P.A. 18 TH (18tbw100 30x38x22.5") - 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 12th September 2013, 08:19 PM   #1
diyAudio Member
 
Join Date: Jan 2011
Default P.A. 18 TH (18tbw100 30x38x22.5")

Ran a quick rough calculation and rough sims, here is what i came up with.

internal cabinet width 21"
external dimms 30"x38"x22.5"

driver is b&c 18tbw100

http://www.parts-express.com/pe/show...umber=294-6008
$387 from P.E.
$352 shipped from savinglots.com
input screen
Click the image to open in full size.
and with 2.83V
Click the image to open in full size.

and with 900w
Click the image to open in full size.

Same exact fold as the PAL12. Driver center (10" from s1) is moved up in the throat so it will physically fit in the cabinet. Other lengths shortened accordingly.
18mm Baltic birch recommended.

Last edited by m R g S r; 12th September 2013 at 08:33 PM.
  Reply With Quote
Old 12th September 2013, 08:20 PM   #2
diyAudio Member
 
Join Date: Jan 2011
cabinet can likely handle more power...the 18tbw looks to be a good strong driver
  Reply With Quote
Old 12th September 2013, 08:58 PM   #3
diyAudio Member
 
Join Date: Jan 2011
I'm not in fromt of the computer anymore. I will run it later.
Reason I did it this way was due to Art's suggestion in my other thread, using two different subwoofers...
Wanted to keep the same fold as the PAL12 just with a wider cabinet
  Reply With Quote
Old 12th September 2013, 09:07 PM   #4
epa is offline epa  Netherlands
diyAudio Member
 
Join Date: Apr 2010
Location: amsterdam
just a sugestion

ID=28.00
Ang=2.0 x Pi
Eg=2.83
Rg=0.00
Fta=3.37
S1=546.00
S2=546.00
Con=0.10
F12=0.00
S2=546.00
S3=1031.00
Con=105.00
F23=0.00
S3=1031.00
S4=1644.00
Con=104.00
F34=0.00
S4=1644.00
S5=2000.00
Con=40.00
F45=0.00
Sd=1210.00
Bl=26.49
Cms=8.38E-05
Rms=6.78
Mmd=222.56
Le=2.45
Re=5.30
TH=1
Vrc=0.00
Lrc=0.00
Ap1=0.00
Lpt=0.00
Vtc=30000.00
Atc=1001.90
Pmax=100
Xmax=5.0
Comment=18tbw100

edit/ah yes i remember the topic now.
anyway you can try, it maybe a testbox .
looks like you can get a bit more in the 60-80 range
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db

Last edited by epa; 12th September 2013 at 09:14 PM.
  Reply With Quote
Old 12th September 2013, 10:30 PM   #5
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
seller TSG at Ebay has or had some custom Eminence 18 with claimed 5" coils and 160oz slug


TSG 18 inch Subwoofer 5 inch Voice Coil Free Shipping Any Reasonable Offers | eBay

TSG 18-250 18" Subwoofer
with 5 Inch (125 mm)Voice Coil
Call 801-771-1820 with any questions.
SPECIFICATION
Nominal Basket Diameter 18", 460mm
Nominal Impedance* 8 ohms
Power Rating
RMS Watts 800W
Music Program 1600W
Resonance 35Hz
Usable Frequency Range 34Hz-3.7kHz
Sensitivity*** 99 db
Magnet Weight 160 oz.
Gap Height
Voice Coil Diameter 5", 125 mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 35 Hz
DC Resistance (Re) 5.0 ohms
Inductance 3.0mh
Mechanical Q (Qms) 9.21
Electromagnetic Q (Qes) .29
Total Q (Qts) .28
Compliance Equivalent Volume (Vas) 249.4 liters / cu.ft.
Peak Diaphragm Displacement Volume (Vd) cc
Mechanical Compliance of Suspension (Cms) mm/N
BL Product (BL) 24.3 T-M
Diaphram Mass inc. Airload (Mms) 148 grams
Efficiency Bandwidth Product (EBP)
Maximum Linear Excursion (Xmax) mm
Surface Area of Cone (Sd) cm2
Maximum Mechanical Limit (Xlim) 12 mm

