I'd rather not use a sub but I am not getting much bass / SACD with the DV45.
SONY DVP725 was SACD only and seems like it has better BM but I wanted both DVD-A and SACD capability. Have not gotten any DVD-A disks just yet to try that format. Room is only 10 x 13 don't need a ton of bass ( sub )
But would like a bit fuller bottom end than I'm hearing now.

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My train wreck
My modest HT . .