Jump to content

Amp went pop, not exactly sure why


Recommended Posts

EDIT: See below for updates

So I purchased the JL Audio C2650 component speaker system. For the amp, I went with a Infinity Primus 6002A. Input source is a JL Audio MBT-RX. No head unit. Output from the MBT-RX goes through a splitter to the Infinity Primus and then to my amp for my subwoofer. I've only been rocking this set up for about a month


My driver's side tweeter and woofer made some funny noises when I turned up the volume (not very loud, but loud) and then just kinda stopped. There's nothing but a very faint hissing noise coming from the component speaker now. I swapped out the wires. The woofer still works when hooked up to the other crossover's output. This is how I've reasoned that a crossover went kaput. I don't have my tools on me, but once I do, I'll be able to extract the crossovers for some more information.


Some symptoms I experienced ever since I first installed the speakers:

- hissing from tweeters; pretty loud; at low volume it'll overpower the music coming from the tweeters

- loud pop if I suddenly turn my car off; I must disconnect my phone from the bluetooth, wait a few seconds, and then turn my car off in order to avoid the pop

- once I hit a high enough volume level (not very loud, but loud) the woofers would go all distorted, even though I've configured the low-pass on the Infinity Primus in accordance to the woofers' frequency response--even choked it up quite a bit


Note that my phone's bluetooth is the thing controlling the volume. I have the gain turned up slightly on both the amps.


I'd love to hear y'alls' input.



Updates -- seems like it's the amp 😕


So I finally tore into the Jeep. I checked the capacitor and the two resistors of the crossover in question. Lo and behold, nothing seemed wrong. Everything seemed correct according to the spec. I even swapped the I/O of the crossovers and confirmed that they both work. I checked the input the crossover was getting from my Infinity Primus 6002A. For the working side, the voltage read ~40mV. For the not working side, the voltage read ~10mV. I checked the output of the amp, and the values were the same. For some reason the right side output is 4x the mV of the left side. No clue why. I've only had it about two months now, so it's under warranty. Any ideas?

Edited by Kaelinator
Further inspection revealed more questions than sanswers
Link to comment
Share on other sites

distortion killer of all speakers and crossovers.

  • Like (+1 Rep) 1




Pioneer P99RS
Ampere 3800
2-Ampere 125/4
4-6.5 inch Hertz HSK XL Mids
4-8 inch JL Audio ZR Midwoofer

2-5.25 Satori Mids
2-Morel Tweeters, 2 Hertz Milles 3 inch on A pillars
2-Hertz Silk tweeters
DC Audio Level 5/12
Skyhigh Wire
Mechman 320
XS Power D3100

MO Funniest Thread of the Year 2013: http://www.stevemead...dy-being-a-pos/

Link to comment
Share on other sites

On 9/2/2021 at 3:23 AM, Dafaseles said:

I think your phone or the mbt-rx is sending a distorted signal to the amplifier to begin with. 

How did you go about setting the gains on your amps? 


The amps have a little dial on them that I can adjust with a screw driver, just like the low and high pass. Didn't think I had set it very high, but could that've caused it?



On 9/2/2021 at 3:45 PM, Soccerballzs said:

distortion killer of all speakers and crossovers.


What is? the mbt-rx?

Link to comment
Share on other sites

  • Kaelinator changed the title to Amp went pop, not exactly sure why
9 minutes ago, Kaelinator said:

Correct. JL MBT-RX. Gain was set using the dial on the Primus 6002A. P.S. please see the update in the original post!

Can you take a picture of your settings on the amplifier and upload it? Just take a picture of that whole side of the amplifier with the crossovers and the gain knobs. That will help us

2011 Chevy Silverado under construction

My build log here. Check it out! 


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Who's Online   0 Members, 0 Anonymous, 145 Guests (See full list)

    • There are no registered users currently online
  • Create New...