sub hookup question

"So if I used the record out ,I would just have to control the volume from the sub each time?"

Yes. You would have to use the volume on the Brio R to the speakers, then match the sub's volume to that. So you would be using (2) volume controls in that scenario.

Just run another set of speaker cables from the Brio R to the subwoofer, not from the speakers to the sub, but from the Rega to the sub.

Depending on the sub, if the sub has both speaker level inputs and outputs, you could run the Rega into the sub, then run your current bi-wire cables from the sub back out to the speakers.

A friend just bought an REL and it has exactly what you are looking for. It taps off of the speaker outputs with 2 tiny wires. No extra outputs needed, no external/sub crossover. If you can afford it, check it out!

you might want to look into acquiring a Rega Mira 3, which has more wattage and the variable outputs useable with a subwoofer.

I cant run speaker cables from the amp-- they are taken up by the bi-wired speaker cable

"I can't run speaker cables from the amp-- they are
taken up by the bi-wired speaker cable."

You just parallel another set in with what you have now.
That's how you usually do it. It won't hurt anything as
long as you don't have any stray/frayed wires that could
touch each other.

If you are using banana plugs with your bi-wire set, use
spades with the sub wires. If you are using spades with
your bi-wire set, use bananas with the sub wires.