Car Audio Help!

[PCTweaker5]

Im very new to the car audio world and have a question that I would appreciate an answer to. If my MRP-M350 mono amp is rated at 350w x 1 RMS into 2 ohms and I connect two 2 ohm subs, will both subs be getting 350 RMS since it is a 700 watt amp or does it not work that way? Thanks in advance!

 

[daveybrat]

Most likely not.
Most amps are rated or sold at their "max" wattage.
So yours if probably 700watt "max" with 350watt "rms"
then if you want 2 channel you'd be down to 175watts rms to each channel.
which 175watt RMS isn't too bad unless you've got some killer subs.

 

[PCTweaker5]

Somebody told me this at another forum:
"If you hook up two 2ohm subwoofers you will either have them wired to one ohm in parallel or four ohms in a series.

And no, it doesn?t work that way with amps. It's kind of like this: Say you have a 1000 watt amp (1000x1) or something like that... If you have two 2ohm subwoofers and wire them up in parallel then they will be down to one own total, right? Well you simply divide the 1000 by two. SO they each get 500 watts rms."

 

[daveybrat]

i'm not sure where that's going, but i'm telling you that each sub will still need it's own amount of power to push those magnets, so no matter how you wire them, they are still going to pull their own wattage.
And a 1000watt amp like you said with each getting 500watts? I haven't seen a 1000watt "RMS" amp in a while that's affordable.
Maybe a 1000watt peak, and 500watt RMS.
I'm rusty on the 2 and 4 ohm deal, but either way, each sub needs power, and RMS is the only true rating, not the peak.

 

[Doodoo]

I would not connect two 2 ohm subs to that amp. You could wire them in parrallel and get a total of 1 ohm...you would blow your amp out unless its rated for 1 ohm. I'm pretty sure it isn't though. You could also wire them in seris which would give you a four ohm load. That amp only gives out 175 watts at 4 ohms...so each speaker would only see about 90 watts.

If you want two subs, what you want is two 1 ohm subs or two 4 ohm subs. Wire the two 1 ohm subs in series to get your two ohm load or wire the two 4 ohm subs in parrallell to get two ohms. Hope that clears a few things up for ya.

 

[PCTweaker5]

Ya sort of, I need this info for Zonto here because he's thinking of buying my 700w Alpine amp and wants to know how much wattage RMS 2 subs would get.

 

[Doodoo]

Are you sure that its a 700 watt amp? Everywhere i look says its a 350 watt amp.

 

[PCTweaker5]

350wRMS 700w max.

 

[Doodoo]

So the most rms he will get out of it will be 175 per sub. He'll need 2 four ohm subs or 2 two ohm subs for that.

 

[ZoNtO]

Dang that sucks, I was planning on getting 2 Infinity Perfect 10.1D's to use at 350 each.... Hmmm decisions decisions.....

 

[Doodoo]

I hear the Perfects are good subs...though i've never heard them. You would always get some JL W3's or IDQ's and use the amp. I have two 12 IDQ's and i have 300 going to each sub and it sounds loud and tight.

 

[ZoNtO]

Well, if you have 300W going to each sub this amp wouldn't be the best choice! That's the whole dilemma...