TABAQ TL for Tang Band - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 23rd October 2006, 02:13 PM   #11
diyAudio Member
 
Join Date: Jan 2005
Location: Copenhagen
Hi Solve,

if you look at the plots, the 4" has a more gentle roll off and goes deeper. This is simulations only, however.

But I would expect the 4" to do better than the 3" if you compared them in real life. The 4" has a lower Qtc etc.

I focused on the 3" because they are cute, cost "nothing" and are doing so well. This is the experience in other contructions as well.

Bjorn
Attached Files
File Type: pdf tb 3 and 4.pdf (30.0 KB, 2055 views)
  Reply With Quote
Old 28th October 2006, 10:13 PM   #12
gaust is offline gaust  United Kingdom
diyAudio Member
 
Join Date: Mar 2005
Location: newcastle
Hi Bjorn,

First of all a big thanks for your plans. I have started to make a pair of these speakers today - all cut and started glueing. One question I now have is that the driver position seems low compared to ear level. Can these be put on stands, or is the response modelled with the floor gain included and hence something would be lost.

I have a second question for whoever can answer it - where is the best source from the UK to buy the resistor and inductor for the notch filter. Also what types are recommended - i.e. air core inductor vs ferrite etc and type and rating of the resistor. Any advice on this would be greatly appreciated.

Cheers
  Reply With Quote
Old 29th October 2006, 03:12 AM   #13
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
Default Re: TABAQ TL for Tang Band

Quote:
Originally posted by Bjohannesen
I am starting this thread not to mix up things like I did on http://www.diyaudio.com/forums/showt...08#post1036908



I am impressed, however, how much you can get out of these small drivers.

I have tested my TABAQ with TB W3-926S and W3-315SC. Both are doing well.

I have enclosed the simulations.


Hi from
Bjorn

Thans Bjorn, good work, your file is most complete and understandable for this newbie,

thanks,

gychang
  Reply With Quote
Old 29th October 2006, 06:36 AM   #14
Svein_B is offline Svein_B  Norway
diyAudio Member
 
Join Date: Oct 2005
Default Filters for the W3-871S

Here is a little survey of [notch]-filters for the W3-871s, with the addition of a few personal opinions and analysis.

Bjohannesen is suggesting a traditional BSC filter for the TABAQ. This will attenuate everything above about 1.3 KHz by a few dB.

Due to the falling off-axis HF response of full rangers, it may be desirable to avoid damping the higher frequencies. Most designs with the W3-871s are therefore recommending a notch-filter. This notch serves two purposes; it will reduces a small bump in the speaker's natural response in the 1.5-3 KHz area, and the baffle step hump is in the same vicinity.

Cyburgs Needle : 0.56mH, 6.8uF, 6.8ohm (fo=2.6KHz)

The Lancetta: 0.56mH, 6.8uF, 6.8ohm, the same as the Needle. The article in Hobby HiFi 6/2004 also show measurements for the very slight variations when changing values; L 0.39-0.82, C 4.7-10, and R 4.7-10.

ZaphAudio also had an article on their web site some time ago with measurements of filters for different boxes with W3-871s.
Very narrow low-diffraction box: 8.2uF, 0.7mh 6.8ohm (Fo=2.1 KHZ).
5.75" wide box: 3.3uF, 0.7mH, 6.8ohm (Fo=3.3KHz)

Regarding component choices:
Inductors: Most designers recommend good quality air-core inductors with thick AWG16 wire or copper-foil. A more modest coil with 0.8mm wire (AWG20) will have R=0.8ohm. This has the effect of slight rise of Qts from 0.59 to 0.65. I would be satisfied with this since the smaller size is much cheaper and easier to fit in the cabinet without obstructing the air-flow.

Caps: Exotic "boutique" caps may be the best, but kind of ruins the budget approach of using a cheap driver in the first place. I use cheap polyester-foil capacitors, and avoid Solen/SCR polyprop since I feel they add a hard glassy sound - just what the filter was intended to reduce.

MOX resistors seem to be in fashion these days. If you can not find them, use simple wire-wound.

Personally I use the Needle/Lancetta filter with budget parts, and very happy with that.

