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Discussion Starter · #1 ·
I need some help trouble shooting some noise. First, the install: I have focal es 165 kx2 mids and tweets up front, focal es165kx2 mids in rear as rear fill, 2 JL 13tw5 subs under the back seat, Helix dsp.3, Navtv zen avbgm for oem integration, JL HD600.4 powering front and rear mids, JL HD750.1 for the subs, and JL XD 200.2 for the tweets.

I originally had a RF dsr-1 as my dsp and the system worked pretty well but one of the channels started to shut off randomly so I figured I would take the next step down the rabbit hole and got a Helix DSP.3.

After installing the the helix the truck developed a very noticeable noise floor that I can still hear even if I have the the sensitivity of the Helix almost turned all the way down. There is also an alternator whine that I can't figure out. I've tried the factory amp ground, I've tried grounding the helix with the amps and all of the various switches on the Helix to no avail. I can get it to go mostly away if I turn the sensitivity of the Helix all the way down and the amp gains down significantly but then I can't get the volume to a decent level. Here is a YouTube video of the noise. Around the 18 second mark you can hear when I mute the channels on the Helix and it gets quiet. You can also hear the the alternator whine when I give it a little gas.


Sometimes the noise floor randomly gets more quiet and I am not sure why. I can't hear anything in the car turning on or off.

Some problems: the nav tv zen zvb gm seems to have been rushed to market. The optical out worked at first but they have had some problems and have now disabled it with firmware updates so I can't go that route. When I ran the navtv to the dsr 1 I didn't have these troubles but I am so invested in this now I don't want to go back.

The Navtv signal doesn't clip at max volume using an o scope (around 4 volts out). The helix clipping detector doesn't alert with the sensitivity turned all of the way up nor does it clip at full volume with an o scope. When I set the amps at a level slightly below clipping the noise floor and alternator whine are very noticeable but the systems ROCKS.

The amps are grounded on the back wall to the seat mounts. I would normally try a different ground for the amps but since I didn't have the problem before the helix I don't think that is the problem.

One last thought, I don't know if it is the difference in quality between the HD amps and the XD amps but the whine and most of the noise seem to come from the tweeter amp (XD). Only reason I went with the XD is because I didn't need to run that much power to the tweets. I will say the every channel on the HD amps except for the front right is without noise (and that noise is almost silent). I haven't even bothered trying to RTA before I get this noise issue fixed but I am really getting tired of driving around without a back seat (going on 3m months when you count install time). Let me know your comments and suggestions, THANKS!
 

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I need some help trouble shooting some noise. First, the install: I have focal es 165 kx2 mids and tweets up front, focal es165kx2 mids in rear as rear fill, 2 JL 13tw5 subs under the back seat, Helix dsp.3, Navtv zen avbgm for oem integration, JL HD600.4 powering front and rear mids, JL HD750.1 for the subs, and JL XD 200.2 for the tweets.

I originally had a RF dsr-1 as my dsp and the system worked pretty well but one of the channels started to shut off randomly so I figured I would take the next step down the rabbit hole and got a Helix DSP.3.

After installing the the helix the truck developed a very noticeable noise floor that I can still hear even if I have the the sensitivity of the Helix almost turned all the way down. There is also an alternator whine that I can't figure out. I've tried the factory amp ground, I've tried grounding the helix with the amps and all of the various switches on the Helix to no avail. I can get it to go mostly away if I turn the sensitivity of the Helix all the way down and the amp gains down significantly but then I can't get the volume to a decent level. Here is a YouTube video of the noise. Around the 18 second mark you can hear when I mute the channels on the Helix and it gets quiet. You can also hear the the alternator whine when I give it a little gas.


Sometimes the noise floor randomly gets more quiet and I am not sure why. I can't hear anything in the car turning on or off.

Some problems: the nav tv zen zvb gm seems to have been rushed to market. The optical out worked at first but they have had some problems and have now disabled it with firmware updates so I can't go that route. When I ran the navtv to the dsr 1 I didn't have these troubles but I am so invested in this now I don't want to go back.

The Navtv signal doesn't clip at max volume using an o scope (around 4 volts out). The helix clipping detector doesn't alert with the sensitivity turned all of the way up nor does it clip at full volume with an o scope. When I set the amps at a level slightly below clipping the noise floor and alternator whine are very noticeable but the systems ROCKS.

The amps are grounded on the back wall to the seat mounts. I would normally try a different ground for the amps but since I didn't have the problem before the helix I don't think that is the problem.

One last thought, I don't know if it is the difference in quality between the HD amps and the XD amps but the whine and most of the noise seem to come from the tweeter amp (XD). Only reason I went with the XD is because I didn't need to run that much power to the tweets. I will say the every channel on the HD amps except for the front right is without noise (and that noise is almost silent). I haven't even bothered trying to RTA before I get this noise issue fixed but I am really getting tired of driving around without a back seat (going on 3m months when you count install time). Let me know your comments and suggestions, THANKS!
What kind of rca's are you using, coaxial or twisted pair?
 
