Is old school mtx 81000d 1 ohm stable?

[snyderd758 10+ year member]

As the title states I picked one of these up relatively cheap and wanted to try it out. How do you guys think it would compare to my jl audio 1200/1v3. I'm running 4 sa8v2 d2 so my final ohm load is 1 ohm. Thank you for participating!

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[BoomTaco64]

the mtx thunder 81000d is a 2ohm stable amplifier with huge power. more power than the jl but the jl will be 1.5ohm stable.

 

[tprj82 10+ year member]

it can be easily modded to run 1 ohm, but like he said great power, great amp

 

[BoomTaco64]

yes easily modded but not so easy to repair when modded. parts are very scarce for them. unregulated power supplies so they can be run at high voltage and will get better power.

 

[snyderd758 10+ year member]

Yeah I saw on you tube how to modify it to one ohm. My jl does 1 ohm all day and stays cool too. I just opened the mtx up man is it beefy. What will these do at 1 ohm?

 

[snyderd758 10+ year member]

Guts

 

[snyderd758 10+ year member]

as far as I understand the video you cut out q239 and this makes it 1 ohm stable if I were to do this does it screw it up in any other way? im not sure I am going to keep it my jl is brand new and this is 13 years old the curiosity may get the better of me though.

 

[Spooney 10+ year member]

The mod doesn't make the amp one ohm stable. It only removes the short circuit protection circuit from the amp so the amp won't go into protection when it sees loads lower than 2 ohm nominal. Just pray you never short the output terminals,blow a sub,or run too low of a load on this amp. Yes many people have ran these at one ohm but I am willing to bet they had some hefty impedance rise as well. Its not worth the risk on these amps IMO. Like was said before parts are very scarce and if you manage to blow the amp there is a good shot it is not repairable. Some of the parts used in these amps were already obsolete when MTX started producing them. Last I knew there was no known good substitute parts. Class D amps can be very finicky with what parts will work as outputs and these amps are no exception. If you need a one ohm stable amp or more power than get another amp. Don't try to make an amp do something it wasn't designed to do.

 

[snyderd758 10+ year member]

The mod doesn't make the amp one ohm stable. It only removes the short circuit protection circuit from the amp so the amp won't go into protection when it sees loads lower than 2 ohm nominal. Just pray you never short the output terminals,blow a sub,or run too low of a load on this amp. Yes many people have ran these at one ohm but I am willing to bet they had some hefty impedance rise as well. Its not worth the risk on these amps IMO. Like was said before parts are very scarce and if you manage to blow the amp there is a good shot it is not repairable. Some of the parts used in these amps were already obsolete when MTX started producing them. Last I knew there was no known good substitute parts. Class D amps can be very finicky with what parts will work as outputs and these amps are no exception. If you need a one ohm stable amp or more power than get another amp. Don't try to make an amp do something it wasn't designed to do.

as stated my sundowns are running fine off the jl I guess I just got all googly eyed when I saw this amp. im a amp hoarder I don't even know how many I have down stairs Im not gonna mess with this will probably just pass it on to another member for a great price. thank you very much for the info spooney.

 

[tprj82 10+ year member]

Well I have an ugly one laying about ten feet from me, works great so if you ever wanted to strap yours I'll let it go cheap

 

[snyderd758 10+ year member]

Well I have an ugly one laying about ten feet from me, works great so if you ever wanted to strap yours I'll let it go cheap

Pm me Price I'm considering it.