2" madness :) hornloading the TB-W2-803SM - Page 5 - 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 6th April 2014, 10:22 PM   #41
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
other than the possibility of dips from throat size, might this Faital 3" also make a viable candidate with existing 2" format horns? (a cheap round waveguide could be easily cut to accommodate 2" or 3")


http://www.parts-express.com/pedocs/...ifications.pdf

it would be interesting to compare the distortion of a small speaker on a horn vs baffle vs conventional compression driver and see if the small speaker can be annulled/matched with a back chamber
  Reply With Quote
Old 8th April 2014, 04:06 PM   #42
diyAudio Member
 
Join Date: Feb 2010
Location: Sweden
Some details and rough RTA measurements of the unholy union.

Driver:
2" Tangband W2-803SM full-range.

Horn:
JBL 2386.

Circuit:
Serial connected (R) 2 x 4,7Ohm in parallel with (C) 8,2uF.

Amp:
LAB IP450

XO:
DBX 223 XL

Source:
Audacity on Linux (generating pink noise)

RTA:
Phonic PAA2 measuring non weighted.

Distance:
1 Meter

The measurement setup :
Click the image to open in full size.

The driver and circuit complement :
Click the image to open in full size.

Measurement with HP set at 45Hz 24dB/Oct 1M:
Click the image to open in full size.

Measurement with HP set at 250Hz 24dB/Oct 1M:
Click the image to open in full size.

Measurement with HP set at 350Hz 24dB/Oct 1M (prefered):
Click the image to open in full size.

It sounds a lot better then the graphs would have you believe, and the SPL capacity is greater the the drivers would have you believe.
  Reply With Quote
Old 9th April 2014, 10:47 AM   #43
diyAudio Member
 
Join Date: Feb 2010
Location: Sweden
A rough approximation of the response based on the graphs above :
Click the image to open in full size.

The horisontal lines on the PAA2 RTA is spaced 10dB apart, 240Hz XO setting is used in the example.
  Reply With Quote
Old 12th April 2014, 02:37 PM   #44
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Hi!
Nice project! It looks so that your horn also broke the "3-octave horn bandwidth rule".... (like the ORIS or Avantgarde horns)
Many people says that it would be not possible....
I also would like to try something similar with 3" drivers in the ca. 200-16000Hz region.

Greets:

Tyimo
  Reply With Quote
Old 13th April 2014, 02:46 AM   #45
diyAudio Member
 
Join Date: Aug 2007
I believe as soon as you add significant compression ratio (say 2:1 or greater) the 3 octave rule will come into play, no?

This horn/driver combo has a very low compression ratio, low enough one might just consider it a waveguide? Without the need for a phase plug to compensate for HF loss in a compression chamber it operates wide open on the top end and breaks that 'rule'.
  Reply With Quote
Old 13th April 2014, 10:43 AM   #46
Tyimo is offline Tyimo  Hungary
diyAudio Member
 
Join Date: Nov 2002
Location: Hungary
Hi!

I read in another thread:
Quote:
Horns that are:
a) not folded
b) not using a compression driver (or not using a conventional driver with a compression chamber)
can achieve bandwidths greater than 3 octaves.
Greets:
Tyimo
  Reply With Quote
Old 14th April 2014, 07:33 AM   #47
diyAudio Member
 
Join Date: Feb 2010
Location: Sweden
Quote:
Many people says that it would be not possible....
Many people would not even bother listening to this system if described to them and why would they, honestly, there is nothing about this combination that makes sense, let's recap the events that lead up to this shall we?

1. A cheap 2" TB fullrange with a neo magnet the size of an thimble somehow got mounted on one of the most evil 2" horns ever created, worlds apart in design goals as well as intented usages, one being arena distance HF projection, the other a tv casing driver, how could that ever work? it is boderline insulting the the respective design teams at JBL and TB to even contemplate doing something like this.

2. But that's not all, to come up with the idea in the first place you would have to not only have in your possesion these two extremly different devices (a clear sign of strangeness) but then also have the type of mind to say "hang on..." and put them togheter (a sign of a slitghtly devienat mental disorder) but that's not enough, no, you then have to go even further and design a small compensating circuit for it (a sign of severe and most likley diagnosable audiophile disorder)

But nothing top's the final and definite sign of "severe auidophile something something mental somtehing maina", and that is posting your findings on a internationally well regarded forum, not easy wearing a straight jacket, niether was mounting the drivers

Kidding aside, it was a fun thing to try, and it panned out pretty well, but I'm sure it could be done alot better but one thing is for sure, hornloading is now a part of my future, it does do wonders for the sound.
  Reply With Quote
Old 14th April 2014, 11:07 PM   #48
Flaesh is offline Flaesh  Russian Federation
diyAudio Member
 
Flaesh's Avatar
 
Join Date: Dec 2009
Location: Eburg
!
may be I'll try to stick ~1.5" microlabs to 2380. (2380 are modified to 1.4")
__________________
flesh flash flush
  Reply With Quote
Old 16th April 2014, 08:13 AM   #49
diyAudio Member
 
cradeldorf's Avatar
 
Join Date: Nov 2010
Location: Muskegon Mi.
Quote:
Originally Posted by martinsson View Post
By the way, an important thing to mention, if you try this you will need to know the components involved.

For the filter circuit i use a 8,2uF capacitor paralelled with two serial connected 4,7Ohm resistors (it's what I had at the time)., so in simpler terms its a 8,2uF capacitor paralelled with a 9,4Ohm resistor.

.
So it's like a zobel? cap then resistor across the leads? or a cap from the + to- and a resistor from the + to the -? the reason I ask is because I might try it.
__________________
If only time will tell, then obviously time is a snitch.
  Reply With Quote
Old 16th April 2014, 01:48 PM   #50
Flaesh is offline Flaesh  Russian Federation
diyAudio Member
 
Flaesh's Avatar
 
Join Date: Dec 2009
Location: Eburg
2380 series horns need EQ: https://www.jblpro.com/pages/pub/components/2386.pdf
__________________
flesh flash flush
  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
WTB: Tang Band W2-803SM ernperkins Swap Meet 1 7th November 2011 06:34 PM
"Tiny Towers", stupid simple build for TB W4-930SF Tom V Full Range 15 14th August 2010 08:42 AM
Low xmax (Fostex) - vs "healthy" (TB)/heat & real world dynamic capibility-? freddi Full Range 11 6th May 2010 07:22 AM
TB W6-789S "Almost" Full Range project Pano Full Range 2 23rd May 2008 10:18 AM
WTT: I have TB 4" and Tympany 1" for TT cartridge? mpmarino Swap Meet 17 19th October 2007 06:03 PM


New To Site? Need Help?

All times are GMT. The time now is 10:44 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