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Here are some useful links.



But, on looking at it more closely, I have been guilty of a mistake myself, in that dBu and dBm are the same with a 600 ohm load impedance – I'd said that dBu and dBV were the same, they're not.

So, for your purposes, the 7600's meter readings are relative to +25dBu(m), e.g. -12dB translates to 25-12 = +13dBu.

Why do we do it this way ? My guess is that the amount of headroom is often more important than the absolute level – if you remove the – sign, the 7600 meters display the current headroom.