Question about Jl Audio 500/1 Car Audio Amplifier

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Rca Connection i have a wierd problem with my 500/1 when i put just 1 of the rca cables in to the +positive connection it plays the song great but when i put both in there isnt any bass and also sometimes it play a song and sometimes it doesnt.I really dont know what is going on i have owned several amps and never had this problem.But this is my first JL Audio amp tell me its just me and not the amp. Thanks

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  • AudioFreak Jun 11, 2008

    Thanks man it fixed it right up.

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  • 631 Answers

You need to check the shield ground on the head unit. The following link will guide you through the test procedure.

Shield Ground Testing

Posted on Jun 08, 2008

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Will this amp push 2 2000 watt subs?


hope this helps.

caution

About Power supply wires (MRP-M1000 only)

• 21mm2 is the minimum power and ground cable size

that should be used to connect this amplifier. The

length of these cables should not exceed 1m to assure

safe operation.

• If the length of the power and ground cables exceed

1m, or if you connect more than one amplifier, a distribution

block should be used with 33mm2 or 53mm2

power and ground cables depending on the length

necessary. Ensure that you install a correctly-rated

in-line fuse on the power cable near the battery positive

post.


RMS Continuous Power (at 14.4 V, 20 - 200Hz)

• Per channel into 4 ohms (?1% THD+N)

MRP-M1000 ......................................... 600 W x 1

MRP-M500 ........................................... 300 W x 1

• Per channel into 2 ohms (?1% THD+N)

MRP-M1000 ....................................... 1000 W x 1

MRP-M500 ........................................... 500 W x 1

Total MAX Power

MRP-M1000 ............................................. 1900 W

MRP-M500 ............................................... 1100 W

S/N Ratio

• IHF A Weighted, Reference: rated power into

4 ohms .................................................... 100 dBA

Input Impedance

• RCA IN .................................................. 20k ohms

• SP IN .................................................... 40k ohms

Frequency Response (200Hz/ -3dB) ....... 20 - 200 Hz

Crossover Frequency .......... 50 - 200 Hz (-24dB/oct.)

Input Sensitivity (RCA IN) ............................ 0.2 - 4 V

Dimensions

• Width (Heat Sink/Footprint)

MRP-M1000

......... 320 mm (12 - 19/32")/380 mm (14 - 61/64")

MRP-M500

............... 210 mm (8 - 17/64")/270 mm (10 - 5/8")

• Height ..................................... 60 mm (2 - 23/64")

• Depth .................................... 242 mm (9 - 17/32")

Weight

MRP-M1000 ................................................ 4.2 kg
MRP-M500 .................................................. 2.7 k

Feb 04, 2011 | Alpine MRD-M1000 Car Audio Amplifier

3 Answers

Rca Connection


More then rca connection seems to be a problem with speakers

Jun 07, 2008 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

I have a jl audio 500/1. I had the amp professionally installed. The amp played for 2 days and no it has no sound but the power will come on. what could be the problem. I have new rca jacks, 4 guage power...


Go back to where you got it installed and ask them to fix it.

If you don't want to do that I would recommend going to another good car audio shop and getting them to check it out.

You can test it yourself by hooking up an iPod to it using a Headphone to RCA cable.. test at low volume first.

Dec 31, 2010 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

I have a jl 500.1 and a 8w7. The sub is playing but not really it will play sometimes but most of the time i am getting almost nothing. Am i using the wrong settings or a bad connection or blown sub?


Sounds like a bad rca connection. You need both rca jacks to be plugged in from your head unit, both left and right or you will not have full power you'll have half power to your sub/subs. Check your sub with a volt meter and see what it reads. Make sure if your head unit has a sub volume make sure it's turned up. Alot of people don't realize they have a seperate subwoofer volume on there deck and it's set to low, so check that. You could have bad rca cables. If all that is ruled out(best way by trying a different amp) the amp itself might be having problems. Don't think it would be in protect mode either.
Let me know if you have'nt allready.

Nov 14, 2010 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

Weak rear left amp output?


hey whats up bud i got an ALPINE V-POWER MRP-M350 these amps are great go to a walmart od any music shop buy a set of R.C.A cables that plug into your amp than that Ys off to a single connection its a male cable that run a set from the back of your cd player heres the trick ONLY PLUG YOUR BLACK COLORED RCA INTO HEAD UNIT MAKE SURE YOU RAP THE RED ONE WITH TAPE OR GET A RUBBER CAP TO PUT OVER IT SO YOU DONT GET ANY STATIC FREQUENCIES COMING OUT OF THE RED ONE THAN RUN THAT SET TO YOUR AMPLIFIER AND AGAIN ONLY TIE INTO THE LEFT CHANNEL OF YOUR AMPLIFIER.... Hope you know wnat i mean by that Y adapter ther is 2 prongs that tie into amplifier than it splits into 1 were your rca cables will plug into just that one thats how you bridge these confusing amps.... TRUST ME BOTH SUBS WILL SLAM HARD I RUN 2 JL AUDIO OFF OF MINE NO PROBLEM.... WRITE BACK TO ME IF YOU HAVE ANY PROBLEMS OR WHEN YOU GET IT HOOKED UP MY EMAIL ADDRESS IS gordo8785@yahoo.com hope to hear from you soon...

