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2012 TL White Noise Aftermarket Amp

 
Old 04-13-2019, 10:37 AM
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2012 TL White Noise Aftermarket Amp

All - Am a newbie to car audio. Had a local audio shop install aftermarket amp (GM-DX975 Pioneer) speakers (hertz dsk165.3, DCX690.3) and LC7i Six Channel Converter (Audio Control) and 10" PIoneer sub (TSD10D4). Am getting a constant white noise through the speakers that doesn't go away. The shop set all the gain properly on the amp and was confused as to where the noise was coming from.

I've read several folks bypassed the factory amp but it's still confusing as to whether I need to keep the center speaker running through the factory amp for HFL and Bluetooth control.

I'm reaching out to other local audio shops to see if they can help but would appreciate opinions on what to recommend to them.

Thanks for any help.
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Old 04-15-2019, 12:36 PM
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Originally Posted by cuhockey32 View Post
All - Am a newbie to car audio. Had a local audio shop install aftermarket amp (GM-DX975 Pioneer) speakers (hertz dsk165.3, DCX690.3) and LC7i Six Channel Converter (Audio Control) and 10" PIoneer sub (TSD10D4). Am getting a constant white noise through the speakers that doesn't go away. The shop set all the gain properly on the amp and was confused as to where the noise was coming from.

I've read several folks bypassed the factory amp but it's still confusing as to whether I need to keep the center speaker running through the factory amp for HFL and Bluetooth control.

I'm reaching out to other local audio shops to see if they can help but would appreciate opinions on what to recommend to them.

Thanks for any help.
I tried replying to your PM, but it won't allow me to because your inbox is full.

I was thinking you had alternator whine, in which case getting an amp with differential inputs would likely resolve the issue. I'm not sure if this would solve the white noise, but it wouldn't hurt. I believe there's a jumper inside the LC7i that can be switched to isolate the ground. You could try that and see if it helps. Did they connect all the ground wires to a single point and to bare metal? Did they run the power cable on the left side or right? I believe the audio source wires run along the right side. Not positive.

If I were to do it over, I would have run a pair of RCA cables all the way to the head unit and tapped into the L/R channels up front rather than the trunk. That way the signal would have been cleaner and not be picking up any noise on the trip back to the trunk. However, my amp has differential inputs, so the noise is filtered. Although I do still hear some faint white noise, but the music drowns it out. That could be a gain thing, so be sure they set the gains properly (are you sure they did?)

You do not need the center speaker. The bluetooth, etc voice prompts will play through the L/R speakers.

Here's a 5-channel amplifier with balanced differential inputs: http://www.jlaudio.com/xd700-5v2-car...plifiers-98606

Last edited by mossman77; 04-15-2019 at 12:47 PM.
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Old 04-15-2019, 01:05 PM
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A couple alternatives:

1) Simply swap out the Pioneer amp with one that has balanced differential inputs (e.g. JL xd700-5v2)

2) Keep the Pioneer amp but tap into the INPUTS of the factory amplifier (requires soldering RCA connectors) to obtain a low-level signal, then replace the LC7i with another Audio Control product that has diff inputs (e.g. 6XS crossover or Matrix Plus)

3) Swap out the Pioneer amp for the JL xd700, tap into the factory amp's inputs, and omit the LC7i (connect directly from the factory amp inputs to the xd700)

I don't recall Audio Control having the 6XS or Matrix Plus back when I did my system. I went with the DQDX processor, which has 7-band EQs, but found out pretty quickly that adjusting the knobs on the EQ while trying to tune the system wasn't realistic. I plan on upgrading to either a DM-608 (has computer interface) or another advanced processor that allows adjustments on-the-fly from the driver's seat.
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Old 04-15-2019, 01:14 PM
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FYI, here is the diagram for the amplifier input connector (navigation and non-navigation):

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