Relationship of amplifier sound to transformer quality?

Thanks so much for your help. Much appreciated.

If this is not just transformers, if it is two complete power supplies you are talking about combining together in parallel, then what you are really talking about is doubling the capacitance. With twice the power supply storage capacity you should notice a profound, or at least decent, improvement in bass slam, with more authority well up into the midrange. The top end may even improve. Hard to say how much. The existing power supplies being mono and separate units are already probably very overbuilt. But I have yet to see the power supply that wasn't improved by bigger/better/more caps. It is the kind of extravagant expense no sane manufacturer would ever do. But as they say in racing, run what you brung!

The transformers are not running daisy-chained. They are in parallel which means combined together working simultaneously. If I were to hook them up in series, it would double voltage instead. So yes, It will double the va rating or current capability with a slight loss due to leakage and bring C from 13,600uf per channel to 40,000uf per channel since I will put in bigger caps than oem. An interesting experiment for this kit. This is similar to paralleling an amp for increased current capability vs bridging for increased voltage or output as in watts.

I meant to say similar to paralleling two channels of a stereo amp or in this case a pair of mono amps. However just the PSUs paralled accomplishes the same thing.

They are in parallel which means combined together working simultaneously.

Actually, both PSU will not output exactly same voltages (e.g. one PSU output 55.1V and the other PSU output 54.9V), the one which output higher voltage will do all the work until the current demand from the load is high enough to make the voltage sag to the same voltage as the lower output voltage PSU, then the lower output voltage PSU will start supplying the current to meet the requirements.