Induction Compensation 2-way Filter - 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 4th February 2004, 02:13 PM   #1
diyAudio Member
 
Join Date: Oct 2003
Location: The Lab
Default Induction Compensation 2-way Filter

The benefit of a serial filter for 2 way speakers is, that the phase is in sync thoughout the crossover region. In real life use, it means that the loudspeaker plays horizontally at all tones, not like a normal filter sometimes the sound is better at the floor, other tones sound better at the ceiling of your living room.

One drawback is the serial filter's self resonance point. Normally it causes a peak in the area 1200 Hz - 3500 Hz. Attempting to solve this problem, i have come up with this idea:

A rather simple filter, that works in a speacial way. It uses the bass unit as a serial resistor to feed the tweeter's terminals only limited in frequency by the rather small inductor.
Now the bass unit is a coil, so it has induction, and thus would on it's own not give a straght frequency in the treble region.
This is compensated with the RC filter of 1 uF and 8 Ohms, so the result is a near-perfect resistor. The values may vary slightly depending on the inductance of the voice coil of the bass unit.

The ICX filter is rather simple to build, and you don't need very expensive parts to get a good result. It sounds great actually.
There are NO frequency peaks. However the filter has shallow slopes, so the quality of the drivers is of some importance.

Enjoy! Lars Clausen
Attached Images
File Type: gif icxfilter.gif (9.7 KB, 157 views)
  Reply With Quote
Old 4th February 2004, 02:27 PM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
I'm sure its works OK but to be pedantic it is not a 2 way crossover.

The bass unit does not have a 1st order electrical rolloff.

So it cannot have the resonance of a 2 way series crossover.

Some way of adjusting tweeter level should be included.

And it does not allow for baffle step compensation,
which IMO severely limits its general practicality.

Here's a similar design, 2.5 way to give BSC, more at :

http://www.lcaudio.dk/com/dele.htm

One of the advantages of series 1st order crossovers is
that its self compensating for bass unit inductance see :

http://sound.westhost.com/parallel-series.htm#1.2

sreten.
Attached Images
File Type: gif 2.5wayseries.gif (16.4 KB, 147 views)
  Reply With Quote
Old 4th February 2004, 02:32 PM   #3
diyAudio Member
 
Join Date: Oct 2003
Location: The Lab
Thanks sreten.

I know that one, since i designed it a few years ago ;o)

Lars
  Reply With Quote
Old 4th February 2004, 06:33 PM   #4
Lionel is offline Lionel  France
diyAudio Member
 
Join Date: Jan 2004
Location: Saint Etienne
Hi Lars,
I'm really interested in your 2.5 way xover because I have nearly the same problem than the customer on LC audio site for a MTM configuration.
Do you know sites or DIY reports in which this type of crossover has been used.
It's look like a little bit "magic" to me and I haven't enough knowledge to understand it correctly.
But I think that it would a crime to not experience a such universal and simple solution.
Thank you for your comments.
  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
Preamp with Loudness compensation and Subsonic filter quicknick Solid State 7 7th April 2009 05:16 PM
Help with Induction heating for steam jacob.jacob0 Power Supplies 16 7th February 2008 06:35 PM
Induction planars APi Planars & Exotics 12 6th August 2007 05:53 PM
PS choke magnetic induction Klimon Tubes / Valves 3 9th April 2007 08:45 AM
Papst Induction Motor. Paul Dimaline Analogue Source 3 20th March 2006 09:24 PM


New To Site? Need Help?

All times are GMT. The time now is 12:18 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