54 replies to this topic

[mymini007]

It sounds like its just the amps thermal protection kicking in, if you want it louder you need to buy a standalone amplifier.

Rich

I unplugged the amp and its still doing it. Or do you mean the amp in the HU?

[Rich.]

Yep, the amp in the HU, providing you are using it?

Rich

[mymini007]

Yep, the amp in the HU, providing you are using it?

Rich

How do I know if I am using it, I have 4 speakers coming directly from the HU and thats the ones that are making it cut out, If I put 2 of these through a small amp will this stop it?

[Rich.]

Even better would be all 4 of them through an amp, and use the line out of the stereo to provide the input to the amplifier. But yes, the less load you can get off the head units amp the better it will be.

Rich

[mymini007]

Even better would be all 4 of them through an amp, and use the line out of the stereo to provide the input to the amplifier. But yes, the less load you can get off the head units amp the better it will be.

Rich

Can I run the 4 off 1 amp as I only have 2 amp ports in the back of the HU and one is being sued for the 6x9s in the back?

[mini_mad69]

Even better would be all 4 of them through an amp, and use the line out of the stereo to provide the input to the amplifier. But yes, the less load you can get off the head units amp the better it will be.

Rich

Can I run the 4 off 1 amp as I only have 2 amp ports in the back of the HU and one is being sued for the 6x9s in the back?

The head unit should be able to power all four speakers from it's internal amplifier. Running them from an external amplifier is just masking the problem here.


Check all connections, clean if nessacery. Ensure a good earth connection, and check the voltage of the car when running, both at the battery terminals and at the headunit.


Mine used to do it with the voltage drops from the subs, would cause a low voltage throughout the car and the headunit would turn off, and then turn right back on.

[Rich.]

No its not, maybe you dont understand what im saying?

The reason the HU is cutting out is because as the volume is increased, the amplifier is being overloaded, trying to provide a high output to all four channels, so to prevent damage to the amplfier most companies, be it in a head unit or a large amp rack used for a gig or show, include whats called a thermal overload protection, bassically the amps been worked so hard it has either overheated, or it starting to damage itself, at this point the protection kicks in a shuts the head unit down.

By taking the load off the HU and using a larger amplifier, you are able to get more volume from your speakers, without trippingthe overload on an amplifier thats too small to provide the SPL output required.

Rich

[mymini007]

Even better would be all 4 of them through an amp, and use the line out of the stereo to provide the input to the amplifier. But yes, the less load you can get off the head units amp the better it will be.

Rich

Can I run the 4 off 1 amp as I only have 2 amp ports in the back of the HU and one is being sued for the 6x9s in the back?

Mine used to do it with the voltage drops from the subs, would cause a low voltage throughout the car and the headunit would turn off, and then turn right back on.

Thats exactly what mine is doing.

[mymini007]

Can you put up some kind of wiring diagram that an idiot can follow (me) I have no idea about this stuff. I just followed the wiring diagram on the amp kit.

[Rich.]

If its turning off with the kick of the bass sand your already runing an external amplifier, then you might want to add a power cap onto your amplifier. This builds up a charge so when the amplifier requires a large amount of current (i.e for a base hit) then it sucks it from the cap rather than drawing a large current from the electrical system.

Rich

EDIT; The best way to test if its the overload protection or the amp would be to disconnect the amplifier and turn it up and see if it cuts out or not, this will identify the problem.

Edited by Rich., 07 June 2010 - 06:53 PM.

[Brams96]

It might be easier if you post a list of all the type/models of speakers and head unit and any power information they have on them (ie wattage)

Can I run the 4 off 1 amp as I only have 2 amp ports in the back of the HU and one is being used for the 6x9s in the back

Just reading through all your posts it sounds like you have 4 speakers running off the head unit, I'm assuming 2 front & 2 parcel shelf, and your also running 2 6x9's (under the seat?) from one of the pre-outs (RCA) connections. Is this right ? (or have I misread it?) If this is the case then the channel powering the 6x9's and other speakers is running at 2ohms which is very bad! and that's why it will be cutting out.

Can you explain or post a wiring diagram of what speakers your running from where so we can all get a better picture of how it is wired.

[Rich.]

I got the impression a sub was being used aswell?

[Brams96]

I got the impression a sub was being used aswell?

That would make it even worse! LOL

[mymini007]

HU Sony 4x45 USB Mp3 Cd jobbie

This amp the one on the left!



Powering these 6x9s



These are under the rear seat

And the Hu is powering (directly off the speaker ports in the HU) The fusion ones on the right x2


These are in pods on the flitch panel

And a set of dual cone alpine, 4" component speakers with tweeters built in. In the dash where the vents used to be.

Edited by mymini007, 07 June 2010 - 10:00 PM.

[mini_mad69]

No its not, maybe you dont understand what im saying?

The reason the HU is cutting out is because as the volume is increased, the amplifier is being overloaded, trying to provide a high output to all four channels, so to prevent damage to the amplfier most companies, be it in a head unit or a large amp rack used for a gig or show, include whats called a thermal overload protection, bassically the amps been worked so hard it has either overheated, or it starting to damage itself, at this point the protection kicks in a shuts the head unit down.

By taking the load off the HU and using a larger amplifier, you are able to get more volume from your speakers, without trippingthe overload on an amplifier thats too small to provide the SPL output required.

Rich

I know excactly what your saying, but! A modern head unit can easily power 4 speakers, afterall they do in pretty much every hatchback.

The overload proetection will come in when there is a fault usualy.

I believe running the 4 speakers from an auxilary amplifer will just cause the voltage drops to get worse as the aux amp will take even more power, just meaning the HU will shut off earlier.


Mymini007 is not running a cheap headunit, it can easily power 4 speakers. There is an underlying fault here causing problems.