A few things on the question of modding these, as hypothetical as it may be ...
- Anybody interested in the topic should read Jack's other comments in this thread. In particular, his comments about how the B&O modules aren't entirely an all in one solution - no shielding, and some gaps in protections that an amp typically has:
I completely agree about the total lack of protection circuitry on the B&O modules. It was very shortsighted of B&O to not include anything and especially dumb to not disclose this for a long time. For both the P2 and P5, we had to build an extra PCB to add all of the normal protection to the amplifier. Shorts, DC, etc. Any power amplifier without these basic protection circuits is just not acceptable. - post
So there's not just modules in a box with connectors on the back and a power switch - there's that stuff, plus the NHT bus and front panel control and maybe more.
You can find his comments easily by going to this search page (an Advanced Search for this thread)
, then search for posts by Jack Hidley. Doing it from this thread will give you just his posts in this thread.
- Setting aside all that for a minute, though ... broadly speaking, couldn't you just disconnect the 500ASP from one or both of the 500As and run a completely separate power supply? IIRC these modules allow for some voltage variation, so it might not be terrible sensitive to a less than perfect power supply, though the cleaner the better no doubt. There are definitely DIYers running just the modules hooked to a power supply.
- The other thing that's potentially interesting is the detailed data sheets on the modules at B&O's site: 500A for amplifier performance
and 500ASP for power supply
- The other mod that has been suggested is to tap into the audio channel on the ASP module to make this a three channel amp.
One minor topic- there was a post in another thread about how one of the IcePower 1000 modules had a lot of distortion in the treble at higher wattages. If that's an issue with all of this generation of modules, it suggested to me that even though the amp is only designed for 200 WPC at 8 ohms, there's another advantage to having the 500A modules if using a module in the lower range of its capabilities reduces the distortion. Though it might not be an audible difference.
Though far, far more important is the ability of one channel to use extra power when the other channel doesn't need it.
Anyway, it would seem using the 500 series modules would give these amps some real advantages over an amp that used the 200 modules, at least if you ever used more than 50-70 WPC or so. So even though the design is a little unusual, it has some advantages.