SveinB
  Reply With Quote
Old 29th October 2006, 12:55 PM   #15
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
Default Re: Re: TABAQ TL for Tang Band

Quote:
Originally posted by gaust
Hi Bjorn,

First of all a big thanks for your plans. I have started to make a pair of these speakers today - all cut and started glueing.

Cheers

would appreciate your subjective listening experience afterward, with and without filter.

thanks,

gychang
  Reply With Quote
Old 29th October 2006, 10:51 PM   #16
gaust is offline gaust  United Kingdom
diyAudio Member
 
Join Date: Mar 2005
Location: newcastle
Thanks for the full and detailed reply Svein_B. So from what you say it sounds like a notch filter would be best, rather that just the BSC that has been proposed. I guess the other advantage of using the notch filter from Cyburgs needle would be that I can test the filter with this enclosure also. I'm going to spend some time searching for hopefully suitable inductors, capacitors and resistors tonight.

Gychang - I'll post again with listening impressions once I have the filters and cabinets finished!!
  Reply With Quote
Old 30th October 2006, 10:46 AM   #17
gaust is offline gaust  United Kingdom
diyAudio Member
 
Join Date: Mar 2005
Location: newcastle
I am now considering having an external notch filter that can be tranferred between cabinets and based on the values for the needle. Should I buy the components from a known audio shop e.g. IPL or Wilmslow Audio from the UK (or another audio shop).

I am tempted by the idea that Svein_B suggested that since this is supposed to be a budget project using notch filter components that cost more than the driver and cabinets combined sounds like overkill - could someone recommend cheaper alternatives - e.g. are there caps / resistors / inductors from e.g. Maplin or RS or Rapid electronics that would do the job. Specifically the polyester foil caps that Svein_B suggested.

Thanks again for any help.
  Reply With Quote
Old 30th October 2006, 01:47 PM   #18
diyAudio Member
 
Join Date: Jan 2005
Location: Copenhagen
About the notch filter: It is calculated by the use of MJK software and is designed for the actual TABAQ cabinet.

The filter is taking care of the otherwise lift in SPL from about 700 Hz.

Other cabinets might need other values for a filter.

I know the driver is not in the perfect position when placed on the floor. The software from MJK simulate distance from back wall, not the hight above the floor.

I have not done much testing with the speaker placed higher.

Bjorn
  Reply With Quote
Old 31st October 2006, 06:11 PM   #19
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
I have pre built my TABAQ, still one wall not glued yet, just clamped.I put in a pair of w3-871 while il wait for my w4-1320.
I took what i had to make an BSC filter.
0,8 mh+6,8ohm.
What frequens is that?
How it sounds?
I must say it sounds very good!!
Very good bas and well balanced sound.
Easy to build.
My wife like them!
I cant compare with needle or any other TL beacause this my first build.
In a few dayes i get my w4...
Just wonder if its going to get boomy?
Maybe build them in 16mm MDF?
__________________
Music is the only art in real time....
  Reply With Quote
Old 1st November 2006, 08:24 PM   #20
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
I dont know if as usual when you build something and WANT it to sound good and the brain slowly accept it as good means that it is good.
But this must be the DIY kit for the Tangband W3-871!
Easy to build!
Sounds very good!!
But, still not clear with 12mm MDF board.
Could feel some "booms" sometimes.
Why 12mm?
If i goe to 16mm not worth it?
Tell me!

Im an musician and have worked as sound enginer so i have critical ears.
I hope...


For you jazzlovers-check Esbjorn Svensson latest.
__________________
Music is the only art in real time....
  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
Tang Band W3-593SF vs. Tang Band W3-926SD Zaputh Full Range 17 5th June 2009 11:37 PM
Tang Band MTM ? wrenchone Multi-Way 11 21st November 2007 06:39 PM
8 x 12 Tang Band troystg Subwoofers 3 2nd February 2007 03:37 AM
Tang-band 2-way (W3+W8) haffe Multi-Way 10 31st January 2007 11:11 PM
New Tang Band is BUSTED! Zero Cool Subwoofers 6 8th May 2006 04:15 PM


New To Site? Need Help?

All times are GMT. The time now is 12:47 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