question about non ported speakers - Home Theater Forum and Systems - HomeTheaterShack.com
Home Theater Shack Forums
XTZ Sound Marantz OPPO Digital - Universal Network 3D Blu-ray Players - Buy Direct from the Manufacturer Chane Music & Cinema Madisound Parts Express: Excellent Source for DIY Speaker and Subwoofer Projects! Musicians Friend: Your one stop shop for microphones, mic amps and Behringer products. Value Electronics: A trusted retailer and custom installer that specializes in whole-house audio, home theater, Plasma, LCD, LED, HDTVs, Blu-ray and more. Genelec: Active Speakers and Speaker Systems Audio General, Inc.: Great deals on projectors, screens and electronics. Underwood HiFi - Excellent discounts on some awesome name brands. Power Sound Audio designs, develops, and assembles high quality loudspeakers and subwoofers for home theater environments. Visual Apex: The most competitive pricing for home theater projectors... and built on customer satisfaction! SVSound Emotiva is your Home Theater Component Source for Audiophile Quality Home Theater Equipment at Factory Direct Prices Newegg: The perfect solution for all your HTPC and media server build needs! Creative Sound Solutions: Loudspeaker kits and components for subwoofers, midwoofers, woofers and full range speakers!

Like Us on facebookREW
Go Back   Home Theater Forum and Systems - HomeTheaterShack.com > Manufactured Speakers | Subwoofers > Home Audio Speakers
Forgot Password?
Donations Reviews Vendors

 Reply     Post New Thread
Views: 2392 - Replies: 9  
Thread Tools
Old 11-23-07, 12:29 PM   #1
Elite Shackster
Platinum Supporter

tonyvdb's Avatar
Tony
Since: Sep 2007
Posts: 12,969
Edmonton, Alberta, Canada
My System
  tonyvdb is offline    
I started this thread.
question about non ported speakers


What is the deal with some speakers not having any hole in them to allow for air to move in and out (ported) I have a set of Mission 762's and they have no hole in the cabinet. What effect does this have? Its my understanding that this tightens up the bass. How does the cabinet "breath", is this not hard on the drivers?


Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
EV Sentry 500 monitors, 4 Mission 762i's Surrounds, Klipsch RC-52 Centre, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE4000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900


Last edited by tonyvdb; 11-23-07 at 01:03 PM..

Forum Rules Reply With Quote
Sponsored Links
Advertisement
 
Old 11-23-07, 02:14 PM   #2
Senior Shackster

Josuah
Since: Apr 2006
Posts: 636
San Jose, CA
  Josuah is offline    
Re: question about non ported speakers


A port isn't used to allow a cabinet/speaker to "breathe" (except in one case I'll mention afterwards). The purpose of a port is to act as a Helmholtz resonator; in simple terms, the low frequencies of the speaker are produced by the movement of air through the port, rather than from the driver pushing air back and forth (although it is the driver movement that is causing the air in the port to move).

Sealed speakers do not have a port. Generally speaking, sealed speakers will not play as low because the low frequencies that would be produced by the port are not being produced anymore. The argument for tightening up the bass comes from the fact there can be either a delay in sound being produced by a port versus a driver or at high volumes distortion from the small port. But that is not a universal truth. Rear ported speakers can also sound boomy if they are placed close to the wall.

I have seen one or two speakers that have been designed with a tiny hole, not to act as a port, but to let air in and out. Usually, a sealed speaker is supposed to be sealed and you don't want any air to leak in or out. The compression of the air actually has an effect on the driver, of course. However, in these speakers, I guess they did not want that to be a factor for whatever reason.


Forum Rules Reply With Quote
Old 11-23-07, 03:00 PM   #3
Elite Shackster
Platinum Supporter

tonyvdb's Avatar
Tony
Since: Sep 2007
Posts: 12,969
Edmonton, Alberta, Canada
My System
  tonyvdb is offline    
I started this thread.
Re: question about non ported speakers


Thanks Josuah,
Thats kind of what I thought. Now just for curiosity, if I was to put a hole in the cabinet could this change the speakers sound for the bad? (don't worry I wont do this I'm just interested)


Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
EV Sentry 500 monitors, 4 Mission 762i's Surrounds, Klipsch RC-52 Centre, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE4000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900


Forum Rules Reply With Quote
Old 11-23-07, 05:42 PM   #4

avaserfi's Avatar
Andrew
Since: Jul 2007
Posts: 1,131
College Station, TX
  avaserfi is offline    
Re: question about non ported speakers


Just placing a hole in any given cabinet isn't a good idea. Various drivers can work in both a sealed and/or ported cabinet and you can use programs like WinISD to model how each driver would behave in a given situation, but one thing to note is not only does the size of the cabinet change, but if you are doing a ported cabinet one must take into account port size both diameter/width-height and length as ports are very rarely just a hole.

So if you just randomly put a hole in your cabs it would likely sound like bad as you would need to model the driver and build a new cabinet accordingly.


Forum Rules Reply With Quote
Old 11-23-07, 06:32 PM   #5
Senior Shackster

Josuah
Since: Apr 2006
Posts: 636
San Jose, CA
  Josuah is offline    
Re: question about non ported speakers


I'm assuming you mean a random hole, instead of a port. If the hole doesn't actually go all the way through the enclosure, it might not have much of an effect, especially if you end up creating the hole to stick in a mounting thing (I don't know what they're called, but the threaded thing you'd screw into) because then there's no loss of material.

However, if the hole goes all the way through then you're going to mess up the air pressure expected by the speaker designer, and at higher SPL it might make wheezy noises. A hole will also change the vibrational characteristics of the enclosure, maybe. Which is also a bad thing.


