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Disco 3 Logic 7 weedy subwoofer
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mark c0
 


Member Since: 22 May 2015
Location: Essex
Posts: 60

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

I'm gutted about it. Looked on eBay and an amp is £250 if it is that.

Today my air suspension compressor destroyed itself so there went £350.

It's not my lucky month but the stereo actually bothers me more!

Mark.
  
Post #168422224th Jul 2016 10:18 pm
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JMack
 


Member Since: 02 Aug 2014
Location: Edinburgh
Posts: 1517

Scotland 2006 Discovery 3 TDV6 Commercial Manual Java BlackDiscovery 3

My Sub-woofer has been having issues as well recently.

At first I wasn't sure what the noise coming from the back was. It sounded like a walkie-talkie when it is on the edge of getting a signal and makes the whooshy/crackling noise. I had walkie-talkies in the back, so checked they were off. They were.

Then I noticed the same noise from outside the rear after locking and walking away from the car. It just lasted a couple of seconds, I thought it was the tailgate actuator or something frying itself! Shocked

I then noticed that the noise, which had at first been very intermittent became more regular, and turning the sub volume down cut the noise.

I've since disconnected the speaker and the noise has stopped.

The sub looks okay, isn't damaged, but I'm not sure how to test it further or how to diagnose if it's an amp fault.

Would connecting a 'normal' (car) woofer speaker to one of the sub connectors be a way to check the amp, or would I need a proper sub-woofer?

Confused
  
Post #168578729th Jul 2016 8:34 am
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JMack
 


Member Since: 02 Aug 2014
Location: Edinburgh
Posts: 1517

Scotland 2006 Discovery 3 TDV6 Commercial Manual Java BlackDiscovery 3

Okay, it looks like one of the coils is blown on my sub. I'm not getting a resistance (ohms) (infinity, not a short) across the terminals, the other one is just under 4 (3.7).

Is it possible to use the multimeter to check the voltage coming from the amp to the sub?
What should it be with the sub disconnected?
  
Post #168596929th Jul 2016 4:58 pm
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Sidestick
 


Member Since: 22 Apr 2012
Location: Rome
Posts: 2286

Italy 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

A burned coil is due the amplifier sending continuous current to it.
You need an oscilloscope to check if your amplifier has a burned final stage or it deliver continuous current to the sub
 - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT 
 
Post #168599729th Jul 2016 6:51 pm
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JMack
 


Member Since: 02 Aug 2014
Location: Edinburgh
Posts: 1517

Scotland 2006 Discovery 3 TDV6 Commercial Manual Java BlackDiscovery 3

Decided to strip the sub-woofer to investigate.

Found one blown coil, and the other is damaged.


Click image to enlarge




Click image to enlarge



Looks like I need to get a new speaker.
  
Post #168633730th Jul 2016 5:47 pm
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mark c0
 


Member Since: 22 May 2015
Location: Essex
Posts: 60

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

I looked into the wiring diagram to see why mines quiet and it l looks like it's fibre connection to the amp from head unit and 2 pairs to the sub.

Don't really help as I don't know if the head unit is not outputting or the amp. Both are bloody expensive

If it's the amp maybe I can get it repaired easier (hopefully) but no way to find out easily

Mark
  
Post #168655631st Jul 2016 10:23 am
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ds23man
 


Member Since: 19 Jan 2013
Location: Ainum
Posts: 227

Netherlands 2007 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Disvoverd yesterday the subwoofer signal is taken from the rear speaker audio path. If you set the fader only to the front, no signal to the sub! Shocked
  
Post #183883820th Jul 2017 9:39 am
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