E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > Bavarian Soundwerks' Mobile Electronics Forum

Bavarian Soundwerks' Mobile Electronics Forum
Have all your A/V and electronics questions answered here. Ipods, A/V, Radar Detectors Oh My!
Sponsored by Bavarian Soundwerks

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-23-2004, 04:15 PM   #1
rdsesq
ouroboros autorotica
 
rdsesq's Avatar
 
Join Date: Apr 2003
Location: Cali...the only state that matters
Posts: 1,452
My Ride: 2002 330i
A (probably) stupid sub mounting question...

So I see a lot of info on box specs for Subs, sealed and ported. However, I also see plenty of installs in mags of subs installed without boxes, (like face down in a fiberglass center console, like in the latest Alpine mini or Audiobahn "demo" cars) So what happens if you install a sub in openspace in your trunk?

As an example, I build a metal frame to mount the sub, but it is just that, a frame. and mount it in the trunk, what will happen to the sound quality, and why?

rob
__________________
"The existence of life is a highly overrated phenomenon."
-- Dr Manhattan

quis custodiet ipsos custodes
rdsesq is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 04-23-2004, 05:55 PM   #2
bigjae1976
Registered User
 
bigjae1976's Avatar
 
Join Date: Dec 2003
Location: Earth
Posts: 11,407
My Ride: A car
Send a message via MSN to bigjae1976
Nope not stupid. I don't know the whole answer but part of it is that the sub depends on pressure to damp or control the movement of the sub. Otherwise it will self-destruct. That's why a sealed box can handle more power than a ported box because the internal pressure creates an opposing force. That's also why sealed boxes aren't as efficient as a ported box.
bigjae1976 is offline   Reply With Quote
Old 04-23-2004, 06:13 PM   #3
breyton3er
Registered User
 
Join Date: Aug 2002
Location: jersey
Posts: 414
My Ride: 04 M3
Send a message via AIM to breyton3er
I'm not positive but I think when they do a down firing sub there is still a sealed box its just the box is in front of the sub instead of behind it. Ported boxes have a tendency to have more of a boomy type sound. They aren't as tight as a sealed box but def louder. I think we need a professional on this topic.
__________________

MECP Silver
Cedia Level I
breyton3er is offline   Reply With Quote
Old 04-23-2004, 07:07 PM   #4
mnbmw
Registered User
 
Join Date: Mar 2004
Location: Minnesota
Posts: 14
My Ride: 2001 330CI
Each sub will have an optimum mounting type, free-air (what you asked about), sealed or ported. Typically ported is louder, more efficient but is not as tight of sound. Sealed usually provides the tightest sound. Free air has the most flexible install but usually sounds the most muffled. I personally hate free air and really like tight sealed enclosure subs. Every sub should state the optimum install options. For example size of box, size and lenght of port. The most important thing is to match the enclosure and the sub. There are many subs that don't perform well in free air installs and there are a wide variety of similar size subs that have very different enclosure sizes.
mnbmw is offline   Reply With Quote
Old 04-24-2004, 09:44 PM   #5
djabaley
does anyone read my p0sts?
 
Join Date: May 2002
Location: Florida
Posts: 595
My Ride: 325 slushbox
breyton3er is the only one on track here

The subs still face into a sealed enclosure of the appropriate dimensions. Most serious subs cannot be run w/ any significant power in a free-air situation because, in a sealed box for example, the air pressure involved w/ a sealed box helps to keep the sub physically intact.
__________________
djabaley is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 05:35 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use