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Author Topic: JBL SRX828SP  (Read 3909 times)

Bruce Johnson

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JBL SRX828SP
« on: August 03, 2017, 03:36:51 pm »

Sorry if this I am putting this in the wrong forum.
Question: Does anyone know if it is okay to daisy chain the JBL SRX828SP to itself.

The sub has 2 XLR inputs for channel 1 & 2 each. They both have direct XLR outs. Can I daisy chain channel 1's direct out to channel 2's input?

I am guessing it would be fine for instances where I am not running a stereo signal.

Thanks,
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Bruce Johnson
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Will Knight

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Re: JBL SRX828SP
« Reply #1 on: August 03, 2017, 03:43:57 pm »

Hi.  Before anyone can assist yu, please go to your profile and change your user name to your real name as described in the forum rules when you first signed up. Otherwise your post will be locked by the Mods - VERY quickly.


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Don T. Williams

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Re: JBL SRX828SP
« Reply #2 on: August 03, 2017, 04:42:41 pm »

Bruce, you could do this, but there is no reason to.  There are two input channels so a single sub can be used with stereo full range top speakers by using the "thru" outputs.  Plugging in stereo and on thru gets both left and right signals into the sub where they are summed to mono.  These are only input channels for the sub and are not connected to two separate amps in the sub.  The sub itself is always mono.
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Bruce Johnson

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Re: JBL SRX828SP
« Reply #3 on: August 03, 2017, 04:51:26 pm »

Got it.
I thought with only 1 input I was using half of the sub.

thanks for the explanation.
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Bruce Johnson
A.V. Rental Services, Inc.
2024 East Westmoreland Street,
Unit E-1
Philadelphia, PA 19135
PH: 267-463-7043
FX: 800-695-5943

boburtz

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Re: JBL SRX828SP
« Reply #4 on: August 04, 2017, 12:13:13 pm »

Got it.
I thought with only 1 input I was using half of the sub.

thanks for the explanation.
We do this with a Y cord, but chaining the two channels does the same thing. It offers a 6db measured increase in SPL. I'm sure you could get the same increase by adjusting the attenuation, but it's easy enough to do and it makes me feel like we're getting everything they're worth.
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Bruce Johnson

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Re: JBL SRX828SP
« Reply #5 on: August 04, 2017, 01:19:28 pm »

When I use a 'Y' cord I always feel like I am splitting/cutting the signal in half.
Whenever possible I stray away from adapters. Empahsis on 'whenever possible'

Bruce
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Bruce Johnson
A.V. Rental Services, Inc.
2024 East Westmoreland Street,
Unit E-1
Philadelphia, PA 19135
PH: 267-463-7043
FX: 800-695-5943

Ivan Beaver

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Re: JBL SRX828SP
« Reply #6 on: August 04, 2017, 05:05:35 pm »

When I use a 'Y' cord I always feel like I am splitting/cutting the signal in half.
Whenever possible I stray away from adapters. Empahsis on 'whenever possible'

Bruce
You are not losing any signal when you Y, UNTIL you start to Y a lot.

A good rule of thumb is that as long as the total load impedance is 10x the source impedance, you will not have signal loss.

Of course if you were to plug into both of the inputs of the OP speaker, then the impedance load that the source "sees" would be half of a single channel.
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
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Don T. Williams

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Re: JBL SRX828SP
« Reply #7 on: August 04, 2017, 11:54:19 pm »

+1 for Ivan . . . again!
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Ivan Beaver

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Re: JBL SRX828SP
« Reply #8 on: August 05, 2017, 10:51:20 am »

We do this with a Y cord, but chaining the two channels does the same thing. It offers a 6db measured increase in SPL.
It DOES NOT get you 6dB in overall SPL, ONLY a 6dB gain in sensitivity, at the expense of more setup time.

So it just takes less drive voltage to get to a specific SPL.

The max SPL WILL NOT increase any amount.
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A complex question is easily answered by a simple-easy to understand WRONG answer!

Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!

Steve Garris

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Re: JBL SRX828SP
« Reply #9 on: August 06, 2017, 04:04:08 pm »

It DOES NOT get you 6dB in overall SPL, ONLY a 6dB gain in sensitivity, at the expense of more setup time.

So it just takes less drive voltage to get to a specific SPL.

The max SPL WILL NOT increase any amount.

When I did this I measured an increase in volume of 3db. That was with the output volume all the way up.
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