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Considering the noise drops when you lower the levels in thr helix, it sounds like it's not the Helix, but something before it. Probably the zen, or just the install in general considering there is alternator whine. What happens if you remove the rca cables from thr Helix input? If the noise goes away, it's not the dsp and troubleshooting needs to move elsewhere.
 

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Discussion Starter · #6 ·
Considering the noise drops when you lower the levels in thr helix, it sounds like it's not the Helix, but something before it. Probably the zen, or just the install in general considering there is alternator whine. What happens if you remove the rca cables from thr Helix input? If the noise goes away, it's not the dsp and troubleshooting needs to move elsewhere.
I will try that tomorrow and reply.
 

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Most likely the xd amp based on your observations. I would just run your front tweets and miss bad off the hd for now. And see if the whine goes away, than you isolate it to the xd. You can also check your grounding points resistance using a volt meter. Caraudiofab has a good video on how to do that.
 

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I need some help trouble shooting some noise. First, the install: I have focal es 165 kx2 mids and tweets up front, focal es165kx2 mids in rear as rear fill, 2 JL 13tw5 subs under the back seat, Helix dsp.3, Navtv zen avbgm for oem integration, JL HD600.4 powering front and rear mids, JL HD750.1 for the subs, and JL XD 200.2 for the tweets.

I originally had a RF dsr-1 as my dsp and the system worked pretty well but one of the channels started to shut off randomly so I figured I would take the next step down the rabbit hole and got a Helix DSP.3.

After installing the the helix the truck developed a very noticeable noise floor that I can still hear even if I have the the sensitivity of the Helix almost turned all the way down. There is also an alternator whine that I can't figure out. I've tried the factory amp ground, I've tried grounding the helix with the amps and all of the various switches on the Helix to no avail. I can get it to go mostly away if I turn the sensitivity of the Helix all the way down and the amp gains down significantly but then I can't get the volume to a decent level. Here is a YouTube video of the noise. Around the 18 second mark you can hear when I mute the channels on the Helix and it gets quiet. You can also hear the the alternator whine when I give it a little gas.


Sometimes the noise floor randomly gets more quiet and I am not sure why. I can't hear anything in the car turning on or off.

Some problems: the nav tv zen zvb gm seems to have been rushed to market. The optical out worked at first but they have had some problems and have now disabled it with firmware updates so I can't go that route. When I ran the navtv to the dsr 1 I didn't have these troubles but I am so invested in this now I don't want to go back.

The Navtv signal doesn't clip at max volume using an o scope (around 4 volts out). The helix clipping detector doesn't alert with the sensitivity turned all of the way up nor does it clip at full volume with an o scope. When I set the amps at a level slightly below clipping the noise floor and alternator whine are very noticeable but the systems ROCKS.

The amps are grounded on the back wall to the seat mounts. I would normally try a different ground for the amps but since I didn't have the problem before the helix I don't think that is the problem.

One last thought, I don't know if it is the difference in quality between the HD amps and the XD amps but the whine and most of the noise seem to come from the tweeter amp (XD). Only reason I went with the XD is because I didn't need to run that much power to the tweets. I will say the every channel on the HD amps except for the front right is without noise (and that noise is almost silent). I haven't even bothered trying to RTA before I get this noise issue fixed but I am really getting tired of driving around without a back seat (going on 3m months when you count install time). Let me know your comments and suggestions, THANKS!
Does your vehicle chimes go through the speakers? If it does, does the navtv have a way to turn them off or lower the volume of them. My 2019 f150 has chimes that go through the speakers and I’m having the noise floor issue also. I also have a dsp.3. I went hec usb in to the dsp. I still have the noise. The truck turns everything on when I unlock it so it’s ready to play chimes. A good way to find if it’s something before the dsp is hook up your phone or music player directly to the dsp and bypass the navtv.
 

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Try some twisted pair cables. I think the XD amps somehow cause noise when paired with dissimilar amps, twisted pair rca's on the non-XD amps seems to fix the problem, maybe even if you use one set for the XD amp. It's worth a try.
 

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Discussion Starter · #13 ·
Are you having any issues with the NavTV unit?

I found one BNIB from someone who never installed it.
Not really. You can’t use the toslink but as long as you ground it in the same place as the amps rather than than the Bose wire harness you should be good. I have one of the later manufactured ones. I know the first ones had a bunch of problems and they are currently redesigning I assume for toslink so take that with a grain of salt. Nice aspect tho is that there is no clipping at max volume through the unit. This is specific for the GMC 1500 trucks. I know the other cars are going aren’t having problems.
 
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