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Old 03-31-2012, 07:27 AM   #1
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Audio sucks after hard top removal

I can't seem to find the thread about
Putting the jumper in the connection
After removing the hardtop
Anybody remember the process?

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Old 03-31-2012, 07:50 AM   #2
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I dare you to make less sense.

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Old 03-31-2012, 07:55 AM   #3
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I dare you to make less sense.
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Old 03-31-2012, 08:03 AM   #4
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As far as the audio sucking after hardtop removal. What did you expect? You completely changed the acoustics. There is now nothing for the sound to reflect off.

And the other questions I have no idea.
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Old 03-31-2012, 08:04 AM   #5
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Quote:
Originally Posted by OutlawJK View Post
I can't seem to find the thread about
Putting the jumper in the connection
After removing the hardtop
Anybody remember the process?
I remember the thread and know what you are talking about but couldn't find it.
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Old 03-31-2012, 08:35 AM   #6
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I remember the thread and know what you are talking about but couldn't find it.
I have no recollection of said thread, absolutely no idea what he is talking about and was unable to come up with anything further. I tried my best though!
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Old 03-31-2012, 08:59 AM   #7
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he is correct and we will have to find the thread. in a nut shell when you pull off the hard top an audio limiter comes into the circuit limiting the systom output so as not to disturb the neighborhood.

its in the wiring harnes that you unplug from the hard top and you can fool the system by jumpering after unplugging.
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Old 03-31-2012, 09:00 AM   #8
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He's not crazy I read about this on jk forum. It seems like when you disconnect the wiring harness when removing the hard top the audio system limits itself. There was talk there about jumping two connections in the harness to over ride it.
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Old 03-31-2012, 09:03 AM   #9
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Are you serious? So why a Jeep and not every convertable?

This thread just might get interesting

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Old 03-31-2012, 09:03 AM   #10
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found it on the jk forum: i take no credit for this at all.....



This is the diagram of the hardtop harness.

This is the plug that goes into the hardtop.

DO THIS AT YOUR OWN RISK I'M NOT RESPONSIBLE IF YOU RUIN YOUR JK!
With that said, I took a test light hooked it to a ground (I used the ground on the trailer wiring) and was checking the different pins in the plug to find out what was causing the radio output to change. I found that when the violet w/ white stripe (CAV3 in diagram) is grounded the stereo cut out for the half second and returned back to what a call normal output if the hardtop was on (stronger output of sub and sport bar speakers).

I'm just gonna make a jumper wire that will connect the CAV 3 and CAV 6 (black wire) together. But the best fix would be to buy the other half of the plug and properly connect the the wires to make the circuit.

P.S. Some of you have said that they've removed the hardtop with no radio change and some have had the change like me. I do not know what models and years are effected. All I can tell you is that my Jk was born December 07 and purchased January 08. I do have the speaker popping problem when playing CD's but have not received the amp re-flash due to comments of diminished power output.
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Old 03-31-2012, 09:17 AM   #11
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I still dont understand it i guess. It looks like all they are doing is grounding the rear wiper switch.
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Old 03-31-2012, 09:20 AM   #12
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we really need the rest of the audio circuitry to see whats tied in to that circuit upstream that the grounding effects it.


heres more about it.

http://www.jk-forum.com/showthread.p...ardtop-removed
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Old 03-31-2012, 09:26 AM   #13
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Quote:
Originally Posted by mathjak View Post
he is correct and we will have to find the thread. in a nut shell when you pull off the hard top an audio limiter comes into the circuit limiting the systom output so as not to disturb the neighborhood.

its in the wiring harnes that you unplug from the hard top and you can fool the system by jumpering after unplugging.
Thank you.
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Old 03-31-2012, 09:32 AM   #14
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What a coincidence this thread was started this morning. I've had my hardtop off for about two weeks now and was just thinking to myself yesterday that the stereo didn't seem to have the same output as when the top was on, but just assumed it was because of the changed acoustics with the top off.

I've got a 2008 and this should be easy enough to test with a volt meter or test light. If it is in fact true, this is a great find. I'll let everyone know if I can recreate the results in the post above.
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Old 03-31-2012, 10:15 AM   #15
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I checked the violet wire with my volt meter and there is a 5-volt current going across this wire, but I did NOT notice any change in my stereo output when I bridged the violet wire with the black ground wire.

My 2008 was originally purchased in 04-2008, but I'm not sure when it was built. It has the Infinity 7-speaker w/subwoofer & CD-changer. Not sure if stereo type makes a difference.
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Old 03-31-2012, 11:13 AM   #16
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I just tried this in my 2010 JK Sport. I have all stock audio equip. I used a bit of copper wire with the insulation snipped off the ends. I stood there and connected and disconnected the bridge several times with volume up at 16 and bass at 4 on the stock stereo. I had a hard time noticing a difference but I left it in anyhow.

