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3 ohm subwoofer and a dual 2 ohm?

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=78335
Printed Date: April 23, 2024 at 7:22 PM


Topic: 3 ohm subwoofer and a dual 2 ohm?

Posted By: concept
Subject: 3 ohm subwoofer and a dual 2 ohm?
Date Posted: May 26, 2006 at 8:09 PM

what kind of amplifier(s) would i need to run a 15" concept svc 3 ohm, and a 10"  xt 104 concept dvc 2 ohms?



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concept



Replies:

Posted By: DYohn
Date Posted: May 26, 2006 at 8:15 PM
My advice is use one or the other, not both.

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Posted By: forbidden
Date Posted: May 27, 2006 at 12:50 AM
I agree, if you are going to use both sizes of subs, you are going to need a bandpass crossover and a separate amp to drive each different size of sub.

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Top Secret, I can tell you but then my wife will kill me.




Posted By: concept
Date Posted: June 02, 2006 at 5:27 PM

ok but will it have an adverse effect if i ran them both off oe one amp?

like i mean will it either blow up the amp, or possibly one of the subs?



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concept




Posted By: DYohn
Date Posted: June 02, 2006 at 5:29 PM
it will sound really bad.  Use the 15" and sell the 10".

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Posted By: concept
Date Posted: June 02, 2006 at 6:50 PM

alright...ill do that....now what do you suggest for an amp then..

if you now of a company named audison..i talked to the guy who builds them.. and he said to run a mono with 1000 watts.

what do you think?



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concept




Posted By: aznboi3644
Date Posted: June 02, 2006 at 7:58 PM
depends on your sub, enclosure, and power handling of your sub.

How about you tell us the specs of your 15




Posted By: concept
Date Posted: June 02, 2006 at 8:45 PM

svc 3 ohm 500 rms 1000 max 15"

i have it in a 17 by 17 by 12.75 made out of 3/4 mdf

another question?....is the box too small or too larger?



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concept




Posted By: DYohn
Date Posted: June 02, 2006 at 10:22 PM
Audison is an outstanding company.  One of their amps would be a fine piece of gear for anyone.

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Posted By: aznboi3644
Date Posted: June 02, 2006 at 11:20 PM
Well post the sub model number or tell us the manufacturers recommended enclosure volumes.

Is that 17x17x12.5 internal measurements or external.




Posted By: concept
Date Posted: June 02, 2006 at 11:29 PM

it is model cft-15( if that helps)

and it is 17*17*12 3/4



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concept




Posted By: killer sonata
Date Posted: June 02, 2006 at 11:29 PM
Personally i would say stick with the 10". I prefer them to a 15" anyday. Ofcourse I look for sound quality and not sound pressure level. Typically, the smaller the sub, the more accurate it is going to be. Unless you fork out some big bucks for a top end 15", its going to sound sloppy. Kicker is a great example of sloppy sounding bass.




Posted By: concept
Date Posted: June 02, 2006 at 11:32 PM

yea i was thinking that...keep the 10" and sell the 15"

which do you think would be better for alittle more than SQ like a little more bass?



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concept




Posted By: concept
Date Posted: June 02, 2006 at 11:38 PM
sorry guys.. i did the calculations and it came out to be 1.53 is the interior volume

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concept




Posted By: jeffchilcott
Date Posted: June 03, 2006 at 7:43 AM
killer sonata wrote:

Kicker is a great example of sloppy sounding bass.


This is the perfect example of an amature box builder.
Tight, Low, Clean Bass is all we are getting from our kickers!

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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: killer sonata
Date Posted: June 03, 2006 at 8:29 AM

jeffchilcott wrote:

killer sonata wrote:

Kicker is a great example of sloppy sounding bass.


This is the perfect example of an amature box builder.
Tight, Low, Clean Bass is all we are getting from our kickers!

I just prefer quality products like JL and MTX for my subs thats all. Im guessing you think infinity is high quality door speakers too huh?





Posted By: DYohn
Date Posted: June 03, 2006 at 10:10 AM

killer sonata wrote:

Personally i would say stick with the 10". I prefer them to a 15" anyday. Ofcourse I look for sound quality and not sound pressure level. Typically, the smaller the sub, the more accurate it is going to be. Unless you fork out some big bucks for a top end 15", its going to sound sloppy. Kicker is a great example of sloppy sounding bass.

This is a myth and is completely incorrect.  There is nothing inherently more "sloppy" or "tight" that is created by cone size.  It's all in the enclosure.



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Posted By: DYohn
Date Posted: June 03, 2006 at 10:18 AM
concept wrote:

it is model cft-15( if that helps)

and it is 17*17*12 3/4


Your enclosure is on the small size for a 15" woofer at 1.5 cuft.  It could be used, however, and will sound a little boomy with peaks up around 60Hz, but it'll be OK.  I'd recomend filling it with polyfill (stuff at least a pound in) and throw about 500 watts at your CFT-15.  HERE's the specs in case you don't have them.



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Posted By: concept
Date Posted: June 03, 2006 at 12:30 PM
alright thankz guy...

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concept




Posted By: killer sonata
Date Posted: June 03, 2006 at 12:33 PM
DYohn] wrote:

P>
killer sonata wrote:

Personally i would say stick with the 10". I prefer them to a 15" anyday. Ofcourse I look for sound quality and not sound pressure level. Typically, the smaller the sub, the more accurate it is going to be. Unless you fork out some big bucks for a top end 15", its going to sound sloppy. Kicker is a great example of sloppy sounding bass.

