Keele, D. (2004) "Maximum efficiency of compression drivers"
 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

 Multi-Way Conventional loudspeakers with crossovers

 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
 25th October 2007, 12:31 PM #1 svenr   diyAudio Member   Join Date: Oct 2007 Keele, D. (2004) "Maximum efficiency of compression drivers" Hi folks, Don Keele's probably well known article examines the relationship between driver parameters, nominal and true efficiency for compression driver design. It can be found here: http://www.xlrtechs.com/dbkeele.com/PDF/Keele%20(2004-10%20AES%20Preprint)%20-%20Maximum%20Efficiency%20of%20Compression%20Drive rs.pdf It's interesting to observe that Keele stops his talk when it comes to the interesting parts. When looking at section 6.4.2 equation (40) of the paper, Keele derives the nominal efficiency of a compression driver loaded by an infinite tube while neglecting the influence of voice coil inductance and front chamber compliance. Equation (40) is than simplified by introducing normalization variables and given as equation (41). When calculating both equations from the same set of given variables I get (surely caused by my math incapability) differing results. Equation (40) involves 5 independent parameters (R1, R2, R3, L2 and C2) as well as the variable w. But the simplified equation (41) shows only 3 independent and 1 interdependent parameter (plus the normalized variable wn). Equation (40) is strongly influenced by inductance L2 representing system compliance, while equation (41) is not influenced by normalization variable wo representing L2. I've prepared a little spreadsheet (with most of the equations probably transcribed incorrectly): www.geocities.com/srechenberger I would appreciate if you could help me out with this; I'm kind of confused... Greetz Sven
 25th October 2007, 04:33 PM #2 GM   diyAudio Member     Join Date: Jun 2003 Location: Chamblee, Ga. Greets! Wish I could, but my higher math skills are mostly non-existant, so about all I can help with is a valid link: http://www.xlrtechs.com/dbkeele.com/...%20Drivers.pdf GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
 28th October 2007, 04:14 AM #3 svenr   diyAudio Member   Join Date: Oct 2007 Hi folks, anybody must be able to give me a hint where the problem is within the transformation... Cheers
 28th October 2007, 03:03 PM #4 GM   diyAudio Member     Join Date: Jun 2003 Location: Chamblee, Ga. Greets! There are, but very few of us on this forum have any interest in compression horns, so try these instead: http://audioheritage.csdco.com/vbulletin/ http://www.audioasylum.com/forums/hug/bbs.html http://www.audioroundtable.com/HighEfficiencySpeakers/ GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

 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 usa_satriani Multi-Way 138 25th October 2013 07:44 PM 454Casull Multi-Way 24 9th August 2009 05:19 PM Magnetar Swap Meet 0 19th November 2006 03:42 AM imix500 Multi-Way 12 6th July 2005 07:01 PM

 New To Site? Need Help?

All times are GMT. The time now is 03:39 AM.

 Home - Contact Us - Advertise - Rules - diyAudio Store - Sponsors - Privacy Statement - Terms of Service - Top - Opt-out policy

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.