| Re: Mains and sub integration.
Oops, I understood this was for HT. If it will be a music sub only, then the 85 liters net volume tuned to 23.5hz will work just fine. There won't be any real need for a subsonic filter. You haven't said what amplifier you will be using for the sub, but most plate amps have a built in subsonic filter.
I'm not sure why you need to measure the amplifier impedance. The specs will tell you whether it's 8 ohmns stable or 4 ohms stable or both.
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