Im stuck with ML TQWT sim. Any help? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 13th December 2003, 11:45 AM   #1
Rudolf is offline Rudolf  Germany
diyAudio Member
Rudolf's Avatar
Join Date: Mar 2003
Location: Germany
Default Im stuck with ML TQWT sim. Any help?

I have tried to do a M. King-Simulation for the Gradient W 160 AL 8 woofer. Pic 1 shows its TSP and my sim data, Pic 2 the calculated SPL and phase diagramms.
I know that it can be done better, but changing the different parameters leads me nowhere. I constantly get lost in the many adjusting screws I can turn.
Can anybody lead me to the appropriate changes/values? Particularly I have no idea, when to change the port values and how to calculate them correctly.

My goal is a flat response with Xmax staying below 3 mm. Efficiency is not an issue, because play back levels will be low.

Thanks for your effort.
Attached Images
File Type: gif grad_tsp.gif (5.9 KB, 818 views)
  Reply With Quote
Old 13th December 2003, 11:51 AM   #2
Rudolf is offline Rudolf  Germany
diyAudio Member
Rudolf's Avatar
Join Date: Mar 2003
Location: Germany
Default pic 2 for previous post

The SPL diagramm:
Attached Images
File Type: gif grad_spl.gif (13.5 KB, 728 views)
  Reply With Quote
Old 13th December 2003, 04:02 PM   #3
GM is offline GM  United States
diyAudio Member
GM's Avatar
Join Date: Jun 2003
Location: Chamblee, Ga.
Actually, for this driver you did pretty darn good! This driver's specs don't lend themselves to plotting the classic T/S max flat alignment due to the high aspect ratio required. I have a fairly good way to quickly calculate pipes and couldn't improve on yours by much, and it's debatable as to whether there's any audible difference. Frankly, as low as these are tuned, whichever alignment you build may require a longer vent to blend into the room's gain better so will probably look more like yours than mine once voiced in-room.

Anyway, for a T/S max flat, I get:

L = 42"
So/SL = Sd*2.5729
Xo = 0.3547
Rp = 1.25"
Lp = 4.75"
density = 0.4lbs/ft^3

Since you're not planning on using high power, the vent can be scaled back to Rp = 1", Lp = 2.75" to reduce the upper BW 'ripple' a bit.

To get a bit more LF gain, as you appear to want, I recommend:

L = 52.88"
So/SL = Sd*2.5989
Xo = 0.3352
Rp = 1.25"
Lp = 2.75"
density = 0.4lbs/ft^3

Again, low power vent can be smaller, Rp =1", Lp = 1.5".

Please let us know what you wind up building and what stuffing/vent length you settle on in case someone else wants to use this driver, especially since we're using published specs and our sims could be pretty far off.

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote


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
Try to fix my sub but got stuck. Advice? cfcRebel Subwoofers 24 3rd February 2012 12:31 AM
Stuck on Standby Brouilly Tubes / Valves 16 20th March 2009 05:19 PM
Stuck in a dip ttruman Multi-Way 77 6th June 2008 12:51 PM
Amp stuck on audiobahnkid592 Car Audio 1 8th July 2007 11:31 PM

New To Site? Need Help?

All times are GMT. The time now is 03:04 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2