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How to calculate resistance for a sub woofer

My 55 year old McIntosh MC-225 has speaker connections for 4, 8, or 16 Ohms. I use the standard speaker connections to connect to a Acoustech PL-200 subwoofer, which has in impedance of 8 Ohm. The PL-200 is connected to Focal 807v’s which are also 8 Ohm.
So what output should I use on the MC-225? I don’t know if the PL-200 connects to speakers in series or parallel (and the Acoustech support page doesn’t seem to work). Is there a standard way sub woofers work that I should assume?
I was using the 8 Ohm, but the amp died! Don’t know if this is related.
tommaster

Showing 1 response by edgewound

edgewound
259 posts
 
Are you using 2 subs or just one?

My preference would be to drive the subs with line level from the preamp. That way, the sub is electrically isolated from the MC-225. If the PL-200 develops any issues, it can send a dead short to the amp. Not good.
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