Stroker Pro 15 inch for HT linkwitz transform - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 17th November 2011, 12:25 PM   #1
diyAudio Member
Join Date: Jul 2010
Default Stroker Pro 15 inch for HT linkwitz transform

Hi a pair of new stroker pro 15 inch car subwoofers are available for around 1000 USD. I know its mostly SPL driver but has adjustable voice coil bias overhun/underhung. So it could be tuned/djusted for mimimum SPL and greatest SQ.

There are not much HT subwoofers available here and DIY with a high powered is the only way to go making them sealed and powering them with Pro- amplifiers

Fs=26.4 Hz
Xmax=40 mm
Vas=3.6 Cu ft.
sensitivity=86.3 db

Now the manual states both options with vented 3 cu ft, tunned to 36 Hz iwth 2x4inch tubes with 14 inch lenght or SEALED 2.7 cu ft.

Now putting the data in WINISD gives this :Vb=13.7 cu Ft ???? with Fb=30.9 Hz and Qtc=0.795 .... its HUGE but F3= 27.23 Hz.

since its ann HT subwoofer i used Linktwitz Transform with Fo=30.9 Hz, Fp=20 Hz, Qo=0.795 and Qp=0.707. it gives F3=20 Hz now thats cool. with Xmax of 40 mm and 2500 watts power rms.

Now ith 2000 watts applied in simulation the 20 Hz output = 115db!!!!.

1. Ii cannot check the Excusrion in simulation i dunno why?

2. Any guess why the recommended enclosure volume is 2.7 whereas WinIsd Says 13.7 cu Ft???

3. what the quickest way to implement Linkwitz transform ?

4. Are the 20 Hz 115 db figures reliable ???
  Reply With Quote
Old 18th November 2011, 11:49 AM   #2
diyAudio Member
Join Date: Aug 2011
They can do SQ too, have seen very good reviews on that side

1. Don't use windsd, so can't comment, will model in BBpro for you.

2.The recommended boxes for cars will be too small for the home-cabin gain is a car's LT EQ.

3. LT EQ cirucits can be picked up easily: Linkwitz Transform Subwoofer Equaliser

4. I'll see what bbpro says
  Reply With Quote
Old 18th November 2011, 12:07 PM   #3
diyAudio Member
Join Date: Aug 2011
Cerwin Vega Stroker Pro 15 Subwoofer Review - Subwoofer Reviews - Car Audio and Electronics

If put into optimium sealed bbpro comes up with 3.954cf F3 34.25Hz.
Vented comes up with 11.67cf, F3 13.87Hz, tuned to 15.56Hz.
Won't produce xmax graphs either

I've only ever used LT in my car, where it works very well-my enlcousre is 0.126cf and has an Fb of 76Hz-the sub is played totally below this 60Hz'n'down. For home use I've never tried it, but you'd need the EQ to boost below the F3 at 12dB per octave IIRC.
  Reply With Quote
Old 18th November 2011, 03:41 PM   #4
diyAudio Member
Join Date: Jul 2010
Thanks a lot. i want to use it for HT not car 2.7 cubic feet is recommended by CV for car making accomodation for cabin gain.

what do you recommend ported or sealed ? with tunning to 15.56 Hz i dont think i would be needing LT for ported neither i want to mess wtith diy type LT but i do have a 31 band graphic equalizer with dual band paramerteric equalizer from 20-50 Hz variable, Q=0.7-4.0 boost/cut=+/- 12 db . can it do the job if use for Lt or use behringer FBP 2496.
BTW what would be port dimensions for ported.

best regards
  Reply With Quote
Old 19th November 2011, 12:08 AM   #5
NEO Dan is offline NEO Dan  United States
diyAudio Member
NEO Dan's Avatar
Join Date: Jun 2008
Location: N.E. Ohio
I've been looking - where are the rest of the TSP's for this driver? Looking for SD, LE, BL.
  Reply With Quote
Old 19th November 2011, 02:50 AM   #6
Zero D is offline Zero D  United Kingdom
diyAudio Member
Join Date: Aug 2009
Smile More info etc

@ muddasirwaheedmalik

Hi, i put the TSP's into WinISD & came up with this design, based on ...

Int Vol = 10L

fs = 20Hz

Power = 2000W

1 x Port = D = 140mm L = 223mm


max spl1.gif


@ NEO Dan

I managed to locate the Cerwin Vega Stroker Pro 15 Subwoofer PDF here User Manuals Not exactly straightforward to find they could make the data a LOT easier to find, why they don't ?

I used both HornResponse & WinISD to generate the extra data from the specs in the PDF They correlated quite nicely i'm pleased to say

I inputted Re = 3.6 DCR = Both coils in series

Mmd = 422.10 gm

Mms = 438.2 gm

Sd = 0.0931 m2

Vd = 3.72 L

Cms = 0.0000829 m/N

Rms = 9.32 N/s/m

BL = 18.2 Tm

Le = 1.5 mH
  Reply With Quote
Old 19th November 2011, 09:00 AM   #7
diyAudio Member
Join Date: Aug 2011
The best approach would be to work out how much space you can give to the enclosure and then design the best box for that space. I'd go ported and tuned low, the lower the better for HT and for music-if you tune low you can EQ down the LF for music. Give the space you're willing to sacrifice and I'll give you some designs.
  Reply With Quote
Old 19th November 2011, 09:43 AM   #8
diyAudio Member
Join Date: Jul 2010
vow , thats quite much work you have done. I am a bit surprised about the Bl its a bit low as compared to other similar sized woofers particularly the pro ones.

Any way with 40mm Xmax i think we have quite a room for excursion, at LF. Box size is not issue so i think to avoid thermal and power compresssion at very high levels i would go ported. Again would like to go very very low in tunning , i will be using a pair driven by peavye GPS-2600 amplifier having 900w rms on each channel. So YES big box, PORTED and tuned very low.

SIDE BAR: CAN we add some weight to cone like 440g to reduce Fs by 0.7 factor i.e. Fs=18 Hz , reasons :

1. The sub would be used below 50 Hz only. above 50 Hz i intend to used peavey low rider pro 15 inch driver till 100 Hz.:-)
2. The low end would be extended and i think the motor struture and suspension can take that much extra mass with reduced sensitity we still have 2500 watts thermal power handling capacity to handle the extra power. just a thought
  Reply With Quote
Old 19th November 2011, 01:46 PM   #9
diyAudio Member
Join Date: Jul 2010
Thanks Zero D with 10 L design you have calculated Fs=20 Hz but Baron Groog has said Vented comes up with 11.67cf, F3 13.87Hz, tuned to 15.56Hz.

LETS GO PORTED TUNED LOW. the graph shows reasonable limit within Xmax range. any conseus on design please.
  Reply With Quote
Old 19th November 2011, 01:48 PM   #10
diyAudio Member
Join Date: Jul 2010
looking at the graph above----120 dbs at 20 Hz.......its going to be awesome.
  Reply With Quote


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
Will a Linkwitz transform...transform the driver? AllenB Subwoofers 20 17th May 2010 10:24 PM
search 15 inch Pro subwoofer ? nickthevoice Subwoofers 42 17th April 2008 11:24 AM
Brahma 15 Linkwitz Transform Check Raoul Subwoofers 16 27th April 2005 08:20 PM
15" stroker bottoming out gqfromgp Subwoofers 6 18th February 2005 02:42 PM

New To Site? Need Help?

All times are GMT. The time now is 03:09 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2