Has anyone modded a NAD521 series CDP ?

unnair · 10th August 2004, 07:20 PM

I have a NAD 521BEE cdp and would like to explore what options are there for modding this with good benefits other than the standard Caps/Diode/opamp !

Thx !

rickerlove · 15th August 2004, 04:15 AM

Hi everyone,

I'm new with microchip and I'm having some troubles sorting out what ever is worong with the mucop code. I have read most of the postings in this thread and I'm pretty sure it's something I'm doing wrong. If anyone would like to share a pre-assembled and known working hex file for the 16f877 I would greatly appreciate the help. That way I can trouble shoot my project rather than just plain shooting it.

how many people have manage to get the Mucop functioning?

thanks everyone.

mb · 18th August 2004, 08:56 AM

Have you already done down the cap/diode/opamp path?

I found the 521i / 521BEE much greater challenges to mod than Philips and Marantz players in the same budget range. While the Philips-based units have less regulation on various power supplies, I found that the "better" opamps, caps, diodes I put into the NAD very quickly changed the sound to the detriment of NAD's original voicing (too explicit and detailed without benefits of greater smoothness or bass). I was not keen on the fact that the 5V regulator is fed by the 12V reg with a zener in between.

I think NAD took a lot of effort to get the 52x / 54x (similar I believe) to sound the way they do, whereas the budget Philips have a simple effective design, compromised by cheap components and layout.

Removing the mute section helps. Attention to the dac power supply will get good returns too.

10th August 2004, 07:20 PM	#1
unnair diyAudio Member Join Date: Aug 2004 Location: Basel	Has anyone modded a NAD521 series CDP ? I have a NAD 521BEE cdp and would like to explore what options are there for modding this with good benefits other than the standard Caps/Diode/opamp ! Thx !

15th August 2004, 04:15 AM	#2
rickerlove diyAudio Member Join Date: Aug 2004 Location: b	SOS Mu-Cop (mucop) ASM code issues Hi everyone, I'm new with microchip and I'm having some troubles sorting out what ever is worong with the mucop code. I have read most of the postings in this thread and I'm pretty sure it's something I'm doing wrong. If anyone would like to share a pre-assembled and known working hex file for the 16f877 I would greatly appreciate the help. That way I can trouble shoot my project rather than just plain shooting it. how many people have manage to get the Mucop functioning? thanks everyone.

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18th August 2004, 08:56 AM	#3
mb diyAudio Member Join Date: Dec 2002 Location: Singapore	Have you already done down the cap/diode/opamp path? I found the 521i / 521BEE much greater challenges to mod than Philips and Marantz players in the same budget range. While the Philips-based units have less regulation on various power supplies, I found that the "better" opamps, caps, diodes I put into the NAD very quickly changed the sound to the detriment of NAD's original voicing (too explicit and detailed without benefits of greater smoothness or bass). I was not keen on the fact that the 5V regulator is fed by the 12V reg with a zener in between. I think NAD took a lot of effort to get the 52x / 54x (similar I believe) to sound the way they do, whereas the budget Philips have a simple effective design, compromised by cheap components and layout. Removing the mute section helps. Attention to the dac power supply will get good returns too.

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