Active xover delay stages
 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
 21st February 2004, 11:21 AM #1 5th element   diyAudio Member     Join Date: Oct 2002 Location: England Active xover delay stages I know that there are specific delay stages you can build to time align drivers on a flat baffle, but do normal filter stages delay the signal at all? I remember reading somewhere thay they do, which makes sense, but by how much? Is there a time that all circuits ie with one opamp, do delay the signal by or is it circuit dependant? Also if it is circuit dependant how do you calculate this time delay. Would a simulation program model this accurately? For example build the circuit and then send a sine wave in at one end and measure the output wave incomparison to the input and thus calculate the time delay. Cheers Matt. __________________ What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Now with website! www.5een.co.uk under construction.
 21st February 2004, 11:40 AM #2 5th element   diyAudio Member     Join Date: Oct 2002 Location: England Well simulating does indeed seem to work. I have found out that the +-6db level on linkwitz site has 180 degree phase reversal at any frequency. __________________ What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Now with website! www.5een.co.uk under construction.
 21st February 2004, 11:45 AM #3 sreten   R.I.P.   Join Date: Nov 2003 Location: Brighton UK You multiply the phase angle by the wavelength to get the delay, or lead (for low pass ?). Bessel filters have the property that the phase angle changes at such a rate as to be equivalent to a constant offset of the driver. The higher order the filter, the more the offset. So called linear phase which equates to a fixed time delay. Other types of filters set assymetrically can compensate for the offset of two drivers at the crossover point, but they are not maximally flat delay like the Bessel. some info here : http://www.rane.com/note147.html though it deals with group delay, not pure delay. sreten.
 21st February 2004, 12:32 PM #4 markp   diyAudio Member   Join Date: Oct 2003 Location: L.A., CA Check out a filter design handbook(not just a crossover book) to find the delay characteristics of each type of filter. Every type of filter has a different set of characteristics like Butterworth is max flat amplitude and Bessel is max flat delay but the trade off is the Bessel is not as steep per order as a Butterworth and rings slightly. There are many more factors involved but a book will outline them all for you. __________________ If it sounds good... it is good!

 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         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 dallaire Multi-Way 28 18th April 2011 12:23 PM MarkHathaway Swap Meet 0 21st September 2008 09:31 AM georgehifi Solid State 11 11th October 2006 11:26 PM georgehifi Digital Line Level 3 15th August 2006 07:46 AM mrfeedback Analogue Source 29 20th September 2002 10:17 PM

 New To Site? Need Help?

All times are GMT. The time now is 04:14 AM.