Crossover frequency selection for line array
 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
 13th June 2009, 10:15 AM #1 goldyrathore   Account disabled at member's request   Join Date: Nov 2002 Crossover frequency selection for line array In an array where the mids form a line and a single woofer is placed below it like http://www.parts-express.com/project...oject=Colossi, how does one choose the woofer to mid crossover frequency (ie choose the highest possible crossover frequency, assuming a good overlap in mid and woofer driver responses)? In case of two drivers side by side, the ctc determines the crossover, however, in the line array case how does one calculate the ctc between the line of mids and the woofer below the line ?
 13th June 2009, 12:15 PM #2 goldyrathore   Account disabled at member's request   Join Date: Nov 2002 Corrected the link
 13th June 2009, 03:30 PM #3 Ferrit37   diyAudio Member     Join Date: Apr 2007 Hey Goldyrathore, to determine the crossover points between components you need the step distance (ctc) between components to equal a half wavelength of your operating frequency. the formula L = C/F gives you the wavelength of the frequency and you need to divide this by 2 (C = speed of sound) You need to make sure that all of the midrange components are included, you don't want the top of the array outside the step distance. So given the design cited it appears that the top midrange is about 59.25" from the center of the woofer putting the values of C=13340" into the formula it would seem that 113Hz would have a half wavelength of 59.46". The value of C changes for Temp/altitude/Humidity so you should enter one for your local. Check out Christian Heil's paper on the L'acoustics page. Hope this helps __________________ Warmest regards, Ferrit37
 13th June 2009, 04:30 PM #4 tinitus   diyAudio Moderator R.I.P.   Join Date: Nov 2005 I agree Due to array mids, the woofers should be crossed very low I dont know the mid drivers, but 6" ought to be capeable of "running loose" with no highpass xo With that many mid drivers there should be no problems with Xmax Where to cross woofers would then depend on mids natural rolloff, which could be anywhere from 50-100hz Some plateamps or standalone filter will have active highpass as well, and would be more flexible __________________ sometimes we know very little, and sometimes we know too much
 13th June 2009, 06:31 PM #5 goldyrathore   Account disabled at member's request   Join Date: Nov 2002 Does the same rule apply to line source too? Isn't the crossover of Vista , from MartinLogan (http://www.in.martinlogan.com/specs/vista.html) too high if the same rule is used? I am assuming the same rule applies for line source too. Vista is crossed at 450Hz 'ween the woofer and the panel.
 13th June 2009, 08:28 PM #6 Ferrit37   diyAudio Member     Join Date: Apr 2007 Well I'm not that familiar wth the "Maggies" but it might be a case of the HF panel not going low enough. Not having the X-over point at the stipulated frequency affects the vertical polar response. __________________ Warmest regards, Ferrit37

 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         Holton Precision Audio         CSS         Dx Classic Amplifiers         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 woodrowman Full Range 9 12th October 2016 04:14 PM saramac Multi-Way 5 24th February 2007 09:11 PM thadman Planars & Exotics 17 20th January 2007 08:42 AM PrimaLuna Full Range 7 19th February 2006 03:50 AM onis_uk Multi-Way 8 4th August 2004 08:05 AM

 New To Site? Need Help?

All times are GMT. The time now is 04:48 PM.