Mekede M6 Pro 2k + Hertz speakers + JBL 5ch = hum/whine ??? Help please

[johnnyb_aussie]

Installed the m6pro plus 2k, was super happy with it... until i installed hertz speakers all round and jbl 5ch amp.

There is feedback hum/whine through the speakers. This hum/whine was is not present if I connect the speakers to the headunit directly using the headunit built in amp.
(ran this way for 5months)

The hum/wine only occurs when a rca is connected to the headunit, this occurs on the front rca, rear rca and sub out rca, the hum/whine affects all output rca's.

With the rca's disconnected from the headunit there is no hum/whine from the amp/speakers (amp powered on by headunit just no rca's to headunit),

Only once a rca is connected to the headunit does the hum/whine occur, occurs on all speakers and all channels regardless of rca used (front/rear/sub).

if rca to front right only connected to the headunit, thats the only channel that he hum/whine occurs on. If rca to front left is connected to headunit thats the only channel the whine occurs on... so the whine is directly related to the rca being connected to the headunit.

Anyone connected their m6pro to a external amp using the rcas?

i have tried disconnecting all aux leads - reverse camera, wifi, 5g, mic, gps to eliminate those from being the cause.

Anyone a) experience this b) using the m6pro 2k connection to external amps?

My wiring is top notch, high quality 12gauge ofc, 4gauge power+ground, high quality rcas, all wire ends high quality connectors with heatshrink and attention to detail. Built many car audio setups over the years, first time ever had a hum/whine.

Thoughts? thanks guys

thanks.

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[audiobaun 5,000+ posts]

Might even try to pull the Fuse on the HU to power it down or HU wiring harness, and put RCAs in and wait a little bit put back in to see if it resets back to normal settings even? I had do that with a Blaukpkt. HU before, and a newer Kenwood one in the past. May even look to see if there is a Firmware update out on that HU may solve the issues as well?

 

[johnnyb_aussie]

Might even try to pull the Fuse on the HU to power it down or HU wiring harness, and put RCAs in and wait a little bit put back in to see if it resets back to normal settings even? I had do that with a Blaukpkt. HU before, and a newer Kenwood one in the past. May even look to see if there is a Firmware update out on that HU may solve the issues as well?

thanks will have a look and see if anything i do changes the whine. As the unit boots up the whine changes, before the bootlogo shows the whine is really loud, then it boots fully and the whine changes to a lower volume and lower tone, weird.. super annoying after spending so much cash on all that new gear and the hours of sound deading and foaming and rattle/vibe reduction... once i put music on man does it sound superb.. its the best sound caraudio setup ive built, all that work on sound deading and fastrings and hertz speakers was worth it..

 

[audiobaun 5,000+ posts]

thanks will have a look and see if anything i do changes the whine. As the unit boots up the whine changes, before the bootlogo shows the whine is really loud, then it boots fully and the whine changes to a lower volume and lower tone, weird.. super annoying after spending so much cash on all that new gear and the hours of sound deading and foaming and rattle/vibe reduction... once i put music on man does it sound superb.. its the best sound caraudio setup ive built, all that work on sound deading and fastrings and hertz speakers was worth it..

That is strange there. Thats what Ive encountered with low voltage before . That Kenwood needed a Firmware update and that fixed that one when it was BNEW Kenwood Excelon KDC-X996 unit