rear horn mouth area
 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
 15th August 2005, 06:41 PM #1 big_kahunah   diyAudio Member   Join Date: Aug 2005 rear horn mouth area I am currently building a pair of rear horns for some 3.5" speakers i have based on Marting King's mathcad worksheets. My design has a length of 120", throat area of 2.25 in^2 and a mouth area of ~144 in^2. the predicted response is fairly smooth to 50hz. however, i've been reading some other information online and a few sources state that the required mouth area is related to wavelength of the expected cutoff frequency. so is the mathcad model wrong or is the required area just a suggestion? I didn't see anything about this in the papers on horn design that King created.
 16th August 2005, 01:35 AM #2 MJK   Account disabled at member's request   Join Date: Feb 2002 Location: Clifton Park, NY I think what you have designed is a TL that transitions to horn-like behavior. The horn cut-off frequency is determined by the mouth size and your 144 in^2 is small so the horn cut-off frequency is high. Below this point I think you will have TL behavior, if you look at the acoustic impedance plot in the MathCad worksheets you will see a series of peaks at low frequencies. Then at some point the coupling volume will roll off the "mouth's" output as the line becomes more like a horn, look at the open end SPL response plot to see if this occurs. Nothing wrong with this approach, I think most BLH designs on the Internet do exactly the same thing. My write up on advance BLH design is attempting to show this compromised design. I am updating, cleaning up some typos/explanations and improving the baffle step part of the calculation, and will post a new version this document later in the week.

 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 bubblersound Subwoofers 2 7th June 2009 05:57 PM Tyimo Full Range 8 22nd February 2008 06:53 PM Puggie Full Range 7 26th July 2006 12:08 PM mefistofelez Multi-Way 11 14th October 2005 01:04 AM Stocker Multi-Way 7 9th March 2005 09:39 AM

 New To Site? Need Help?

All times are GMT. The time now is 11:30 AM.