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post #1 of 15 Old 10-07-2014, 04:11 AM - Thread Starter
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Subwoofer High Level Connection

Hey so I have a stereo amp with both a A+B channels, both of these have speakers connected so I have 2 Left and 2 right speakers. I just bought an active subwoofer with both high level inputs and outputs so what I was wondering is if I take the A channel (both left and right speakers) and put them into the high level inputs on my sub, then run another set of speaker wire from the high level outputs of the sub to left and right speakers will this be a safe way to connect them?

I'm wondering if this will add any load to my stereo amp or will the subwoofers amp be powering it therefore making my stereo amp not have any additional load as the sub is only taking the signal?

Also will this degrade the sound quality to my original speakers in any way?

and does the subs crossover still work? I read somewhere that this set up stops it working and makes the sub have poorer sound quality.

Thanks for any help
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post #2 of 15 Old 10-07-2014, 04:42 AM
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"both of these have speakers connected so I have 2 Left and 2 right speakers"

why?

This is how you want to wire it up.

http://www.ecoustics.com/electronics...dio/488955.gif

Thing is, doing it this method is really best if the sub has high pass feature, but instead of using speaker level, you use RCA low level, between pre and power amplifiers.

RCA

source->pre->sub ->power->speakers

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post #3 of 15 Old 10-07-2014, 04:50 AM - Thread Starter
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Because I put two speakers front and two behind and it gives more of an immersive sound that and I had another two speakers knocking around and thought why not haha

And that diagram is how I wanted to set it up yeah my amp doesn't have a sub output so my only option really is the high level connection, doing that wouldn't make the speakers have poorer sound quality would it? Or add any extra stress to the amp?
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post #4 of 15 Old 10-07-2014, 05:01 AM
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You're doing quad sound so I think you're not concerned with sound quality.

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post #5 of 15 Old 10-07-2014, 05:19 AM - Thread Starter
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Well the A speakers sound the same whether B is connected or not, I didn't know running A+B affected sound quality?
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post #6 of 15 Old 10-07-2014, 05:22 AM
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phase cancellation.

Just have one pair of speakers.

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post #7 of 15 Old 10-07-2014, 05:31 AM - Thread Starter
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I never even thought of that, gunna run some tests later.

Anyways back to the subwoofer. So yeah if I plug the sub into left and right then the speakers into the subs high level out left and right that would work?

And no stress added to my amp?
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post #8 of 15 Old 10-07-2014, 05:47 AM
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It will work, no additional stress. Possibly less stress if the subs filter out the bass from the high Level outputs.
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post #9 of 15 Old 10-07-2014, 05:50 AM - Thread Starter
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Awesome thanks a lot

Does phase cancellation even apply if speaker are front left and right and back left and right? Is there anyway around it?

If not what is the point of the A/B channels?
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post #10 of 15 Old 10-07-2014, 05:50 AM
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Won't make any difference as not filtering out LF before the amp section.

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post #11 of 15 Old 10-07-2014, 05:56 AM - Thread Starter
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Ahh okay, I always thought it sounded better with both speakers on but I will have to test it with various music and films etc...

Anyway thank for your help
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post #12 of 15 Old 10-07-2014, 06:00 AM
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Does phase cancellation even apply if speaker are front left and right and back left and right? Is there anyway around it?
Switch one pair off. quad surround is ok for parties but if you're serious about 2ch audio you'd have just one pair of speakers

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post #13 of 15 Old 10-07-2014, 06:03 AM - Thread Starter
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Alright I will probably just go back to having only my A speakers then. Save B for any special occasions haha
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post #14 of 15 Old 10-07-2014, 06:11 AM
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Two pairs of speakers puts extra demand on your amp too.

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post #15 of 15 Old 10-07-2014, 06:17 AM - Thread Starter
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Yeah I know I thought the amp would have been wired in series as it says 8/16ohms so my guess was that one channel=8 two=16 but it turns out they're wired parallel thus reducing the impedance to 4ohms which doesn't make sense to me
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