I'm a 2-channel guy that decided to add a separate HT system. I currently have a center channel speaker and AV receiver running through my 2-channel preamp's HT bypass. I just purchased rear channel speakers. I hate subs for 2-channel, but are they required for HT?
Although its been a couple of years ago, I had an HSU sub and don't care for them. If it was for music it would be JL Audio, but for HT I submit SVS is a safe bet, offering good value.
My recommendation would be for a pair of smaller (10-12 inch) subs rather than a single large sub. And use LF acoustic room correction if possible. You can often find a used Velodyne SMS-1 listed online, if your AVR or processor doesn't provide it.
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