January 28, 2023, 8:39pm
When using an XPSDR with NDX2 does anyone know where each power feed is used?
From reading the new classics thread (and incompatibility with nDAC) I am guessing +/-10V is DAC related.
I might guess +/-22V could be analogue stage.
Does this mean the 2 x 15V feeds are related to streaming board and DSP areas?
This taken from the main site:
Four isolated transformer windings with six low-noise DR power regulators - configured as two isolated regulators for digital at +15V, isolated +/-10V for DACs and isolated +/-23V for analogue stages
January 28, 2023, 9:04pm
Ha ha serves me right. RTFM.
Matches what I can see from internal pics too.
So as a transport I wonder if we’d be exercising one or both of the 15V feeds.
January 28, 2023, 9:24pm
In the ndac the clock appears to have its own supply. Maybe 15v is used for clock.
January 28, 2023, 9:26pm
Don’t know the specifics, but the reason NPX300 can’t power nDAC was due to the negative rail being required for DAC chip I recall.
NPX only has +10V
January 28, 2023, 9:36pm
The clock in the ndac requires its own power supply, which is anything above +8v. So it is possible +15v is used.
January 28, 2023, 9:38pm
Anyway we already have a 555PSDR on nDAC.
I guess my outstanding question is whether both 15V feeds are used on NDX2 as a transport.
Looking at the pictures of both a NDX 2 & XPS DR i’m going to say yes, and i think this is where the biggest appeal of the external PSU lays. However this just pure speculation from my part. Maybe someone who is more clued up than i may like to comment and set the record straight.
January 29, 2023, 7:48am
Yeah, my visual inspection of internal pics suggests same but can’t really be sure what each feed to boards is used to drive.
I could always crack out the multimeter but if someone from naim could tell us it would be handy
Itch to be scratched.
Money > Sense
You’re probably best asking Naim support.