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 13th November 2012, 05:55 AM   #21
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Well, it's in the same era as the JBL small BLHs and its folding is conceptually the same, so don't be surprised if it has a similar response to it and the K15 [red trace].

GM
Attached Images
File Type: jpeg 2226 in C40.jpeg (143.1 KB, 68 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 13th November 2012, 06:04 AM   #22
DeonC is offline DeonC  South Africa
diyAudio Member
 
DeonC's Avatar
 
Join Date: May 2002
Location: Kimberley, South-Africa
Ouch! That looks like a big peak around 100Hz, and very little below 60Hz. It'll probably sound impressive on rock, but not so good on classical (and I listen to both). Methinks I'll stay with the Berkeley boxes, and see what tweaks I can do to them. Thanks for your time and patience, and all the invaluable information. Very much appreciated.

Deon
__________________
I don't suffer from insanity. I enjoy every minute of it.
Have a look at my favorite thread: Interesting YouTube video clips
  Reply With Quote
Old 13th November 2012, 06:07 AM   #23
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Yep, they didn't call them 'kick' bins for nothing.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 13th November 2012, 06:16 AM   #24
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Really nothing you can do with a reflex except tune it higher or lower.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 13th November 2012, 08:19 AM   #25
DeonC is offline DeonC  South Africa
diyAudio Member
 
DeonC's Avatar
 
Join Date: May 2002
Location: Kimberley, South-Africa
Quote:
Originally Posted by GM View Post
Really nothing you can do with a reflex except tune it higher or lower.

GM
That, and I'd like to see what the effect of a Karlson cut in the port will have. Luckily the standard port is rectangular, so that will make experimentation easier. What will the effect of 1/4, 1/3, 1/2 and 2/3 length cuts be? As far as I understand, as the length of the cut gets longer, the broader the resonant peak will be. How will that affect the sound? What about broader and slimmer cuts? I will have to try and then find out, won't I?

Enjoy,
Deon
__________________
I don't suffer from insanity. I enjoy every minute of it.
Have a look at my favorite thread: Interesting YouTube video clips
  Reply With Quote
Old 13th November 2012, 02:02 PM   #26
DeonC is offline DeonC  South Africa
diyAudio Member
 
DeonC's Avatar
 
Join Date: May 2002
Location: Kimberley, South-Africa
GM, have a look at the following page:

The measurements on Laurent's hornloaded cabinets

It is a page of someone who built a slightly modified rectangular GRF. According to his measurements, he is close to flat down to 50Hz, and -3dB at 25Hz. What do you think?

Deon

System response w/o horn response:
Click the image to open in full size.

Response measured at horn mouth:
Click the image to open in full size.

Simulation according to HornResp:
Click the image to open in full size.
__________________
I don't suffer from insanity. I enjoy every minute of it.
Have a look at my favorite thread: Interesting YouTube video clips
  Reply With Quote
Old 13th November 2012, 02:19 PM   #27
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
There must be some losses around the driver/internal divider cutout to get such a low average gain BW, indicating that getting this just right might be a tedious endeavor. I've done similar by 'gapping' the driver to the baffle, though a lot quicker/easier of course.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 13th November 2012, 02:31 PM   #28
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by DeonC View Post
That, and I'd like to see what the effect of a Karlson cut in the port will have.
Slotting the vent does lower the vent's Q with the trade-off being that it will raise Fp to some mean based on the slot's flare rate. Bottom line is there will be less bass gain BW unless a really large/long vent is used just to get the same amount of bass, same as when using multiple vents of differing lengths like Dr. Geddes has done on BP alignments, though it will be better damped like MLTL loading generates, or just using Olson's vent critical damping routine for that matter and why a combination of the latter two is what I normally use.

Like you say though, only one way to know for sure if it's worth all the extra effort.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  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
Altec 416b MLTL, design by GM westend Multi-Way 10 23rd April 2011 01:56 AM
Has anyone rear ported the GM MLTL 48 ? batdan Full Range 3 15th December 2009 06:00 PM
GM MLTL fine tuning loninappleton Full Range 35 17th April 2008 07:31 PM
Veneering the JX92S GM MLTL LizardBrain Full Range 10 5th April 2006 09:31 PM
Pictures of GM MLTL-48? PrimaLuna Full Range 28 2nd February 2006 10:01 AM


New To Site? Need Help?

All times are GMT. The time now is 03:40 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