What is DC offset?

[audiobahnkid592]

both class D amps i repaired were really low one was 0.003V and one was 0.005V. So this means my amps are in great shape? or how does it work?

[1moreamp]

Originally posted by audiobahnkid592
both class D amps i repaired were really low one was 0.003V and one was 0.005V. So this means my amps are in great shape? or how does it work?

Lower DC Offset is better...

Low is good....

Zero actually exists in the real world. Positive or negative means nothing. It's the number itself and how far from the prefect world of zero offset that counts IMO.
The further away from the perfect zero the more I study the amp wondering if the amp is even worth fixing.

Also consider this, Most high quality amps have some sort of DC output sensing for the built in protection circuitry. The higher the DC output the closer you are to tripping the amp off line before the amp gets to full unclipped power.
I have a sweet looking Zapco 500 sitting here. It has just under 60 MVDC out at idle no signal no load. Customers complaint it was cutting on and off while playing. Well DUH ! I wonder why with 60 milli-volts DC just leaking out without a signal applied.

So you see DC OFFSET is important, and it does effect the proper operation of many amps. Bridged or not. It is something worth paying attention to in most cases.

This Zapco has a small fan located underneath it, and it was mounted into carpet so it got no cooling air inside it until it was way too late. The amp baked on itself so pretty much everything inside sits and leaks DC out from stage to stage to output.

I use it to hold the door open now....

[Clipped]

i just tracked a scratchy channel at low volume to an opamp, the tantulum connected to the supply leg blew and caused the opamp to become defective....Dc offset was 0.579, but the higher i turned the volume the lower the offset would be, it would return to normal level at a certain volume, but at low volume sounded horrible.

[Perry Babin]

If the cap failed (opened), it could have caused the op-amp to become unstable. It may have been oscillating at a low level.