HK Underseat Subwoofers still not working..

jaxbmr · 02-03-2023, 08:26 PM

Please help! 2015 BMW M235i..

It’s been over 6 months since my HK subwoofers last worked. Both subwoofers died at the exact same time, they didn’t make any noise but they just shut off. I had people telling me it was my amp.. so I just recently sent it for a brand new bavsound revenant pro amplifier and full stage 1 speakers. Was disappointed to test it out and see my subwoofers were still not working.. I checked my error codes and all I have is a “Central Fault Memory Full”. What’s going on??

kschwiggy · 02-06-2023, 10:27 PM

I'm having the same problem... 2016 M235 and my subs have no output. I recently installed the Revenant Pro and no luck. I have the Ghost subs on order and will swap them in to see if the HK subs just died.

jaxbmr · 02-06-2023, 10:30 PM

Quote:

Originally Posted by kschwiggy

I'm having the same problem... 2016 M235 and my subs have no output. I recently installed the Revenant Pro and no luck. I have the Ghost subs on order and will swap them in to see if the HK subs just died.

Thanks bro. Please let me know. I have an appointment at bmw tomorrow as well.

mecodoug2 · 02-07-2023, 02:21 PM

Suggest taking a resistance measurement from the amp end (with speaker wires unplugged) to see if the voice coils are shot. If you get a number near infinity, they are shot. If you get an ohm or a few ohms they are good.

jaxbmr · 02-08-2023, 01:05 PM

Quote:

Originally Posted by jaxbmr

Thanks bro. Please let me know. I have an appointment at bmw tomorrow as well.

Quote:

Originally Posted by kschwiggy

I'm having the same problem... 2016 M235 and my subs have no output. I recently installed the Revenant Pro and no luck. I have the Ghost subs on order and will swap them in to see if the HK subs just died.

BMW was no help. Left me car there for 2 days and just got a call and they said they can’t do anything because it’s an aftermarket amplifier, even though the amp clearly isn’t the problem..

kschwiggy · 02-09-2023, 08:57 AM

Sorry to hear that. My Ghost subs arrive today, but I may not be able to install until tomorrow. I'll follow up after I do.

jaxbmr · 02-09-2023, 11:38 AM

Quote:

Originally Posted by kschwiggy

Sorry to hear that. My Ghost subs arrive today, but I may not be able to install until tomorrow. I'll follow up after I do.

Sweet. Thank you.

kschwiggy · 02-10-2023, 09:16 AM

I swapped in the Bavsound Ghosts. There seems to be more bass now, but not a dramatic difference. Sound in the car still seems very treble-heavy, even if I set treble to -3 and bass to +3 (the max settings that Bavsound recommends. I also felt the subwoofer grilles for vibration while playing, and there is some, but not as much as I expected. That said, the subs are brand new, so I will need to break them in over the next few days.

jaxbmr · 02-10-2023, 11:59 AM

Quote:

Originally Posted by kschwiggy

I swapped in the Bavsound Ghosts. There seems to be more bass now, but not a dramatic difference. Sound in the car still seems very treble-heavy, even if I set treble to -3 and bass to +3 (the max settings that Bavsound recommends. I also felt the subwoofer grilles for vibration while playing, and there is some, but not as much as I expected. That said, the subs are brand new, so I will need to break them in over the next few days.

That’s awesome, yeah I have seen some people add sound deadening on the inside for more direct punch. But I believe bavsound did mark a 12 hours break in before they go crazy. But, Was the stock subwoofers the problem as of no bass? They haven’t cut out at all? They still work after like 5 minutes or under alittle pressure? Please let me know bro! Thank you

kschwiggy · 02-11-2023, 01:58 PM

Yeah they seem to be working fine. I about 3 hours on them this morning, and will update after I get close to 10-12 hours.

When I pulled the old subs, the driver's side sub had corrosion on it. Maybe the previous owner spilled liquid onto the sub and caused it to get stuck or fail early.

kschwiggy · 02-23-2023, 08:14 AM

Out of curiosity, I swapped the Bavsound Revenant Pro back to the HK amp last weekend. What a difference. There was almost zero output from the subs with the Revenant Pro amp, and the mid range speakers were working very hard. After swapping back to the HK amp, the Bavsound Ghost subwoofers really came alive. I returned the Bavsound amp, but am keeping the subs.

jaxbmr · 02-25-2023, 08:41 PM

Quote:

Originally Posted by kschwiggy

Out of curiosity, I swapped the Bavsound Revenant Pro back to the HK amp last weekend. What a difference. There was almost zero output from the subs with the Revenant Pro amp, and the mid range speakers were working very hard. After swapping back to the HK amp, the Bavsound Ghost subwoofers really came alive. I returned the Bavsound amp, but am keeping the subs.

