Topic: Pop sound when turning off the HU

[gocitygo]

Sifus sekalian, I have a problem with my current active setup.  Whenever I'm turning off the HU, I can hear a small pop sound from my tweeter and it is very irritating.   

What are the possible causes & solutions?

Setup configuration:

HU --> 2CH Amp (Tweeter) & 4CH Amp (Midbass & Sub)

[netken]

u need a delay in the amp power switching off and on ...

and maybe a helix baby cap ... lol ...

the installer would prolly be able to solve the problem for u .. :D

[gocitygo]

thanks.  in the first place, is this due to defective amp/hu or compatibility issue?

saw this device called "delayed amp turn off circuit", http://www.davidnavone.com/amp.htm where to get it?  if not too difficult, will DIY.

[Bert]

Basically its a small capacitor on your remote line. So when you turn it on, it will delay a while before turnig it on and delay when turnign it off.

[gocitygo]

Thanks.

Found the simple delay circuit @ http://www.crutchfield.com/S-DaooYQl89sn/tech/kb327.html.

Will try it out when goyang kaki.

[gocitygo]

Built and tried the delay circuit and still got the pop sound.   

Further checking also found my midbass, which powered by another amp also got the pop sound.  Something that I missed out earlier, could be overwhelmed by the annoying sound from the tweeter.

Done some troubleshooting.  I have temporary disable the midbass amp by unplugged the remote line and still without any success, pop sound still can be heard from the tweeter.  Next, I unplugged the RCA from the tweeter amp, then the pop sound gone  .  So, I guess the culprit could be my HU  .  What could possible go wrong?  Any remedy?

[nghooipeng]

Get the Stinger SPS http://www.stingerelectronics.com/prodDetail.asp?strID=272

[GRexer]

Is it possible that u might be overloading the remote out from your HU? How many amps do you have and do you daisy-chain the remote wire?

[gocitygo]

Is it possible that u might be overloading the remote out from your HU? How many amps do you have and do you daisy-chain the remote wire?

i have 2 amps, Helix B2 (driving tweeter) and Soundstream VGA500.4(driving midbass and sub)

the HU remote line is connected directly to the VGA.  the B2's remote line is tack on in between the one from the HU to VGA amp.

as hilited above, even i have temporary remove the remote line for VGA (only left with the B2) i can still hear the pop sound from the tweeter. 

[Oldskolboyz]

check your ground cable, could be lose some where or not properly solder to car body... why not u use relay..

[craziechild]

i remember solving mine with a relay and a diode on the remote line...

but... sifu vegatron told me tht this is not a normal solution... normally installer will use a delay switch...

but well... it does solve mine...

[gocitygo]

check your ground cable, could be lose some where or not properly solder to car body... why not u use relay..

thanks for the input.

actually my installer tried using relay and also without any success.

[calvinhpk]

i heard from somewhere that some batch of Clarion HX-D2 have pop problems
dunno true or not

[Oldskolboyz]

if like what calvin said, try use others HU.. ?

[gocitygo]

i heard from somewhere that some batch of Clarion HX-D2 have pop problems
dunno true or not

any D2 owners can confirm this?

if yes, how you fix the problem.

[netken]

i heard from somewhere that some batch of Clarion HX-D2 have pop problems
dunno true or not

first time hearing this too ....

[aurie]

first time hearing this too ....

same goes here...:(

[gocitygo]

Thanks for helping.  Issue solved.

Problem is due to HU/DC-DC converter like what pointed out by Calvin tailo.

Sent the HU back to service center and kautim.

[calvinhpk]

congrats!!