What is the purpose of rca two inputs on sub - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 18 Old 10-01-06, 02:56 PM
Huck
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Question What is the purpose of rca two inputs on sub

Hi: A bit of a dumb question, but why is there two rca inputs (left and right) on my sub ( 20-39 PC+)? I only use one of them (left) coming from a single sub-out on my a/v receiver! Do some receivers have left and right sub-outs? Why do I need two inputs for a single-driver sub? Give me some scenarios where I would use both rca inputs, also, how would I use the two rca outputs(left and right) please! Thanks, Keith

Last edited by Huck; 10-01-06 at 03:20 PM.
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post #2 of 18 Old 10-01-06, 03:33 PM
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Re: What is the purpose of rca two inputs on sub

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Do some receivers have left and right sub-outs?
Yes, certainly older analog systems.

Quote:
Why do I need two inputs for a single-driver sub?
You don't. Usually the left and right have one of them designated LFE for the situation when only one is used (which is most often the case). Some people like to use a Y splitter and feed the single signal to both inputs.

Quote:
Give me some scenarios where I would use both rca inputs
You have an older analog preamp that has left and right out and you want to split it and send it to a subwoofer besides sending it to a power amp.

Quote:
how would I use the two rca outputs(left and right)
Usually older analog systems that didn't have bass management on-board, would use the filtering in the sub itself to split the low and high frequencies. The outputs containing frequencies above the crossover set in the sub would be sent to a power amplifier

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post #3 of 18 Old 10-01-06, 04:10 PM
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Re: What is the purpose of rca two inputs on sub

Thanks brucek..... again! Huck
post #4 of 18 Old 02-17-07, 09:12 PM
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Re: What is the purpose of rca two inputs on sub

tks Bruce.
this certainly clear my head for dual L/R jacks on sub but only 1 sub out on AV amp.
so just plug either L or R is enough.

will plug both jacks get better performance?
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post #5 of 18 Old 02-17-07, 09:44 PM
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Re: What is the purpose of rca two inputs on sub

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will plug both jacks get better performance?
Usually, one is designated as the preference to use for a single LFE input, but it still leaves the other open circuit. Hopefully they've loaded the empty jack so as not to pick up noise. Personally, I'd use the splitter method and use both inputs even if I had a single mono input..

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post #6 of 18 Old 04-18-07, 04:25 PM
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Re: What is the purpose of rca two inputs on sub

It is said using two L/R with a splitter wil give you a 3db lift ....

read it in my B&W sub manual
post #7 of 18 Old 04-18-07, 08:23 PM
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Re: What is the purpose of rca two inputs on sub

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lienly wrote: View Post
....will plug both jacks get better performance?
Hi there!!! ..... I also had the same question, I read the manual for my Velodyne VRP 1000 online and it says to use a "Y cable"; but my Infinity TSS750 didn't said anything about it, so I send an email to Infinity's customer service asking if I can use a "Y" to connect L and R input from a single output from receiver ... and their answer was the following:

David,
Good evening and thank you for your inquiry. I can understand
the concern in this matter. If your receiver provides a single RCA
Subwoofer output, there are a few ways you can connect the subwoofer.
You can run a single RCA cable between the Sub output of the receiver
and the wither the left or right input on the subwoofer. Or, you can
connect the output of your receiver to the "Y" connector, then connect
this to the Left and Right inputs on the subwoofer. There is no
"better" way to connect this, as either way should work, with the one
that sounds best the one you should choose.

I hope this helps.

SO, I'm using the "Y cable"
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post #8 of 18 Old 04-25-07, 09:08 AM
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Re: What is the purpose of rca two inputs on sub

I had asked the fellas at SVS this before i bought my sub if i needed a y connector and they told me that I only needed to connect one of them because they are sumed internally immediately.
post #9 of 18 Old 04-25-07, 06:16 PM
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Question Re: What is the purpose of rca two inputs on sub

really? 3dB up if connect both L/R on sub....:raped:
has anyone measured if it's true?
remember SVS says just either L or R and no difference.

Quote:
doreytp wrote: View Post
It is said using two L/R with a splitter wil give you a 3db lift ....

read it in my B&W sub manual
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post #10 of 18 Old 04-25-07, 06:36 PM
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Re: What is the purpose of rca two inputs on sub

Quote:
lienly wrote: View Post
really? 3dB up if connect both L/R on sub....:raped:
has anyone measured if it's true?
remember SVS says just either L or R and no difference.
If so, I think this would be akin to turning up your receiver's sub output by 3 dB. I don't think you're actually getting any more power or headroom out of the amp.

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