what subs for my amp? help!

[skate enjoi]

i have a rockford fosgate 1501db amp... i think i have 2 12inch audiobahn subs on the way..

i cant find the specs on the amp but it is said to do 750watts x1 at 4ohms and 1500watts x1 at 2ohms.... can i run 2 12s off this amp?? or will that fry the amp? also willl those speakers work?? any help would be cool, thanks

the specs for the subs are
*12" High Performance Subwoofer
*60 oz. Strontium Magnet
*500 Watts RMS / 1000 Watts Max
*Frequency Response: 25 Hz - 800 Hz
*Efficiency: 92.9 dB
*EPDM Rubber Surround
*Molded & Texture Injected Poly Cone
*2 Inch 4-Layer ASV Voice Coil
*Dual 4 Ohm Voice Coils
*2 Ohm or 8 Ohm Operation
*Lug Lock Terminals

 

[fr33b1rth]

the subs listed are dual 4 ohm. that means that you have to run them at a mono 4-ohm or mono 1-ohm load. the amplifier you are using (1501bd) is only stable down to 2-ohms. that means that you have to run the subs at a 4-hm load. meaning that you will get 375W RMS to each sub... not the best chose of subs if you already have the amp...

 

[skate enjoi]

what subs would be best, and cheapest? those audiobahn subs say that they can run 2 or 8ohm loads?

also how do you hook them up with only one channel???

 

[fr33b1rth]

right, 2ohm+2ohm (wired in series) = 4ohm. so with those audiobahn's connected in series your amp would be running at 4 ohms.

I really like these subs:
http://www.sonicelectronix.com/item_2172.html

i own a pair and have them in a 1.2cu ft box per sub in a ported enclosure and they hammer. and are extremly accurate, plus cheap! the amp that you have could destroy them, so if you get them be sure to have it tuned properly.

If you have the money i would get these:
http://www.cardiscountstereos.com/catalog page.asp?Product+#=FUBR12

they are dual 2ohm so you would end up with a mono 2-ohm load if you got two of them, and your amp would be just right for them. they are LOUD.

 

[skate enjoi]

hey,

i just remembered that a friend of mine works at best buy.... so many i will have to go buy some new subs... he can get them at like over 60 percent off.... what ohms should the subs be that i buy?? im sayin if i use two 12s, what ohms and specifications do they need to be?? also how do i run 2 12s off my 1 channel amp???

 

[DGajre777]

Since you said you want to run 2 12", you have 2 options.

Option 1:

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For this one, you need to get Two 4 Ohm Single Voice Coil (SVC) subwoofers.

Option 2:

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For this one, you need to get Two 2 Ohm Dual Voice Coil (DVC) subwoofers.

If your amp puts out 1500 Watts RMS x 1 @ 2 Ohms, you could get subs that are rated at anywhere between 600-800 Watts RMS EACH. If it is DVC sub, then it would be 300-400 RMS per voice coil. There are not many companies out there making 800 Watts SVC Subwoofers.

I looked at Bestbuy.com and did not find any subs in the range above that were 2 Ohm DVC or 4 Ohm SVC. You might want to try some other place to buy your subs.

I found 3 at Crutchfield.com that seem like something you are looking for:
1) Kicker Solo-Baric L5 05S12L52 - $249
12" subwoofer with dual 2-ohm voice coils

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» 12" subwoofer with dual 2-ohm voice coils
» SoloKon aluminum-treated composite cone with Santoprene rubber surround
» frequency response: 20-100 Hz
» power range: 50-600 watts RMS (300 watts per coil)
» peak power handling: 1,200 watts
» sensitivity: 87.9 dB
» top-mount depth: 6-7/8"
» sealed box volume 0.8-2.0 cubic feet
» ported box volume: 1.75-3.25 cubic feet
http://www.crutchfield.com/S-TnPrAAMzUHa/cgi-bin/ProdView.asp?g=520&I=2065S12L52

2) Rockford Fosgate T112D2, Power Stage 1 - $399
12" subwoofer with dual 2-ohm voice coils

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12" subwoofer with dual 2-ohm voice coils
aluminum parabolic woofer cone with rubber surround
cast aluminum basket
frequency response: 31-250 Hz
power range: 150-600 watts RMS (300 watts per coil)
peak power handling: 1,200 watts
sensitivity: 85.7 dB
top-mount depth 6-3/4"
sealed box volume: 1.0-1.5 cubic feet
ported box volume: 1.25-2.25 cubic feet
http://www.crutchfield.com/S-TnPrAAMzUHa/cgi-bin/ProdView.asp?g=520&I=575T112D2

3) Rockford Fosgate T212D2, Power Stage 2 - $699
12" subwoofer with dual 2-ohm voice coils

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12" subwoofer with dual 2-ohm voice coils
aluminum parabolic woofer cone with rubber surround
cast aluminum basket
frequency response: 28-250 Hz
power range: 150-1,000 watts RMS (500 watts per coil)
peak power handling: 2,000 watts
sensitivity: 85 dB
top-mount depth: 9"
bottom-mount depth: 9-7/16"
ported box volume: 1.5-2.5 cubic feet
http://www.crutchfield.com/S-TnPrAAMzUHa/cgi-bin/ProdView.asp?g=520&I=575T212D2

You might find these subs cheaper at other places.

