Adcom GFP 555II Preamp Bass Lacking

I changed my setup around. It's a budget system not too special:

ADS CD3 Cd player (Soon to be Adcom GCD 575)
Adcom GFA 555II Recapped with ELNA caps
Adcom GFA 5200 80 WPC into 4 ohms
a/d/s/ M-15 Speakers 4 ohms (1" Dome tweeter, 5.25" Cone mid, 2 10" bass drivers) in a single bedroom apartment.

Changing the speaker placement made all the difference. The Elna caps added greatly to the SQ of the preamp and gave the bass more punch.

The Lab output does in fact bypass as many filters as possible for the cleanest most "airy" sound.

I plan to run a 12" DIYMA subwoofer ported tuned to 29Hz as well.

I also want to upgrade my power amplifier to the matching Adcom GFA 555II. Good idea? I would expect it should sound better than the GFA 5200 Mosfet power amp but I have never compared them so I can't judge...

-Keith

Moviemakerkeith,
almost all of the adcom preamps use a tiny power transformer. it kills dynamics, and bass response. replace it with an outboard 400 watt toroid and you will be shocked at the sonic improvements in all areas. I have worked on a half dozen Adcom pres. they alll take a huge jump when the power supply is beefed up. best.

Sounds like a great idea. I looked around but where would the best place be to order one and about how much can I get a good one for?