They are both great dacs.
Given that you dont need USB I'd go for the 7510 - buy some music with the difference in cost!
Dont feel your missing out getting the 7510 over the 7520, both are fantastic sounding - just aimed at different markets.
The 7520 DOES sound better - through both headphone AMD line output - its just whether given your system at the moment you would actually benefit from it.
I think the 7520 would be overkill in your system. I take it your playing Lossless files from your PC and not just MP3?
That'll make a bigger difference in your system than the 7520 vs 7510 I feel.
Also, something else to think about...
If you use USB rather than spdif from your PC, it will bypass the computer soundcard and the windows audio drivers, which can affect sound too.
Google a thing called ASIO4ALL, if you want to use spdif you will want your signal running into the dac to be "bit-perfect", which this software can achieve.
Hope this helps.
Last edited by Gazjam; 14-04-2009 at 08:44.
AC POWER
Hardwired 10kVA balanced mains powering entire system
AMPS
Meridian 557 power Amp (Modded) / PS Audio BHK Preamp (Modded)
SPEAKERS
Wharfedale Evo 4.4
DAC
PS Audio Directstream (Modded)
TURNTABLE
Pro-Ject X8 balanced output via XLR / Ortofon Quintet Blue cartridge
PHONOSTAGE
Pro-Ject DS3 B balanced Input (TT and Phonostage powered by Pro-Ject Power box RS2 linear psu)
DIGITAL
OPPO 203 (Modded: Linear PSU, i2s output to Dac) - Roon Endpoint, HDMI input used for all things Streaming/ PS5 /AppleTV ... also good for movies apparently?
MUSIC PLAYBACK
Tweaked AP-Linux based Roon Server into Oppo 203 as Roon endpoint
Ipad Roon Remote.
Apple Music/ YouTube via AppleTV, fed to Dac via Oppo HDMI input/i2s output to Dac.
SPEAKER CABLES
Biwired: Duelund DCA10GA (Bass) Duelund DCA16GA (mid & treble) Duelund 12DCA used as jumpers (On "Blackcat Cable" Chris Sommivigo's advice - yup, even with biwire it sounds better - and it does)
INTERCONNECTS
All Balanced: Ghost+ recording studio XLR cables