BFM TLAH construction with CNC router help - AVS Forum
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post #1 of 49 Old 05-27-2010, 11:24 AM - Thread Starter
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These are in preparation for my basement HT project that I'll start hopefully soon. My plan is to have TLAHs for LCRs and maybe for surrounds using less drivers. THT for the low end of course.

I have the plans for the Bill Fitzmaurice TLAH and THT. I've been working on my wife's attic project for the last year and couldn't stand it any longer. I finally built something.

I CNC'ed the LCR baffles and side pieces, but you could easily use a jigsaw.

 




The rest was cut on the table saw. The build is really quick with an air brad nailer and the polyurethane glue. There are only 5 pieces of wood, but a bit of wiring with all of the drivers. I decided on eight JVC 3x5s and six 1016 piezos so the total for each box is $22! I'm told the piezos need EQing, which I do agree with. Hopefully I'll have a receiver with Audyssey soon.

I started this am and have one functioning speaker already. I could have another couple in 2 more hours, but I'll do that in a day or two.

Oh, and it sounds pretty nice! I'm not an expert, but I don't think you can beat it for the price. I get good output at about 1/10 with just one, so all three at max would be hearing damage levels.


Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #2 of 49 Old 05-27-2010, 11:40 AM - Thread Starter
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Here's another video for fun
 


Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #3 of 49 Old 05-27-2010, 12:48 PM
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Man I wish I could get a CNC router setup.
Thanks for the cool videos.
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post #4 of 49 Old 05-27-2010, 12:53 PM
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wow! if that is something you have at home, i have to say damn! wished i had a cnc router.
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post #5 of 49 Old 05-27-2010, 01:12 PM
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OMG , A CNC in a home shop = drool

If at first you dont succeed , get a bigger hammer !
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post #6 of 49 Old 05-27-2010, 02:33 PM
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haha very nice. that would definitely be an improvement over my shakey hands when cutting out the baffle for the SLA... Let me know if you need a hand, I'd like to see them when they're done.
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post #7 of 49 Old 05-27-2010, 03:17 PM - Thread Starter
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The CNC is actually at my workshop (about 10 minutes from my house). I used to make CNC RC planes with it. I will be moving it to my garage hopefully in the next few months.

Oh, and I built that CNC with only 800-1000 hours of work!

For most things, doing it by hand is quicker. It took me about 1 hour to setup the programming for the CNC. It takes maybe 3.5 minutes to cut each piece. I only did it this way because I'm thinking I might do the same thing for the surrounds with maybe 4 of each driver.

Brad, these things are so easy to put together, it's ridiculous. If you want a set, let me know and you can watch me CNC them. Also let me know if you want to listen to them once I have the second one made.

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #8 of 49 Old 05-27-2010, 05:06 PM - Thread Starter
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One more video making tapered sides.


Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #9 of 49 Old 05-27-2010, 06:10 PM
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nice. I have 2 TLAHs,6 SLAs and a THT running now.
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post #10 of 49 Old 05-27-2010, 10:08 PM
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Wow, that router easily moves 4x faster than I do! I move slow when making my cuts.

YID DIY
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post #11 of 49 Old 05-28-2010, 01:51 AM
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Badass!!
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post #12 of 49 Old 05-28-2010, 01:54 AM
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Did you use these plans? http://buildyourcnc.com/default.aspx
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post #13 of 49 Old 05-28-2010, 05:43 AM - Thread Starter
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Quote:
Originally Posted by snickel View Post

nice. I have 2 TLAHs,6 SLAs and a THT running now.

I can't wait to make a THT (even more so after hearing bbowers'). Unfortunately the room I'm in right now is pretty small. That, and since it isn't sound isolated I would definitely disturb our neighbors. I'm sure I could get the THT built in a weekend. Having said all that, I'll probably build it sooner than later.

I had both TLAHs built and running as of last night. They sound great! I'm getting a mic from a friend so I can run REW so I can get the freq response tuned a little better. I used sine waves to tune the system by ear.

Looneybomber: the machine runs really fast. I've cut 4x that fast with this CNC! No need to with non-production work.

jleonard711: I used a lot of info from CNCzone.com. I designed it myself based on what I would be making (RC slope wings) and what parts I could source. That CNC you linked to looks cool. I'm sure that website wasn't up when I built my CNC. I don't know if you can tell, but the machine I made is welded steel -- very strong and 600+lbs. I can cut 78" x 26" x 12". It rapids at 1200 IPM and I have cut at 800 IPM. I'm using 1 HP servos on all axes.

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #14 of 49 Old 05-28-2010, 06:36 AM - Thread Starter
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Here's one of them (I still have to screw on the back) along with the twisted neck bass I made on the CNC and my projector on the wall. I'm not planning on painting/staining the TLAHs since the will eventually be hidden in my dedicated HT.


Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #15 of 49 Old 05-28-2010, 09:38 AM
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wow well done...that whole set up is seeexy haha!! how many are you building all together?? I think you should build an extra three and Ill drive up and buy em

Your going to love th THT with those too...they are pretty insane...great work!
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post #16 of 49 Old 05-28-2010, 09:58 AM - Thread Starter
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Quote:
Originally Posted by mdk2007 View Post

wow well done...that whole set up is seeexy haha!! how many are you building all together?? I think you should build an extra three and Ill drive up and buy em

Your going to love th THT with those too...they are pretty insane...great work!

Thanks!

