Sunfire XTEQ8 User Manual page 15

Connections to a Preamplifier Using "Y" Cables
If your preamplifier does not have a dedicated sub/LFE output, you can use "Y" cables to
send its main outputs to both the subwoofer and your amplifier.
The subwoofer will play the low frequency range and your front speakers will play the
full range. Although bass is commonly distributed evenly between left and right channels
(L+R bass), movie soundtracks often contain differential (L-R) bass. The opening scene in
"Transformers", for example, has loads of L-R bass information. If this is not preserved, the
bass in these scenes sounds anemic. Therefore, systems which do not have a dedicated
sub/LFE output should use both the left and the right inputs as shown, for the greatest
bass impact.
An alternative connection method without using Y cables is shown on the next page.
If your preamp/receiver has a dedicated sub/LFE output,
then only one input is used as shown on the previous page.
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