The subwoofers worked with the revenant pro amp though? Did they go the full 12 hours and did they still work?

kschwiggy · 02-26-2023, 06:21 AM

They worked with the Revenant pro, but output was very low. I only put about 6 hours on the subs before swapping the amp back to HK. The subs play just fine with the HK amp, so I don't think another 6 hours of break in would have made much difference with the Rev pro amp.

02-03-2023, 08:26 PM	#1
jaxbmr New Member 0 Rep 10 Posts Drives: 2015 BMW M235i Join Date: Jul 2022 Location: United States iTrader: (0)	HK Underseat Subwoofers still not working.. Please help! 2015 BMW M235i.. It’s been over 6 months since my HK subwoofers last worked. Both subwoofers died at the exact same time, they didn’t make any noise but they just shut off. I had people telling me it was my amp.. so I just recently sent it for a brand new bavsound revenant pro amplifier and full stage 1 speakers. Was disappointed to test it out and see my subwoofers were still not working.. I checked my error codes and all I have is a “Central Fault Memory Full”. What’s going on??
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02-06-2023, 10:27 PM	#2
kschwiggy Private 41 Rep 52 Posts Drives: 2016 M235i Conv. Join Date: Jul 2019 Location: DC Metro Area iTrader: (0)	I'm having the same problem... 2016 M235 and my subs have no output. I recently installed the Revenant Pro and no luck. I have the Ghost subs on order and will swap them in to see if the HK subs just died.
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02-07-2023, 02:21 PM	#4
mecodoug2 New Member 2 Rep 14 Posts Drives: 2017 M240i MT Join Date: Jul 2022 Location: MA iTrader: (0)	Suggest taking a resistance measurement from the amp end (with speaker wires unplugged) to see if the voice coils are shot. If you get a number near infinity, they are shot. If you get an ohm or a few ohms they are good.
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02-09-2023, 08:57 AM	#6
kschwiggy Private 41 Rep 52 Posts Drives: 2016 M235i Conv. Join Date: Jul 2019 Location: DC Metro Area iTrader: (0)	Sorry to hear that. My Ghost subs arrive today, but I may not be able to install until tomorrow. I'll follow up after I do.
	Appreciate 0 Quote

02-10-2023, 09:16 AM	#8
kschwiggy Private 41 Rep 52 Posts Drives: 2016 M235i Conv. Join Date: Jul 2019 Location: DC Metro Area iTrader: (0)	I swapped in the Bavsound Ghosts. There seems to be more bass now, but not a dramatic difference. Sound in the car still seems very treble-heavy, even if I set treble to -3 and bass to +3 (the max settings that Bavsound recommends. I also felt the subwoofer grilles for vibration while playing, and there is some, but not as much as I expected. That said, the subs are brand new, so I will need to break them in over the next few days.
	Appreciate 0 Quote

02-11-2023, 01:58 PM	#10
kschwiggy Private 41 Rep 52 Posts Drives: 2016 M235i Conv. Join Date: Jul 2019 Location: DC Metro Area iTrader: (0)	Yeah they seem to be working fine. I about 3 hours on them this morning, and will update after I get close to 10-12 hours. When I pulled the old subs, the driver's side sub had corrosion on it. Maybe the previous owner spilled liquid onto the sub and caused it to get stuck or fail early.
	Appreciate 0 Quote

02-23-2023, 08:14 AM	#11
kschwiggy Private 41 Rep 52 Posts Drives: 2016 M235i Conv. Join Date: Jul 2019 Location: DC Metro Area iTrader: (0)	Out of curiosity, I swapped the Bavsound Revenant Pro back to the HK amp last weekend. What a difference. There was almost zero output from the subs with the Revenant Pro amp, and the mid range speakers were working very hard. After swapping back to the HK amp, the Bavsound Ghost subwoofers really came alive. I returned the Bavsound amp, but am keeping the subs.
	Appreciate 0 Quote

02-26-2023, 06:21 AM	#13
kschwiggy Private 41 Rep 52 Posts Drives: 2016 M235i Conv. Join Date: Jul 2019 Location: DC Metro Area iTrader: (0)	They worked with the Revenant pro, but output was very low. I only put about 6 hours on the subs before swapping the amp back to HK. The subs play just fine with the HK amp, so I don't think another 6 hours of break in would have made much difference with the Rev pro amp.
	Appreciate 0 Quote