one sub two amps?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=83483
Printed Date: June 07, 2024 at 7:28 PM
Topic: one sub two amps?
Posted By: gcorrea
Subject: one sub two amps?
Date Posted: September 28, 2006 at 11:26 PM
can you wire two identical amps to a single sub.
for examlple two 350 watt mono amps into a kicker L7 each amp into a coil at 4ohms. is it possible. would the speaker have any negative side effects to this wiring? would each coil work correctly? anyone ever tried this before?
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gcorrea
Replies:
Posted By: Clean Install
Date Posted: September 28, 2006 at 11:48 PM
never tried it but there are amps out there i know crossfire has one u can use 2 amps and one is a slave amp ------------- If we learn from each success and
each failure, then we can improve ourselves
Posted By: i am an idiot
Date Posted: September 29, 2006 at 5:14 AM
Yes you can and yes it has been done many times.
Posted By: jeffchilcott
Date Posted: September 29, 2006 at 10:09 AM
I would highly not reccomend trying to run 2 amps to a sub when the amps are not strappable.
Thier are alot of amps that are...what type of amps do you have?
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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: aznboi3644
Date Posted: September 29, 2006 at 3:45 PM
What if you have a dual voice coil sub and you have two amps??
Like one amp to one coil??
Possible...not strapping
Posted By: jeffchilcott
Date Posted: September 29, 2006 at 5:26 PM
possible, but without a very very accurate meter to set the gains on both amp and make sure 100% that they have less then 1% variance, then it is very very possible to destroy a woofer
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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: Flakman
Date Posted: September 29, 2006 at 5:58 PM
nouseforaname wrote:
i don't believe it will damage anything. Dan Wiggins wrote a paper where he discussed this. he even mentioned you can wire one of the coils out of phase with absolutely no negative side effects. they would simply cancel each other out.
...and actually, having them out of phase is even safer than not. The sub actually should move less which means less heat generated and less excursion. Of course this leads to less bass. ------------- The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
Posted By: dstang24
Date Posted: September 29, 2006 at 6:21 PM
Wouldn't connecting them in opposite polarity be deadly to the speaker??? It would still move current through the speaker while the speaker wasn't moving. That means there is heat building up from the electrical current and no movement of air within the vent, causing the speaker to heat up very rapidly. >> Eventually smoking the coils. That's just my logical deduction, I could be wrong... -Dstang24 ------------- Team Edge Audio
Posted By: i am an idiot
Date Posted: September 29, 2006 at 6:31 PM
Very accurate Dstang. The guy has a Dual voice coil woofer as he mentioned in the original post. How did we get to hooking coils up out of phase.
Posted By: gcorrea
Date Posted: September 30, 2006 at 12:10 AM
to set the gain as close as possible to each other, i was going to turn the amps to max setting and using the crossovers gain to drive both of the amps at the same level instead of trying to match each amp individually. is this a good idea? they are two phoenix gold 2350 rated at 350 watts mono rms, running a single dual voice coil 12" kicker L7. the reason im only using one L7 is because i dont have enough air space under the rear seat of my nissan titan. if i build the box to fit perfectly under the seat and out of the way, i yield just about 2.2 cubic feet. just enough for one sub and the bass im looking for. my other option is to run two 12" kicker comp vrs, one to each amp, but each sub would sit in about 1 to .85 cubic feet. kind of small if you ask me for some descent bass. what should you guys think i should run with. what set up. would you think yield the most bass. thanks for all of your input.
