Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

TABAQ TL for Tang Band
TABAQ TL for Tang Band
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 February 2017, 08:13 PM   #1651
Pavel Znamenacek is offline Pavel Znamenacek  Czech Republic
diyAudio Member
 
Join Date: Jan 2017
Default Few questions to the construction of Tabaq

Hello everyone,

Should I have a few questions to the construction of Tabaq:
1. I studied the modified plan Tabaqat from Bjørn, and I tried to draw it here – option „A“. I hope it's right. On this plan is also the second option "B" with a different shape of port. The port is of course still the same length (9.7 cm), but it is headed down. This allows the driver to move higher (closer to ears). Is this second variant „B“ better than the first „A“?

2. Bjørn told me, that sharp edge on a corner cabinet is not good, but unfortunately I did not understand, if I may move side wall enclosure in front of the front wall (about 3-4 mm), if the corners are rounded as shown here.

3. How a lot use of wool? Do i understand correctly that into the whole area of the upper 2/3 of the cabinet will give a total 100 g of wool? If Bjørn did this already calculated, it makes sense to try a different quantity?

Thanks everyone for your help and advice

Bye Pavel
Attached Images
File Type: png Tabaq variants.png (61.0 KB, 354 views)
File Type: png Front side design of corner.png (701.7 KB, 353 views)
  Reply With Quote
Old 24th February 2017, 01:26 AM   #1652
Jerms is offline Jerms  United Kingdom
diyAudio Member
 
Join Date: Jun 2015
Location: High Wycombe, Bucks, UK.
1. Your solution is one option to raise the level of the driver slightly.... Another way would be to angle the cabinet backwards slightly whilst including a longer rear foot-print.

2. There is a thing called baffle step diffraction. This happens around the frequencies where the wavelength approaches that of the distance from the driver to the edge of the cabinet. Essentially, a sharp edge angle results in a more violent transition zone with greater magnitude. A large radius edge to the cabinet (as large as practical), eases the transition allowing it to be dealt with more easily by electronics or DSP.

3. Dacron or a blend of synthetic fibres with wool or cotton is the usual cabinet stuffing or wadding material. It's the cheapest reasonable option. Either "van insulation" or specialist audio products like MDM2 or Sonofil.

Another place to avoid sharp edges is the driver mounting area. As it's a full range driver, it should be recessed so the front plate is flush with the front face of the baffle.

HTH

J.
  Reply With Quote
Old 24th February 2017, 05:40 AM   #1653
eljoantonyn is offline eljoantonyn  India
diyAudio Member
 
Join Date: Jan 2014
Click the image to open in full size.
Quote:
Originally Posted by eljoantonyn View Post
SO, to measure the effect of polyfill on the SPL, I did a test.
I generated test tones using my PC (Xonar DX soundcard) and fed it to the TABAQ left channel through my Yamaha AS500 amp. The SPL measurement was done with my iPhone placed at 50cm from the driver.

Here is the result but I don't know how to analyse it
Adding more polyfill muffles higher frequencies, right ?

So, should I just fill both speaker cabinets with 100gm of polyfill and call it a day ?

Edit:
By the way, I made a mistake in cutting the MDF panel and now the speaker is placed 220 mm from the inside of the top panel. Should I correct it to 203 mm ?

Last edited by eljoantonyn; 24th February 2017 at 05:50 AM.
  Reply With Quote
Old 24th February 2017, 05:54 AM   #1654
eljoantonyn is offline eljoantonyn  India
diyAudio Member
 
Join Date: Jan 2014
Subjectively, the speakers sound very good. The bass quantity is low but the quality is very good ! Its hard to believe a tiny 3" driver can produce this kind of bass !!

Amazing work Bjorn !
Its a wonderful design...hats off
  Reply With Quote
Old 24th February 2017, 09:20 AM   #1655
Bjohannesen is offline Bjohannesen  Denmark
diyAudio Member
 
Join Date: Jan 2005
Location: Copenhagen
Hi Pavel

1. Your design A or B: Go for B, you have already stated the benefit.

General about stuffing: The "perfect" stuffing is simulated to be 100 gram. However, do your own final adjustments by ear if you like.

Hi
Bjørn
__________________
http://www.kvart-bolge.com/
  Reply With Quote
Old 24th February 2017, 09:35 AM   #1656
eljoantonyn is offline eljoantonyn  India
diyAudio Member
 
Join Date: Jan 2014
What about my mistakes?

The length of the speaker cabinet is more by 17mm. Also the driver is placed 17 mm shallower than it is necessary!!

Should I correct it ?
  Reply With Quote
Old 24th February 2017, 02:16 PM   #1657
Jerms is offline Jerms  United Kingdom
diyAudio Member
 
Join Date: Jun 2015
Location: High Wycombe, Bucks, UK.
Quote:
Originally Posted by eljoantonyn View Post
What about my mistakes?

The length of the speaker cabinet is more by 17mm. Also the driver is placed 17 mm shallower than it is necessary!!

Should I correct it ?
It's not going to make very much of a difference. Though if you want to get it closer to the defined model, 15mm or 18mm plate could be installed inside the top cap..... Assuming it's not all glued around 4 sides. Otherwise "Mr saw" would be required to start the adjustment.
  Reply With Quote
Old 24th February 2017, 03:47 PM   #1658
eljoantonyn is offline eljoantonyn  India
diyAudio Member
 
Join Date: Jan 2014
Quote:
Originally Posted by Jerms View Post
It's not going to make very much of a difference. Though if you want to get it closer to the defined model, 15mm or 18mm plate could be installed inside the top cap..... Assuming it's not all glued around 4 sides. Otherwise "Mr saw" would be required to start the adjustment.
Never been a big fan of Mr Saw. So, I will go the 17mm mdf gluing inside the top cap route 😄
  Reply With Quote
Old 24th February 2017, 11:57 PM   #1659
Pavel Znamenacek is offline Pavel Znamenacek  Czech Republic
diyAudio Member
 
Join Date: Jan 2017
Red face sorry I still don´t understand

Quote:
Originally Posted by Jerms View Post
1. Your solution is one option to raise the level of the driver slightly.... Another way would be to angle the cabinet backwards slightly whilst including a longer rear foot-print.

2. There is a thing called baffle step diffraction. This happens around the frequencies where the wavelength approaches that of the distance from the driver to the edge of the cabinet. Essentially, a sharp edge angle results in a more violent transition zone with greater magnitude. A large radius edge to the cabinet (as large as practical), eases the transition allowing it to be dealt with more easily by electronics or DSP.

HTH

J.


Hi Jerms,

Thanks for your answers, but unfortunately I still do not understand the item 2.
Can I make a side wall so as in the picture above? If so, it will be noticeable deterioration in sound or insignificant?

Thanks Pavel
  Reply With Quote
Old 25th February 2017, 12:09 AM   #1660
Pavel Znamenacek is offline Pavel Znamenacek  Czech Republic
diyAudio Member
 
Join Date: Jan 2017
Hi Bjørn,

thank You very much

Bye Pavel
  Reply With Quote

Reply


TABAQ TL for Tang BandHide 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

Forum Jump

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 02:16 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki