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Some questions on the ZOB build... (Read 12412 times)
Damien
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Some questions on the ZOB build...
02/24/11 at 00:46:53
 
One of the user pics seems to show a home built ZOB with felt lining the inside of the entire resonance chamber!?!  Is this as wrong as I think it is? If no felt is used on the inside of the chamber do you paint it or seal it? Polyurethane?

The spikes... attached 'hard' or with felt? My instinct is they should be 'hard' attached

No mention is made in the plans of how you attach the boards to each other. Glue... screws.. brackets? Screws into the end grain of any processed wood is usually not a good solution.

Probably think of three more ?'s as soon as I post this

Thanks
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« Last Edit: 02/24/11 at 01:09:42 by Damien »  

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ZYGI
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Re: Some questions on the ZOB build...
Reply #1 - 02/24/11 at 16:59:23
 
Damien,

Not sure of the picture you write about. If its in the user pictures on the ZOB page, I think that is just a texture Steve used on his renering of the ZOB.

Spikes hard attach with threaded threaded inserts...

Attaching wood together in speakers must be done with joinery. If that isn't possible with the build, with what you have at hand, then screws and glue are a must. To avoid screwing into the edges of MDF you can use pocket screws. the best I have found is the Kreg Jig which should be available from Lowes  Home Improvement. The pocket whole jig takes a bit of practice when you are actually screwing the two pieces of wood together as they tend to slide on one another, the glue acting like a lubricant. There are a few ways to avoid this, but its not that hard to figure out.

Keep the questions coming......

ZYGI
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« Last Edit: 02/24/11 at 17:00:20 by ZYGI »  

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4krow
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Re: Some questions on the ZOB build...
Reply #2 - 02/25/11 at 22:01:53
 
Before I start this project, there are a few questions that I have concerning the cabinet(box). The first would be about the material used for the box( not the baffle). Does it matter as much as in other speakers what material is used? This enclosure is not a pressurized design, and I wonder if the material used affects the sound as in other speakers. I thought that I might use plywood or MEDEX(a type of mdf product but denser). Also, would the thickness of the material be as important? I'm not suggesting a cardboard box Grin, but want to know the limitations of the materials needed.
 Still, I have not seen an answer to the question about lining the box with felt. I see that stuffing has been mentioned, but how much?

Thx in advance for your time.   Greg
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ZYGI
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Re: Some questions on the ZOB build...
Reply #3 - 02/26/11 at 01:49:28
 
Greg,

Medex is as a product name from SierraPine that is just as dense as some of the best MDF out there, the best part its Formaldehyde free and has better moisture resistance than that of normal MDF. I would go with it. We use a very high grade of MDF which is made from pine fibers, which is so far superior to what you could get a Lowes or Home Depot it isn't funny. Medex like what we use has great screw holding strength. WIth that said, I would still use pocket screws for this build.

When we ship, the box has nothing in it. If you listen inside once its built, you will hear nothing but bass with your ear stuck right in the port. You could always (if you make the bottom removable, which I see no other way to attach the baffle) season to taste.

As far as thickness goes, I would stick with the 3/4" as Steve has stated in the plans. If you are using Metric MDF/MEDEX 18mm would be just fine as well.

Hope this helps,
ZYGI
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mike_gagne
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Re: Some questions on the ZOB build...
Reply #4 - 02/27/11 at 22:50:41
 
I agree with ZYGI on the MEDEX. MEDEX is an acronym for exterior mdf as it is water proof (resistant actually) and not as prone to the expansion the lower grades are.
Living in Hawaii, I can use neither and used marine ply with 13 laminations for my HDT build. Worked well.
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Damien
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Re: Some questions on the ZOB build...
Reply #5 - 02/28/11 at 17:27:51
 
Seems medex or even cheap MDF is not an option when your miles from nowhere. No one around here carries it and the nearest city big enough that it might have it is too far away even if I did have a way to haul it. The nearest Lowes or Home Depot is 40 miles. Though I do have a truck it's one of those "I'm afraid to get more than a few miles from home" kinda trucks. My little car could't do the job.

Sigh... Looks like I go with something less than optimal. So I need to coat the interior with a hard smooth finish. Acrylic enamel? Seems to me it would be important not to disrupt the interior of the box with bolt head/ brackets and such. How important is this?

