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Old 11-16-2009, 10:45 AM
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I have a mono amp that will give me 220w @4ohm or 400w @2ohm. Which way to wire and match up to the proper sub. I want to run one 10" sub, any suggestions on which sub would be the perfect fit?

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Old 11-16-2009, 05:00 PM   #2
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Maybe this page will help you understand what you want to do. Just put in the type of sub it is. Whether it is a single voice coil or dual, and the ohm of each.

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Old 11-16-2009, 05:44 PM   #3
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For this price point you can't go wrong in a wrangler.

Infinity 1052w Reference Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield.com

The 1052w has dual 4 ohm voice coils so you can wire that one sub in parallel so the amplifier will see a 2 ohm load.


Like this.
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Old 11-16-2009, 11:32 PM
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4 ohm dvc Infinity sub 125 rms x 2 to give me 250 watts wired to put out 2ohms. My amp will go 400 watts. Should I try to get closer to the 400 watt output of the amp or not?
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Old 11-17-2009, 12:10 AM   #5
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Originally Posted by glock22ed View Post
4 ohm dvc Infinity sub 125 rms x 2 to give me 250 watts wired to put out 2ohms. My amp will go 400 watts. Should I try to get closer to the 400 watt output of the amp or not?
I don't understands what you are asking. If your amp will output 400 watts @ 2ohms that is what you should do. What is the make and model of your amp?
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Old 11-17-2009, 12:44 AM
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alpine mrp-m450. I want to know what power range I should strive for in my sub to be the best match for my sub output of 400 watts.
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Old 11-17-2009, 08:08 AM   #7
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Look at this picture again. You are going to wire your amplifier and sub exactly like this.



That means the amplifier will see a 2 ohm load if you use the Infinity 1052w. The amplifier will output 400w if you tune it properly.
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Old 11-17-2009, 12:07 PM
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thanks I understand the wiring part. If my amp will put out 400 watts what sub wattage will sound the best with this wattage? Ex: will a 125 watt sub sound better pushed with 400 watts or should I look for a sub that is 225 watts, 300 watts or closer to 400 watts
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Old 11-17-2009, 01:43 PM   #9
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You start with RMS and go to Peak power. You can push up to 1000w to the Infinity sub I listed. The more power you push the harder it will hit. I'm running 500w to my set and they sound great!

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Old 11-17-2009, 03:09 PM
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looks good . But u didn't answer my question. What is the best sound match up . Ex: 400 watt amp. Is a sub at 125 rms better sounding than a sub at 250 rms, better sounding than a sub at 500rms. When hooked up to an amp at 400 watt? Where's the line between your sub getting to much power from an amp to a sub not getting enough power to the sub?
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Old 11-17-2009, 03:30 PM   #11
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I think I understand what your asking. Your wanting to know what wattage of speaker to match up to your 400 watt amp. I'll try and explain a few basics the best I can so that you'll understand better.

How you wire your amplifier will determine how much it will put out. The energy put out from your amplifier is forced out. So at the right note and volume at some point there will be 400 watts coming out of your amplifier at certain peaks. That is why it is called peak output. A subwoofer is rated at how much it is able to handle from an amplifier. That means if you wire your amp up to put out 400 watts and hook up a subwoofer that is rated at 200 watts peak, the amplifier is going to force 200 more watts into the subwoofer than it can handle and destroy it. You are always going to want your subwoofer to be rated equal to or higher than your amplifier.

Hope this helps.
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Old 11-17-2009, 03:52 PM
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Thank u .There for i need to look for a sub somewhere between 200rms - 400rms. What will a sub rated over my amps output sound like? Say 500rms sub?
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Old 11-17-2009, 04:35 PM   #13
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Thank u .There for i need to look for a sub somewhere between 200rms - 400rms. What will a sub rated over my amps output sound like? Say 500rms sub?
I think you are confused. You can look for any subwoofer as long as it is rated to take 400w. As long as the subwoofer can handle the load from your amp you won't notice a difference in sound unless you modify your enclosure. A sub is a sub is a sub. The difference comes from the amount of power you put to it and the enclosure you put it in. You can make a 2 dollar woofer in the proper enclosure sound better than a 1000 dollar woofer in the wrong enclosure.

The only other way to get a subwoofer to sound better is to move up in size.

So just to get this clear as mud... A 200w RMS subwoofer will sound almost identical as a 400w RMS subwoofer in the same enclosure providing you send the same amount of power to each.
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Old 11-17-2009, 07:38 PM   #14
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The higher your RMS, the louder and cleaner your sub will sound...BUT...that's the higher the RMS of your amp.

In other words...it doesn't matter what sub you use, as long as it's not undersized for that amp, it's going to sound about the same whether you go with a 150RMS (per voice coil) DVC 4ohm sub or a 250RMS sub at 2ohms, etc. Well...actually, it will matter in a way...if you hook up a sub designed to run at 800w RMS (just throwing out number here)...your amp won't be delivering anywhere close to that wattage to the sub, thus causing it to not run as efficiently as it was designed to. In other words...it wouldn't sound as good as it should.

