That has nothing to do with SINAD , there are a lot more to an actual product than raw performance.See how long you can enjoy the sterilized sound of Bruno's Kii speakers for, I've tried a few times 1/2hr max for me.
Because you'll get verbally raped if you did.
I don't know of any designer worth his salt that goes into production even if it's SINAD is the best ever, without listening to what they've designed first to see if they like it. If it were the case we'd all own Topping D90SE dacs and Topping LA90 amps, but we don't do we??
I would possibly live with the D90SE DAC but I’ve already have an old D70 for my headphone rig that still works just fine so I’m not up for a replacement. When that happens I probably get a combined headphone amp and DAC.
When I got the D70 I already had my Violelectric headphone amp ( it seems to work forever good quality ).
DAC’s are truly transparent for human listeners these days I would chose from other criteria than just SINAD
( we have a whole tread for people who are delusional and don’t believe this )
The LA90 is simply to small the most important spec of an power amp is simply power
Topping does not have a stellar reputation for quality regarding thier amps so I would be hesitant. I would get any of the good hypex or purify options.
But actually I just ordered a pair of KEF ls60 and KC92 after selling my Meridian stuff.
I have no idea what DAC’s they use or how the amps perform inside those the end result is good thou.
And re speakers never heard the Kii’s and if they sound bad to anyone it’s not due the amps but rather the acoustical performance and voicing of them .