A Thread for those interested in PPSL enclosures - Page 44 - 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 14th February 2013, 06:10 PM   #431
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
Quote:
Originally Posted by epa View Post
its diffecult to get this driver to play low.
250 lts tuned at 20 hz .not verry small
if you punch the numbers from in the input screen,you cam play with the wizzard yourself.
click on the pic left bottom x to enlarge pic.
Click the image to open in full size.
Thanks , I had also that same idea, a normal vented box was already 200 plus liters. but if I halve the vas then it get smaller, like a isobaric way and go low, but that is not a ppsl anymore.

high Sd and smaller VAS will work oke here.

thanks for your attemt I go play. the output on hornresp is good, 250 liters is big but if one box used, the rest is ob then it is oke, it has
good output I see.

How have I to involve the S1 S2 S3 in the box itself (misschien kan je dat even mailen via hier in nederlands, dank je alvast), and the slot? how do it act as we mass load the cones like in the ripole, I think that we then have to experiment with it, a slot who has the conus face each other, magnets in the box..



The peak at 200 plus hz can be easely cope with, to use a euhh zuigkring.

photo is the slot I did make for measuring.

Last edited by kees52; 14th February 2013 at 06:18 PM.
  Reply With Quote
Old 14th February 2013, 06:15 PM   #432
Juhazi is offline Juhazi  Finland
diyAudio Member
 
Juhazi's Avatar
 
Join Date: Mar 2007
Location: Jyväskylä
My own project evolved towards PPSL too A bench style cabinet subwoofer 2x15 closed

It is in hiatus stage because I must wait for the drivers. I have been waiting for 9 weeks now. I got tired of making more sims...
__________________
AES Associate Member / My DIY speaker history: -74 Philips 3-way, -82 Hifi 85B, -07 Zaph L18, XLS10+PR/Hypex, -08 CSS125FR, -08 Hifitalo AW-7, -08 TangBand FR, -09 MarkK ER18DXT, -13 PPSL470, -13 AINOgradient
  Reply With Quote
Old 14th February 2013, 06:35 PM   #433
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
Quote:
Originally Posted by epa View Post
its diffecult to get this driver to play low.
250 lts tuned at 20 hz .not verry small
if you punch the numbers from in the input screen,you cam play with the wizzard yourself.
click on the pic left bottom x to enlarge pic.
Click the image to open in full size.
Thanks , I had also that same idea, a normal vented box was already 200 plus liters. but if I halve the vas then it get smaller, like a isobaric way and go low, but that is not a ppsl anymore.

high Sd and smaller VAS will work oke here.

thanks for your attemt I go play.

photo is the slot I did make for measuring.
Attached Images
File Type: jpg fill in.jpg (66.1 KB, 270 views)
File Type: jpg test-ppsl.jpg (50.8 KB, 250 views)

Last edited by kees52; 14th February 2013 at 06:40 PM.
  Reply With Quote
Old 14th February 2013, 06:39 PM   #434
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
Hi Epa

I have fill in the hornresp, I get lower spl, and I have change the VRC to 150 and get this,
not 20 hz without loss but 25 hz - 1 dB is there what is most of the time enough I think.

Afcourse if i did it the right way, your simulation is 95 dB?? did I something wrong.

the vrc is 150 I have lowered that after the test for as you see it and think this is the problem, maybe I have a old version of hornresp it is 21.30

thanks
Attached Images
File Type: jpg test-ppsl.jpg (50.8 KB, 251 views)
File Type: jpg fill in.jpg (66.1 KB, 25 views)
  Reply With Quote
Old 14th February 2013, 08:47 PM   #435
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
How have I connect the speakers in a ppsl box, in fase or out fase. I have test the slot the woofers go from 19 hz to 29 hz in it, when as a ripole it go from 29 to 22 hz.

I measure with limp and use the output of the audio card I think I need a 10 watt amp for it to do good.


thanks
  Reply With Quote
Old 15th February 2013, 07:37 AM   #436
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
That's odd, the Fs usually goes down a very small amount (I just ignore any change).
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 15th February 2013, 10:27 AM   #437
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
Quote:
Originally Posted by djk View Post
That's odd, the Fs usually goes down a very small amount (I just ignore any change).
maybe because it is open, it go down if complete box on it, but the speakers have already natural 19 hz Fs. or in a ripole I need to make it complete ripolo before that work.
  Reply With Quote
Old 15th February 2013, 10:39 AM   #438
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
If you check several identical drivers the parameters will be all over the place.

However:

The (Qts^2)*Vas will generally be constant, as well as the Fs/Qts product.
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 15th February 2013, 11:44 AM   #439
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
There are a lot of interesting speakers for OB special the car woofers who have nice qts of 0.59 like this one.



Google Afbeeldingen resultaat voor http://www.pdfjungle.com/images/MTX-Audio-Portable-Speaker-Specifications-Sheet-for-MTX-Audio-RoadThunder-RT15-04-Portable-Speaker-PDF-Preview.png
  Reply With Quote
Old 16th February 2013, 08:35 PM   #440
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
Ohh ahh I had a old version of hornresp 21.30 the new one is give other results but not wht epa has, so what is wrong, and how do i interpret hornresp in a PPSL box.

Is it not better use a speaker with a lower vas? then the box will be smaller. it is quite big with this woofers, and I need two for a ppsl.

thanks.
  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
PVC pipe enclosures with flat wood baffles - yet another dumb Spasticteapot thread. Spasticteapot Multi-Way 3 8th January 2007 05:35 AM
Might be interested in this distortion thread mashaffer Tubes / Valves 9 14th July 2004 01:08 PM
Interested ??? P901 Multi-Way 1 3rd December 2003 03:37 AM


New To Site? Need Help?

All times are GMT. The time now is 08:17 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