Isolation transformers on CDP to reduce glare?

yes, absolutely- lower noise floor, less 'glare'- Ensemble Isolink- I use two- one on transport, one on dac- would not be without them now...

I've gotten the same results by upgrading power cords on CDP's.

I'd rather stick with Craig. I haven't heard an isolation transformer so far, at least used in the configuration as suggested above, which did not subtly reduce resolution across the entire musical spectrum.

RSVP if you want info on better DIY PCs to try. I also found that a proper iso/absorb shelf (Neuance is my favorite) to reduce perceived glare by tightening coherence.
Certainly experimenting with different ICs will help you tailor the top octaves response to your liking. But first things first: start with a good PC and a Neuance. If you're still stuck get a CDP with less digititis. Seriously....

My system uses isolation transformer based filter arrays (Clear Image T4) and there is a definite improvement. I can see your point, Detlof and I use serious vibration control measures on my transformers to enhance clarity and resolution. This has been one of the great lessons I have learned: how vibration affects electricity. Nonetheless, the overall result is better than before.

By the way, I'm still waiting for the pictures...

If one wants to try isolation transformers, the best place to start is eBay. ONEAC isolation transformers are pretty much musically benign and can be gotten cheaply through eBay for $10-$40 used.

Isolation transformers benefit greatly from vibration control measures. Detlof is correct.