What could cause this?

AdamRacer · 06-05-2015, 06:49 AM

Hi Audio guys,

I am in need of your help to see what has recently gone wrong with my system. I installed everything myself and have had amazing sound for over 2 years now.

These are the components at a glance for reference:

Pioneer AVH-P4400BH head unit
Boston acoustics 4 channel amp
Boston acoustics mono sub amp
2 sets of Polk audio db components.
JL 10w3v3 subwoofer

So I was driving home from work yesterday and about 15 minutes into the drive all of a sudden my JL sub made a loud pop and quit working. I didn't have time to research it last night so I was going to wait till tonight and turned the sub off from the head unit. I was driving into work this morning and about 10 minutes into the drive this very loud hum/Buzz sound constantly. This sound occured very loud regardless of the volume and the only way I could get it to stop was to hit the "off" button on the head unit. The mute did not work to stop the hum.

Does this sound familiar as to what is going wrong in my system? I am thinking it must be the head unit since it has caused this to 2 separate amps within a day. Could this have caused damage to my components?

Any advice would be greatly appreciated!

YzGyz · 06-05-2015, 11:34 AM

Loose wires? I would check all the wires again. Worst to worst, isolate each individual piece of equipment and test them with a known working source.

YzGyz

AdamRacer · 06-05-2015, 01:23 PM

Quote:

Originally Posted by YzGyz

Loose wires? I would check all the wires again. Worst to worst, isolate each individual piece of equipment and test them with a known working source.

YzGyz

Thanks. I'll be looking into all the connections this weekend. I'm thinking its the preamps in the head unit that might be going bad.

RonRizz · 06-05-2015, 02:32 PM

or an rca cable was damaged.

YzGyz · 06-05-2015, 03:46 PM

I would check the Head unit last since it requires the most work to get to. Everything else is "exposed" compared to the back of the Head Unit.

YzGyz

lj909 · 06-05-2015, 04:16 PM

You need to make sure your amps are getting the proper voltage and grounded well. Then you can check the voltage of the pre amp at the amp just use a volt ohm meter.

SouthArk370Z · 06-05-2015, 06:36 PM

The pop and loss of subwoofer could be: amp failure, driver failure, or a wiring problem.

The hum is most likely a wiring (grounding) problem - possibly a a damaged coax cable as per RonRizz.

Wiring seems to be the common element here; that's where I'd start.

AdamRacer · 06-05-2015, 10:49 PM

Thank you everyone for your advice. I will be working on it tomorrow and will respond with what I find.

AdamRacer · 06-06-2015, 09:14 AM

After some testing on another sub in my other vehicle, I found that it is my mono amp that failed.

Thank you all for your help!

06-05-2015, 06:49 AM	#1 (permalink)
AdamRacer Enthusiast Member Join Date: Jan 2012 Location: North Florida Posts: 316 Drives: '12 MBlue 370z 6sp Rep Power: 13	What could cause this? Hi Audio guys, I am in need of your help to see what has recently gone wrong with my system. I installed everything myself and have had amazing sound for over 2 years now. These are the components at a glance for reference: Pioneer AVH-P4400BH head unit Boston acoustics 4 channel amp Boston acoustics mono sub amp 2 sets of Polk audio db components. JL 10w3v3 subwoofer So I was driving home from work yesterday and about 15 minutes into the drive all of a sudden my JL sub made a loud pop and quit working. I didn't have time to research it last night so I was going to wait till tonight and turned the sub off from the head unit. I was driving into work this morning and about 10 minutes into the drive this very loud hum/Buzz sound constantly. This sound occured very loud regardless of the volume and the only way I could get it to stop was to hit the "off" button on the head unit. The mute did not work to stop the hum. Does this sound familiar as to what is going wrong in my system? I am thinking it must be the head unit since it has caused this to 2 separate amps within a day. Could this have caused damage to my components? Any advice would be greatly appreciated!

06-05-2015, 11:34 AM	#2 (permalink)
YzGyz A True Z Fanatic Join Date: Jun 2013 Location: Houston Posts: 1,449 Drives: 2010 Nismo Rep Power: 62	Loose wires? I would check all the wires again. Worst to worst, isolate each individual piece of equipment and test them with a known working source. YzGyz __________________ http://www.the370z.com/members-370z-...gyzs-turn.html YzGyz

06-05-2015, 02:32 PM	#4 (permalink)
RonRizz A True Z Fanatic Join Date: Aug 2011 Location: Pine grove, Pa Posts: 2,134 Drives: 2 feet, 3 pedals Rep Power: 6774	or an rca cable was damaged. __________________ P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals

06-05-2015, 03:46 PM	#5 (permalink)
YzGyz A True Z Fanatic Join Date: Jun 2013 Location: Houston Posts: 1,449 Drives: 2010 Nismo Rep Power: 62	I would check the Head unit last since it requires the most work to get to. Everything else is "exposed" compared to the back of the Head Unit. YzGyz __________________ http://www.the370z.com/members-370z-...gyzs-turn.html YzGyz

06-05-2015, 04:16 PM	#6 (permalink)
lj909 Track Member Join Date: May 2014 Location: Riverside Posts: 584 Drives: 40th 370Z Rep Power: 12	You need to make sure your amps are getting the proper voltage and grounded well. Then you can check the voltage of the pre amp at the amp just use a volt ohm meter. __________________ PW 07 HR350Z R.I.P. Totaled by 82yr old woman 2010 40th Anniversary 370Z

06-05-2015, 06:36 PM	#7 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	The pop and loss of subwoofer could be: amp failure, driver failure, or a wiring problem. The hum is most likely a wiring (grounding) problem - possibly a a damaged coax cable as per RonRizz. Wiring seems to be the common element here; that's where I'd start. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

06-05-2015, 10:49 PM	#8 (permalink)
AdamRacer Enthusiast Member Join Date: Jan 2012 Location: North Florida Posts: 316 Drives: '12 MBlue 370z 6sp Rep Power: 13	Thank you everyone for your advice. I will be working on it tomorrow and will respond with what I find.

06-06-2015, 09:14 AM	#9 (permalink)
AdamRacer Enthusiast Member Join Date: Jan 2012 Location: North Florida Posts: 316 Drives: '12 MBlue 370z 6sp Rep Power: 13	After some testing on another sub in my other vehicle, I found that it is my mono amp that failed. Thank you all for your help! madwi and YzGyz like this. Last edited by AdamRacer; 06-06-2015 at 12:54 PM.