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gcorrea
Posted By: gcorrea
Date Posted: September 30, 2006 at 12:22 AM
the reason im thinking of using a single L7 into two amps is because of air space under the seat of my nissan titan crew cab. if i build the box to fit just right i yield about 2.2 cubic feet. if i go with the other set up i was thinking of, using two kicer 12" comp vrs i would yield about 1 to .85 cubic feet for each sub, not enough for the bass im looking for. which set up do you guys think i should go with for good bass respond. the single kicker L7 12" sub with an amp on each coil sitting in 2 cubic feet, or the two 12" kicker comp vrs sitting in about 1 to .85 cubic feet with a dedicated amp to each sub. keep in mind i want the most bass i can get. im using two phoenix gold 2350 amps rated at 350 watt rms mono. if i run the L7 i was thinking of setting the amps gain to max and using the electronic crossovers gain to match the amps as close as possible. what do you think. thanks in advance and for all th input the will help me decide oin which setup to run.
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gcorrea
Posted By: aznboi3644
Date Posted: September 30, 2006 at 1:54 AM
Setting the gains to max and TRYING to use the crossovers as a "gain" = bad idea
Set the gains correctly.
Posted By: haemphyst
Date Posted: September 30, 2006 at 2:40 AM
jeffchilcott wrote:
possible, but without a very very accurate meter to set the gains on both amp and make sure 100% that they have less then 1% variance, then it is very very possible to destroy a woofer
Jeff, Jeff, Jeff... we've been over this, brother... It is PERFECTLY acceptable to run one voice coil of a DVC woofer to one amplifier, and the other coil to ANY other amplifier...
Here's the article... It is PERFECTLY safe to run one amp to each voice coil... Go fot it. ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: dstang24
Date Posted: September 30, 2006 at 5:07 AM
jeffchilcott wrote:
| possible, but without a very very accurate meter to set the gains on both amp and make sure 100% that they have less then 1% variance, then it is very very possible to destroy a woofer |
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I believe the proper way to set these up is to use a very accurate meter to test the AC voltage output of each amp and get them to the same value at about 60-75% gain. Make sure you use a test tone as close to the speakers FS as you can to test this voltage too... NO MUSIC! Correct me if I'm wrong. ------------- Team Edge Audio
Posted By: fakepete
Date Posted: September 30, 2006 at 7:55 AM
The gain on each amp should be set just like a single amp set-up, as high as possilble without clipping. They don't even need to be set the same as long as there is no clipping. You could use a 350w amp on one coil and a 100w amp on the other coil. As long as both amps are outputing the same signal and not clipping it does not matter where the gains are set.
Posted By: haemphyst
Date Posted: September 30, 2006 at 8:00 AM
dstang24 wrote:
I believe the proper way to set these up is to use a very accurate meter to test the AC voltage output of each amp and get them to the same value at about 60-75% gain. Make sure you use a test tone as close to the speakers FS as you can to test this voltage too... NO MUSIC!
Correct me if I'm wrong.
You're wrong.  You can run two different signals into each of the two different amplifiers, and as long as you never overpower the woofer, you are still perfectly safe. You could use one 1000 watt amp on one voice coil, and one 500 watt amp on the other voice coil, 180° out of phase, crank 'em both, and you'll STILL have ZERO failure rate, as long as you do not overpower the woofer. READ THE ARTICLE from Dan Wiggins that I linked to. It's a pdf, so when you click it, and when it finishes downloading, you can even keep it on your computer for handy reference later.
IT IS PERFECTLY SAFE TO RUN TWO COMPLETELY DIFFERENT SIGNALS TO A DUAL VOICE COIL WOOFER - they do not have to be the same...
Here's the article again...
fakepete wrote:
You could use a 350w amp on one coil and a 100w amp on the other coil.
Dude... how did we think of the same example at the same time? Oh, and clip em both off... feed that sucker square waves, and as I said above, there will be NO DAMAGE TO THE WOOFER, as long as you do not overpower the woofer. Square waves and distortion don't kill woofers, POWER KILLS WOOFERS. End of story. ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: Flakman
Date Posted: September 30, 2006 at 5:01 PM
Thanks Haem! By the way...there is now a clipping sticky at the top of this forum from a recent thread. ------------- The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
Posted By: gcorrea
Date Posted: September 30, 2006 at 6:25 PM
so which of the two set ups i mentioned would any of you guys recomend, and why.
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gcorrea
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