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question on stereo L/R input on sub

by tmwalsh01 / March 5, 2010 11:18 AM PST

bought an rca coax splitter and 12 ft rca run for my receiver's subwoofer out. the back of the sub (mirage ss-1000) has L/R input so I split the single line. That's the way i've always been directed to do this.
Today at work I was extolling the virtues of and the stuff i bought, but then someone asked why split it L/R? They didn't see any benefit. I got nothin for that one. Does anyone know a reason (technical or otherwise) why you'd split a mono signal into a L and R input?

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This sounded very strange, but...
by ahtoi / March 6, 2010 1:23 AM PST

it may be we are not on the same wavelength. What do you mean by "single line"? left audio out or right audio out and is this a speaker out connection or is it a sub-woofer out?

As for the "rca coax splitter", what are you trying to do there?

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Sub's L/R input
by tmwalsh01 / March 6, 2010 2:17 AM PST

its the subwoofer line out on the back of the receiver. Maybe 'single' wasn't the best word. I take that line, use the splitter into L/R male RCA connections, and then input that into sub's L and R input.

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Y-Connector on Sub
by Dan Filice / March 6, 2010 6:29 AM PST
In reply to: Sub's L/R input

I connect my Infinity powered sub-woofer to my Yamaha receiver using a "Y" connector too. The RCA connections on the back of the sub-woofer are the "Low Level Inputs, which have L & R connections. It's the receiver that has a single "Mono" Low Level Sub-Woofer Output, so to connect that to the sub-woofer requires a Y-Connector with RCA plugs. It's a combination of your sub-woofer being a powered sub and your receiver that determines the need for the "Y" connector. On my Yamaha, the low bass signals from the main, center and rear channels are directed to this single jack, which on my receiver, has a cut-off frequency of 90 Hz. The LFE (Low Frequency Effect) signals are generated when Dolby Digital or DTS discs are encoded with this LFE signal which are decoded and directed to this single jack on the receiver. When the LFE signals go to my sub, the amp in the sub then amplifies these low frequencies instead of overloading the receiver. The low bass signals are very demanding on any amp, which was the whole idea of making powered sub-woofers. I believe the High Level Input connections on the sub are used when a receiver does not have the LFE low-level jack which is intended for a powered sub.

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This sounds kind complicated.
by ahtoi / March 6, 2010 4:45 PM PST
In reply to: Y-Connector on Sub

Hope it was cover in the manual. My logic probably wouldn't think in such a way. So why the hick don't they provide some jumpers system instead? or maybe I just haven't got it, hehe. But I will keep this post in mind when I change my old system, thanks.

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Kinda complicated
by Dan Filice / March 7, 2010 1:58 AM PST

Yes, it's complicated, but i was quoting most of my response directly from both the Infinity Powered Sub manual as well as the Yamaha manual. Don't forget, low frequency is non-directional, so there really is no need to have a true Left-Right split at that frequency, and the LFE signal that is encoded into DD and DTS discs goes is intended to be sent to a powered sub-woofer to allow it to process and amplify the frequency. As mentioned, receivers get overtaxed when they try to process the low frequency signals, which is why powered sub-woofers were made.

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by tmwalsh01 / March 7, 2010 3:13 AM PST
In reply to: Kinda complicated

Appreciate the post. My setup is as yours is. A friend asked why split since they noted as you its not a true stereo input. It works. I'm happy. is great.

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