Because I’ve been running PS Audio M700’s with an SGCD before and a DirectStream Sr. now, I forgot why people hate the Bose 901. Well I found out today.
I just built a Nelson Pass B1 Buffer/Preamp. I built a dual mono version for true balanced operation. Pin 2 is my male hot pin and pin 1 female hot pin.
Nelson Pass Assembled and Tested B1 Buffer/Preamp :
My friend lent me two Hypex (NCORE) 250W Class D Balanced Amp Kits that he put together. They have been my surround speaker amps for 4 months. I’ve never done any critical listening to them until today when I wanted to see if the NP B1’s can warm up the NCORE amps a bit. They are just a Hypex module with some basic input filtering to remove any unwanted RF from creeping in stuffed inside a box with an LED. Beggars can’t be choosy since I’m still paying off all my PS Audio stuff.
The B1 Buffer Preamp is dead quiet with 2 old 2WIRE 12VDC supplies wired in series. Shocking (get it power/shocking - i’m here all month - quarantined of course) since they are swiitching power supplies. It does warm the input a bit without killing female voice sibilances and the midrange is not harsh at all. Bass is unaffected as well.
The M700’s have nothing to worry about. The NCORE’s somehow recreate the hated Bose Stereo/Mono EVERYWHERE sound. Yuck. Direct out of the DSD Sr. and into the NCORE’s or with the B1 in line with the DAC/Amp’s, it was there. The sound Paul described in his video 2 years ago ! There is NO Phantom Center for vocals, snare hit, etc.
I tried both flipping the phase button on the DSD Sr.'s remote and flipping the speaker wires around. Nothing worked.
As soon as I put everything back to the way it was before, all was good in my audio world once again.