dpm2340 OP
Aerial 7B amp recommendations
If you look at the impedance graph of the 7B’s you’ll see they spend a lot of time where the power and current are needed from an amp, in the 3-4ohm region between 30hz to 500hz.
https://www.stereophile.com/images/archivesart/A7bfig1.jpg
The amp that’s needed is one that is comfortable at 2-3ohms, and one that has good current delivery.
The stock DNA-1 will have no trouble, tested at:
191W into 8 ohms
352W into 4 ohms
510W into 2 ohms
Yours with an even bigger transformer, is better again.
And the DNA-1’s gain is very high, an input voltage of just 100mV in gives full 191w output, that and with 100kohms input impedance, this amp is begging for a good passive preamp.
Cheers George