Downfiring subs

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=54482
Printed Date: April 29, 2024 at 2:56 AM

Topic: Downfiring subs

Posted By: racer427
Subject: Downfiring subs
Date Posted: April 23, 2005 at 1:04 PM

Ok guy's,

A quick question. I am running 2 MTX MZS1004 10" subs, T/S parrameters below. I have the downfiring currently with a 2.5" space between them and the trunk floor. The question is, will this hurt the subs? I really like the sound with them firing down and, since I use the trunk all the time, I don't have to worry about anything damaging the subs.

Fs - free air resonance (Hz) 35.34

Vas (liters) 30.56

xMax - maximum excursion (millimeters) 13.5

QTS .67

Chris

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Alpine CDA-9833 HU
Diamond Audio M661 Components
MTX Thunder T6.6 Components:rear fill:
Cadence Q400 4 Channel Mains + rears
Thunder 801D Subs
MTX 1004 10's
Dual 4g wire to rear
4g grounds

Replies:

Posted By: kfr01
Date Posted: April 23, 2005 at 1:06 PM

Adire has a formula posted for determining if a sub is OK for downfiring use.

https://www.adireaudio.com/Files/TechPapers/DriverOrientation.pdf

There it is. :-)

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New Project: 2003 Pathfinder

Posted By: stevdart
Date Posted: April 23, 2005 at 1:15 PM

Here's a link to the calculator you can save in favorites: https://www.accelerator-pedal.com/sag.htm The calculator was designed using the Adire formula kfr01 referred to.

That driver has only a 1% sag factor which is excellent for downfiring use. Actually the lowest I've seen. 5% or below is acceptable. Since it sounds good to you too, it seems that you've got a perfectly good installation.

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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.

Posted By: kfr01
Date Posted: April 23, 2005 at 2:25 PM

Cool, great link stevdart. That's a definite bookmark.

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New Project: 2003 Pathfinder

Posted By: racer427
Date Posted: April 23, 2005 at 5:28 PM

Hey guy's,

Thnks to you both. Yeah, I am actually suprised as it is the cheaper line of MTX as well. Just put them in untill the New Brahama's come out. It will be another three weeks till we see those right?

And yes, that is a cool calculator, have it saved in my bookmarks.

And yeah, I was actually suprised as to how well they sound downfiring in the trunk. Every article that I have read regarding sub firing direction stated that downfiring in a trunk is bad. sh*t, sounds pretty damn good to me even if I have trunk open they still hit hard and clean inside the car.

Ok, well, on to the next project, Mid-Bass drivers and hand built crossovers.

Chris

Posted By: gladbach
Date Posted: April 23, 2005 at 8:03 PM

those mzs subs really aren't different than the thunder line, just a different brand for circuit city usage.

Posted By: racer427
Date Posted: April 23, 2005 at 8:06 PM

Well, CC carries both the MXS And the MZS line, The MxS subs are supposed to be better than the MZS subs.

Besides, they are only gonna be in for a short while, I am working on the new design for the trunk which will include and all in one Downfiring sub box plus amp racks. And from there I will decide if I am gonna go with the new Brahamas or aset of infinity's.

Chris