MOUNTING INFORMATION
Recommended Enclosure
Sealed
Vented
Overall Diameter
Baffle Hole Diameter
Front Sealing Gasket Fitted as standard
Rear Sealing Gasket Fitted as standard
Mounting Holes Diameter 0.28", 7.1mm
Mounting Holes B.C. D.
Depth
Net Weight 35.7 lbs.,
Shipping Weight 73.9 lbs.,

MATERIALS OF CONSTRUCTION
Coil Construction Aluminum voice coil
Coil Former Polyimide former
Magnet Composition Ferrite magnet
Core Details Vented core
Basket Materials Die-cast aluminum basket
Cone Composition Paper Cone
Cone Edge Composition Cloth cone edge
Dustcap Composition Solid composition paper dust cap
  Reply With Quote
Old 13th September 2013, 07:42 AM   #6
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by m R g S r View Post
I'm not in fromt of the computer anymore. I will run it later.
Reason I did it this way was due to Art's suggestion in my other thread, using two different subwoofers...
Wanted to keep the same fold as the PAL12 just with a wider cabinet
IIRC, that response is more "saddled" than the Lab 12.

Would you post a comparison or the two responses?
  Reply With Quote
Old 13th September 2013, 12:47 PM   #7
diyAudio Member
 
Join Date: Jan 2011
Both sims show a 4db dip. Once I get back on my computer ill do a direct comparison of the two
In testing the dip on the PAL12 cabinet wasn't that bad. It was there, but not as exaggerated as hornresp made it seem
  Reply With Quote
Old 13th September 2013, 08:13 PM   #8
sine143 is offline sine143  United States
diyAudio Member
 
Join Date: May 2010
Is there any way you can adjust the scale on the REW measurments to match the scale of hornresp? i have no idea why REW rrpresents data on a 10db scale, cause that pretty much makes everything look 'flat'
  Reply With Quote
Old 13th September 2013, 09:52 PM   #9
diyAudio Member
 
Join Date: Jan 2011
This is from the PAL12 measurement.
Click the image to open in full size.

Ignoring the 80hz and up peak, from 38hz up with no EQ....it's +/- 2-3db.

The sim showed more of a dip in there...
  Reply With Quote
Old 13th September 2013, 10:25 PM   #10
sine143 is offline sine143  United States
diyAudio Member
 
Join Date: May 2010
I agree that below 80hz it is quite flat. however, without actual 2.83v 1 meter measurement ithink its hard to say this is actually due to 'better results' when compared to the sim. while i agree you are only about -2/3db between your 40hz peak and your 60hz valley, its still about 6db down from its 95hz peak, which is more in line with the sim. this suggest to me that rather than 'gaining sensitivity' in the 50 to 70hz range, you've just lost a little bit of the low freq peak, which makes it appear flatter, but is a result of lost sensitivity.

This could also be a product of slight lf rolloff of the measurement mic i suppose, and initialy i thought this was one of the 30hz filter graphs, which would put it like 1.5db down at 40 hz but at second glance that doesnt seem to be the case

Last edited by sine143; 13th September 2013 at 10:28 PM.
  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
pro woofers 12" , 15" AND 18" DATASHEET? inertial Multi-Way 6 3rd August 2013 01:21 PM
Scaling up the SS15 for an 18" driver and other compact 18" designs col Subwoofers 32 23rd January 2012 11:17 PM
WTB 15" or 18" high qt. drivers homemade Swap Meet 13 14th June 2010 08:15 PM
Can I multiply an 18" folded horn cab by 0.8 for a 15"? Optical Subwoofers 7 31st October 2004 05:37 AM


New To Site? Need Help?

All times are GMT. The time now is 01:34 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