I went on the highway where my Bikini top usually makes a good amount of flapping noise and with the volume still at 16 I could hear it better. Before I would have had to have it at about 18 to 20 for it to really sound "right."

I guess it's worth it but not a big improvement by any stretch, at least to my ears. I waiting for the weather to get nice... (supposed to be 71 here today, but its still 43 and foggy) and then see how it sounds with the top off all the way.

I'll try to report back later today or tomorrow. Supposed to be 81 here on Sunday.
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Old 03-31-2012, 11:09 PM   #17
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Quote:
Originally Posted by mathjak View Post
he is correct and we will have to find the thread. in a nut shell when you pull off the hard top an audio limiter comes into the circuit limiting the systom output so as not to disturb the neighborhood.

its in the wiring harnes that you unplug from the hard top and you can fool the system by jumpering after unplugging.
This just doesn't make sense to me. The output from the front speakers is still plenty loud enough to create just as much "disturbance" in any neighborhood with the top off even if you turn the fader all the way to the front.

I'm just not buying that they would intentionally lower the output on the soundbar speakers when you unplug the hard top harness.
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Old 04-01-2012, 06:35 AM   #18
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Thanks Mathjak
I wouldn't say I'm not crazy but I knew I've read about adding the jumper
Thanks for the link
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Old 04-01-2012, 10:53 AM   #19
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This just doesn't make sense to me. The output from the front speakers is still plenty loud enough to create just as much "disturbance" in any neighborhood with the top off even if you turn the fader all the way to the front.

I'm just not buying that they would intentionally lower the output on the soundbar speakers when you unplug the hard top harness.
I have to agree, I installed my soft top and came home the other night and my wife was able to hear me down the street. I have an 07, Infinity 7 speaker w/sub and stock head unit. Not sure whats going on in this situation.
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Old 04-01-2012, 11:07 AM   #20
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They have been making convertible vehicles like the Jeep for years. Why have we never heard of this on anything but a JK? Iím just not sold that this is doing anything. There are so many factors that affect the JK sound system like the acoustics with the top on or off, the rear seat installed or not, or even the weather the day you took your top off and noticed it was louder.

I think we might want to hire these guys:
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Old 04-01-2012, 11:58 AM   #21
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This works. I tried it today and what a difference it makes..Great Post!
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Old 04-01-2012, 12:11 PM   #22
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This works. I tried it today and what a difference it makes..Great Post!
April Fools right?
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Old 04-01-2012, 12:47 PM   #23
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Another way to test this would be to disconnect the harness and keep the hard top on. That way you're not changing the acoustics. I thought having the hard top off was causing my stock radio to sound like crap with the top off, but this could be a contributing factor.

I think I'll try this later. I have a '12 Sport, with the stock radio (just with Sirius), and no sub. Needless to say the sound sucks!
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Old 04-01-2012, 01:00 PM   #24
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How about someone measures AC voltage at a soundbar speaker with a 1kHz test tone and then unhooks the top harness and measures again with everything else staying the same??
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Old 04-01-2012, 06:40 PM   #25
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it may not be a voltage change, voltage may stay constant and current changes. tube amplifiers used to increase wattage by a voltage change, most solid state amplifiers increase wattage by increasing current .

some amplifiers increase both ... it all depends on the design of the amplifier.

you have to know what type of amplifier you have.
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Old 04-01-2012, 07:55 PM   #26
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^^ I don't know.. I just know I always set the gains on amplifiers using AC voltage.
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Old 04-01-2012, 08:12 PM   #27
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Either April Fool or soft top owners are screwed. Same thing, right?
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Old 04-02-2012, 04:38 AM   #28
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^^ I don't know.. I just know I always set the gains on amplifiers using AC voltage.
gain controls are not volume controls. gain controls effect sensitivity.

you can raise the voltage up or down to match the sensitivity of your components so the master volume control works them evenly but that has no bearing on how power is controlled..


whether you open your gain control all the way or close it down the systems power output stays the same.

opening up the master volume control may increase current flow but leave the voltage setting in your gain control unchanged.

if you think of water we can set a pressure we want to maintain in our hose ,thats the voltage and gain control.

but as far as controlling the actual amount of water we will get that depends on how much the source is providing.
we can maintain that pressure but by using a bigger hose we can pass more water at the same pressure if the source could provide it .thats our volume control and the water is the current.

pressure is one thing , thats our gain control adjustment but actual amount of water flow is current and thats our volume control. .

like i said though some amplifiers do control power by altering both voltage and current and others by altering only current once you set your reference voltage with your gain control.
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Old 04-02-2012, 06:24 AM   #29
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Interesting discussion on the connector.

Though, since the speakers are a fixed resistance, how do you alter the current without altering the voltage?
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Old 04-02-2012, 07:01 AM   #30
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Interesting discussion on the connector.

Though, since the speakers are a fixed resistance, how do you alter the current without altering the voltage?
Thank you I thought I was the only one wondering what happened to Ohm's law.

V=I x R

The only thing is that speakers are not purely resistive.

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