Do I need to decouple/isolate my preamp amp from my stand?

Rather than decouple, try coupling using ceramic or brass cones. I found it to bring sharper focus to upper mids and highs.

First, ignore multiple poster roberjerman. He has anti audiophile tourettes disorder and pounces on any and every thing that works. He’s never tried it but he’s the first to decry it.

Having said that, your amp and preamp will benefit from something whether it’s isolation or decoupling. I just got some Isoacoustic Oreas for my integrated and SACD player and to put it simply, they work, and then some.

I thought my Marantz Reference PM15S2b was heavy enough at 41 lbs. to negate any untoward vibrations. Wrong. Using them brought a large amount of focus to the music. I’m still scratching my head on that one as I’ve tried several of Herbie’s Audio products which just mushed up the sound.

Next, was my SACD player and that’s where the fun began. I situated the rear footers like I did with the integrated. For the front, I tried various positions until I found one that moved the front wall back, which I’ve never experienced. Sounds were emanating in all directions. Echos and decays went on forever. Clarity took a major leap up and it was all due to even more focus. I’ve spent many hours listening, enjoying my music anew, and kinda hate it when I have to do something else. There’s so much music lost from bad vibes that I never knew possible, and I say this listening to music I know very well.

The best placement for the SACD player was with the two front footers almost touching each other, centered under the CD mechanism’s placement, and about 3" in from the front facia. I was told a single point source might work better than two but I needed to use two due to the weight loading limits of the footers (there are 4 types for most weight ranges).

You won’t know until you try and with these Oreas, if you don’t like them, just send them back to Music Direct for the cost of the postage.

All the best,
Nonoise

If you want the best sound get Critical Mass Center stage 2 1 1/2 feet i use 3 the best sounding isolation feet out there.

I have Nordost Sort Kones under my amps and Grand prix Audio Apex under my preamp. They made a positive difference reducing distortion and improving clarity

Turntables benefit from isolation. CD/DVD players, DACs and Streamers - NO! 

Isolation under an amp/preamp - Flat Earth Science!

A waste of $375!

Whats your floor made of ?

I would recommend: isolate your audio stand from the floor, and isolate your source (CDP or TT) from the rest of your components.
Herbie`s are the affordable way to go.

I bought Townshend platforms for my speakers, but didn't realize the outrigger feet would make them unusable.
So, I put it under my Atma MP-1. The result was a noticeably cleaner sound. I bought mine from a dealer on Ebay from the UK. He gave me a decent price and very good service.
Bob