What do I do with this faulty mtx 500d?

odinsragess · 9th September 2009, 10:37 PM

I searched on google and saw lots of posts here relating to FIRST GEN mtx 500d troubles. I really like this amp because of its size and power output.

I just bought one off ebay, but it has an issue. The sub will play fine for a minute, and then all of a sudden, the cone will just stick out all the way and be held at full excursion, as if you put a 9v battery to the terminals. Then it will go back to playing, etc.

And the coil starts to smell.. needless to say its not hooked up anymore. Almost as if its giving the sub straight DC.

Anyone know if this is easily fixable or who might fix it? MTX used to completely re-board these for 55 dollars, but they dont have parts anymore. I dont have the best electronic repair skills....

It looks fine inside. Nothing looks burned. Should I perhaps start a dispute with paypal? Since this guy never said it was blown? Anyone wanna buy this one and fix it if you can do it easy and cheap?

sdoom · 9th October 2009, 10:09 PM

1st: paypal gives a sh.. about what you bought ! They didn´t return any money to me although police started investigation on the seller. He did it on purpose causing aprox. 20000 Dollars in one week. All I can say : "thanks for the protection" guys. Paypal one and only response was " if we cannot get the money , you wont see any!".

About your amp problem. It´s not always the amp causing trouble. Do you have an aftermarket head unit ore a stock head unit using an adapter to connect the amp to the head unit ? My cousin has a Peugeot with a stock radio , uses a big digital amp. sometimes the amp makes real ugly noise and when I first heard that sound I thought the woofer will be a pyle of ashes in a few seconds. he then told me that sometimes happens when he plays the msuic louder and turns the msuic down. With his old alpine head unit he never had those problems.

brandes.cm · 9th October 2009, 11:09 PM

What happens if you turn down the gain when it sticks? If you are going to sell it how much, I don't need another sub amp really. I just like to work on them. I already have a 421D and 251D, might be nice to add to the collection.

Cory

I Am An Idiot · 10th October 2009, 11:49 AM

Unless you just could care less about your speakers, do not connect them and try adjusting the gain control when it fails.

9th September 2009, 10:37 PM	#1
odinsragess diyAudio Member Join Date: Sep 2009	What do I do with this faulty mtx 500d? I searched on google and saw lots of posts here relating to FIRST GEN mtx 500d troubles. I really like this amp because of its size and power output. I just bought one off ebay, but it has an issue. The sub will play fine for a minute, and then all of a sudden, the cone will just stick out all the way and be held at full excursion, as if you put a 9v battery to the terminals. Then it will go back to playing, etc. And the coil starts to smell.. needless to say its not hooked up anymore. Almost as if its giving the sub straight DC. Anyone know if this is easily fixable or who might fix it? MTX used to completely re-board these for 55 dollars, but they dont have parts anymore. I dont have the best electronic repair skills.... It looks fine inside. Nothing looks burned. Should I perhaps start a dispute with paypal? Since this guy never said it was blown? Anyone wanna buy this one and fix it if you can do it easy and cheap?

10th October 2009, 11:49 AM	#4
I Am An Idiot diyAudio Member Join Date: Mar 2007	Unless you just could care less about your speakers, do not connect them and try adjusting the gain control when it fails. __________________ If it ain't broke Don't fix it

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9th October 2009, 10:09 PM	#2
sdoom diyAudio Member Join Date: Mar 2004 Location: Heidelberg	1st: paypal gives a sh.. about what you bought ! They didn´t return any money to me although police started investigation on the seller. He did it on purpose causing aprox. 20000 Dollars in one week. All I can say : "thanks for the protection" guys. Paypal one and only response was " if we cannot get the money , you wont see any!". About your amp problem. It´s not always the amp causing trouble. Do you have an aftermarket head unit ore a stock head unit using an adapter to connect the amp to the head unit ? My cousin has a Peugeot with a stock radio , uses a big digital amp. sometimes the amp makes real ugly noise and when I first heard that sound I thought the woofer will be a pyle of ashes in a few seconds. he then told me that sometimes happens when he plays the msuic louder and turns the msuic down. With his old alpine head unit he never had those problems.

9th October 2009, 11:09 PM	#3
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	What happens if you turn down the gain when it sticks? If you are going to sell it how much, I don't need another sub amp really. I just like to work on them. I already have a 421D and 251D, might be nice to add to the collection. Cory