Okay, Rick, don't tell your wife, but the sub would be just fine behind the cabinet. Those very low bass frequencies wouldn't be blocked and as I said, that corner might well be ideal. Tom Vodhanel will have your 25-31 custom tuned to 22Hz at no extra charge if you ask. The effect is to lower the maximum output in the 30-60Hz area slightly, but to flatten and extend the response a little lower. No, there's no provision on the 25-31 to plug a port to lower the tuning.

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Enjoy the music, not the equipment.