Port question, round vs rectangular
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 7th February 2008, 06:13 PM #1 kvk   diyAudio Member   Join Date: Jan 2008 Port question, round vs rectangular I promise I'm almost done with my noob questions. If a port is spec in a raound, dia x len, is there a conversion to rectangular? Intuitively, I'd guess to keep area and length the same but my guess is that you might need also change area a tad, maybe like up it a few %. I found this cool calculater but it only does round ports, not slot-- http://www.mhsoft.nl/Helmholtzabsorber.asp
vinylkid58
diyAudio Member

Join Date: May 2005
Location: Victoria, B.C.
Re: Port question, round vs rectangular

Quote:
 Originally posted by kvk If a port is spec in a raound, dia x len, is there a conversion to rectangular? Intuitively, I'd guess to keep area and length the same but my guess is that you might need also change area a tad, maybe like up it a few %.
You're on the right track, so to speak. Just compare area to area, all you need to know is the diameter of the port to calculate it's area. Just keep the length the same for either.

Jeff

 8th February 2008, 01:08 AM #3 kvk   diyAudio Member   Join Date: Jan 2008 Alright, let's muddy the water. Keep the area the same put flares on the ends of the port. Do you measure the length the beginnings or ends of the flares or somewhere in between? My guess would be about 1/2 in between the beginning and end of the flares but that's just intuition. I'm the noob here.
vinylkid58
diyAudio Member

Join Date: May 2005
Location: Victoria, B.C.
Quote:
 Originally posted by kvk My guess would be about 1/2 in between the beginning and end of the flares but that's just intuition. I'm the noob here.
I can't give you a definitive answer, but there is an "end correction" function which deals with this issue when modeling boxes. Obviously, the correction factor will grow as the port gets larger, but I don't know how to calculate an exact number.

What you suggest makes sense, as long as you are dealing with only one (1) vent.

Jeff

 8th February 2008, 03:22 AM #5 soongsc   diyAudio Member     Join Date: Mar 2005 Location: Taiwan __________________ Hear the real thing!
 8th February 2008, 07:19 AM #6 cabbagerat   diyAudio Member   Join Date: Jan 2004 Location: Cape Town Try WinISD Pro. It supports simulation of both round and rectangular ports. The help file also has a lot of interesting info about ports, end correction, and other topics.
 11th February 2008, 08:16 AM #7 Commsandsound   diyAudio Member   Join Date: Feb 2008 Port length Hi Dont forget to check the port length unless it is just a hole. regards www.commsandsound.com

 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 Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Aussie Amplifiers         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post MaVo Multi-Way 21 21st August 2013 01:37 PM cabbagerat Full Range 7 14th February 2008 10:03 AM philippe_95 Multi-Way 13 3rd March 2007 06:48 PM sunil Multi-Way 3 5th February 2005 08:58 PM Jimmy154 Multi-Way 8 30th June 2002 08:37 PM

 New To Site? Need Help?

All times are GMT. The time now is 02:05 PM.