What enclosure type for this cheap trick driver? - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 September 2010, 09:07 AM   #1
Ibex is offline Ibex  Austria
diyAudio Member
 
Join Date: May 2009
Default What enclosure type for this cheap trick driver?

Cheers!
I've got a punch of these low price 5" bass drivers and I want to design a suitable sub for these cheap woofers.
Do you have any recommendations for me referring to the enclosure type to get a serious low end out of these 5"?

Here are the TSP:

fs = 72,6 Hz
Re = 7,5 Ohm
Qes = 0,41
Qms = 2,37
Qts = 0,35
Vas = 5,25 L
Cms = 0,47 mm/N
Mms = 10,13 g
Sd = 88 cm²
BxL = 9,2 N/A
Rms = 1,9 kg/s
Le = 1,77 mH

I was thinking of some type of bose 8th order bandpass style would do the job, but I would prefer something hornloaded ( i.e. TH/RLH or compound horn style).
Thx in advance for your help!
gzg
  Reply With Quote
Old 6th September 2010, 10:54 AM   #2
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Horn loading might work (not my area of expertise), but a sealed box with eq would work, especially if you have a lot of the drivers. What are the size limitations?
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 6th September 2010, 03:34 PM   #3
zobsky is offline zobsky  India
diyAudio Member
 
zobsky's Avatar
 
Join Date: Mar 2002
Location: Dallas, Tx, USA
Here's a tapped horn design, and tweak in horn resp as desired. The throat size is too small, so my suggestion would be to use a multiple of drivers (say 2), and increase all the cross sectional areas by that number.


I don't know what X max is but I managed to drag response down to 40 Hz (about an octave below driver Fs) where you're Xmax limited to 5 watt input per driver . SPL at that point is about 105 - 110 db, with room gain flattening out the response.
Attached Images
File Type: png Capture.PNG (37.6 KB, 333 views)
File Type: png Capture2.PNG (53.7 KB, 324 views)
__________________
"Any fool can know. The point is to understand" - Albert Einstein
  Reply With Quote
Old 6th September 2010, 04:02 PM   #4
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by Ibex View Post
Do you have any recommendations for me referring to the enclosure type to get a serious low end out of these 5"?
Greets!

It will take ten drivers to = a 15", though with only 2-3 mm of usable excursion at best and with a ~15 Hz low cutoff capability (FL) you'll have to define 'serious' to see if you have enough drivers to go low with any authority.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 6th September 2010, 07:24 PM   #5
Ibex is offline Ibex  Austria
diyAudio Member
 
Join Date: May 2009
Thank you for your replies!
Of course, my intension was to use multiple drivers in a single enclosure, let's say about 8 pieces. I was thinking of an push-pull arrangement as well, like in danley's DTS-10, to avoid linear harmonic distortion caused by the motor and to get a better cone control due to less excursion.
To get the smallest excursion as possible I thought a TH design would be the best choice. What do you think?
Unfortunately I don't know the Xmax of the driver and I realy don't know what the driver is capable to do. Power ratings are 90W continous/180W programm.

What about these bose type woofers in the acoustimas sub modul? I always thought that they are small and offer a small Xmax as well or am I wrong?
That's why I first was thinking to suit my 5" drivers in a bose style bandpass enclosure... would you disadvise me to design something similar?

Size limitations of the whole enclosure would be about ~500L brutto.
  Reply With Quote
Old 6th September 2010, 07:36 PM   #6
Dr_EM is offline Dr_EM  United Kingdom
diyAudio Member
 
Dr_EM's Avatar
 
Join Date: Oct 2006
Location: Swindon
In that case, that tapped horn scaled to utilise 8 drivers might be nice
  Reply With Quote
Old 6th September 2010, 09:06 PM   #7
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Default Octet Tapped Horn?

Here is a tapped horn with throat chamber coupled to horn.
Attached Images
File Type: jpg Octet_small.jpg (84.0 KB, 300 views)
__________________
Oliver
  Reply With Quote
Old 7th September 2010, 11:47 AM   #8
Ibex is offline Ibex  Austria
diyAudio Member
 
Join Date: May 2009
Wow, the TH design looks quiet good!

I got the chance to take measurements of the voice coil and the pole plate to caculate the linear excursion of the driver. Here you are:

Magnetic Gap Depth = 5.25mm
Voice Coile Winding Depth = 10.5mm

I would assume that Xmax would be 2.5mm in one direction...?

Would be interesting to see where the output of the TH is limited by the excursion.
  Reply With Quote
Old 7th September 2010, 11:51 AM   #9
Ibex is offline Ibex  Austria
diyAudio Member
 
Join Date: May 2009
Quote:
Originally Posted by tb46 View Post
Here is a tapped horn with throat chamber coupled to horn.
why did you implement a chamber between the driver and the throat?
is there a reason to port the chamber with an offset into the horn and not at the beginning of the TH?
  Reply With Quote
Old 7th September 2010, 02:16 PM   #10
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Hi Ibex,

I added the throat chamber as an option, and to minimize the L12 distance. Shortening L12 strongly affects the impulse response. Without knowing the rough external dimensions desired this looked like a reasonable first stab at a simulation.

As to the Xmax, even if you add half the gap depth you don't come anywhere close to what you would like to see in a driver build for subwoofer duty (see Post #4 by GM).

Regards,
__________________
Oliver
  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
finished Cheap Trick CT 227 with Aurasound NS3-193-8A Ralphono Full Range 5 31st May 2007 05:27 PM
What type of enclosure?? e-side Multi-Way 5 25th December 2005 06:17 PM
Plans for Visaton Cheap Trick 142 mr_push_pull Multi-Way 13 3rd July 2004 01:09 PM
Q:cheap trick 142 Tomac Multi-Way 0 21st December 2003 07:18 PM


New To Site? Need Help?

All times are GMT. The time now is 03:17 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