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Using both inputs on subs.


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#1 of 9 OFFLINE   mitch

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Posted March 09 2008 - 04:22 AM

Hi All,

I am now using two subs in my home theater system; the infamous and all powerful SVS PB12/Plus 2 and my older sub, the very accurate and beautfiful Velodyne HGS-15.

The system sounds great with the two subs. It really fills in the home theater room in my finished basement. Being a "bass-aholic" like myself, movies are fantastic to watch.

My question is: I have the subwoofer signal split comming from the receiver with a Y connector, then the two cables from the Y connector going to both subs [one sub is in the front of the room [the Velodyne] and one in the rear of the room [SVS]. How important is it to have double inputs going into the sub as opposed to a single plug? Some say that you get a better signal if you use a Y connector for two plugs at the sub imputs as opposed to one.

Does anyone have any information on this as I want the best sound that I can get out of my system [as we all do!] and getting two Y connectors would be pretty cheap to buy for the sub inputs. I don't even know if they make single female/two male Y connectors

Thanks for the information as always!

Mitch

#2 of 9 OFFLINE   Robert_J

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Posted March 09 2008 - 03:13 PM

Both inputs on a sub's plate amp are summed internally. Adding a "Y", you are cutting the signal in half (3db drop), feeding both inputs and then combining the signal. No change other than adding additional connections in your signal chain.

Quote:
Originally Posted by mitch
I want the best sound that I can get out of my system [as we all do!]
Your time and money would be best spent calibrating. Level matching with an SPL meter at the minimum. Real time analyzer and a parametric EQ for ultimate tweaking.

-Robert

#3 of 9 OFFLINE   mitch

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Posted March 10 2008 - 03:30 AM

Thanks Robert. That's very good advice and information!

Mitch

#4 of 9 OFFLINE   Robert_J

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Posted March 10 2008 - 04:03 AM

Basically, the same info you got at AVS.

-Robert

#5 of 9 OFFLINE   Kurt Ferguson

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Posted March 16 2008 - 07:16 AM

As was already said, the two inputs are just summed internally, since they are just going to one subwoofer. The only real change you get from the Y splitter is as Robert said, you cut the signal strength in half. That's not particularly important provided the voltage isn't getting too anemic, which I doubt it would be. The gain on the two subs should be able to easily compensate for the reduced signal level anyway. So in short, you should be fine.
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#6 of 9 OFFLINE   Mjorgensen

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Posted March 17 2008 - 02:28 PM

Will the reduced signal be cleaner, or just less db? I have the JL Gotham and the engineers at JL said it would be better to use a Y connector and use both inputs.

#7 of 9 OFFLINE   John Dirk

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Posted March 17 2008 - 02:34 PM

Quote:
Originally Posted by mitch
Hi All,

I am now using two subs in my home theater system; the infamous and all powerful SVS PB12/Plus 2 and my older sub, the very accurate and beautfiful Velodyne HGS-15...

You ARE a bassoholic! I have the PB 12 Plus/2 and can't imagine ever wanting more bass.

"I wanna party with you cowboy!"

John
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Any of YOU guys call ME Francis, and I'll kill ya!"

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#8 of 9 OFFLINE   Robert_J

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Posted March 18 2008 - 01:38 AM

Quote:
Originally Posted by Mjorgensen
Will the reduced signal be cleaner, or just less db? I have the JL Gotham and the engineers at JL said it would be better to use a Y connector and use both inputs.
The signal should be the same except 3db lower when split. Did you speak directly to the engineers at JL or did that come via 2nd hand information? You can post this question using "JL" in the subject line at AVS Forum and there is a good chance that Manville Smith will answer it.

-Robert

#9 of 9 OFFLINE   Mjorgensen

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Posted March 18 2008 - 02:30 AM

Quote:
Originally Posted by Robert_J
The signal should be the same except 3db lower when split. Did you speak directly to the engineers at JL or did that come via 2nd hand information? You can post this question using "JL" in the subject line at AVS Forum and there is a good chance that Manville Smith will answer it.

-Robert

This information came from my dealer and when they recieved my Gotham this is what was relayed to them from JL. I will PM Mr. Smith for the skinny.

Thanks,


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