hi, i have a amp that will produce 240w rms at 2ohm bridged, and have a sub that is 4 ohm, will this work? or will i have to use the 120w none bridged 4ohm.

or in short get another amp.

You can use the amp, however it will only give you around 120watts rms at 4ohm bridged

just due to the risistance causing a lower wattage?? so bridging it at supposed 240watt 2ohm, will not break the sub, will just work at a lowwer watt and at 4ohm.

Thats correct As with all amps though, you need to set the gain correctly to avoid sending a clipped signal to the sub

clock34 said:

just due to the risistance causing a lower wattage?? so bridging it at supposed 240watt 2ohm, will not break the sub, will just work at a lowwer watt and at 4ohm.

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Yes if you a running a 4ohm's then the resistance is higher than at 2ohm's. The lower the resistance the less hard the amp has to work so therefor can produce more power.
What amp is it you have.
Bridging the channels of an amp doesnt effect the resistance, resistance comes from the speaker usually halving the resistance for every coil that you add.
So if you have a speaker with a dual voice coil each showing 4ohm's connecting them together in series will result in the speaker as a whole showing 2ohm's.

Also i think that you may be getting a little bit confused with the power ratings and what does what. If you bridge an amp then you are using 2 channels for one speaker rather then just one so if you are using two channels then you will always get more power (often more than double) than just using one.

ive got a alpine mrp-t220, 70w rms x 2 4ohm, 140wrms x 1 bridged 2ohm. (i was reading peak earlier not rms,

and i have a mutant x nw1040x sub.

just a quick set up will upgrade once its running.

In that case you'll only be getting about 70 watts RMS which isn;t really enough to properly power a sub

ok, so i should look at a monoblock, for min 3-- rms?

You should look to give your sub around its rated RMS power, you do not necessarily need a monoblock, a bridged 2 channel amp does just the same job

volxstu said:

Yes if you a running a 4ohm's then the resistance is higher than at 2ohm's. The lower the resistance the less hard the amp has to work so therefor can produce more power.

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That is wrong AGAIN, the lower the impendance the harder the amp has to work, it must be obvious that if somethig has to produce more output it is working harder.

Your not burning more calories when your are walking than to when you are running.

East Upper Gooner said:

That is wrong AGAIN, the lower the impendance the harder the sub has to work, it must be obvious that if somethig has to produce more output it is working harder.

Your not burning more calories when your are walking than to when you are running.

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I'm guessing you meant the harder the amp has to work :yum:

yes lol

Sorry this is my Dyslexia showing, I look at it differently obviously the amp doesnt have to work as hard to produce the same wattage with less resistance so the lower the resistance the harder the amp can work.
The way that i said it is just easier to understand for somebody who doesnt know anything about it.