New head unit, now sub "thumps" when turning on...

[bgrattan]

I just put a Pioneer AVH-1440NEX head unit in my '06 Limited to get CarPlay and a backup camera. Most things work well, but a few seconds after I turn the key on (and the head unit powers up) the sub "thumps" once--kind of like when you plug something into an amp that is already on. I'm assuming this has to do with the timing of the sub amp turning on. I used the "system control" wire (blue/white) going to what I believe is the amp's "power on" signal.
If I connect the amp's "power on" to the switched +12V instead, so that it should turn on as soon as I turn the key on, do you think I would get rid of the "thump?"
It didn't have this problem with the stock head unit.

 

[Hamfisted]

The factory amp only likes a 5v signal for startup, most aftermarket head units provide a 12v signal. So you have to install the 12/5 resistor to cut down the power to 5v to get rid of the thump.

 

[bgrattan]

Good to know. Thanks.

 

[Ron1978]

I just put a Pioneer AVH-1440NEX head unit in my '06 Limited to get CarPlay and a backup camera. Most things work well, but a few seconds after I turn the key on (and the head unit powers up) the sub "thumps" once--kind of like when you plug something into an amp that is already on. I'm assuming this has to do with the timing of the sub amp turning on. I used the "system control" wire (blue/white) going to what I believe is the amp's "power on" signal.
If I connect the amp's "power on" to the switched +12V instead, so that it should turn on as soon as I turn the key on, do you think I would get rid of the "thump?"
It didn't have this problem with the stock head unit.

Do not use loudness on the radio, leave it off, I just installed a whole system in my f250 and the amp instruction says do not use loudness setting in radio. See if it helps

 

[bgrattan]

Thanks. I'm pretty sure I already have it off, but I'll confirm that.

 

[1955moose]

Well I'm going to throw my 2cents in here. Whenever I hooked up an amp, whether main or sub, the hot lead, yellow usually, goes straight to the positive terminal of battery. The turn on/off wire goes to a switched 12 volt source. Is that the way you wired it? Sounds like you did, but just checking. Amplifier hots should always go straight to the battery, with a 30-80 amp fuse in between depending on wattage.

Sent from my N9131 using Tapatalk

 

[Ron1978]

Well I'm going to throw my 2cents in here. Whenever I hooked up an amp, whether main or sub, the hot lead, yellow usually, goes straight to the positive terminal of battery. The turn on/off wire goes to a switched 12 volt source. Is that the way you wired it? Sounds like you did, but just checking. Amplifier hots should always go straight to the battery, with a 30-80 amp fuse in between depending on wattage.

Sent from my N9131 using Tapatalk

This is very correct, I run from battery 8" from it a 100 amp fuse then straight to the amp, then blue remote wire to amp from radio, make sure you have a good ground with no paint between the connection, Grounding is key to a strong setup

 

[bgrattan]

Thanks guys. I'll check the power connection, it may be going to the switched line.

 

[Trainmaster]

Hamfisted said it. The turn-on signal must be 5 volts, not 12 volts. You need a resistor. Lots about this on line.

 

[Aspen03]

You can use an AXXESS AX-CAM6V or a couple of 1k ohm resistors to step voltage down to eliminate it. The part from axxess works great