Turn on / off pop with JBL MS8 and Sony

[themetalmaster]

Quick question for Lanson or anyone else who happens to know the answer.

I've got a 2011 SHO with Sony audio and navigation and I just finished installing a JBL MS8.

It seems like it is working pretty well, I like the logic 7 processing much better than the factory surround setting, but I am getting a nasty turn on and turn off pop from the speakers.

I used the violet wire coming out of the top connector of the factory amp as my remote turn on signal, it shows voltage when accessory power is provided, so it seemed like the right thing to do. I think it is labeled remote amp turn on in the factory wiring diagram.

How can I eliminate the turn on turn off pop?

[Josephm]

Do you have a good ground?

[themetalmaster]

As far as I know. I'm using a factory ground point behind the rear passenger seat bolster on the drivers side. Is there any test I can do to make sure I've got a good ground? The sound quality is excellent, no buzzing or hissing, just the turn on/off pop.

Turning the volume down all the way on the MS8 before shutting the car off eliminates the pop.

I'm thinking the MS8 and the Sony amp are powering up in the wrong order. So I need a better ACC wire to tap so the MS8 powers up first. I'm just not sure where to look.

Later today I'll try probing the blue connector on the Sony amp with my multi-meter to see if one of those wires is switched 12v. I was under the impression that they are on all the time, but I'm not sure.

[glock-coma]

I'm pretty sure it has to do with the order in which the different components are powered on. The ms8 is probably being fully powered up before the head unit. No positive though.

[glock-coma]

Damn, should of read your second post.
Looks like your on the right track.

[yowen]

I'm curious, is this your first audio-related mod to your SHO? Or have you done some other things as well?

If that's the case, does adding just the MS8 provide a significant improvement over stock?

[themetalmaster]

Damn, should of read your second post.
Looks like your on the right track.

I sure hope so. I will post an update if I figure it out. I appreciate the input.

I'm curious, is this your first audio-related mod to your SHO? Or have you done some other things as well?

If that's the case, does adding just the MS8 provide a significant improvement over stock?

Yes indeed. The stock speakers are pretty decent. Poly cones and rubber surrounds. The factory DSP has the active crossovers set a little funny so there are holes in the audio spectrum. At least to my untrained ear that's what it sounds like. Audio quality is subjective, but the improvement to me was really impressive, even with both of the stock subs disconnected.

[ShoBoat]

There are stock subs? Do you mean the ones in the rear deck?


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[themetalmaster]

There are stock subs? Do you mean the ones in the rear deck?


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Yes. The factory service manual refers to the 6x9's in the rear deck as subwoofers. They are crossed over pretty low so I called them as such.

[ShoBoat]

That would be why I couldn't really hear them lol. Thanks


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[Lanson]

Hey there, check the MS8 for delay settings.  I think there's delay that can be added.  If nothing else, you could employ a delay relay. 

As per my PM back to you, I used that remote trigger wire (purple with red stripe if my memory serves), coming from the Sony sub amp...and it worked well. 

Stand by, I'm going to DL the MS8 service manual and see if I can find the spot where delay is spoken of.

[Lanson]

OK, check it out

http://www.jbl.com/images/media/MS_8_OM_EN.pdf

Turn off delay: This setting lets you select a delay time for the MS-8 to turn
additional amplifiers off via its Remote Out terminal when the MS-8 goes into
its standby mode. The options are zero seconds (no delay), two seconds or five
seconds. The factory default is two seconds.

Try bumping this to 5 seconds, let's see what happens.

[glock-coma]

Lanson is the man!!!

[Lanson]

I'm curious, is this your first audio-related mod to your SHO? Or have you done some other things as well?

If that's the case, does adding just the MS8 provide a significant improvement over stock?

I can't tell you what the SHO can do with the MS8 but I can tell you what the Flex can do, and other cars as well since I've used the MS8 extensively in installs with success.  That said, I would say YES the MS8 is a serious upgrade, but I would also deaden and seal up as much as you can at the same time.  The MS8 can't make the car better if parts resonate.  VERY important.

[themetalmaster]

Thanks for the tips. I will give it a shot and touch back with results.