Nad 304 Protection Mode

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Just picked up a NAD 304 and connected to B&W DM601 series 2 speakers (bi-wired). Sounds great until I turn up the volume. With the volume control at about 10 o clock the red light comes on and sound goes off. Is there anything I can do to fix this or do I have a compatibility issue with the speakers? I believe these are rated at 4ohms.

Hope someone can help.
 
Hi

B&W 601 S2 are 8 ohm speakers. Even though, that cannot be problem with this issue. I had same problem few years before with one 304 and I think was problem to put new power supply caps, the big ones. U can check does amp has any bad solder joints and idle voltage with service manual.

Nice amp, 35Watts per channel.
 
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