Here is some reading material:

Here are some key specs to consider:
Power — If you want a system that really booms, there's no substitute for plenty of power. Pay attention to RMS power ratings, not peak power ratings. RMS ratings measure continuous power handling or output and are a much more realistic measure than peak power. Make sure you match the sub's power handling to your amp's power output.

Sensitivity — Sensitivity goes hand-in-hand with power to achieve high output. A sub that has a higher sensitivity rating requires less power to produce the same amount of sound as a model with a lower sensitivity rating. This is normally referred to as db.

Frequency range — Frequency range gives you an idea of how low a sub can play. Keep in mind, though, that the actual performance of the sub can depend on a lot of variables, like the box type it's mounted in.

Enclosure type — The type of enclosure a sub is mounted in will have a big effect on the type of sound it produces. In general, sealed boxes give you the deepest, most accurate sound, while ported and bandpass enclosures produce more volume.

Number of voice coils — Dual voice coil subwoofers are a popular choice among car audio enthusiasts who want more flexibility in wiring their sound systems. While typical subwoofers have a single voice coil, dual voice coil (DVC) subwoofers use two separate voice coils, each with its own connections, mounted on one cylinder, connected to a common cone.

Size of the woofer — It's a never-ending question — what size subwoofers play loudest and lowest? It's not an easy question — you need to consider sensitivity, enclosure type, and available power. If your ultimate goal is to have a system that plays loud and low, and space isn't an issue, go for the biggest subs. But don't underestimate smaller subs. Properly powered and in the right enclosure, smaller subs can put out plenty of sound.

Impedance — Most subwoofers are rated at 4 ohms impedance, but 2-ohm, 8-ohm, and dual voice coil subwoofers have become commonplace. When you've chosen a subwoofer, look for amplifiers that will match up to your sub in terms of power rating and impedance. There are a wide variety of amps available, so you shouldn't have any trouble finding one that will bring out the best in the sub you've chosen.

 

[fr33b1rth]

just rember that i am trying to stay in your price range....

the first sub that i listed usually retails for about $100/sub, that site sells them for $40...

the second sub best buy used to sell for $179.99, that site sells them for $69.99...

i have ordered from both of those sites, used both of those subs. neither one of them are bad, they are both exceptional subs. if you just listen to rap music, then the kicker L7 isn't a bad choice but they do suffer from an excess of mechanical distortion, less with this years cone, but still too much for my taste. Paper cones tend to produce more "real life" sounds better, but can distort when synthetic (sine waves, and rap music) bass is played, but generally not enough to notice if the cone is designed well.

Also take into consideration the kicker L7 can only play up to 100hz. Bass guitar's play MUCH higher than 100hz 80% of the time. Like i said, the kicker is only good if you want LOUD bass in a very specific frequency (30hz-85hz, which is most rap music)

 

[91talon27]

It also depends on your own personal preference me I will only buy Audiobahn subs for any of my cars. They have always sounded great to me and I have never had a problem with them. I currently have 2 10 inch flamed compression series subs running to a 812 watt SPL amp. This setup hits really hard. My system has converted many a JL Audio fan to Audiobahn.

 

[skate enjoi]

i actually have some 12inch audiobahn subs but the voice coils are blown ..... so i was thinking about getting some of these...

http://cgi.ebay.com/2-KICKER-12-600...824663853QQcategoryZ39777QQrdZ1QQcmdZViewItem

what do you think??? i heard these hit real hard....

 

[DGajre777]

Damn dude, didn't you read anything I wrote above???

You need 2 Ohm DVC subs, not 4 Ohm DVCs. Also since they are 600Watts MAX, that comes to about 300Watts RMS each. Total of 600Watts RMS. Your amp will put out 1500Watts RMS. If you not going to use all the power of the amp, sell it and get a smaller one and then buy subs.

 

[skate enjoi]

those were 600 watts rms each... so it would be 1200 watts total... and im pretty sure i can get them in dual 4 ohm or dual 2ohm, i just wasnt sure if my amp could be run at 1ohm or not??? can it?? and how many watts would it be pushin at 1ohm??

