Bel Canto Dac 3

yes, if there is a simple mod, consider it.

I had the DAC 2.5 and now have the 3.7 DAC. 

i have not heard the DAC 3, but I have read that it leaned a bit with some digital etch (top end). if that is so, how about running the DAC 3 through a tubed preAmp, then your amp, which could be SS/tube/NCore Class D. the older ICE modules for Class D still have some etch, the NCores typically do not. 

and using some cables that are not lean, but warm and detailed with great dynamics such as Triode Wire Supply. I use their ICs, and Pete's "Digital American" power cables that are made specifically to reduce digital glare. they definitely help. I run one into my DAC, my CDP, and my Class D amp

But I can’t emphasize enough how much dirty electricity makes digital etch worse. To combat this, I use a power isolator into a conditioner into my Electronics