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2000 F150 - Have one sub. Want Another

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=66706
Printed Date: September 26, 2022 at 2:48 PM


Topic: 2000 F150 - Have one sub. Want Another

Posted By: mrmsudawgs
Subject: 2000 F150 - Have one sub. Want Another
Date Posted: November 20, 2005 at 10:58 PM

I already have one sub in my truck and I really like it but I'm getting the itch to upgrade again. I'd like to add a second sub under my console like those JL Stealth Box enclosures that fit under the console between the front seats. However, I am concerned about wave cancellation and/or poor imaging. Does anyone have any experience with putting subs in different locations? What should I watch out for?

Thanks,
Mike


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2000 F150 Supercab Lariat, Alpine CDA-9831, Polk MMC570 in Doors, One Polk MM2104 Sub, One Polk Carbon C400.4 Amp.

John 3:16



Replies:

Posted By: jumpn
Date Posted: November 21, 2005 at 2:39 AM
I don't know about the noise cancellation issues, but I had the JL stealthbox in my 2000 F150, and I really enjoyed it.  I sold my truck over a year ago, and have been looking to sell the stealthbox.  It has a 10W3d4 dual voice coil sub in it.  I would sell it to you for less than half of what they are new.  email me if interested, jorourke3@cox.net 

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2004 Saturn vue, Alpine 9811, jl 300/4, bazooka 8" subs X 2, bazooka 6.5 comps.




Posted By: menace2sobriety
Date Posted: November 21, 2005 at 3:36 AM
youre imaging should actually improve. as far a cancellation. im not sure. and i believe you alpine has bass focus. and that might play a factor in the imaging. what im saying im not sure how to set up the time delay for the subs in two different locations. but there are other forum members here with vas knowledge.  im just an upper class trailer trash installer.posted_image

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Posted By: mrmsudawgs
Date Posted: November 21, 2005 at 4:38 PM
Thanks for the offer jumpn. I might take you up on it but I can't do it before Christmas. Short of funds right now. Is it a sealed or ported enclosure?

As far as imaging goes - I know that subs are not directional anyway but cancellation is always possible. The bass focus funcion on the Alpine head unit is somewhat cryptic to me. I do not understand how or why to use it. I mean, what is the difference between bass focus and time correction? I only have one sub so what is there to focus?

Mike


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2000 F150 Supercab Lariat, Alpine CDA-9831, Polk MMC570 in Doors, One Polk MM2104 Sub, One Polk Carbon C400.4 Amp.

John 3:16




Posted By: jumpn
Date Posted: November 21, 2005 at 11:11 PM

It is a sealed enclosure. Check out https://mobile.jlaudio.com/products_stealthbox_detail.php?fit_id=1384

for information.  The subwoofer control on your alpine should be similar to mine, (alpine 9811) in that I believe you can change how the bass presents itself in your vehicle, IE more forward near the front of the car,  more diminished if you don't want big boom, etc.  You can also adjust the amount of signal sent to your sub using the subwoofer level control.  Mine is the big dial, push it in, and SW Level will appear on your display.  Adjust from 0 to 15, whatever mood you are in.  You can also adjust the phase that the sub plays, to further fine tune your system.   Let me know after Xmas if still interested in the box. Later, Jumpn



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2004 Saturn vue, Alpine 9811, jl 300/4, bazooka 8" subs X 2, bazooka 6.5 comps.




Posted By: technotom
Date Posted: November 22, 2005 at 3:46 PM
Mike,

I recently responded to another similar question. Here is the short answer: Get the stealth box and ditch the other one. The JL stealth is DESIGNED to give optimum performance in your immediate environment (read - your truck's cab space). Any second device WILL create interference, worse in fact, than high frequency drivers because low frequencies are nearly omnidirectional. Cancellation at some frequencies is a certianty, not a "maybe".

If the JL doesn't give you enough output, resign yourself to a custom box that, depending on who designs it and what drivers you use, may or may not give you more output at the frequencies you desire.

Make sure you have enough "real" watts to drive the box without clipping the amp. This is the single biggest reason drivers are damaged. Under-powered!

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Tom




Posted By: mrmsudawgs
Date Posted: November 22, 2005 at 9:45 PM
That is a good point. Thanks for the advice. I do have one other problem.. Where am I going to put that extra amp? I suppose under the passenger seat. I just hate putting amps under the front seats....maybe I'll build an amp rack to stack two amps under the 30 seat behind the drivers seat. How can I spend that kind of jingle without my wife finding out? Hmmmmm. Going to be tough.

Thanks again!

Mike


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2000 F150 Supercab Lariat, Alpine CDA-9831, Polk MMC570 in Doors, One Polk MM2104 Sub, One Polk Carbon C400.4 Amp.

John 3:16




Posted By: menace2sobriety
Date Posted: November 23, 2005 at 12:22 AM
mrmsudawgs wrote: How can I spend that kind of jingle without my wife finding out? Hmmmmm. Going to be tough.

buy her something nice at the same time.posted_image        or get her totally drunk and right before she passes out tell her your buying another amp.

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Posted By: mrmsudawgs
Date Posted: November 23, 2005 at 9:37 AM
Well, Christmas is around the corner and I have to get her something anyway. Might as well be a 6 pack of colt 45. No wait, I'll splurge and go for the Red Dog!posted_image

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2000 F150 Supercab Lariat, Alpine CDA-9831, Polk MMC570 in Doors, One Polk MM2104 Sub, One Polk Carbon C400.4 Amp.

John 3:16




Posted By: Alpine Guy
Date Posted: November 23, 2005 at 10:28 AM
Id say sell off your amp and sub, then start up a new box with a fiberglass bottom to squeeze every bit of air space out of that truck, separate the 2 chambers in the perfect spot to give you 2 chambers with the same air space, then search for subwoofers than will fit the size and air requirements you have once the box is near completed. Then get yourself a nice big amp to power them and mount her to the ceilingposted_image

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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.




Posted By: DYohn
Date Posted: November 23, 2005 at 10:29 AM
You mentioned "imaging."  Imaging is N/A for subwoofers as long as they are properly crossed over.  Frequencies below 80Hz are non-directional so they will not affect stereo imaging in any way.  As long as your two woofers are receiving the same mono signal and are located in approximately the same location, you should not notice any cancellation effects.  What you gain by adding a second subwoofer at the same power level as the first is an SPL increase of approximately 3db, with a potential for increased cabin gain which can get you a net increase probably around 6db.  If this is what you're looking for, then go for it.

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Posted By: customsuburb
Date Posted: November 23, 2005 at 4:37 PM

What I would do is buy this enclosure and sub from JL. https://mobile.jlaudio.com/products_stealthbox_detail.php?fit_id=1383 It fits perfectly in your truck and leaves enough room for your amp to be mounted under the seat too. The jl 10w3v2 is rated for 300 watts continuous but the rear channels on your amp bridged should work fine. If you need more volume you can always add a dedicated sub amp later on and use your Polk amp to run your coxials in your truck.

The only problem you might run into is too low of an ohm load with the JL sub since the DVC 6 ohm version is in the stealthbox.






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