A Thread for those interested in PPSL enclosures - Page 49 - diyAudio
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Old 8th May 2013, 07:56 PM   #481
Zero D is offline Zero D  United Kingdom
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Join Date: Aug 2009
Quote:
Originally Posted by tinitus

I thought a PPSL was never meant to be isobaric...but that the slot load 'simulates' it ?
Yeah, silly me, reading etc too quickly But the simulate info is new to me, so Thanks for that

Quote:
Originally Posted by tb46

That's the slot for the two drivers,
I got that much, which is why i sketched in approx where the 2 drivers go

Regards
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Old 8th May 2013, 09:41 PM   #482
grecon is offline grecon  United States
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This dual 18" cabinet is my attempt to combine an older idea from DJK in another thread, to his PPSL design in post #115 of this thread. Perhaps I'm not moving forward properly doing this. Anyway, this is what DJK had to say about the W18N8-1000.

"With two FAITAL PRO W18N8-1000 in a 6th order vented alignment you can have a 40hz F3, 104dB/2.83V/1M, in only 4.5 cu ft (net).

Driver Properties
Name: FAITAL PRO W18N8-1000
Type: Standard one-way driver
No. of Drivers = 2
Mounting = Standard
Wiring = Parallel
Fs = 35 Hz
Qms = 10.6
Vas = 211.8 liters
Cms = 0.116 mm/N
Mms = 178.9 g
Rms = 3.712 kg/s
Xmax = 9.5 mm
Xmech = 14.25 mm
P-Dia = 380.3 mm
Sd = 1136 sq.cm
P-Vd = 1.079 liters
Qes = 0.28
Re = 5.4 ohms
Le = 1.8 mH
Z = 8 ohms
BL = 27.55 Tm
Pe = 1000 watts
Qts = 0.273
no = 3.127 %
1-W SPL = 97.1 dB
2.83-V SPL = 98.81 dB
-----------------------------------------
Box Properties
Name:
Type: Vented Box w/ Active HP Filter
Shape: Prism, square
Vb = 4.5 cu.ft
Fb = 40 Hz
QL = 6.716
F3 = 40.65 Hz
Fill = minimal
No. of Vents = 0
Vent shape =
Vent ends =
-----------------------------------------
Active 12 dB/oct. HP Filter
Fx = 40 Hz
Qx = 2

The vent would have to be quite large for full power use, 107 sq in by 30 inches long, perhaps bent like this:

bentport.gif Photo by dkleitsch | Photobucket



With 2KW/4Ω one box should do 134dB at 50hz or so, without exceeding x-max. 3.3Ω minimum at 40hz, 4Ω at 50hz or above.




Edited by _djk_ - 10 July 2011 at 4:51pm
djk
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Old 10th May 2013, 02:50 AM   #483
grecon is offline grecon  United States
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Well the best I can get so far is to make it larger to 27"x32"x22.5" with two ports 4.25"x10.875"x20" and power with 1000w for a port velocity of 19.5m/s.

The new panel sizes are
A 27X32
B 22.5 X 30.5
C 22.5 X 27
D 22.5 X 21
E 22.5 X 7.5
F 22.5 X 9
G 22.5 X 20

http://i1312.photobucket.com/albums/...g?t=1368154161

Please let me know if you see anything that won't work.
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Old 10th May 2013, 04:57 PM   #484
tb46 is offline tb46  United States
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Hi grecon,

The 22.5" outside dimension should be about 24" as you are using 22.5" for the inside board heights.

Here it is in Hornresp (just as a simple BR) w/o the HP filter:

Regards,
Attached Images
File Type: jpg PPSL_Faital_Pro_W18N8_Input.jpg (34.9 KB, 426 views)
File Type: jpg PPSL_Faital_Pro_W18N8_SPL.jpg (29.6 KB, 419 views)
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Last edited by tb46; 10th May 2013 at 05:02 PM.
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Old 10th May 2013, 10:06 PM   #485
grecon is offline grecon  United States
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http://i1312.photobucket.com/albums/...g?t=1368222711


Yes, thanks tb46 the outside dimensions should read 27" x 32" x 24". I'm wondering if I should slide the whole plenum away from the port and perhaps widen the plenum to allow the speakers rear vents to be less constricted.
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Old 11th May 2013, 06:10 PM   #486
tb46 is offline tb46  United States
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Hi grecon,

I would not widen the plenum, on the contrary, I would reduce the opening.

This box will need quite a bit of additional bracing if you want to take advantage of the maximum power capability of these drivers. Added bracing means (obviously) lost volume. A slightly smaller port would not do any harm, and the port length could be reduced depending on the HP filter used.

Also, I for one would be way to clumsy to mount these great drivers securely through the front entry of the plenum.

I'll attach a quick sketch that addresses some of these concerns, others might not find this helpful, so YMMV.

Regards,
Attached Files
File Type: pdf PPSL_plenum_baffle_001.pdf (37.9 KB, 135 views)
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Old 13th May 2013, 02:02 AM   #487
grecon is offline grecon  United States
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Hi tb46,

thanks for the great ideas. I'll look at your changes and see what I can learn from them.

thanks, Greg
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Old 13th May 2013, 05:22 AM   #488
djk is offline djk
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There is little point in making the plenum like that in the rear corners (unless you are trying to go above 250hz or so).

The removable panels for driver loading weaken the cabinet, I made my first pair that way.
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Old 13th May 2013, 11:15 AM   #489
kees52 is offline kees52  Netherlands
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A time ago I did make this for the visaton wsp 26S woofers of 10 inch.

I have never test it but wil do this in future to see how this sounds,
it was for the home, not PA.

I have a friend who does metal music in a band, can you tell me what is best
as bass box PPSL, or Tapped horn or normal horn. I hear good things about the PPSL. He did ask me if I want to build a Bass, I think a sub bas is not needed in a metal band, dut a kicker type of box, from 35 hz and higher.

DRawns are for the visatons two in one PPSL box High pass material wood 1.8 cm thick.

thanks.

kees
Attached Images
File Type: jpg ScreenHunter_02 May. 13 13.17.jpg (218.7 KB, 345 views)
File Type: jpg ppsl.jpg (218.5 KB, 341 views)

Last edited by kees52; 13th May 2013 at 11:38 AM.
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Old 23rd July 2013, 01:24 PM   #490
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Whatever happened to the quad 8 PPSL design DJK?

Was hoping to see pics or more talk of that one. Still want to try a dual 8" sealed or 10" PPSL cabinet someday. Want to see what all the fuss is about.
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