I am thinking hard drying glue with screws and exterior brackets. The entire ext. of the cabinet will be painted a flat black once completed so the brackets will not be seen. That way only the front baffle needs a 'finish'

Thanks for all the advice
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4krow
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Re: Some questions on the ZOB build...
Reply #6 - 02/28/11 at 19:29:10
 
Nowhere is city proper for me. The nearest Home Depot is 98 miles away. And MEDEX, well they just gave me a strange look when I proposed to order some. They did have 9 ply available, but I don't know how that ranks with the other options. I wonder if HDF is good enough.....
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Damien
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Re: Some questions on the ZOB build...
Reply #7 - 03/10/11 at 16:45:09
 
Well I have a rough build on the ZOB's already. Lots of work left to do but they at least hold their own shape now.
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Re: Some questions on the ZOB build...
Reply #8 - 03/10/11 at 22:26:42
 
Your ahead of me. I am just cutting out the baffles today. I am using 1 3/4" cherry. The rest of the build is still forming in my mind. Will probably use a 9 ply  plywood if I can get the quality that is needed. I figure that material can be added to dampen the enclosure if it is too woody or boxy sounding. Wink
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Damien
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Re: Some questions on the ZOB build...
Reply #9 - 03/12/11 at 00:11:16
 
Just curious and you need not answer if you don't want to... but what did that Cherry cost?

I built from the back forward and have not yet looked into a front baffle. I was hoping for Flame Maple or Quilted Maple.... have a look

http://www.mylespaul.com/forums/business-classifieds/34005-great-savings-all-tom...

but I bet that's gonna be huge $$
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Re: Some questions on the ZOB build...
Reply #10 - 03/12/11 at 02:47:50
 
There really is nothing like the beauty of wood. Thanks for sharing the photos. It makes my mouth water.....As I recall, I spent about $80-90 per piece for the lumber. Unfortunately, the shipping was nearly as much! I just got done planing the boards tonight. Cherry is so much more attractive to me after a few years of darkening. I will try to take a picture of them tomm, but I always fail to be able to get pics onto this website, cuz it says that the files are too large. Then when I reduce them, it doesn't like something else about it. I don't remember what anymore. But I could e'mail them to you or something....
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Damien
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Re: Some questions on the ZOB build...
Reply #11 - 03/14/11 at 18:53:23
 
Sure send me some pics  at

damien***at***macgurusdotcom (avoiding the spambots, remove the *'s and fix the dotcom and the at/@)

Here's an interesting tidbit

The hole in the resonance chamber is 3 1/4 inches. Apparently that's not an easily found size for a hole saw. I have 2 lumber companies and 2 hardware stores and a walmart in my smallish town. NONE of them had one. Called Harbor Freight in Indianapolis (50 miles) and they didn't have one. Everyone has 3" and then goes to 3 1/2 inches. Even Amazon, in all it's glory, only carried one 3 1/4" hole saw (other vendors on amazon had only one or two) Here's the link if you have trouble finding one.

http://www.amazon.com/Milwaukee-49-56-0183-4-Inch-Hardened-Hole/dp/B0017WS1EW/re...

Unfortunately I suck at cutting round holes with a jig saw or Reciprocating saw. I have both those tools but I know my limitations  ;)
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Re: Some questions on the ZOB build...
Reply #12 - 03/14/11 at 21:20:09
 
Good to know  'D'.  I wouldn't bet on it, but I either have a 3 1/4 hole saw, or a circle jig for my router that will accomidate.  Now ya have me wondering.....    Btw, I checked out the prices for 17 ply and the 'perfect plank' wood, and even though I think that the prices are fair, they are out of my range.  The ply was $110, and the other was $152, and that still probably wasn't enough board feet...dang! I will have to take a trip to Montana to find anything better than what is available here in Wyo.
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ZYGI
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Re: Some questions on the ZOB build...
Reply #13 - 03/15/11 at 02:32:02
 
Damian,

Here is something that you can use. Should be availible at you local Ace Hardware store.. Doesn't every town have an Ace?

http://www.acehardware.com/product/index.jsp?productId=1292919&kw=circle+cutter&...

ZYGI
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Damien
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Re: Some questions on the ZOB build...
Reply #14 - 03/15/11 at 13:06:00
 
Thanks  and that is something I could have used. I do have an Ace Hardware and did go there.. when I asked for a hole saw and they didn't have the one I needed they didn't suggest this which makes me wonder if they had it. Very small Ace hardware... kind of an afterthought added on to (and completely supported by) the Farm Bureau CO-OP.

Anyway I have already ordered and received the one from Amazon, I cut my holes yesterday.

Now I just need a new Table Saw.... Oh Yeah did I mention I burnt up my table saw on this project? LOL. Yes I did but there is a story about the saw.  It belonged to my dad who kept it in his basement shop. When he passed away I got all the tools but before that there was a flood and the table saw and some other tools got submerged. The Table saw was never the same since. It still worked (very loudly) for light work but 2 sheets of 3/4 board isn't very light. Also it's no great loss because even when it was new (about 30 years ago) it was a very cheap one.  

About the spikes

Are the dimensions on the spikes important. I am assuming they aren't since no mention is made about their size in the ZOB plans. Tall enough to keep the box off the carpet so it can resonate? Pointy so the spikes themselves dampen as little as possible?

Dad's shop was mostly metal working tools and the lathe works just fine. I have a piece of stainless steel stock about 2" or so diameter that I plan to turn these out of
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