SPL PHONITOR 2..... LEHMANN CUBE SE.... PS AUDIO DLIII DAC....
If +/- 60v (ie 120v swing) is what SPL have determined for their circuitry that allows such fabulous performance (s/n ratio is amazing) then why question if it is necessary?
I have a Lovely Cube which had originally been beautifully built with PUKKA parts, has been totally modified and is now BEYOND the LEHMANN SE spec (ie it has BETTER wiring, BETTER CAPS, genuine Phillips transistors, a replacement TRANSFORMER and DUAL MONO ICs, properly biased) and I have a PS Audio DLIII DAC which has had a voltage change and a number of mods PLUS also a transformer replacement. I replaced the transformer on my Lovely Cube from +/-12v with a higher spec, better quality +/-15v one, and did the same on my PS Audio Digital Link III DAC too, both still run within the parameters of the rest of the circuit, and it improved the dynamics of both significantly. They have been running happily for a long time now like that. I also tend to put damping material on the inside of the casing/chassis, and on any ICs, as it really does make a difference.
I had, shortly after purchasing my Phonitor 2, contacted Stefan Audio Art who are well known for their headphone-associated mods, and in particular they offer various mods to some Headphone amps, but when I asked them about the possibility of improving the Phonitor 2 with some bespoke mods, their answer was that in their view it was an extremely well put together unit which they did not feel they could improve the sound of. That's a pretty good recommendation I reckon! All the 'standard' (ie non-audiophile) ICs in the Phonitor are NOT in the signal path.
However, I HAVE damped the insides, base and top of the casing with bituminous pads....and felt this was worthwhile.
By the way, I am using my Phonitor II as a pre-amp through an SPL Passeq and an SPL M-S Master into ATC SCM150ASL active speakers. It replaced an Audio Research Reference II.
In 45 years of enjoying fiddling, it is without a doubt the best sounding system I have ever used.
Headphones used are: Grado RS-1, BeyerDynamic T1 Tesslas, AKG K702
Edited by vintageaxeman - 6/17/16 at 12:09am