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Ultimate Geek
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Topic # 114020 5-Feb-2013 12:39 Send private message

Hi there,

I'm needing to connect a subwoofer to a stereo receiver that doesn't have a subwoofer output.

I know the most obvious way of connecting it is to use high-level (speaker) cables (ie speaker cables from receiver to sub, then speaker cables from the sub to the main speakers), thereby ensuring the sub manages the crossover between it and the main speakers as well.

But... can I use the pre-out of the receiver to drive the sub as well? The problem here is that it the pre-out is necessarily paired with a main-in, and is currently looped (ie, designed to allow the insertion of an equaliser or to use an external power amp). I was wondering if I used a Y-connector on each channel, thereby ensuring the pre-out/main-in connectors are still looped while also providing additional RCA outs (one per channel) to run to the sub (which has stereo RCA inputs).

So... 1. would this work and, if so, 2. which option (using speaker connections or the hybrid line-level connections) would be superior in terms of sound?

If useful, the receiver is a Marantz SR4320, and the sub is a Veoldyne CHT-R10

Many thanks for any advice...

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Voice Engineer @ Orcon
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  Reply # 756036 5-Feb-2013 12:44 Send private message

I'd go with the line-level and Y-connector option.

I've used speaker level before and it's OK but there is more noise at this point than taking it from the pre-amp out so if you have that option, go with it.

Edit: even better; feed the sub inputs from your pre-out, then use the outputs from your sub to feed the main amp input on your reciever.  Then it will provide a crossover which means your main speakers won't be loaded up with bass.

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  Reply # 756054 5-Feb-2013 12:55 Send private message

I like those subs, good choice Wink

Is there another way to connect your device/s so you can use the preout from the receiver for the sub duties only?

Potential (not likely hopefully) situation of the pre outs being ahead of the actual speaker outputs, due to not having any internal receiver processing applied.  Hopefully not enough to be an issue, but I have seen this rear it's head a few times when trying to lip sync etc.



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Ultimate Geek
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  Reply # 756067 5-Feb-2013 13:22 Send private message

Jaxson: I like those subs, good choice Wink

Is there another way to connect your device/s so you can use the preout from the receiver for the sub duties only?

Potential (not likely hopefully) situation of the pre outs being ahead of the actual speaker outputs, due to not having any internal receiver processing applied.  Hopefully not enough to be an issue, but I have seen this rear it's head a few times when trying to lip sync etc.


Thanks for the thumbs-up, Richard! I've heard they're pretty good, so I'm hoping it'll do the job.

This is actually just for the stereo receiver in the dining/kitchen area (where you put that cable through to the other side), so the receiver itself does no processing (I assume?). So stuff like lip syncing won't be an issue. At this point we'll continue to just use the Kef sub with the 6.1 setup with the TV...



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Ultimate Geek
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  Reply # 756069 5-Feb-2013 13:26 Send private message

ubergeeknz: I'd go with the line-level and Y-connector option.

I've used speaker level before and it's OK but there is more noise at this point than taking it from the pre-amp out so if you have that option, go with it.

Edit: even better; feed the sub inputs from your pre-out, then use the outputs from your sub to feed the main amp input on your reciever.  Then it will provide a crossover which means your main speakers won't be loaded up with bass.


Thanks for the reply and your suggestions.

Just so that I'm clear I've understood you correctly re your second idea:

I need 2 2xRCA cables;

1 goes between receiver's "pre-out" and the sub's "input"

Other goes between receiver's "main-in" and the sub's "output"

This means the signal being fed out of the sub and back into the receiver (therefore what is sent to the speakers) is filtered, based on the sub's x-over.

Is this understanding correct?

Thanks!

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  Reply # 756072 5-Feb-2013 13:31 Send private message

That's what the manual you attached indicates, yes.



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Ultimate Geek
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  Reply # 757236 8-Feb-2013 09:58 Send private message

Thanks for your help with this; the sub arrived yesterday and I connected it up using some cruddy RCA cables (the freebie ones provided with components) using the method suggested and it seems to be working well. Initially it hummed but this went away after a while; I've aso ordered some better-quality (and longer) RCA cables.

It's certainly got a good thwack to the music now (though is clearly more HT-oriented than music); once the cables arrive I can put it in a better spot and sort the settings out.

Speaking of which, has anyone know of a good (and relatively easy - ie no SPL measurements required!) set of instructions for setting up a sub? I have little experience in this field. Thanks!


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  Reply # 757274 8-Feb-2013 12:28 Send private message

Put the sub next to a wall or a start.
Make sure the sub is in suitable sized enclousure (if its not already in its own).

Play around with diiferent positions of the sub near the wall (face it different ways) until you get what you like from the normal most frequent seated positons OR entire room.

Play with the db levels of the sub vs the speakers and the 'tone'.




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  Reply # 757360 8-Feb-2013 15:11 Send private message

Yeah if you're feeding the sub with the same raw signal as your amplifier/receiver then you're going to have to do a bit more manual calibration of the subs volume level, crossover and phase settings.

Typically I'd set the sub volume to half way initially.

Then I'd turn the crossover dial right up to ensure the sub tries to recreate the same frequencies as the main speakers. This allows you set the phase correctly as you should be able to hear the interaction of the two systems.

Once the phase is set correctly (ie the sub assists the main speakers, as opposed to interfering/cancelling the main speakers bass output), you can then adjust the crossover down to a level where the sub contributes only at the lower end where the main speakers need the assistance.

Have fun!

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  Reply # 757367 8-Feb-2013 15:29 Send private message

Gooseybhai: Put the sub next to a wall or a start.


The generally accepted way to find out where the sub will work best is to put the sub where the "prime" seating position is. play something bass heavy and move around the room until you find the spot where it sounds the best and is acceptable practicality wise. That is where the sub should sit.

http://www.audioholics.com/tweaks/speaker-setup-guidelines/subwoofer-placement-guidelines







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