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Good Amp?


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donkason 
Copper - Posts: 189
Copper spacespace
Joined: December 27, 2002
Location: United States
Posted: April 25, 2003 at 9:23 PM / IP Logged  
Anybody know of a good high performance amp that is 1/2 ohm stable. I can't seem to find any. I need it to drive 3 high powered subs. The amp I have now is only stable to 1 ohm and I am running it at 2.66 ohms. It really isn't being used to its full potential. My speaker setup is 3 JL audio w3's with dual 4 ohm voice coils. My other wiring option is .66 ohms and that would fry my amp.
Big Purds 
Silver - Posts: 574
Silver spacespace
Joined: November 25, 2002
Location: Canada
Posted: April 25, 2003 at 9:40 PM / IP Logged  
MMATS d100hc is stable down to 1/2 ohm and produces roughly 1400-1500W...I have seen them put out as much as 1700W without modding them...
that may be a bit much for your w3s though...
JellyNutz 
Copper - Posts: 85
Copper spacespace
Joined: August 18, 2002
Location: United States
Posted: April 25, 2003 at 10:30 PM / IP Logged  
If it were me and i were on a budget, I'd get an amp that is stable at 4 ohms mono (Which is what is most commonly out there). If you have them wired like I think you do (Each coil in series, and each sub in parallel) then you will not have a problem. Bear in mind that a speaker is an inductor, and impedence changes with frequency. It is pretty much common knowledge that a theoretical 2.66 ohm load presented to a 4 ohm mono (bridged or monoblock) amplifier will work with little or no problems (unless the amplifier is an absolute piece of sh*t). If you are leary of the idea (Trust me you don't have a reason to be)and have some cash, I'd suggest a JL Audio 500/1 or a 1000/1 which are both stable from 1.5-4 ohms, and also put the same amount of power out at any of these impedances. They are definately worth the money...
Jesse
Joseph's Car Everything
Big Purds 
Silver - Posts: 574
Silver spacespace
Joined: November 25, 2002
Location: Canada
Posted: April 26, 2003 at 1:32 PM / IP Logged  
JellyNutz wrote:
It is pretty much common knowledge that a theoretical 2.66 ohm load presented to a 4 ohm mono (bridged or monoblock) amplifier will work with little or no problems (unless the amplifier is an absolute piece of sh*t).
I beg to differ...my MTX 2300s, which are far from sh*t, will not handle a 2.66 ohm load in mono...the threshold is right around 3 ohms...
JellyNutz 
Copper - Posts: 85
Copper spacespace
Joined: August 18, 2002
Location: United States
Posted: April 29, 2003 at 7:34 PM / IP Logged  
I don't think MTX is crap (In fact i love MTX), but have you even tried wiring it like this? I've wired several amps like this with no problems, including MTX. 3 ohms may be the threshold, but like i said, bear in mind that speakers are inductors, that is, impedence changes with frequency... your amp is only going to see a 2.66 ohm load at exremely low frequencies (The lowest frequencies you hear in most common music are 40Hz and above). The higher the frequency played to your subs, the more resistance you speakers (inductors) will place on the amplifier. It is possible, I'm not the only installer that has done it, and if you take theory into account, you could understand what I'm trying to say to you. Please do not take offense, it is only advice. If you don't like my idea, then do something else. Like I said, you should go with a JL amp if you have the money. These amps are stable between 1.5-4 ohms and put the same amount of power out at these impedences...
Best of Luck,
Jesse
Jesse
Joseph's Car Everything
Big Purds 
Silver - Posts: 574
Silver spacespace
Joined: November 25, 2002
Location: Canada
Posted: April 30, 2003 at 7:13 AM / IP Logged  
lol, no offense taken...
I have put amps (not my MTX, but an Xtant 1001DX) into protection because of impedance changing while hammering out a really low note, and I do understand what you are saying...
I just know my amps very well and know what they can and cant do...

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