The sub Mr. Clifford recommended is a great match for the amp you're running...
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Old 11-18-2009, 04:17 PM
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Thanks guys
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Old 12-12-2009, 12:10 AM   #16
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Wow lots of confusion here, to clear something up peak and RMS are two completely different rating scales. Peak can pretty much be whatever the manufacturer wants to say it is within reason, therefore it means NOTHING, normally the crap brands like sony, dual and bazooka use the peak(or max) rating to make them look better, but its total BS. RMS is what you want to look at. Since your amp can push 400w at 2 ohms you want to find a sub around 400w with either a single 2ohm voice coil "or" dual 4ohm voice coils which would be run in parallel to drop the ohms down to 2. You can power a sub slightly higher than 400w, but I wouldn't recommend over 500w since your amp will become extremely prone to clipping which is where the amp falters at the top and bottom of the sound wave when at high volume. You can also power a slightly lower powered sub and just tune the amp down a bit. This is a good thing to do because it will allow your amp to run cooler and more efficiently since it isn't having to stress at its maximum. Some good brands to look at are JL audio, MTX, infinity is good but they tend to be a bit on the quiet side for their power ratings. Alpine is ok but is way over rated and over priced for what you get, Memphis and boston acoustic are both excellent as well. If you want quality get the JL, if you want affordability with a good kick grab a MTX, kicker will give a nice sound as well but I find for the money MTX hits harder while producing the same quality. Just make sure you buy something at least middle of the line, the bottom end of most any company tends to be fail with few exceptions.
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Old 12-12-2009, 11:08 AM   #17
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Wow lots of confusion here,
And you aren't helping.
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Old 12-12-2009, 01:49 PM   #18
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well giving wrong information like saying a 200w sub and a 400w sub will sound the same in the same enclosure with the same power isn't helping either. If you give them both 400w the 200w sub will blow very quickly, if you give them both 200w the 200w sub will sound better because it is performing at its optimal parameters while the 400w sub will be starved for power, this will keep the 400w sub from reaching full x-max. Not to mention it is almost guaranteed the 200w sub and the 400w sub will require different VAS requirements(interior air space). Not to mention you pretty much have the concept of size and sound quality ass backwards. "Generally" smaller subs produce better quality because they are tighter hitting, the down fall to a small sub is they may not be as loud or deep, but this is besides the point since gLock wants a 10". I will agree with you though that one of the most important things is to make sure the sub is in the proper enclosure. One thing I have found that will help is once you have the right size box, you can have the outside coated in a spray on bed liner for both durability and to make it completely air tight.
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Old 12-12-2009, 01:57 PM   #19
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If you give them both 400w the 200w sub will blow very quickly,

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Old 12-12-2009, 03:22 PM   #20
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Quote:
Originally Posted by MR.CLIFFORD View Post
x2
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Old 12-14-2009, 09:48 AM
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got a sub but I have a problem

I purchased a 10" Alpine swr 1042d dual coil 500rms wired @2ohm. I hooked it up to my mono amp 400watt @2ohm. I got no sound. I hooked it up to my sons cheapo Lightning audio amp [email protected] he has a + + _ _ Outside pos and neg says bridged. I hooked it up in the bridged mode and it works. Any thoughts on why it wont work on my amp. Note his 2 12"s hooked up to my amp work.
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Old 12-14-2009, 09:51 AM   #22
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How did you wire the subwoofer? You have to wire both voice coils and for a 2 ohm load it should be wired like this.




How did you wire your subwoofer to your amplifier?
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Old 12-14-2009, 09:55 AM
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That's how I did it
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Old 12-14-2009, 09:59 AM   #24
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And you are positive you wired the subwoofer correctly to the amplifier? Some mono amps have 4 prongs to make it easier to wire 2 subs and it is easy to mistake which ones are the positive terminals and negative.

How did you send signal to your amplifier? Through RCA cables from your head unit? What is the make and model number of your amplifier? Do you have any pictures of the setup and how you have it wired?
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Old 12-14-2009, 10:05 AM
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alpine mrp-m450 using rca cables only has 1 pos and 1 neg terminal. Is there a way i can check to see if I'm getting juice to the pos and neg connections.
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Old 12-14-2009, 10:14 AM   #26
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alpine mrp-m450 using rca cables only has 1 pos and 1 neg terminal. Is there a way i can check to see if I'm getting juice to the pos and neg connections.
Yes. As you should. You need to tune your amplifier to your setup. You need a digital multimeter. The equation works out to square root(400*2). 400 being the watts you want to output, and 2 being the ohm load your amp will see.

So the sqrt of 800 = 28.28v. This is how you set the input sensitivity or "gain" of your amplifier.

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Old 12-14-2009, 10:22 AM
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I'll check them after work and report back
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Old 12-14-2009, 10:33 AM   #28
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Did you have your amplifier hooked up to your sons subs running off your deck in your jeep? I think the problem could be as simple as the subwoofer channel on your head unit is turned off or turned way down.
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Old 12-15-2009, 09:41 AM
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Here's the deal. The sub wont work unless I use my son's amp wired bridged. It won't work on either amp just using a pos. and neg. I thought maybe the sub was less than 2 ohms which would make my amp unstable but it is 2.3 ohms. Any thoughts?
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Old 12-15-2009, 09:48 AM   #30
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Yes. I need exact pictures of your setup. Guessing isn't going to do any good.


You didn't answer my questions. Did you ever, at any point, get a subwoofer to work off your amp in your jeep?

Did you wire your amplifier in your jeep and check the output voltage like we discussed?

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