Does anyone know if it is possible to use the phono pre-amp ground input to ground an external sub when using high frequency connection? on the AMP.
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This sounds at best unwise -- potentially injecting hum -- and at worst dangerous to the integrity of the Amp. What exactly are you trying to achieve? A high-level connection to the REL?
What is the ground on your phono preamp hooked to? Likely better to use that for the sub too.