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Getting Sub Deeper?

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=58569
Printed Date: March 29, 2024 at 1:24 AM


Topic: Getting Sub Deeper?

Posted By: Vandals909
Subject: Getting Sub Deeper?
Date Posted: June 29, 2005 at 3:58 PM

I have 2 12" idq v2's each has 300 watts to it, their enclosure each is .85 sealed in a downfiring box(this is the medium size recommended by ID). My question is how do I make these things sound deeper? Would adding polyfil help? Also they sound kind of muffled? Please help me out guys!!!!



Replies:

Posted By: Vandals909
Date Posted: June 29, 2005 at 11:48 PM
46 views and 0 replies? I'm sure someone on this site can help me out!




Posted By: nowlater123
Date Posted: June 30, 2005 at 12:26 AM

Polyfill would help a litle bit in producing lower frequencies, but not enough to notice well in your case( the box is right size).

The reason it sounds muffled might be because the box is sealed. A sealed bow produces a punchy bass more suited for jazz and classical.

Porting the box properly will make the more boomy sounds more suited for rap. The "muffled sound is to taste. It all depends on what kind of music you like.

Hope this helps.



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Kenwood all the Way!




Posted By: bryceyaworsky
Date Posted: June 30, 2005 at 1:07 AM
If response is what you want then sealed is the best way to get it.  I don't know the specs for your subs, but putting them in the largest possible box within recommended specs will give you the smoothest response.  Firing position will make a big difference as well.  Instead of downfiring, try them firing towards the back of the car placed right behind the back seat (front of the trunk).  I should also mention that if they are downfiring, you need to reverse the phase of the speakers to avoid damaging them.




Posted By: Steven Kephart
Date Posted: June 30, 2005 at 1:56 AM

As has already been said, using a larger sealed enclosure will increase the low end response of the sub.  Adding fill if there isn't any in there already will help as well.  You could also add mass to the center of the cone which will reduce the Fs.  However you will also reduce the efficiency of the sub. 

I'm a little confused though.  You say that the sub sounds "muffled", which is generally a sign of too much low end (boomy sounding).  The problem might be that you are lacking midbass, or are used to a peakier upper bass that this current design doesn't provide. 

Steven Kephart

Adire Audio



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Posted By: jstruckman
Date Posted: June 30, 2005 at 11:11 AM
bryceyaworsky:

Where did you here that you need to reverse the phase of the subs to avoid damaging subs when they are being downfired. The direction the subs are facing has nothing to do with the phase of the subs.

Jazzy

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Posted By: nowlater123
Date Posted: June 30, 2005 at 4:55 PM

How would you reverse the phase anyhow?



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Kenwood all the Way!




Posted By: jstruckman
Date Posted: June 30, 2005 at 5:20 PM
Reversing the phase means reversing the positive and negative speaker leads. Doing this to a single subwoofer set up will really do nothing. If you have two or more subwoofers and you wire one of the woofers out of phase then they would cancel each other out, basically resulting in very little bass response. With subwoofers wired out of phase, one subwoofer would move out while the other sub moves in.

Jazzy

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Posted By: oonikfraleyoo
Date Posted: June 30, 2005 at 8:04 PM
But what does that have to do with downfiring?

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Nik
Jeeputer Progress
[|||||||||||-] 90%
Check it out.




Posted By: jstruckman
Date Posted: July 01, 2005 at 10:36 AM
It has nothing to do with downfiring the subs, that is what i said in one of my earlier posts.

Jazzy

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Posted By: Chad7n7
Date Posted: July 01, 2005 at 9:50 PM

I think he has some wires crossed and is thinking of reversing polarity when mounting subs inverted.

As I too agree with the rest of you guys, you shouldn't reverse the polarity when downfiring subs.



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Posted By: stevdart
Date Posted: July 01, 2005 at 10:07 PM
I'll chime in too because I also knew he was thinking about inverted subs.  But the part about damaging something...I don't know if that's a common misconception with the casual audio fan or not, but reversing polarity on any speaker will do no harm at all.  I imagine it's like a lot of things in electronics and audio - like too low of an impedance will probably cause your amp to have a heart attack, for instance.  Things like this can be a little bit scary.  But reversing polarity on your sub, or group of subs as a whole, is not only okay but actually SHOULD be done after the install.  You want to be sure that you're getting the best sound possible with the rest of the system...and only by testing the sub by reversing polarity will you be sure it sounds the best it can be.  And if you move the sub enclosure from one spot to another, do it again.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.





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