You have 2 options, and rigging an RCA cord to the subwoofer inputs is NOT one of them.
1) Buy active subwoofer
2) Get something to serve as a subwoofer amp. You can use an old stereo receiver.
Radio Shack (of all places) makes a small battery powered phono preamp that is dead quiet and highly regarded by some hardcore audiophiles, and its cheap. Even if your receiver does have a phono input, you might want to give this a try...
Its only in the chain for the sub. It works in the digital domain, and microprocessors are cheap electronics. To know if it would help you, you need to plot pure sine wave SPL against frequency from about 20 to 100. If thats nice and...
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At high volumes my system starts to sound shrill and am assuming it is the def tech that is the problem in the system (by itself it sounds boxy and tinny).
Why assume when it is very easy to test ? Just...
Your way better off than most. I would be satisfied with that for movies. Bassy music would benefit slightly by flatening that out.
I assume these are pure sine waves ? Warbles will make the curve look better than it is.
"C" stands for common. So, the "in" and one of the commons go to the posts on the back of the box. Make sure you know which post goes to C for each box so you don't end up with a phase problem. Then the other three commons go to your...