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Old 23rd November 2012, 01:55 PM   #31
Juhazi is offline Juhazi  Finland
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Hello Houston, the Project has been launched!

Just visited a carpenter and hardware store. The sides will be made of 21mm spruce plywood and the cover is a wenge-laminated LDF board, 40mm thick. Plywood will be cut to precise sheets for assembly, I will cut internal braces myself. I'll get the parts some time next week. The front panel might be a sandwich structure, insulation wool and a mdf board. Finally dark blue wallpaper glued onto it, like all walls of this home theater room.

The bench will be born quite soon but the ppsl sub some time next year.

Thank you all, specially "Norman" and Oliver

Juha
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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

Last edited by Juhazi; 23rd November 2012 at 02:20 PM.
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Old 24th November 2012, 10:40 AM   #32
Juhazi is offline Juhazi  Finland
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Default PPSL 518 picture

New and better sketches of my ppsl 518L sub and my theater room. The curtain rod is actually a 100" screen.
Attached Images
File Type: png ppsl 518 2xDayton 15 complex.png (24.5 KB, 274 views)
File Type: png ppsl 518 2xDayton 15 complete.png (17.0 KB, 276 views)
File Type: jpg teattterihuone ppsl518.jpg (135.6 KB, 272 views)
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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
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Old 27th November 2012, 07:26 PM   #33
Juhazi is offline Juhazi  Finland
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Knock on Wood

Some knuckle knock test i made. Later on I'll post also measurements of finished cabinet walls.

Method:
sheet of board held hanging in air with fingers
Microphone 10cm from the board on the opposite side of knock (knuckle)
Apparatus Zoom Q3, hardware 2.01, Gain L, 24/96000Hz wav-format
Analysis Audacity 2.0.0 Windows 7 64-bit (program 32-bit)

Sorry, the graphs are no in same scale -look at the form of graphs.

Spruce plywood 21mm 42x104cm (the 50hz humming is room mode making the board resonate! I tested aurally in different rooms)
Spruce plywood 31mm 60x40cm (microphone gain H, clipping at knock)
MDF 25mm 40x85cm
Attached Images
File Type: png sply 21mm 42x104cm spektri.png (161.1 KB, 251 views)
File Type: png sply 21mm 42x104cm std autocorr.png (143.6 KB, 228 views)
File Type: png sply 21mm 40x60 spektri.png (209.7 KB, 32 views)
File Type: png sply 21mm 40x60cm std autocorr.png (196.2 KB, 26 views)
File Type: png mdf 25mm 40x85cm spektri.png (130.6 KB, 28 views)
File Type: png mdf 25mm 40x85cm std autocorr.png (132.6 KB, 30 views)
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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

Last edited by Juhazi; 27th November 2012 at 07:45 PM.
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Old 28th November 2012, 04:59 PM   #34
Juhazi is offline Juhazi  Finland
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Boxes starting to build up. Just five outer walls put together. The weather is freezing now finally so I must work inside.
Attached Images
File Type: jpg Sub boxes.jpg (192.5 KB, 141 views)
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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
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Old 28th November 2012, 08:04 PM   #35
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back in my day, we trusted our ears.
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Old 29th November 2012, 12:06 AM   #36
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That would have been the 20th century. Now trust is passe. We must trust the meters. Sorry, I meant monitors. Sims not sound. Alriteythen...
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Old 29th November 2012, 05:22 AM   #37
Juhazi is offline Juhazi  Finland
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Guys, I did the knock measurements inspired by the Harbeth speaker discussion.

I had already decided the cabinet material for my subs. The general design was inspired by the space and location available. Also closed box was a prejudice. Then I had to find drivers for cabs and I did Unibox and WinISD simulation to see what was well expected. The slot idea came after that. And because I can't use Hornresp, and seems like ppsl is not well documented, it's interesting to see how it measures.
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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
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Old 29th November 2012, 07:57 AM   #38
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lol, all is good.
I'm sure it will sound great.
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Old 20th December 2012, 05:53 PM   #39
Juhazi is offline Juhazi  Finland
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Some progress before the holidays. Cabinets are ready but the drivers are missing. A Hypex DS2.0 will deliver the power with eq and adjustable phase.

You can see my lovely carpenter givng the strategic inner structures the finishing touch.

The cabinets with wallpaper coating and the cover. You can also see some of my multiple bass traps and the minute JBL 10" sub.

Happy Christmas!
Attached Images
File Type: jpg inside.jpg (123.2 KB, 139 views)
File Type: jpg 2012-12-20 20-38-05.111.jpg (189.9 KB, 137 views)
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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

Last edited by Juhazi; 20th December 2012 at 05:59 PM.
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Old 21st December 2012, 01:21 AM   #40
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The drivers are going to be sharing the box air, right ?
were you using a pipe to couple them together ?

Click the image to open in full size.

what driver were you using again ?
Qts, vas, Fs ??????

And how big a sealed box do you have ?

Norman
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