running a PS Audio BHK Preamp, which has a tube input stage, to a Pass Labs XA25, Class A (50watts at 4 ohms) power Amp, into a pair of Sonus Faber Minima Amator II bookshelf speakers. My system sounds very good, and at 4ohms, I have 50 watts of power to my speakers, which is on the lower end of their rating.

What would be a better investment (most bang for the buck) into the system? Replace the XA25 with a higher watt amp (PS Audio BHK 250?), or spend the same money on a power conditioner (PS Audio Power Plant II?) Or upgrade the Minima Amator (which are sounding very good) to another set of speakers.

The system is in my bedroom, I have a very small house, hence the smaller Sonus Faber Speakers. I have beenplaying around with an SVS micro sub as well.

Other system parts, Clear Audio Concept/ Concept MC, Pass Labs XP15, Little Green Roon Server, Schitt Yiggi, and a Luxman MQ 88 Tube amp in rotation.

Appreciate your input
Mark O





128x128marktheshark
There is a good article with Pass Nov 1 2018 issue of Stereophile in the Jim Austin article. If you Google Nelson Pass on power conditioning you should reach it. It's basically already done in his equipment.
Mark, if you plug your subwoofer into a preamp output it will relieve some of the bass load from the Pass.
Set the crossover and the sub will supplement the bass and provide low-end extension.


Jonto, thanks more good reading
Lowrider, thanks I have the unbalanced out to the amp, and then the balanced out to the sub.
I have found that you can never have too much power.  I would look into one of Nelson’s more powerful amps.  I wouldn’t waste money on different cables, the change will be subtle at best. Nelson Pass advises against using a power conditioner with his amps. He has already addressed it in the build of his amps.  I would move up to a 150wpc in the Pass line.  By staying with the same brand, the synergy shouldn’t change.  
Replace your DAC.  That is the biggest limiting factor in your system.

Happy Listening.