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Author Topic: Sub Question  (Read 8210 times)

Bill McIntosh

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Re: Sub Question
« Reply #20 on: August 18, 2014, 08:49:28 AM »

Just when you thought this tedious thread was over...... ::)  I  need advice on hooking this sub up.

This is the sub:

http://www.sweetwater.com/store/detail/EON518S/

 I have a Soundcraft EFX8 (http://www.sweetwater.com/store/detail/EFX8/) into a Dbx 1231 (http://www.sweetwater.com/store/detail/1231) into a QSC PLX 1804 (http://www.sweetwater.com/store/detail/PLX1804/).

  Normally, I run the main outs from the mixer into the EQ, then to the power amp, then to my passive Yamaha S115V mains. What is the correct method of hooking the JBL sub into this system? I have to buy the cabling, and want to make sure that I get the right stuff.


Thanks,

Bob
There are two approaches, aux-fed or post-EQ.

If you have a spare aux output from the mixer, connect one XLR from that to an input on the sub.  Then on the channel strips, send only the signals with low frequency content (bass and backing tracks probably) to that aux send.  The sub will handle the rest.  Yes, you would also roll off at about 120 Hz from the mains.

Or, you can insert the sub between the EQ and the QSC amp.  Send both channels to the sub, then right output from the sub to the right top, left to the left top.  Engage the high pass filter on the sub outputs -- this will keep the low stuff out of the tops. 

Aux-fed is simpler and gives you more control, but requires one available post-fade aux output from your mixer.  Post-EQ is easier to picture, but a little more difficult to get the levels correct between tops and sub. 

You didn't mention the make/model of the EQ unit.  Some of these have dedicated sub outputs, use that if it is present.

FWIW I use the post-EQ, but I am using a DR260 so I can easily change the relative levels between tops and sub from my laptop at FOH.
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Bob Burke

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Re: Sub Question
« Reply #21 on: August 18, 2014, 09:00:11 AM »

Excellent! Thanks Bill. I have a Dbx 1231 (http://www.sweetwater.com/store/detail/1231), and it does have a low pass filter. I do have an Aux that I can use as well, so maybe I'll try both methods.

You guys are the best!

Bob Burke

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Re: Sub Question
« Reply #22 on: August 18, 2014, 09:49:44 AM »

p.s.


  If I use the Aux Out from the mixer, which is 1/4" phone plug,  how do I connect that to the sub input, which is XLR? Adapter? Special cable?

Bill McIntosh

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Re: Sub Question
« Reply #23 on: August 18, 2014, 10:24:09 AM »

p.s.


  If I use the Aux Out from the mixer, which is 1/4" phone plug,  how do I connect that to the sub input, which is XLR? Adapter? Special cable?

Either a 1/4" balanced adapter + a regular XLR, or an adapter cable.

http://www.audiopile.net/products/Mic_Instr_Cables/MP_Adaptor_Cbls/Adaptor_Cables_2.shtml
http://www.audiopile.net/products/Adaptors_Connectors/Adaptors/Quarter_Inch_Adaptors/QuarterInch_Adaptors.shtml
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Re: Sub Question
« Reply #23 on: August 18, 2014, 10:24:09 AM »


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