Avondale tpr4 output voltage sweet spot

[hifi-dog]

Just acquired a naim snaps with the Avondale tpr4 dual boards to use on nait xs2 as a ‘hicap’ . Checked the voltage before I hooked up and it was 24v but my initial impression was the bass had dropped off. Having read that the regs are set at 25 i dialled it up and sounds much better. Soo wondering if other people have tried different voltages and what the ceiling is fo naim pre. Thanks

 

[divedeepdog]

Back of Nac 12 says 24-30v, my TPX2's set @ 28v for A102.
New Naim may have some regulation in there to stop 'fiddling' I'd tread carefully above 25v without tech knowledge.

FWIW, I've found bass does drop off as you go up Naim hierarchy, (add PS's) what you get is more tuneful, textured bass. Going back you realise that extra bass is bloom.

 

[sq225917]

27v

 

[hifi-dog]

Seems to be quite different bass presentation between 24.5 and 25.5v.. weird huh! The higher voltage thickens the sound up kinda like a non dr high cap. Lower voltage leans off the upper bass/ lower mid..settled on 24.7! Might all be in my head tho..!