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ZOB active experiment (Read 3734 times)
Kimppe
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ZOB active experiment
12/09/13 at 11:53:04
 
Hello,

I have started a Zen Open Baffle experiment. I'm doing it somewhat different so I thought some of you might find it interesting.

I'm really hoping you will comment what I am doing!
It seems I need to post five text only messages before I can post links to pictures or manuals and datasheets. I'll put them up when I am able.

I am building active ZOBs. I have a Hypex AS2.100 plate-amp going into the left ZOB and then Hypex DS1.2 Sub plate-amp going into the right ZOB. (this might change still).

The AS2.100 has both digital and analogue input (usb/spdif/RCA). It has a computer interface via usb that lets the user filter the signals going to two channels plus one subwoofer.

The drivers I have are SEAS FA22RCZ full-range 8" elements.

When I was surfing the web i came across the Zen Open Baffle and I really find the idea and design interesting. So I have started the project of making the cabinets.
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« Last Edit: 12/09/13 at 11:54:34 by Kimppe »  
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Lonely Raven
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Re: ZOB active experiment
Reply #1 - 12/09/13 at 22:11:54
 
I'm looking forward to seeing what you build - I love watching DIY projects.

What wood are you using?
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Kimppe
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Re: ZOB active experiment
Reply #2 - 12/10/13 at 06:55:30
 
The wood is particle board (720 kg/m3).
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Kimppe
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Re: ZOB active experiment
Reply #3 - 12/10/13 at 06:57:04
 
The cutted edges will need some filling and then I'll paint everything but the front panel black.
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Kimppe
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Re: ZOB active experiment
Reply #4 - 12/10/13 at 06:58:27
 
The front panel will be veneered, but I have not yet decided what wood to use for that.
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Kimppe
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Re: ZOB active experiment
Reply #5 - 12/10/13 at 07:02:29
 
I was thinking that Walnut would be nice. I have the rest of my equipment and also the television in a Cabinet made of some similar wood.

But we have plenty of birch growing here in Finland and birch veneer would probably be considered more local design....
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Kimppe
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Re: ZOB active experiment
Reply #6 - 12/10/13 at 08:29:43
 
My OB experiment that I am turning into ZOBs looks like this now:


The first ZOB is coming along nicely:

made by Calle Smiley

and
http://www.berlins.fi/zob/2.jpg

The manuals for the amplifiers are here:
http://www.berlins.fi/zob/Manual_AS2.100_R5.pdf
and
http://www.berlins.fi/zob/DS12_manual.pdf
and the datasheet for the 8" element:
http://www.berlins.fi/zob/H1597-08_FA22RCZ_Datasheet.pdf
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Lonely Raven
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Re: ZOB active experiment
Reply #7 - 12/10/13 at 15:30:32
 

Is that particle board going to be solid enough?

The shape looks nice, I like the start!

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4krow
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Re: ZOB active experiment
Reply #8 - 12/10/13 at 23:08:24
 
I always applaud experimentation, at least in non-nuclear hobbies. Anyway, I too, will be conducting a couple of new experiments with the ZOB involving BSC and treble correction. The treble correction is really more about me and my hearing, but the Baffle Step Correction will be an experiment as to what might accomplished for the low end of this design. Having said that, I presently use a sub woofer along with this design, and find that the must be barely turned up(2-4 out of 50! of the Velodyne SMS-1). Never being less than curious, I want to try and let this speaker system do it 'all by itself'. The circuitry has been ordered, but will not arrive for some time. I will post at a later date to keep in touch.
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Decware 34I.3 integrated amp/Forte' 3 bass amp/Velodyne SMS-1 bass mngmnt system/Decware ZOB speakers/BESL subs/Emotiva ERC3 CD player/BPT 3.0 power cond. PS Audio P500
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Kimppe
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Re: ZOB active experiment
Reply #9 - 12/11/13 at 06:55:19
 
The reason for choosing particle board here were economical.
One sheet of MDF would not have been enough and this particular particle board came in a more manageable size (600 x 2000 x 22 mm).

I don not know if the particle board is solid enough. Do you think that it might break at the weak point where the tuning slot is?  

I understand that MDF is often preferred by speaker builders.
It is considered a "dead" material. I'm not experienced enough to
know what that actually means but I have thought that it would mean that it resonates at lower frequencies due to higher mass (density) than other available materials.
 The particleboard I use here has a density of 720 kg/m3 and MDF is according to wikipedia 600-800 kg/m3, so no difference there...
 And as I understand it the most effective way of reducing resonance of the cabinet is by adding bracing to shorten the resonating "springs" in the construction.
 This has led me to the conclusion that MDF is preferred mainly since less work is needed to get a nice finish of the cutted edges.

Birch plywood is ofcource nice and also more costly.
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« Last Edit: 12/11/13 at 08:49:24 by Kimppe »  
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Lonely Raven
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Re: ZOB active experiment
Reply #10 - 12/11/13 at 18:20:00
 
Quote:
know what that actually means but I have thought that it would mean that it resonates at lower frequencies due to higher mass (density) than other available materials.


Sounds like you understand it perfectly. If they used a lot of binder in that particle board, it could be dense and durable enough. It just looks too much like the Ikea stuff that falls apart.  :)

Your workmanship looks excellent, and it's not like your hanging 18" woofers off of it, so you'll probably be fine!
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Kimppe
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Re: ZOB active experiment
Reply #11 - 12/24/13 at 10:09:47
 
The front panels are taking shape.
They consist of the same 22 mm particle board and another less dense (ordinary IKEA quality Smiley ) 12 mm particle board glued together. They are veneered with oak veneer and then there is a 10 mm strip of oak around the edges.

From the front:


From the back:


And the hole from the front:


The hole from the back:


The edges:


Now some sanding and then I think I'll apply oil or wax to the surface.
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« Last Edit: 12/24/13 at 10:13:57 by Kimppe »  
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Lonely Raven
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Re: ZOB active experiment
Reply #12 - 12/24/13 at 22:20:41
 

Nice clean work!
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Kimppe
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Re: ZOB active experiment
Reply #13 - 08/15/14 at 22:35:07
 
It's taken awhile but they are starting to look right
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image_012.jpg
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Kimppe
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Re: ZOB active experiment
Reply #14 - 08/15/14 at 22:38:34
 
Another picture
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image_013.jpg
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