Passive Radiators: The Basics - Car Audio Classifieds!
Car Audio Classifieds!  

Go Back   Car Audio Classifieds! > Car Audio Help & Discussion > Tutorials & Quick References

Tutorials & Quick References This section is for how-to's and quick references for car audio.


Notices

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-28-2009, 08:22 PM
No, I'm not dead
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss8128
Location: Somewhere in time
Thanks: 0
Thanked 9 Times in 8 Posts
iTrader: (19)
Feedback Score: 19 reviews
Default Passive Radiators: The Basics

After Dave's thread about passives it struck me that there might be a need to cover some of the basics on passives.

I have seen some talk about passives being merely a rip-off as it fools consumers into believing that they're getting more woofers than they really are. That's far from the truth, if you used two subs in the same size enclosure that the driver and passive are in you'd get a huge decrease in the lower register. The passive serves the same purpose as a port but offers more flexibility than most conventional ports.

First: Enclosure size. Sure you can go with a T-line and have the sub mounted at one end of a tube so that you only have the displacement of the port in the footprint. Unfortunately they're very tricky to calculate and aren't forgiving of different drivers in the same enclosure. It could work or not. A PR box only needs to be the size that accommodates the sub and the passive. That enclosure will work fine for any sub you can fit in the hole provided that the passive meets it's needs. If you're using a tunable passive it will increase what it'll work well with.

Second: Port noise. If your port's too small and it makes noise you're pretty much up a stump. If the passive isn't up to the task you can replace it with one that suits your needs. If the passive is making noise it's because it's moving too far. One with longer excursion will solve that dilemma.

Third: Tunability. You can easily lower the FS of the passive by adding mass to it. This in turn lowers the tuning of the enclosure. This can be accomplished by gluing weights to it or going with a step larger passive than the sub or adding another passive. While larger and more won't work well in an eastablished enclosure, added mass is fairly easy. Many passive radiators even offer a mount for more mass.

Passive radiators are fun to play with. You can tune and listen, tune and listen and keep at it with tiny change until you get it where you want. If you decide later that it needs a change it's not a big deal to go back a few steps if you use a tunable passive. Glued weights are a different story though.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Car Audio Classifieds! forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live
Level of Car Audio Knowledge
What's your level of car audio?

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Spl (150+) with passive radiators? Dbmonster General Car Audio Discussion & Questions 7 06-16-2010 02:12 AM
Anyone interested in Passive Radiators?! TeamPSI (PSI Car Audio) 253 05-23-2010 01:16 PM
[MODERATE] Passive Radiators danteBirosel Tutorials & Quick References 0 11-12-2008 03:10 PM
Basics of wiring speakers forceww Tutorials & Quick References 3 09-30-2008 09:28 AM

» Amps
A/d/s/
Advent
Alphasonik
Alpine
American Bass
ARC Audio
Atomic
Audio Art
Audio Gods
Audiobahn
Audiocontrol
Audiopipe
Audison
Aura
Autotek
Avionixx
Bazooka
Beyma
Blaupunkt
Boss
Boston Acoustics
Bravox
Cadence
Cascade (CAE)
CDT Audio
Cerwin Vega
Clarion
Clif Designs
Concept
Coustic
Critical Mass
Crossfire
Crunch
DB Drive
DC Audio
DC Power
DEI
Denon
Diabolo
Diamond
Digital Designs
Directed
DLS
Dual
DYnamat
Dynaudio
Earthquake
Eclipse
Elemental Designs
ESX
Eton
Farenheit
Fi Car Audio
Fix My Speaker
Focal
Fusion
Genesis
Ground Zero
Hafler
Helix
Hertz
Hifonics
Hushmat
Image Dynamics
Infinity
Interfire
JBL
Jensen
JL Audio
JVC
Kenwood
Kicker
Knu Konceptz
Kole Audio
Kove Audio
Lanzar
Lightning Audio
Linear Power
MA Audio
Magnat
Marantz
Massive Audio
MB Quart
McIntosh
Memphis
Metra
MMATS
Mobile Authority
Morel
MTX
Nakamichi
Niche Audio
O2 Audio
Ohio Generator
Optima
Orion
Oxygen Audio
OZ Audio
PG Audio
Phase Linear
Phoenix Gold
Pioneer
Polk
Power Acoustik
Powerbass
Powermaster
Precision Power
Profile
Pyle
Pyramid
RadioShack
Rainbow
Rampage
RE AUdio
Rockford Fosgate
Scanspeak
Scosche
Seas
Sony
soundstream
Sparkomatic
SPL Dynamics
Stinger
Sundown Audio
Swiss Audio
Targa
TC Sounds
TREO Engineering
TRU
Tsunami
Ultimate
US Acoustics
US Amps
Velodyne
Vifa
Viper
Visonik
Xtant
Zapco
Zed Audio
Powered by vBadvanced CMPS v3.2.3
Links
Amp Guts
amplifier, amp guts, ampguts, car audio classifieds, speakers and subs for sale with listings of 12 volt sound systems. Security systems for sale for aftermarket car audio equipment with amplifier and amps for sale
Car Audio Forum
car audio forum, moble audio, car stereo, wholesale car audio, 12 volt, with, amplifier, amp, subwoofer, sound quality, buy car audio, and sell automotive stereo systems for cars
Car Audio Sound Quality Forum
Sound QUality science based car audio forum, amplifier, subs and speaker design, fabrication help, sound systems forum, aftermarket car audio website for sound quality.
Car Stereo Forum
DIYMA car audio stereo forum for 12 volt car audio subwoofer and amplifier systems that have sound quality with wholesale car audio products.


All times are GMT -5. The time now is 07:08 PM.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.