Forum Rules Reply With Quote
Old 11-23-07, 06:42 PM   #6
Elite Shackster
Platinum Supporter

tonyvdb's Avatar
Tony
Since: Sep 2007
Posts: 12,969
Edmonton, Alberta, Canada
My System
  tonyvdb is offline    
I started this thread.
Re: question about non ported speakers


LOL, Thanks guys, I was thinking of a real port with tube and all as the speakers that may be getting (floorstanders) for my living room system are also non ported and have a woofer located on the side of each cabinet. I just thought that was sort of strange but from what you are saying this is more common than I thought.


Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
EV Sentry 500 monitors, 4 Mission 762i's Surrounds, Klipsch RC-52 Centre, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE4000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900


Forum Rules Reply With Quote
Old 11-23-07, 09:46 PM   #7
Senior Shackster

ISLAND1000's Avatar
PHIL
Since: May 2007
Posts: 993
SHERMAN, TX
  ISLAND1000 is offline    
Re: question about non ported speakers


A hole in a sealed box is like a hole in a plate glass window. I say try it, "see" what happens.


Forum Rules Reply With Quote
Old 11-24-07, 12:42 PM   #8
Senior Shackster

Josuah
Since: Apr 2006
Posts: 636
San Jose, CA
  Josuah is offline    
Re: question about non ported speakers


Ports are a common design choice because it lets the specs say something like 40Hz-20kHz +/-3dB, instead of 100Hz-20kHz +/-3dB. So it's not that surprising you think it's weird for them to be missing. For myself, I've found that I don't use the ports on any of my ported speakers; my crossovers are set high enough to bypass them, for the most part. This is partially due to my specific set up, and partially because I know how ports model in WinISD.


Forum Rules Reply With Quote
Old 12-16-07, 01:34 PM   #9
Senior Shackster

warpdrive's Avatar
warpdrive
Since: May 2007
Posts: 200
  warpdrive is offline    
Re: question about non ported speakers


Quote:
tonyvdb wrote: View Post
Thanks Josuah,
Thats kind of what I thought. Now just for curiosity, if I was to put a hole in the cabinet could this change the speakers sound for the bad? (don't worry I wont do this I'm just interested)
No, you wouldn't want to do that. If a speaker is designed with no port, putting a hole will completely change the way it sounds. If you just need to mount the speaker, you can drill holes into the cabinet but it should still be sealed tightly.


Forum Rules Reply With Quote
Old 12-22-07, 02:25 PM   #10
Senior Shackster

conchyjoe7's Avatar
Konky
Since: Aug 2007
Posts: 228
Canton, GA USA
  conchyjoe7 is offline    
Re: question about non ported speakers


Most speakers with no ports are "acoustic suspension". They are excellent speakers with one drawback. In order to have great bass, because the cabinet is sealed it usually requires a much larger cabinet than ported speakers. They also tend to require more power...as the cabinet is "pressurized" so to speak... to reproduce the same SPL as a ported speaker. That said, IMO, and that of many others; the bass seems to be much tighter and deeper if done right. There are variations on this theme with excellent results being had by using "transmission line" loading which allows a smaller cabinet and employes long "tunnels" that fool the driver into thinking it is in a much larger box. Transmission line (true ones) speakers are few and far between today due mostly to the cost involved, but they're well worth seeking out and auditioning if one has the opportunity. A good example of a properly done transmission line is the old DCM Time Window 1A, which had remarkably tight and musical bass for the small woofer it employed. That speaker is still sought after by old timers like myself. You can occasionally find a good pair on eBay, but make sure the woofers have been refoamed as they were prone to foam disintegration.
Personally, I love a good acoustic suspension speaker...

Cheers,
Konky.


I get up...I get the paper...I read the obituaries...if I don't see my name; I go ahead and have breakfast! George Burns.

Forum Rules Reply With Quote
 Reply     Post New Thread     Back to Top of Page

Check out the Woot product for today!   Musicians Friend: Your one stop shop for microphones, mic amps and Behringer products.   Cmple   Monoprice Electronics   Amazon   Velodyne

Parts Express: Excellent Source for DIY Speaker and Subwoofer Projects!   Onkyo   GIK Acoustics: Home audio acoustics at its best... especially when you have help from the owners right here at the Shack!  Check out their very affordable acoustic panels!   Nyrius   Aperion Audio   Axiom Audio


« Home Theater Shack > Manufactured Speakers | Subwoofers > Home Audio Speakers »

« Previous Thread   Next Thread »

Bookmarks

Tags
ported, question, speakers
Thread Tools

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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off







Bookmark and Share


Parts Express: The #1 Internet source for all your DIY and electronics needs!

This site is best viewed with a screen resolution width of 1280 or higher!




Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©2006 - 2014, Home Theater Shack, LLC.



OUR SPONSORS


OUR AFFILIATES
Abe's of Maine

Adorama



Best Buy

Boston Acoustics A Series Speakers

Cables.com

Circuit City

Denon

DIRECTV

e-Cost

emusic.com

Fluance

GameFly

GamersGate

Harman

Headphone Authority

HDtracks

iTunes

J&R

Logitech

MarvelStore

MCM Electronics

Musician's Friend

Monoprice

Newegg

OneCall

Overstock

Panasonic

Parts Express

Paul's TV

Roku

SMS Audio

Solid Signal

Sonos

Sony

SquareTrade Warranties

Super Media Store!

Vann's

Velodyne

vudu

Warner Bros

Winegard

Woot

World Wide Stereo

ZVOX

Zzounds




Search Engine Friendly URLs by vBSEO