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Author Topic: JBL SRX828SP  (Read 3056 times)

Steve Garris

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Re: JBL SRX828SP
« Reply #20 on: August 08, 2017, 02:05:34 pm »

I believe that is called "not enough rig for the gig" .  No reason to be clipping any gain stage...

The question was aimed at the Y cord option to get added gain out of the system. Tim's post suggested to simply turn up the main output on the mixer. If there's no room to do so, then why not use a Y cord for an extra 3 db?

I'm not saying I need this, but just trying to get a clear answer.
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BrianHenry

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JBL SRX828SP
« Reply #21 on: August 08, 2017, 02:28:02 pm »

The question was aimed at the Y cord option to get added gain out of the system. Tim's post suggested to simply turn up the main output on the mixer. If there's no room to do so, then why not use a Y cord for an extra 3 db?

I'm not saying I need this, but just trying to get a clear answer.

Hi Steve, what Ivan was saying is that the Y cable increases input sensitivity, not gain.  The max output the speaker is capable of doesn't change. If you get 3 db by using a Y cable, you could also achieve this with a stronger input signal.


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« Last Edit: August 08, 2017, 02:30:22 pm by BrianHenry »
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Steve Garris

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Re: JBL SRX828SP
« Reply #22 on: August 09, 2017, 01:51:03 pm »

Hi Steve, what Ivan was saying is that the Y cable increases input sensitivity, not gain.  The max output the speaker is capable of doesn't change. If you get 3 db by using a Y cable, you could also achieve this with a stronger input signal.


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Still don't understand. Where would you get that stronger input signal?
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Rob Spence

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Re: JBL SRX828SP
« Reply #23 on: August 09, 2017, 02:22:31 pm »

Still don't understand. Where would you get that stronger input signal?

Turn up the source (mixer main out or inputs)?


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Paul G. OBrien

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Re: JBL SRX828SP
« Reply #24 on: August 09, 2017, 07:58:01 pm »

Still don't understand. Where would you get that stronger input signal?

Anywhere in the signal chain before the actual amplifier technically classifies as "input signal" and that includes the DSP built into these SRX powered boxes. So the moral of this story about a very beaten dead horse is.. get the app already and crank up some gains until the box behaves like others in your inventory. There is NO danger in doing this.. the limiters will still protect the same as before.
« Last Edit: August 09, 2017, 08:00:41 pm by Paul G. OBrien »
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Tim McCulloch

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Re: JBL SRX828SP
« Reply #25 on: August 10, 2017, 10:01:54 am »

Still don't understand. Where would you get that stronger input signal?

Because the input to the sub has sufficiently high impedance, it acts as a bridge rather than a load (so it does not reduce in the voltage); doubling the number of inputs with the same voltage increases the voltage "seen" by the amplifier input.

Or you could turn up the subwoofer drive level at the console or turn down your top boxes by -3dB (or more, to taste) if you loop through the subs (or tops) for inputs and turn up the console output.

This ain't rocket surgery and I'm alternately amused and frustrated that this simple concept has generated so much unnecessary work, much of it based on legacy drive level expectations that are older than many of the participants here.
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Steve Garris

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Re: JBL SRX828SP
« Reply #26 on: August 10, 2017, 01:49:16 pm »

Because the input to the sub has sufficiently high impedance, it acts as a bridge rather than a load (so it does not reduce in the voltage); doubling the number of inputs with the same voltage increases the voltage "seen" by the amplifier input.

Or you could turn up the subwoofer drive level at the console or turn down your top boxes by -3dB (or more, to taste) if you loop through the subs (or tops) for inputs and turn up the console output.

This ain't rocket surgery and I'm alternately amused and frustrated that this simple concept has generated so much unnecessary work, much of it based on legacy drive level expectations that are older than many of the participants here.

I've already stated that there is no headroom left at the mixer. The sub is turned up all the way, and the tops are already set at a reduced level.

The Y cord will get you an added 3 db of volume if you are out of gas everywhere else. I've decided that I don't need it, nor do I need to go into the dsp to add makeup gain via the compressor.
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Steve Garris

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Re: JBL SRX828SP
« Reply #27 on: August 10, 2017, 01:50:32 pm »

Turn up the source (mixer main out or inputs)?


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The source (input gains and master output) is all the way up. There is no headroom left.
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lindsay Dean

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Re: JBL SRX828SP
« Reply #28 on: August 10, 2017, 02:15:37 pm »

  Are you using the proper low filters on each channel strip
that do not need low end ?
 it sounds like that could be where your head room is being maxxed.
Worth visiting
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David Allred

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Re: JBL SRX828SP
« Reply #29 on: August 10, 2017, 02:57:49 pm »

The source (input gains and master output) is all the way up. There is no headroom left.
Do the output meters of the mixer reflect this?  Or are the faders physically maxed?
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