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Old 17th February 2010, 05:04 PM   #1091
brsanko is offline brsanko  United States
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Quote:
Originally Posted by trondareo View Post
Hi Guys,
Here is a I-pod bench I built out of two TangBand W4 bamboos and TQWT calculator on the zillaspeak BiB site They are built of cheap 16mm plywood reinforced with 12mm MDF on the top and bottom. Between the speakers I have built inn a small amplifier I pulled from a pair of computer speakers.
Click the image to open in full size.
So how does it sound?
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Old 17th February 2010, 05:36 PM   #1092
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Well they are very clear and beautiful for jazz and female vocals. The bass is good down to 70Hz but sinks of slowly from the midrange. Soundstage is good. The elements are about 150cm apart and 70 cm above the floor, and I have lightly stuffed the boxes so there is some lower midrange reflecting out of the bass port, which contributes a airyness to the sound.

Before I made them into a bench I used them as ordinary towers, I powered them with a Spud SET amp on the 13em7. With that amp they were beautiful all the way through the spectrum, but a bit strong around 2000-3000Hz which i dropped 5dB with a notch filter. THe cheap computer amp obviously cant provide the same sweet sound the SET had, but is OK.
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Old 17th February 2010, 06:26 PM   #1093
brsanko is offline brsanko  United States
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Well the bench looks very cool!
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Old 20th February 2010, 06:18 AM   #1094
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Default Recent speaker projects

I recently took on tube amp building as a hobby and felt I needed to build some speakers as well. Woodworking is also a hobby of mine so I gave it a shot.

I have built 4 sets of speakers. The first one is a set of small coax bookshelves using vifa drivers from APEX JR. Used the recommended crossover and they sound pretty good for the size.

I then built a set of 2.8 CF full range with Audio Nirvana Super Cast 12. These are big, they have a stained teak veneer. To my ears they sound amazing.

I then found a pair of University drivers at the TRW Swap meet in LA and put them in the recommended size enclosure that came with the drivers (they were brand new from 65 in their box with instructions). I have these in my garage and are unfinished MDF.

Lastly I built a pair of full range speakers using some tiger maple covered doors that someone put in the trash. The drivers are cheap radioshack 40-1909 that i got on ebay for 5 bucks. Took the dustcaps off and put a 3/8 socket with a brass endcap inside as a phase plug. I am using them on a 3.5w homebuilt tube amp and they also sound very decent, plenty loud if desired.
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File Type: jpg VifaCoax.JPG (219.5 KB, 594 views)
File Type: jpg AudioNirvanaSuper12Cast.JPG (188.6 KB, 447 views)
File Type: jpg UniversityMustang12.JPG (178.5 KB, 407 views)
File Type: jpg RadioShack40_1909.JPG (203.6 KB, 432 views)
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Old 20th February 2010, 08:01 AM   #1095
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Good to see we have another addict Good work.

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Old 20th February 2010, 05:10 PM   #1096
brsanko is offline brsanko  United States
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I prettied it up some since the last pic but it's definitely still a bachaoler pad!
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Last edited by brsanko; 20th February 2010 at 05:15 PM.
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Old 20th February 2010, 10:38 PM   #1097
tresch is offline tresch  United States
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A little something new I've been working on!

Made from birch-ply with an inlay of maple. Since the veneer is all pre-applied, this box is entirely miter joints!

This was a challenge! Unlike some of you I /don't/ have a background in woodworking, so I'm learning all this as I go. Lots of planning and trial and error.

This is a first prototype of a design I want to do more with. It's definitely a little rough around the edges, but I think I have most of the problems worked out! The next one should be much cleaner, and come together faster!

Driver: MarkAudio CHR-70
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Old 21st February 2010, 05:25 AM   #1098
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Quote:
Originally Posted by tresch View Post
A little something new I've been working on!

Made from birch-ply with an inlay of maple. Since the veneer is all pre-applied, this box is entirely miter joints!
Looks nice! Can you explain more about the construction? How is the darker stripe there? That's not pre-applied, is it? It's another piece??
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Old 21st February 2010, 06:16 AM   #1099
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The stripe looks like wallnut to me.
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Old 21st February 2010, 05:41 PM   #1100
tresch is offline tresch  United States
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Originally Posted by head_unit View Post
Looks nice! Can you explain more about the construction? How is the darker stripe there? That's not pre-applied, is it? It's another piece??
Sure!

First, the box:
The main material is 1/2 "Birch Ply" which is just MDF sandwiched with Birch veneer. It's inexpensive, but looks decent! Since the veneer is pre-applied, the whole box has to be mitered. I've attached a picture of a test-fit so you can see a bit of how I built it.

One of the trickiest parts was making sure the box was square. This means I had to get the 45degree angle "bevel" pieces exactly the right length, so the front of the speaker is the exact same with, including the bevel, as the back. A little bit 'o Pythagorean theorem gave me the width I needed, then it was just a matter of getting my table saw to make the cut accurately. My fence isn't that accurate, so this involved lots of measuring and re-measuring from the teeth on the blade to the fence with a little 1/32nd inch ruler

The second big challenge was cutting the 45 degree corners on the top and bottom pieces. I can't say I fully succeeded on this. It's a compound miter cut that has to be perfectly accurate and I just didn't have a good enough point of reference to get the depth of the cut right, and I usually overshot it. my solution here is just going to be building a special jig for this.

There's a couple braces in there, and I doubled up the 1/2" ply on the front baffle just to give the speaker more to mount to and to make it a bit more rigid

The inlay: (Oops! yeah it's it's Walnut. Sorry! I don't know why I keep saying maple)
This was pretty simple, actually. The inlay is a 1/4" thick piece of walnut. I cut one piece of the ply down to the width and length needed to eventually make both the front and top pieces, and built myself a ghetto little guide-fence for my router so route out a groove in the ply a specific distance from the edge. Did one groove from each edge then routed out the middle, then cut the walnut down to size so it fit nice and snug (cut a little wide first, then trim down until it's perfect). Glue the inlay in place, then shape the board into the individual panels.

Problems:
This is in bold because I'd like some advice if any of you guys have solved these. There are only two problems that I haven't solved. The main problem that I consistently have with building speakers is accurately drilling the holes for mounting the drivers. I have a good drill press, but I just cannot get them quite perfect, and there always seems to be a bit of tweaking/tension on the driver because one screw isn't quite perfect.

This one came out decently, but not totally perfect, and I drilled the holes WITH THE DRIVER MOUNTED IN THE CAB, which obviously I don't want to normally do. I only did that this time because the driver is my test mule and it's been dropped and is already mildly damaged. Any advice out there on accurately placing holes? making templates, using fences on the drillpress, etc. I just need to try a bunch of stuff.

The other problem is that a bit of glue tends to seep out onto the veneer. Since I'm "clamping" them with tape, some of it seeps under the tape so I can get it off, and it soaks into the veneer and no amount of sanding will remove it. I'm assuming this is going to make the speaker un-stainable. I'm pretty sure I just need to figure out exactly how much glue I need and not use too much, but that will always change based on how tight the angle is, etc. Hmm!
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Last edited by tresch; 21st February 2010 at 05:43 PM.
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