Dec 27, 2008 | Alpine MRP-M350 Car Audio Amplifier

2 Answers

Pioneer 6300 F


firstly, you might want to check if the resistance of your speakers (out-of-circuit) are in specs using an ohmmeter. If it's rated 4-ohms then it should be reading near 4-ohms resistance otherwise it is damaged.
secondly, if the amps can be powered 'on' make sure that it has no dc voltage in the outputs. If there is a signal source an AC voltage will dance the meter pointer which indicates that your amp is OK. Only then can you reconnect your speakers (not the damaged speakers duh!).
cheers!

Oct 13, 2008 | Pioneer GM-6300F Car Audio Amplifier

2 Answers

Protect Mode with RCA's


It sounds like you have some DC voltage on the RCA input.

You need to figure out if the problem is coming from the head unit or if it is in the amplifier.

If you have a voltage meter, you can use it to find out very quickly.

Set the meter for DC and for a max level of more than 12 volts. Most meters I use have a 30 volt level. That would be a good setting.

Take the black lead and make sure it is grounded to the chassis of the car or to the ground of the power terminal, be careful and make sure it does not touch anything else.

With the RCA cable disconnected put the red lead on the inner part of the RCA cable and see if there is any DC voltage and then check the ground or outer part of the cable. Do the same for the other channel as well.

It should be very close to zero volts. A couple of millivolts is fine to. Any voltage here will cause the amplifier to go into protect mode, which is what is happening to you. You will then need to have the head unit serviced.

If you have a Pioneer head unit, I have seen many of them with an open ground fuse for the RCA jack. That fuse is a surface mounted fuse and is very small and hard to locate on the main board of the radio. If you do have a Pioneer head unit the voltage may seem OK, but you will have an open ground, but that normally does not put the amp into protect. It makes the audio sound very weak and you would have a loud hum. I can help you with that if it turns out to be the problem.

If the voltage on both the RCA leads is OK, then you need to check the amplifier.

You can put the meter lead on the ground of the RCA jack on the amplifier, if you have anything abnormal there, you have a problem in the amplifier. Be careful checking this because you can easily touch the lead to the chassis of the amplifier at the same time as the RCA ground. Most of the time, if yu have a problem in the amplifier like the one you are having, this check of the RCA ground will result in some DC voltage on it. If it still checks OK, then put the lead into the RCA ground and check the positive part of it. You may need to move the lead around a little to get it to touch the metal inside, it is on the bottom part of the hole inside the jack.

I think you will find that you have some voltage on the RCA inputs of the amplifier. To fix this properly you will need to take it in to be serviced.

Sometimes you can ground the RCA jack ground somehow with a jumper wire and then turn the system on with the RCA cable plugged in and it will seem normal. But you do not want to do that as a repair, only to see if the amp will play. If it does play, you know that the problem is in the pre-amp of the amplifier. That would be the only reason to connect an external ground to the RCA jack. You still have a problem in the amplifier. If it does not play normal, you still have a problem in the amplifier if there was some DC on the RCA jack.

Sorry this answer is so long, but the problem you are having will require service of one of your units, you just need to know which one it is. If your inputs get grounded, you will not have the amp go into protect, you just won't hear anything.

Let me know if you need more help and if this was helpful to you a good rating is always appreciated.

Jun 22, 2008 | Power Acoustik TS1440-2 Car Audio...

1 Answer

Ignition noise


The sounds you are hearing are usually due to one of two things:
  1. The RCA preamp cables between the head unit and amp are either run too close to the +12V line or the connectors are touching a metal object.
  2. The ground connection is too long or not as clean/solid as it should be.
To fix problem #1, just make sure the RCA lines are on one side of the vehicle and the power is on the other.

To fix problem #2, make sure your ground connection to your amp is as short as possible (ideally <2ft) and is tied to a clean (ie no dirt, paint, grease) point on the chassis.

If the issue still exists, search the web for a ground loop isolator.

Apr 04, 2008 | Jl Audio 500/5 Car Audio Amplifier

1 Answer

Alpine


If this occurs with the head unit plugged directly into the amp (no signal processors inline, you probably have open shields on the head unit.

To check the shield ground, disconnect all RCA cables from the head unit and measure the resistance between the RCA shield on the head unit and the case of the head unit. It should read ~0 ohms.

Dec 03, 2007 | Car Amplifiers

2 Answers

RCA INPUT JACKS


did it work well before?is it new? try moving the rca's and se if you hear any thing?

Jun 30, 2007 | MA Audio HK802SX Car Audio Amplifier

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