I would add that the internal dac on the wa7 is bright and a bit edgy but has great resolution but overall is the cause of its limits.
Pairing with a better dac and the wa7tp for it brings the wa7 to its full potential.
Anyway even with that, I find the ha1 an easy few notches above overall.
Giving no real suggestions is not a suggestion in my book lol.
Therefore I will give you a suggestion that actually worked for me...
The simple addition of these rubber feet actually made a noticable difference in temperature..
My unit no longer boils and takes longer to actually get hot..
Yes for just a few dollars from the corner store I bought these feet for furniture and they do a perfect job so if oppo made some nice looking feet it would be nice but these work as well as any fancy audiofile isolators.
After listening to some other great amps lately on Speaker taps(virtue & First Watt),
I would have to say overall the ha1 signature is on the sweet side..
In fact if I would characterize the three amps with one word:
HA-1= sweet
Virtue= musical
First Watt= clarity