Go Back   Home > Forums > General Interest > Car Audio

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 19th September 2005, 10:02 AM   #1
BMW M5 is offline BMW M5  United States
diyAudio Member
 
Join Date: Sep 2005
Default Box volume on WinISD/BCAE seems way too small

I have been looking at putting two different drivers in my car that both have a unique "problem" in that WinISD and BCAE box calculators seem to recommend extremely small volumes (at a Qtc of .7)

The first driver is a SoundSplinter RL-p12 D4; the sealed volume I get is 0.300cuft...while Mike recommends 1.25-1.35cuft.
Qts 0.219
Qes 0.242
Qms 2.266
Fs 18.856 Hz
Res 6.26 Ohms
Ls 7.382 m
Lp 9.456 m
Rp 14.68 Ohms
Dia 250 m
(% shift) 33.20%
Vas 142.7 L
Mms 168.8 g
Cms 421.9 u
Bl 22.74
n0 380.1 m
Xmag 26.0 mm
Xsus 24.2 mm
Xmax 24.2 mm
SPL/Sensitivity 87.79 dB
Added mass 212 g
The other driver is a Dayton RS180; the sealed volume I get is 0.013cuft.--I have seen various recommended volumes for an enclosure for this mid and none are anywhere near 0.013cuft.

Specifications: *Power handling: 60 watts RMS/90 watts max *VCdia: 1.5" *Le: .90 mH *Znom: 8 ohms *Re: 6.4 ohms *Frequency range: 40-2,200 Hz *Fs: 38 Hz *SPL: 87.6 dB 2.83V/1m *Vas: .88 cu. ft. *Qms: 2.00 *Qes: .47 *Qts: .38 *Xmax: 6 mm *Dimensions: A: 7-1/8", B: 5-3/4", C: 3-5/8"


Can someone please explain to me what is going on?
  Reply With Quote
Old 19th September 2005, 07:54 PM   #2
diyAudio Member
 
Join Date: Jan 2005
Location: The Great Lakes
Something is really wrong with those specs, make sure there right
i have bass box pro and i also get a very small size.
  Reply With Quote
Old 20th September 2005, 06:37 AM   #3
BMW M5 is offline BMW M5  United States
diyAudio Member
 
Join Date: Sep 2005
Thanks for looking into it, but I am pretty sure they are right. Crazy how the two drivers I am pretty sold on from reviews have this problem. I double checked the specs and they still seem to be right. Here are links directly to them.

http://www.soundsplinter.com/specs/rlp12_specs.htm

http://www.partsexpress.com/pe/showd...number=295-364

Anyone else have a thought on what is going on?
  Reply With Quote
Old 20th September 2005, 01:07 PM   #4
95Honda is offline 95Honda  Germany
diyAudio Member
 
Join Date: Feb 2004
Location: Germany
Look at the electrical Q of the 12. That low and it is going to give you a modeled sealed box very small. The designer proabably found that they work good anyway in the size he reccomends....
__________________
www.forceaudio.com
  Reply With Quote
Old 20th September 2005, 03:19 PM   #5
Drachir is offline Drachir  United States
diyAudio Member
 
Join Date: Sep 2005
Default you put the numbers in wrong

you had WINisd set to liters when you put in the RS numbers, that is why you got such a small box. I tried the same thing and got the numbers you got. PE has their VAS in cuft, not liters. I would go with a .3cuft box (Q=.75) for the RS driver so you get a flatter response to 80Hz and a steeper acoustic rolloff. You are using the RS's as mids, so they don't need the lower extension.
The small Qts of the 12 will net you a small box, this is how it goes. Although I get a box size of .55 cuft with an F3 of 60Hz out of WINisd.
  Reply With Quote
Old 21st September 2005, 06:15 AM   #6
BMW M5 is offline BMW M5  United States
diyAudio Member
 
Join Date: Sep 2005
Wow, do i feel dumb. I relooked at the specs a few times, but when both were off I obviously didn't look close enough and blamed it on the math.

Thanks for your help guys!!!!
  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
crossover mounting in small volume monitors jarsoffart Multi-Way 0 7th June 2009 07:13 PM
Need a small quality volume control lionking7 Parts 2 14th May 2009 01:41 PM
Need A Design - Small (11-12L volume) & High(ish) Output speaker Multi-Way 6 22nd November 2008 12:50 PM
small practice amp with master volume pjpoes Tubes / Valves 1 25th November 2006 11:29 PM


New To Site? Need Help?

All times are GMT. The time now is 03:31 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