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Old 5th September 2002, 05:19 PM   #1
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Question How to construct grills?

I have been working on a pair of speakers off and on for a while now, but am unsure how to do this one aspect. What is the best or easiest way to make the front cloth grill for DIY speakers? While this has been touched on in earlier threads, there is not thread dedicated to this specialty task. Building a solid and beautiful wood box is discussed in many books, but try as I might, I have not found a reference to speaker grill construction.

Thank you,

Craig
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Old 5th September 2002, 05:23 PM   #2
BrianGT is offline BrianGT  United States
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I would make a cutout of the desired size of your grill out of 1/2" mdf, and staple or glue grill cloth to it, which you can get from Parts Express. They also sell things to easily hold the grills onto your speakers. I would put up some links, but I can't seem to access their site at this time.

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Old 5th September 2002, 05:27 PM   #3
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In cutting out the holes at the driver locations which is better?

1. Bevelled edge away from driver

2. Quarter round edge away from driver

3. Half round edge?

What type of glue works best for bonding the grill cloth to the MDF?

Thanks,

Craig
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Old 5th September 2002, 05:35 PM   #4
BrianGT is offline BrianGT  United States
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I was planning on keeping the mdf part of the front grill as far away from the drivers as possible, and just using it as the outside frame for the grill and the inside part of the frame being empty.

As for routing, I was just going to leave square edges, since it is not too close to the drivers. My plan was to cut the mdf to size, and paint it black, and staple the grill material to it.

Now, I am thinking of just skipping the grills, since i love the look of the drivers, and the wood. The only real reason that I wanted to have the grills, was for the protection of woofers from those who like to poke at them, especially at parties.

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Old 5th September 2002, 05:42 PM   #5
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Here's a little trick I found works well.
Once you have your baffle cut and finished (eg, with edges and corners rounded, or whatever you choos) apply the cloth as follows:

Stretch the grill cloth out on a large table and tape it down with duct tape such that it has some tension.

Spray the front side, edges, and part of the back, with some aggresive 3M spray-on adhesive (I can't remember the adhesive number right now, maybe 99 ?- Home Depot sells a couple different ones)

Wait a couple minutes for the adhesive to get tacky.

Press the grill onto the cloth and then undo the tape holding the cloth one piece at a thime while wrapping the cloth around the edges and pressing onto the back of the grill.

Once it dries you can cut away the excess cloth with a razor knife.

The key is using the right adhesive. Some will not stick to cloth well but the one I used works great. Sorry, I will have to post the adhesive number later....

hope this helps, -Brad-
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Old 5th September 2002, 05:54 PM   #6
BrianGT is offline BrianGT  United States
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Parts Express Links:

Grill Cloth
Grill Guides

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Old 5th September 2002, 08:35 PM   #7
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If you've taken pains to minimize diffraction by flush mounting the speakers and rounding the enclosure edges, it (and more) will all go out the window with the proposed 1/2" MDF gill solution.

Why don't you post a pic and see who can come up with the best grill?
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Old 5th September 2002, 09:26 PM   #8
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Default Why don't you post a pic and see who can come up with the best grill?

Although I made grills traditional way I still find this one the easiest to do and in certain designs the best looking grill.

If you notice pieces of black foam on top and bottom cabinet, believe it or not but their presence is detectable by ear.
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Old 5th September 2002, 09:29 PM   #9
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It's made out of window air conditioner filter and attached to the speaker with velcro. It only slightly tames high frequencies and for not serious listening it is negligible. Kinda Wilson style.
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Old 5th September 2002, 09:50 PM   #10
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I like the air filter idea, it brought a smile to my face. I must confess though I don't know how my wife, nor my todler for that matter, would take to it. On second thought, my todler son might like it a lot as it would be nice and soft...

Back to the question 3 posts up. I actually didn't go to the trouble of flush mounting the drivers. It is all part of the saga. I picked up some drivers and crossover components from madisound on clearance 4-5 years back on a wim. After leaving them sit for a year or so, I started working on the enclosure. No table saw, everything cut with a circular saw. This was before I learned the usefulness of clamps and a nice straight guide... Needless to say, I had a lot of sanding to do to get a tight fit. So, months later, I finally have a MDF box. With no router on hand while cutting the original panels, I of course did not counter sink the driver holes. Once the box was assembled, I realized that I could see the seams from my but joints a little too much. I tried wood filler but that did not sand as easily as the MDF edge and made things worse. Finally used plaster and that worked well. Now I had to decide on finish. At the time, I did not realize how easy it was to find veneer and though I would paint them flat black and then coat with way too many layers of urethane. It is amazing how little imperfections are highlighted by this selection of finishes. Needless to say, I have wanted to scrap this project many times. But, if I did that, how would I be able to get my wife to allow me to build a set of Adire 281 TL speakers now that I have done far more work on wood etc. and would have a more successful and enjoyable time. So, I have a 20" x 12" front baffle, with non-flush mounted tweeter and 8" driver, that needs to be covered with a grill that will make these speakers look presentable and salvage this project so that I can move on hopefully having learned some stuff in the process. At this point, I don't care if they even sound terrible, which they likely might. I can overcome that obstacle in negotiations. I just need to show that I can make them look nice in the end. So, how do I get a professional looking front grill that won't completely destroy the effort I tried to put into designing of the enclosure and crossover.

If the 1/2" MDF with beveled edge won't work what will? I had thought of using a accoustical ceiling tile in place of the MDF as it will not have the reflection problem, but the ceiling tile is difficult to get a nice edge on. Other ideas?

Craig
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