Mixing slope types? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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
Reply
 
Thread Tools Search this Thread
Old 13th July 2012, 07:58 PM   #1
diyAudio Member
 
nonsuchpro's Avatar
 
Join Date: Sep 2011
Location: Bowie, MD
Thumbs up Mixing slope types?

Hey all,
What are the advantages/disadvantages of mixing slope types? I can do this on my Ashly electronic crossover but really am wondering if it is done with passive crossovers much. For instance... use a Linkwitz-Riely slope on the woofer and then a Butterworth on the tweeter

1800hz
Linkwitz-Riely
C2 = 5.53 uF
L2 = 1.41 mH

1800hz
Butterworth
C1 = 7.81 uF
L1 = 1 mH

Thanks in advance!
__________________
My Studio
  Reply With Quote
Old 15th July 2012, 12:45 AM   #2
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
Often a driver has an acoustic roll-off near the cross-over frequency. That roll-off counts as part of the slope.
__________________
Kevin
  Reply With Quote
Old 15th July 2012, 12:59 AM   #3
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Well as speedskater says the drivers own frequency response contributes significantly to the final acoustic result.

When discussing xover types one usually is talking about the acoustic response, that is the drivers own natural response + what the electrical filter adds to it.

In terms of loudspeaker design what the electrical filters are doing is rather academic, it is the final acoustic result that we are interested in. Say for example a 4th order Linkwitz Riley (Q = 0.5) target at 2Khz, this might actually require a second order electrical filter with a Q of 0.3 at 2.2kHz. The filter isn't interesting, the result is what is.

Now of course the filter is interesting if it doing something that you'd rather it shouldn't, like lowering the input impedance too low, or, in the case of active filters, creating areas of very high gain that could cause your amplifiers to clip and your drivers to explode.

Now with regards to combining different acoustic targets, this happens a lot where you will see a designer using asymmetrical slopes. This is generally done to ensure that the drivers of a system sum correctly with respect to their phase alignment.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 22nd July 2012, 03:16 PM   #4
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
What 5th said. As usual.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mixing Resistor types? Bloodcore Tubes / Valves 4 28th June 2011 10:43 AM
mixing coupling cap types PRNDL Tubes / Valves 1 24th December 2007 02:48 AM
Mixing two types of sub boxes? Bogie Subwoofers 0 24th April 2006 02:33 AM
Crossover slope? Mantronic Multi-Way 0 30th July 2003 01:47 PM


New To Site? Need Help?

All times are GMT. The time now is 12:15 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2