Is my amp the problem?

Aux,

right now I have a mindsp in the circuit. Since I am in an audio club I am fortunate to have loaner equipment available. So today someone lent me a Dahlquist LP-1. I know vintage Lol! It has a higher input impedance so I want to what the effect of that is.
On a related note,at this meeting the host was using GR Research dual 12 OB woofers with the A370PEQ amps. It sounded very good. I like OB stuff. However it is around 3K for that alone. Ultimately I would like to build a pair next summer. Hopefully I can save some money DIY.

Aux,

BTW  that supply looks nice. I would like to power 2-3 pieces of equipment with that. All low current draw. Do you think I would have to buy 3 or add connectors to supply multiple devices?

Class D's are fine for subs, but even the best ones are pretty poor in the upper mids and highs.  Also, It is FAR better to use a good stereo amp than to biamp with dissimilar amps.  Biwireing is good, biamping is not.

That power supply is pretty hefty. The specs are 4.16 amp if you are doing the +12V DC model. This is fine if you are powering a several items like the miniDSP (which is very low current draw and uses basic op amps).  It's fine even for adding Antimode 2.0 into the mix.  This power supply has a lot of capacitance.  The capicators they use could be better, but the price is right for what they give you.  If you need a split power supply (i.e. +15V / -15V), then you'll need a different power supply.

Stringreen what Class D amps have you heard and what are you comparing them to?

thanks.