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Old 28th July 2014, 08:00 PM   #1
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Default DJK PPSL build

Hello all, my first post and my first cab build in need of some adivce.

The cab has been cnc cut from baltic birch ply to the djk plan cut list found on the web via this site. Drivers will be kappa pro lf 2 as dictated with the cab.

Pic shows mock up now I have sanded the cuts.

I intend to use evostick pva and 4mm x40 screws, should I add baton braces anywhere - I was planning on using them in most areas internally.

I have added a centre support to tne cab - not on the plans - will this have a negative effect?

Looking at the cab I think it need 4 handles in the top part of the cab, is there concensus on making the handles out of the side kf the cab with some layered ply on the inside to make handles seen on most high end cabs, or should I just go with prefab screw in recessed handles?

Should I buy or make a recess plate for the power connectors? I assume to use NL4s.

I intend to finish in warnex paint.

Any help appreciated

Rich, UK
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Old 28th July 2014, 08:41 PM   #2
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Quote:
Originally Posted by sedicirich View Post
1)I intend to use evostick pva and 4mm x40 screws, should I add baton braces anywhere - I was planning on using them in most areas internally. I have added a centre support to tne cab - not on the plans - will this have a negative effect?
2)Looking at the cab I think it need 4 handles in the top part of the cab, is there concensus on making the handles out of the side kf the cab with some layered ply on the inside to make handles seen on most high end cabs, or should I just go with prefab screw in recessed handles?
3)Should I buy or make a recess plate for the power connectors? I assume to use NL4s.
Rich,

1) Unless the battens and bracing reduce the internal volume too much, you can't have too many.
2)Prefab are easier, making your own pocket handles can be better in that they can be made to pick up in any orientation. As far as handle placement, lifting from the bottom or center of a cabinet is a lot easier than lifting from the top.
3) Yes, they tend to get sheared off in transit if not recessed. A plywood board or pre-punched metal sheet can be used behind, or a pocket can be routed in the existing ply.

Art
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Old 29th July 2014, 07:29 AM   #3
djk is offline djk
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The center brace runs down the length of the port, across the back, and up to the front.

I don't need handles, the cabinet will always ride on a two-wheeled cart.

I use Penn-Elcom dual D input cups.

Nice logo work!

Click the image to open in full size.

My latest PPSL, a 27hz quad-12 owned by Norman Bates!
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Old 29th July 2014, 09:42 PM   #4
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Quote:
Originally Posted by djk View Post
The center brace runs down the length of the port, across the back, and up to the front.

I don't need handles, the cabinet will always ride on a two-wheeled cart.

I use Penn-Elcom dual D input cups.


Nice logo work!

Click the image to open in full size.

My latest PPSL, a 27hz quad-12 owned by Norman Bates!
what 12 you used in this box??
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Old 29th July 2014, 11:53 PM   #5
djk is offline djk
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Parts Express 295-120

Dayton Audio ST305-8 12" Series II Woofer
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Old 31st July 2014, 05:56 PM   #6
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Thanks for the replies.

djk, I was reading in the large PPSL thread about reducing plenum slot volume to extend the mid range response. This might be useful to me as I could narrow the slot allowing placement of my handle - which I really need. Also as I am using RCF C3110 it might give me a better crossover to their response? What do you think?

Also what x-over point for this cab/slope(I intend to use a DCX2496)

Does it matter how I mount the drivers, I was going to have both with motors facing up.

I will power them with a Macro tech 2401 - do you think that's big enough?

Best regards

Rich, UK
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Old 1st August 2014, 06:02 PM   #7
scholl is offline scholl  United States
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High JDK,

What is the usable high frequency rolloff and is that box ported?

I'm looking to design a PPSL to go as high as possible to include the "punchy" midbass. Also to mount the design close to the wall\floor junction to take advantage of room boundries and follow in Allisons footsteps.

Thanks!!!
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Old 2nd August 2014, 01:17 AM   #8
djk is offline djk
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"I was reading in the large PPSL thread about reducing plenum slot volume to extend the mid range response"

The main limitation is the depth of the slot, not the width.

"What is the usable high frequency rolloff and is that box ported?"

It's got a slot port at the bottom, about 16" deep.

I have yet to measure the HF response, it should make it to at least 200hz, I'm hoping 300hz. I want to mate it with a Unity/Synergy style HF.
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Old 2nd August 2014, 10:00 PM   #9
freddi is offline freddi  United States
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what happens to performance and response if the plenum is lightly filled with polyfil? are 6th order assisted alignments the best way overall?
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Old 2nd August 2014, 11:41 PM   #10
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Originally Posted by freddi View Post
1)what happens to performance and response if the plenum is lightly filled with polyfil?
2)are 6th order assisted alignments the best way overall?
Hi Freddi,

1) Nothing at sub frequencies.
2) "Best way overall " for what?

Art
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