I sent one of my A370 amps to Jeremy (Folsom) so he could evaluate it and make some modification recommendations. Once it arrived, Folsom offered two options that I dubbed, "Level 1" and "Level 2." For now, I opted for the Level 1 mod. Folsom can provide the technical specs on what each level entails.
The amp arrived back home yesterday and I compared it to my stock amp. I used the exact same settings and compared the two amps on the same speaker. My preliminary assessment is that the modded amp definitely sounds cleaner. Actually, the stock amp sounds muddy in comparison, and I never thought I'd ever use the term, "muddy" to describe my servo subs because it's the cleanest bass I ever heard. I had a hunch that the amp could be improved upon, and now I know for sure that there's another level of high fidelity that can be reached by modding the A370.
I would consider this a final mod, after you've exhausted all other significant upgrades, mods and tweaks.
In the next week or so, I'll do some critical listening. My gut tells me that if the bass is cleaner, then the mids and highs, and sound stage may have also gotten a boost.
Here's a before/after pic: