Bass drivers which cleanly roll-off without a low pass 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 10th February 2011, 10:25 AM   #1
diyAudio Member
 
theophile's Avatar
 
Join Date: Sep 2006
Location: Sunshine Coast Queensland Australia
Default Bass drivers which cleanly roll-off without a low pass filter.

As a life long music-lover and hi-fi user for over 30 years one of the paths to refining the amp/speaker interface - the elimination of the passive network which interposes between the amp and the driver - has been a touchstone for me.I have used an active crossover with absolutely no amp/speaker interposing crossover for the past 8 or so years.

I have in the past used a small speaker(the original AR 18)which used an 8 inch paper cone driver that had absolutely no low-pass crossover element.In fact the 8 inch driver got the entire frequenct spectrum via the rear terminals.The only crossover element was one capacitor for the tweeter at 2KHz.

I philosophically like the idea of an arrangement which obliviates the need for an electronic filter by virtue of the natural characteristics of the driver(caused by materials,design or any other means).

Are there such beasts?

I know this is very open-ended,not the least because I haven't laid-out any particular roll-off frequency I'd like to commence from,what efficiency I'd like to the utilising,minimum or maximum cabinet sizes that I would consider,how much I'm prepared to spend (etc).If I were to be specific I'd be looking for a driver having 500Hz roll-off equiv to 12dB per octave with efficency of 98 dB/W/M.

Is there anything out there which has characteristics such as those?
  Reply With Quote
Old 10th February 2011, 10:31 AM   #2
CLS is offline CLS  Taiwan
diyAudio Member
 
Join Date: Jun 2005
Location: Taiwan
4th order band pass?
  Reply With Quote
Old 10th February 2011, 11:03 AM   #3
diyAudio Member
 
theophile's Avatar
 
Join Date: Sep 2006
Location: Sunshine Coast Queensland Australia
Quote:
Originally Posted by CLS View Post
4th order band pass?
Mate It's sometimes around the 14th order of drinks that I'd start hoping the band will pass on doing another set.
  Reply With Quote
Old 10th February 2011, 11:10 AM   #4
Helmuth is offline Helmuth  Netherlands
diyAudio Member
 
Helmuth's Avatar
 
Join Date: Oct 2008
Location: Winterswijk
Quote:
Originally Posted by theophile View Post

Are there such beasts?

I know this is very open-ended,not the least because I haven't laid-out any particular roll-off frequency I'd like to commence from,what efficiency I'd like to the utilising,minimum or maximum cabinet sizes that I would consider,how much I'm prepared to spend (etc).If I were to be specific I'd be looking for a driver having 500Hz roll-off equiv to 12dB per octave with efficency of 98 dB/W/M.

Is there anything out there which has characteristics such as those?
May be a voice coil of 2,6mH without copper ring in motor assembly can cause such roll off far i can see they all done their best to get extended midrange.

You shout make a front loaded horn like this.
Back Loaded Horns
__________________
( (( KUGELWELLE )) )
recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

Last edited by Helmuth; 10th February 2011 at 11:19 AM.
  Reply With Quote
Old 10th February 2011, 11:50 AM   #5
jwmbro is offline jwmbro  United States
diyAudio Member
 
jwmbro's Avatar
 
Join Date: Nov 2007
Location: München, Bavaria, Germany
I agree with Helmut. A front-loaded horn functions as a natural accoustical lowpass.
__________________
Regards, James
  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
Inductor hi pass to filter low bass dcathro Multi-Way 12 6th September 2010 10:36 PM
DIY One fader mixer with Filter Low Pass, Hi Pass, Notch Pass Filter PGM stevep314 Analog Line Level 0 10th August 2010 10:15 PM
Does Pass D1 roll off treble at low volumes? kiwi_abroad Pass Labs 1 17th September 2006 11:53 AM
Opamp low-pass roll-off question ppereira Solid State 46 6th December 2002 04:44 PM


New To Site? Need Help?

All times are GMT. The time now is 07:48 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