Combining active and passive crossovers - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

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
Reply
 
Thread Tools Search this Thread
Old 26th January 2013, 07:52 PM   #1
hates ground loops
diyAudio Member
 
Rodeodave's Avatar
 
Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
Default Combining active and passive crossovers

As you can see in my other thread Questions regarding electronic crossovers, bi-amping and impedance equalization, I have built me a nice pair of 2-way TQWT floorstanders.
I am currently using a 2nd order PLLXO as per TLS.org | Passive Line-Level Crossover to separate high and low frequencies with consequent bi-amping. The design really calls for a 3rd order crossover, but that's hard to implement as a PLLXO.

Now my question is the following: Will adding a 1st order passive crossover at the speakers, combined with the 2nd order PLLXO, convolute to a 3rd order characteristic in total?

The woofer is the TangBand (TB) W6-623I (R_e=6.11R) and the tweeter is the TB 28-847SE (R_e=6R).
Would a 0.39mH inductance for the woofer and a 7.5uF cap do the trick if the crossover frequencies are 2.5kHz and 3.5kHz respectively (spread frequency crossover)? Should I be using a impedance compensation network for the woofer?
__________________
Gravity - Making the G since 13.7 billion B.C.

Last edited by Rodeodave; 26th January 2013 at 07:54 PM.
  Reply With Quote
Old 26th January 2013, 08:09 PM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

Yes you can get to a third order function (eventual 3rd order roll-off)
but your very limited to very overdamped with cascaded 1st order.

The speaker design is poor as it has no BSC (baffle step compensation),
and BSC is the easiest thing to do at passive line level of all the options.

With equal sensitivity drivers and a typical decent 2 way the best
option for amplication is about 4 to 1, for chip amps a normal
amplifier for treble and bridged parallel for bassmid, one supply.

rgds, sreten.

http://sites.google.com/site/undefinition/diy
(see if nothing else, the excellent FAQs)
The Speaker Building Bible
Zaph|Audio
Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter
FRD Consortium tools guide
http://web.archive.org/web/200909021...esigningXO.htm
RJB Audio Projects
http://web.archive.org/web/200909022...ve99/Spkrbldg/
Speaker Design Works
http://www.htguide.com/forum/showthread.php4?t=28655
A Speaker project
DIY Loudspeakers
Humble Homemade Hifi
Quarter Wavelength Loudspeaker Design
Pi Speakers - unmatched quality and state-of-the-art performance
The Frugal-Horns Site -- High Performance, Low Cost DIY Horn Designs
6.283 Audio Pages
Linkwitz Lab - Loudspeaker Design
Music and Design

Great free SPICE Emulator : SPICE-Based Analog Simulation Program - TINA-TI - TI Software Folder
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 26th January 2013 at 08:18 PM.
  Reply With Quote
Old 26th January 2013, 08:18 PM   #3
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Wouldn't it be better to go to an active line-level crossover circuit?
  Reply With Quote
Old 26th January 2013, 08:21 PM   #4
hates ground loops
diyAudio Member
 
Rodeodave's Avatar
 
Join Date: Dec 2004
Location: in the alps
Blog Entries: 1
Quote:
Originally Posted by gootee View Post
Wouldn't it be better to go to an active line-level crossover circuit?
Eventually, yes. But until I get around to building the active circuitry, the addition of an inductance and using a smaller cap could be a temporary solution.
__________________
Gravity - Making the G since 13.7 billion B.C.
  Reply With Quote
Old 26th January 2013, 09:08 PM   #5
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Quote:
Originally Posted by gootee View Post
Wouldn't it be better to go to an active line-level crossover circuit?
No excuse. Spend $50 on e-bay for a used Behringer or DBX. It is FAR better than what the passive crossover is doing to the input of the amp. Then when you save up, build a really nice active one.
  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
What do you think of passive crossovers? Boscoe Multi-Way 259 22nd August 2013 05:12 PM
xm46 passive crossovers vinylnvalves Multi-Way 30 4th September 2012 11:25 AM
passive crossovers.... stuman Subwoofers 10 8th December 2009 02:44 AM
Anybody out there replacing high-end speaker's passive crossovers with active ones? wigginjs Multi-Way 13 13th May 2005 01:55 PM
dB loss by using passive crossovers? Active vs Passive and 1st vs 4th order Hybrid fourdoor Multi-Way 3 11th July 2004 09:16 PM


New To Site? Need Help?

All times are GMT. The time now is 06:13 AM.


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