Question abt multiple amps...

[bigtrav101 10+ year member]

Ok, so I have 3 MTX TS8512-44 which are 4 ohm 12s. I have a t15001 bd to run on 2 of the subs which will put that amp at 2 ohms. On the third sub I want to run my t5001 bd which will also put that amp at 2 ohms. Someone mentioned to me that I should just sell my 2 amps and get 1 big amp to run all the subs. I don't want to go through the headache of trying to sell my stuff...so my question is, will it be fine to run those 2 amps on the 3 subs the way I want to do it or is it best to sell them and get 1 big amp?

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[Chriszle 10+ year member]

You can do it that way, but I would highly recommend not doing it. The subs will be hitting out of phase and cause cancellation and overall poor sound quality. Better to just run them on 1 amp. If you t15001 is 1 ohm stable, not sure if it is, why not just run all the subs on that?

 

[bigtrav101 10+ year member]

Since the subs are dual 4 ohm I'd only be able to go .67 ohm or 2.67 ohm right? and I didn't want to chance the amp...

 

[Chriszle 10+ year member]

I was confused as your first post. I thought they were Single 4 ohm. You can run them at 2.67 for now. Then you can sell your other amp.

 

[bigtrav101 10+ year member]

O ok...I guess I may have to upgrade to the t2500...

 

[Chriszle 10+ year member]

Or you can find an amp that does its power at 2ohms rather than 1, or pick up a matching 1500 and strap them.

 

[n2audio 5,000+ posts]

there's really not a problem other than using 2 amps to do what one can do. If it's already there I agree that there's no point in making a change.

Cancellation? Uh, no.

 

[bigtrav101 10+ year member]

Ok...and it will be ok that the t1500 is ran at 1ohm on 2 subs while the t500 is ran at 2ohm on the 3rd?

 

[n2audio 5,000+ posts]

Nope. No problem.

As long as both amps are getting the same signal and you get the levels and x/o settings the same you should be good to go.

 

[cdc351jeferson 10+ year member]

Until one clips and other doesn't then you Smell coils //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Chriszle 10+ year member]

there's really not a problem other than using 2 amps to do what one can do. If it's already there I agree that there's no point in making a change.
Cancellation? Uh, no.

Uh, yes. I would like to know how to set the levels of two completely different amps so that they put out equal power from say 20-80 hz. You may be able to match output at one frequency, but as soon as the frequency changes so will the power.

 

[quackhead 10+ year member]

Since the subs you are using are virtually impossible to find new (and not EVEN trying to find re-cones), maybe the smartest thing would be to run 2 of them on the T1500 at 1 ohm and save the other as a replacement sub for one of the two you have. The Bd amps are good amps, and I would not sell them, if not needed. I am assuming all 3 subs are in separate chambers. You could run one sub on the T500.1 at 2 ohms for 400 watts rms and the other two on the T1500.1 at 1ohm and lower the gain to produce 800 watts at 1 ohm with a DMM, but if you understand how Class D operates, you would not do this.(And it would be the same result as running all 3 subs at 2.5 ohms on the T1500.1) The gain is not a volume control and the amp will operate a lot less efficiently at less than rated output. If these were class A/B Amps, then this option might be viable...but the issues of ohm rise and phase still comes into play when using 2 different amps at 2 different nominal impedance loads in the same system trying to reproduce the same frequencies.

 

[quackhead 10+ year member]

if anything, get some bigger subs that will work with the t1500.1, or re-design a box for 2 of the subs you have, if you want more output.

 

[pickup1 5,000+ posts]

try to find 1 big amp...

 

[quackhead 10+ year member]

the AQ 2200D at .75 nom. would work...maybe too good for those subs.