I'm building 3 for the fronts. I think I might make 4 for surrounds, but with 4 woofers and 4 tweets (as opposed to 8 and 6 for the fronts). I made the fronts 51" long to fit all of the drivers, but I'd go to 40" for the surrounds. I may also try to make them a little slimmer so I can make them flush with any wall treatments I put in the room so I can hide them.

I see you built TWO THTs! I heard one at 1/4 volume in an unenclosed room and it was moving the floor.

I'd love to CNC dados into the sides of the THT, but it is too large for my machine. Actually, I could do that with the low profile version. I think the build will be easy enough.

By the time you figure in driving time you could just build them yourself! Wiring them takes longer than anything else, and that's only maybe an hour per.

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #17 of 49 Old 05-29-2010, 05:14 AM - Thread Starter
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My wife's cousin is over at our house and demoed the TLAHs for him. He said it was the most amazing sound he's ever heard. The sound really is so clear/clean and as loud as I can stand without distortion.

This was a really worthwhile project for less than a day's work and at $25 a speaker!

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #18 of 49 Old 05-29-2010, 06:09 AM
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Yep they sound great and are cheap here are my SLAs
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post #19 of 49 Old 05-29-2010, 07:22 AM
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Quote:
Originally Posted by AndreasMergner View Post

Here's one of them (I still have to screw on the back) along with the twisted neck bass I made on the CNC and my projector on the wall. I'm not planning on painting/staining the TLAHs since the will eventually be hidden in my dedicated HT.


You gotta straighten up those drivers though--a bit crooked here and there

I love that CNC though--good work there.
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post #20 of 49 Old 05-29-2010, 07:36 AM - Thread Starter
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I need more screws and then they should be a little straighter (my other one is). Eventually I'll be putting them behind speaker grill cloth or an AT screen, so I don't really care about how they look.

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #21 of 49 Old 05-29-2010, 11:26 AM
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o_O OMFG I hate you. That setup is amazing. *note to self--add cnc mill to project list.

Man, you probably even just had it pre-drill screw holes for you too...You could seriously make a nice little speaker building business with that .

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post #22 of 49 Old 05-29-2010, 11:31 AM - Thread Starter
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Snickel: great set of SLAs! I wish you were closer so I could hear them.

Starkiller: with only 800+ hours and thousands of $$$$ you can build a CNC router too. Of course you could just pay a few hundred dollars and have someone make the speakers for you....or spend $50 and a few hours and make them yourself! The CNC is great when you want to make dozens of pieces or have a very precise part, but otherwise doesn't make much sense -- even if you have a CNC available!

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #23 of 49 Old 05-29-2010, 11:53 AM
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Andreas and I have been talking with PMs. I think we should talk here it could help other people. Andreas I would just go ahead and build the TLAHs for surrounds and see what you think, they are cheap to build so just try them
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post #24 of 49 Old 05-29-2010, 12:06 PM
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Cliff notes on Andreas and my conversations. We both have small home theaters, I find my SLAs are so directional for surrounds that they only work good at my seating position. I am single so they work good for me
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post #25 of 49 Old 05-29-2010, 09:43 PM
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Haha yeah I know they're a lot of time and money. But I like the versatility and precision of a CNC. Clearly, speaker building is far from unlocking the full capabilities of the machine, but being a very DIY-oriented person I can just see the uses . I mean, heck I just took a welding class...not that I have a huge need for welding, just wanted to have it 'just in case'. And that says a lot about me .

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post #26 of 49 Old 05-30-2010, 05:01 AM - Thread Starter
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snickel: I think I will build at least one to see how I like them. Are you talking about not being able to hear them unless you are in your seat? I thought their vertical dispersion was lower, which is good, but the horizontal dispersion is the same as a single speaker. ?

Starkiller: Welding is fun and you can get your investment on a welder back with a couple of small jobs. A CNC is a lot more expensive (and time consuming if you make it). A CNC will only earn its money back with a lot of parts. Check out www.emachineshop.com It could be an alternative for you.

Everything I said about the CNC is to make a "good" CNC, mind you. If you want to make a small, cheap CNC out wood, that is going to give you a certain level of speed and accuracy compared to a larger steel CNC with industrial parts. A small, cheap CNC will take a lot less time and money to make.

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #27 of 49 Old 05-30-2010, 05:51 PM
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hmm the horizontal dispersion is the same as a single speaker? I have my SLAs pointing at me, maybe I should turn them more 2 the center of the room
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post #28 of 49 Old 05-30-2010, 06:55 PM - Thread Starter
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Quote:
Originally Posted by snickel View Post

hmm the horizontal dispersion is the same as a single speaker? I have my SLAs pointing at me, maybe I should turn them more 2 the center of the room

That's what Bill said: http://www.avsforum.com/avs-vb/showt...n#post18022491

He said it elsewhere too if you look up dispersion. Let us know if aiming them differently helps. I know the vertical dispersion is less the longer the array. That and the fact that the surrounds are much closer make me think that a 4 speaker array might be what I want for surrounds.

Current HT: HTPC-->Epson 5010 projector-->135" screen, BFM TLAHs x7 & THT
Build log: DIY rotary sub for contemporary HT in 100 year old house?
Andreas' Slow Rotary Sub build
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post #29 of 49 Old 05-30-2010, 07:22 PM
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They sound good to me but when i have friends over they can't hear the back 4 speakers cause they are aiming at me. I will move them and see what I think
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post #30 of 49 Old 05-30-2010, 07:41 PM
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Nice setup. Are you using Mach 3? What are you using for layouts?

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