This is a myth and is completely incorrect.  There is nothing inherently more "sloppy" or "tight" that is created by cone size.  It's all in the enclosure.


With most manufactures they use the same motor for the 10" 12" and 15" on a woofer of the same series. That being said, the 10" will be more accurate than the 15" because there isnt as much surface area for error. In other words, the motor will push the 15" more unevenly than the 10". Or atleast this is what I have been told time and time again by numerous credible people.





Posted By: DYohn
Date Posted: June 03, 2006 at 1:44 PM
killer sonata wrote:

DYohn] wrote:

killer sonata wrote:

Personally i would say stick with the 10". I prefer them to a 15" anyday. Ofcourse I look for sound quality and not sound pressure level. Typically, the smaller the sub, the more accurate it is going to be. Unless you fork out some big bucks for a top end 15", its going to sound sloppy. Kicker is a great example of sloppy sounding bass.

This is a myth and is completely incorrect.  There is nothing inherently more "sloppy" or "tight" that is created by cone size.  It's all in the enclosure.


With most manufactures they use the same motor for the 10" 12" and 15" on a woofer of the same series. That being said, the 10" will be more accurate than the 15" because there isnt as much surface area for error. In other words, the motor will push the 15" more unevenly than the 10". Or atleast this is what I have been told time and time again by numerous credible people.


It is simply wrong.  Whoever told you this is spreading bad information.  I refer you to THIS white paper, as one source.  There are many others.



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Posted By: jeffchilcott
Date Posted: June 03, 2006 at 1:56 PM
killer sonata wrote:

jeffchilcott wrote:

killer sonata wrote:

Kicker is a great example of sloppy sounding bass.


This is the perfect example of an amature box builder.
Tight, Low, Clean Bass is all we are getting from our kickers!

I just prefer quality products like JL and MTX for my subs thats all. Im guessing you think infinity is high quality door speakers too huh?





Killer, I am guessing you have not done your research before you call someone out.    I am quite sure I have more money wrapped into amps just to sit around then you could ever image having in your car.

But then again I just build world champion caliber vehicles, so what do I know HUH?     

Word of advice, when you see someone in this fourm with 4 of 5 stars next to thier name, dont bother calling them out.



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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: jazzcustom131
Date Posted: June 03, 2006 at 2:50 PM
Dyohn, the "white papers" you poiinted him to, where can I find more things like that?

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Greed is for amateurs.

Disorder,chaos,anarchy now THAT is fun!!




Posted By: concept
Date Posted: June 03, 2006 at 3:23 PM
ok DYhon by the amount of  stars and your information you seem like you know your stuff..so im going to take your advice

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concept




Posted By: killer sonata
Date Posted: June 03, 2006 at 11:02 PM
I thought i made it clear that the info I was relaying to you guys is just what I have always been told. Im not trying to pick fights or anything. Plus no offense, but I find it hard to believe that the "guys with the stars" next to their names are NEVER wrong. Everyone is wrong sometimes. If you want to critisize me please do it as constructive critisism. I dont take kindly to getting bashed. Anywho... Thanks for that white paper! That is some great info! I will be sure to spread the word to those who have told me otherwise.




Posted By: jeffchilcott
Date Posted: June 04, 2006 at 7:32 AM
Sorry for going off sonata,   trying to turn around this whole Kicker L7's are dirty thing.   Thats why I have been posting boxes I have came up with for public use, hoping to get quite a few people to use them for real potential.

We do make our mistake from time to time, but normally the gang of gold and blue starts will mock the other senior members for life if we mess up   haha

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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: killer sonata
Date Posted: June 04, 2006 at 12:18 PM

Hey no problem Jeff. Im sure you have made some pretty impressive boxes for kickers. Do you have links to pictures for them anywhere? From my personal experiences I have yet to hear a kicker I licked. Especially the square ones. I know you made a comment earlier about my amps and what not. Im not trying to revive a dead arguement. I just want to let you know what I have in my car so you can see Im not totally a noob to car audio. Ive got a MTX 1501D mono, a MTX 564 4ch, 2 x MTX 202 2ch, 2 redtop optima batteries, street wires 1/0ga, 2 x MTX 8500 12" subs, 1 MTX rt10 10" sub, 2 x  JL6W0 6" subs, focal access series 2 way component, and a set of focal polyglass 3 way components.

Ill be sure to keep my eyes open for the mistakes the ppl with stars make. That will be fun. lol





Posted By: aznboi3644
Date Posted: June 04, 2006 at 6:05 PM
Jeff so you post up the boxes you have designed? Cuz I am thinking about getting only 1 12 inch L7 and if you could give me some box recommendations to get the best outta this sub that would be great.




Posted By: concept
Date Posted: June 04, 2006 at 7:23 PM
okay sorry guys now im looking at getting 2 memphis PR15......what kinda box do you suggest?

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concept




Posted By: killer sonata
Date Posted: June 04, 2006 at 8:05 PM
Any subwoofer you buy will generally come with a spec sheet. It will give you the recommended box dimensions for both ported and sealed boxes. These are what the company who made the sub tested and came up with. Those are always good to use unless you want something more custom. If that is the case, make your custom box but use the recommended box volume as a guide. 




Posted By: concept
Date Posted: June 04, 2006 at 9:37 PM
alright thanks

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concept





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