 

[DGajre777]

In response to your PM:
According to the specs below on EBAY, the amp is not 1ohm stable, which means you cannot wire it in 1 ohm load. Try finding the manual for the amp, it should state on there if it is 1 ohm stable or not. Also, that amp has a 150Amp fuse. That's a lot of current, you'll probably need a high output alternator for that.
http://cgi.ebay.com/ebaymotors/ROCK...38638QQitemZ8011154762QQrdZ1QQsspagenameZWD4V

If you wire the Two 2Ohm DVC subs, you'll get a 2 Ohm load total (see picture above in my long post).

 

[skate enjoi]

ok well i plan on gettin dvc subs, so does that mean that i can only get dual 2ohm subs??? i just wanna cut my search down, and make it as specific as possible.... lmk thanks

 

[DGajre777]

ok well i plan on gettin dvc subs, so does that mean that i can only get dual 2ohm subs??? i just wanna cut my search down, and make it as specific as possible.... lmk thanks

If you want to get 1500Watts RMS from your amp, you need to get Two Dual 2Ohm Subs and wire them like this:

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If you get Two Dual 4Ohm subs and wire them like the pic below, your total load will be 1ohm. As I mentioned in my PM to you, your amp is not 1ohm stable (unless you found documentation telling you it is 1ohm stable).

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Basically you are stuck with getting Two Dual 2Ohm Voice Coil subs or Two Single 4Ohm Voice Coil subs. If you change your mind and decide to get SVC subs, you'll have to wire them like the pic below to get a 2ohm total load.

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I hope this helps.

 

[skate enjoi]

http://cgi.ebay.com/ebaymotors/Rock...38638QQitemZ8010083947QQrdZ1QQsspagenameZWDVW



can his be run at 1ohm because it is modified or did the modified amps only raise the watts????

 

[DGajre777]

http://cgi.ebay.com/ebaymotors/Rock...38638QQitemZ8010083947QQrdZ1QQsspagenameZWDVW

can his be run at 1ohm because it is modified or did the modified amps only raise the watts????

Well according to the ad, "These amps in standard form are good for 1600-1700watts RMS in 2 ohms, in 1 ohm or less they should see around 2000-2500watts RMS"

Having said that:
1) If you get Two 2 Ohm DVC subs, each sub will see about 800-850 Watts RMS, if you wire it like the first picture above.
2) If you get Two 4 Ohm DVC subs, each sub will see about 1000-1250 Watts RMS if you wire it like the second picture above.

If you haven't bought it yet, I'd look for a different amp. The 150AMP fuse is going to be hard on your stock alternator.

 

[skate enjoi]

would a capacitor help?? i dont know what they do, but i can get new ones for cheap from best buy cuz my friend works there... but yeah i already have the amp.. i got it for a hell of a deal.... let me know anything that would help thanks

 

[DGajre777]

No, a capacitor won't help, neither will a second battery. A capacitor stores energy for spikes to prevent diming headlights etc, and a second battery will give you more time to play with your car off.

DSM alternators are between 75-90amps (since we don't know what year/type DSM you have). The 150 fuse on the amplifier will take about 75amps of current. In order to provide enough juice for the amp and your car, you'll need an alternator that supplies between 120-150amps.

Why do you need all that power? You planning to get into SPL competitions with those subs and that amp?

 

[skate enjoi]

###### not... just something that hits really hard...... i got the amp for it... why not get the best subs i can get? im gonna be spending money either way...

 

[DGajre777]

###### not... just something that hits really hard...... i got the amp for it... why not get the best subs i can get? im gonna be spending money either way...

Just get a high output alternator.

 

[fr33b1rth]

the kicker L5 and L7 series hit really hard, but are only good if you listen to rap ONLY. they don't play above 80hz well, and the kicker L7 isn't even rated to play above 100hz. All that's fine if you only listen to rap because most of rap's bass is between 40hz and 75hz while most other music has bass from 60hz to 165hz.

Don't mistake me and say that i'm just dissing kicker because i don't like them, because i do like kicker. Their L5 and L7 series do exactly what they are made for. They were made to play really low tones really loud and they do that well, but because they were designed to do that, they can't play high notes. Picking a sub always depends on the music you listen to.

These subs are INSANE:
http://www.sonicelectronix.com/item_2421.html

They sound awsome, have roughly the same surface area of a kicker L5 or L7 and roughly DOUBLE the excursion of the kicker L5 which means it moves more air, which means it's louder.

I've never had a problem with hifonics, and they have never disappointed me.

Basicly, stay away from the kicker square subs unless you only listen to rap.