Anyone with W4S amps and preamp

My preamp is a VAC Renaissance running balanced outs to the W4S ST500. Speakers for this setup are N802 and the system sounds great. I have never tried to run the amp single ended so I can't say what the difference might be. The manual for the W4S states that balanced is the preferred connection.

I am running the SX-500 monos into Maggie MMG's,

it is a great combination for sound quality, power, and price

My pre-amp is an Adcom GFP-750
definitely coveting the W4S STP pre...think it would be a nice upgrade from the Adcom GFP-750

I am running a ST-500 into a pair of Earl Geddes Abbey 12As, and it sounds great. I use a RHB Sound Dezign modified CJ PV-14L for a preamp, which means I have no choice but to use single ended cables. I am completely happy with the sound of this combo, it is very revealing.

Peb

I am using a Bel Canto Pre 3 that can be has for $950 used while my tube pre is being made.

It is wonderful sounding and would be the perfect upgrade for you.

Boy does this little unit sing!

I am using a Bel Canto Pre3 now and have paired it with Bel Canto a pair of M300s, the S300 and the S500. Also tried the PS Audio Trio A-100 and lastly a Seymour AV ICE Block 5001 with the Pre3. All of these setups were run with balanced connections. My least favorite was the S500 which is a surprise as that is the most expensive one in the bunch.
At this point I am not using class D amps. I picked up a Harman Kardon PA-2200 amp built in the mid to late 90s. After giving the amp a thorough cleaning I installed an IEC socket, rewired the A/C from the socket to the transformer, then rewired the output section with DHlabs cable and installed some Cardas binding posts I had on hand. Put the amp in just to see how it sounded and have had no desire to remove it. Warm, full sound, just a joy to listen to.