A Thread for those interested in PPSL enclosures - Page 42 - 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 13th February 2013, 04:59 AM   #411
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
How would something like this fair for a PPSL tapped horn?

Click the image to open in full size.


Thinking about putting a pair of Cerwin-Vega Stroker 12s in a tapped horn.

Last edited by OscarS; 13th February 2013 at 05:08 AM.
  Reply With Quote
Old 13th February 2013, 12:50 PM   #412
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
A tapped horn has already a mass load on the speaker and go very low, i don,t think it give you extra advantage with a plenum in it.
  Reply With Quote
Old 13th February 2013, 03:26 PM   #413
epa is offline epa  Netherlands
diyAudio Member
 
Join Date: Apr 2010
Location: amsterdam
Quote:
Originally Posted by OscarS View Post
How would something like this fair for a PPSL tapped horn?

Click the image to open in full size.


Thinking about putting a pair of Cerwin-Vega Stroker 12s in a tapped horn.
when our the cnc router arives (6 weeks or so)
then were gona bild this
we are also going to flip one driver to see what hapens.


Click the image to open in full size.
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db

Last edited by epa; 13th February 2013 at 03:28 PM.
  Reply With Quote
Old 13th February 2013, 04:40 PM   #414
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
it looks like a slot loaded dual tapped horn, interesting I am curieus about its capabillitys, nice professional look also, well drawn but big? and for PA?.

I have some question need the plenum be open on both sides? I see I can see trough the plenum with a PPSL.

I now now how to design, just simulate a normal vented box and make the advised volume greater with the total cm2 of the plenum, so a box of 100 liter with a plenum of 5 liter will give total of 105 liters.

Only, the plunem makes that the FS drops, and so I have to measure the parameters of the two spekaers first in the plenum alone then calculate the total vented box around it, I did see the plenum is in de middle of the box but I think is not so critical.

the plenum has only big enough to fit the speakers?

now I have enough info for trying to make with box pro.

thanks
  Reply With Quote
Old 13th February 2013, 05:51 PM   #415
epa is offline epa  Netherlands
diyAudio Member
 
Join Date: Apr 2010
Location: amsterdam
plenum only open to the frontside.
i'm not sure why the fs should drop.
best is to simulate it in hr,it is pretty acurate.
the plenum needs to be half of the total sd for pa speakers.
and yes you wil need the driver to sqeeze trough it.
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db
  Reply With Quote
Old 13th February 2013, 06:50 PM   #416
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by kees52 View Post
A tapped horn has already a mass load on the speaker and go very low, i don,t think it give you extra advantage with a plenum in it.
Going "lower" wasn't an objective, anyone who has modeled tapped horns can play with the line length to get a lower F3---I was thinking about incorporating the PPSL plenum in order to hopefully drop the distortion levels on a speaker that has no anti-distortion mechanism what so ever.
  Reply With Quote
Old 13th February 2013, 07:26 PM   #417
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
@epa

You are right, with tight you mean the speakers has to be build in without opening the box, just enough to squeeze them trough the plenum?

I have visaton 10 inches with xmax 12 mm and fs of 19 hz, that the fs drops have I from the ripole/dipole idea from linkwitz now I think the ripole drops fs because the frond and the back of the woofer cone will be mass loaded, the normal dipole only loaded on one side of the cone.

Have you some example how to use hornresp for it? do it only simulate the plenum s1, s2 and s3 and s4? and the box itselfs and the pipe length is lpt etc.

I had not good look to the plenum so I tought it was open it was not.

@oscar well try it, I can not say what it will do, sound is very difficult to predict, I was suprised by that and how much but tapped horns has already more spl watt and so lower distortion
an good woofer with heavy cone and motor and big xmax will already be low distortion when listen normally, for PA yes it give more but still low compare to normal pa systems without horns.

thanks all

Last edited by kees52; 13th February 2013 at 07:30 PM.
  Reply With Quote
Old 13th February 2013, 07:38 PM   #418
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by OscarS View Post
I was thinking about incorporating the PPSL plenum in order to hopefully drop the distortion levels on a speaker that has no anti-distortion mechanism what so ever.
Oscar,

DSL's TH-812 uses an in-line PP loading that probably would work better than the plenum you suggested.
Even if it did not work better, it would be a lot easier to build.
  Reply With Quote
Old 13th February 2013, 08:55 PM   #419
epa is offline epa  Netherlands
diyAudio Member
 
Join Date: Apr 2010
Location: amsterdam
maybe this helps
Click the image to open in full size.
just an example
Click the image to open in full size.
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db
  Reply With Quote
Old 13th February 2013, 09:12 PM   #420
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
I have the wsp 26s woofers I did want to build this box for home theatre, but always I get to long pipes, because the woofers has low FS of 19 hz, but do the slot trow down the speaker fs and rise the qts yes or no, because some people way it stays the same, I have then need to measure in a slot alone to see what happens, or we make a small slot facing the speakers like in a ripole and look what happens.

the thiele small of this speakers.

maybe you can try them for me in HR, thanks, nut the box get really big, I do use basbox pro to test a normal vented box, and it go low but so long a pipe..

Rated power 110 Watt
Maximum power 140 Watt
Nominal impedance Z 8 Ohm
Frequency response fc - 7000 Hz
Mean sound pressure level 91 dB (1 W/1 m)
Excursion limit 22 mm
Resonance frequency fs 19 Hz
Magnetic induction 1 Tesla
Magnetic flux 1250 Weber
Height of front pole-plate 8 mm
Voice coil diameter 5 cm
Height of winding 1,45 cm
Cutout diameter 23,3 cm
Net weight 2,5 kg
D.C. resistance Rdc 5,7 Ohm
Mechanical Q factor Qms 3,19
Electrical Q factor Qes 0,38
Total Q factor Qts 0,34
Equivalent volume Vas 230 l
Effective piston area Sd 330 cm2
Dynamically moved mass Mms 42 g
Force factor Bxl 8,7 T m
Inductance of the voice coil L 1,2 mH
  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 06:35 AM
Might be interested in this distortion thread mashaffer Tubes / Valves 9 14th July 2004 02:08 PM
Interested ??? P901 Multi-Way 1 3rd December 2003 04:37 AM


New To Site? Need Help?

All times are GMT. The time now is 10:14 AM.


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