I have a Yamaha 573 receiver and Infinity p363 tower front left and right speakers. I am looking at adding a powered sub, but am running low on funds and the wife's patience.
I was going to pull the trigger on one of those budget subs like the Polk psw-10 that's on sale for $80 on Amazon right now, but I noticed on the specs that the frequency only goes down to about 40hz. My tower speakers go down that low. Should I wait until I can afford a little better of a sub, or will it still improve my overall sound?
If you only have $80 to spend, then go ahead and get the polk sub. I would guess that even though your mains are rated down to 40 hz, the extra sub will make the lower frequencies sound better. As other have written, you can get a much better sub if you can up your budget to the $200-$300 range.