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Y-Splitter Cable into Sub = 3-10 dB gain?


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#1 of 3 OFFLINE   Glenn Verde

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Posted April 29 2004 - 03:42 AM

I read on a internet cable company that using a Y-splitter into the stereo input of a sub instead of a single cable into the mono input could produce anywhere from 3-10dB gain. Is this true or is it a marketing hype. Has anyone done this and noticed an improvement? Thanks.

#2 of 3 OFFLINE   Edward J M

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Posted April 29 2004 - 03:59 AM

A Y-splitter simply doubles the voltage to the low level sub inputs. Doubling the input voltage yields a 3 dB increase in sound pressure, all other things equal.

You can accomplish the same thing by upping the sub level 3 dB in the AVR and save $10-$15. :-)

The only time I recommend a Y splitter is if the sub auto-on circuit is sleepy and it needs a bit more juice to stay lit.

The overall sub level is a function of both the voltage at the input, and the gain setting on the sub amp. A Y splitter cannot "add" power; the sub amp will still be rated the same, no matter which way you slice it. Can't get blood from a turnip, IOW. Posted Image
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#3 of 3 OFFLINE   John Garcia

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Posted April 29 2004 - 05:56 AM

Once calibrated for SPL, you end up with basically the same thing, though you will likely be able to turn your sub amp's gain down a bit, yeilding slightly more headroom. The only reason I do it this way is for exactly the reason Ed mentions - auto on/off circuitry.

There is no way a splitter could ever yeild +10dB
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