Just a reply to 'A question for MM104 and MM124 owners... Someone help me out...
C-Man
Posts: 307
Nope, you're wrong, I can almost guarantee it. A monoblock amp is one channel, therefore already "bridged." It will do you no good to parallel your subs... The amp is already wired parallel inside the amp, so if your mono amp has two outputs on it, it's just to make the install more clean. And I'll say it again, if you have one 4 ohm sub... and you bridge an AB amp, you will get a 4 ohm mono load. You will not get a two ohm load unless you add another subwoofer. Think about it, if you have an amp that's not 2 ohm stable, and you bridge it and run it to one sub, it won't overheat right? But if you add another sub, you have an amp that will go in to protection over and over again. You're right, if you have only one sub on a mono amp, you will only get half the output power of the amp. But if you bridge a 2 ohm stable AB amp to one sub, you'll only get half the output power of that amp too because it will only be a 4 ohm load. I am positive about that.
"The Big C"
Post edited by C-Man on
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heya... you're half right.
a d block is already "bridged" --- theres more to it than that, but for sake of grammer, thats good enough of a term.
if you put a 4 ohm load on a D block amp that will do 1000 watts at 2 ohms... then you will not get "half" since amps dont actually double that way, but you will get something like 650 at 4 ohms / 1000 at 2 ohms. its about a 40% drop when you "double" the ohm-load.
as far as ab's... well... ok... we take a 2 channel ab amp. that is lets say 100 x 2 at 4 ohms... now at 2 ohms, this amp is stable in stereo and does 150 x 2 or 160 x 2 STEREO.
so now we bridge the thing... we get 300 - 320 watts into 4 ohms -- not 2... but 4 (monty python voice). You are getting the FULL Power of the amp.
WHy is this?
this is not the "actual" reason, but lacking the desire to type out 2 pages of electrical theory.. here we go. .......
If you have TWO channels, that are each 2 ohm stable. you bridge them and you will get the SUM power of those two channels at 2 ohms thrown into one channel at 4 ohms.
If you have two channels that are 4 ohm stable, you bridge them and you will get the sum power of those two channels at 2 ohms thrown into one channel at 8 ohms -- put a 4 ohm load on that bridge and the amp will probably go into protect.
IE specs of a case amp... mtx 8302
12 volt...
75 x 2 @ 4 ohms
150 x 2 @ 2 ohms
300 x 1 @ 4 ohms.The Artist formerly known as PoweredByDodge -
My point was just that if you have a 4 ohm sub, and you bridge the amp, you're still gonna have a 4 ohm load. You won't get a two ohm load till you add another sub. That was my point."The Big C"
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an ab amp that is 2 ohm stable is running at full rated power with a bridged 4 ohm load. Bridging a second 4 ohm driver will most likely send the amp into protection.
bridging an amp doubles the voltage going to the speakers - which has the same effect as cutting the resistance in half (Ohms law) This is why most people try to say that an amp will see a 2 ohm load with a single 4 ohm driver bridged - technically not true but it works for most intents and purposes -
Automaticman, I just wanna say thank you for actually taking the time to answer the question... or respond to the statement I was actually asking/making."The Big C"
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no problem,
glad to help!
