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speaker build ( tri trix tl )

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Project by haskins posted 01-30-2015 06:12 PM 2011 views 2 times favorited 8 comments Add to Favorites Watch

One of our bigest projects to date and what a learning expeince. First time dealing with mdf. The base is birch plywood trimmed with brazillian cherry. Might have went a little big on the base size, but hey you wont knock these things over. The plywood got very close to sanding thru even though it was barely sanded . A consequence of this was it blotched terribly with the intended burgandy stain. Despite all the fair warnings online we resorted to polyshades (poly with stain) to cover it up. Turned out okay. The other big mistake was rolling on the gloss black enamel. We thought the ultra smooth roller would be okay, it wasn’t. The speaker mounting screws are one of the more demanding aspects of the job..very little room for error as the recessed cavity is super tight.

Parts express had the plans Online. This is the ‘tall boy’ transmission line with the port in front (Seems like everyone builds the rear port version). These things are crazy heavy. 1 sheet of .75inch mdf, half a sheet of plywood, plus several more pounds in components, feet etc. We opted to mount the crossover in the open part of the back…semi exsposed one a piece of lexan. i like how that turned out. The grills are also homemade. Neomydium magnets embeded in the front baffel. Pine frame that was wrapped with a thin black cotton fabric. played around with available material and this seemed to impede air flow the least.

They sound great! even though they are still in the break in period. probably have $250 to $270 in it, with half of that being the electronics. Still need to wax and polish everything. About half way through we were really getting impatient with wanting to hear and play with these. Thank you experienced speaker builders here who answered questions and provided support on the project’s blog.

-- father son woodworks





8 comments so far

View Bud_3's profile

Bud_3

673 posts in 686 days


#1 posted 01-30-2015 06:24 PM

From pictures they show acceptable.Tell us more about how the t line looks inside or what filters do you choose.

View haskins's profile

haskins

126 posts in 700 days


#2 posted 01-30-2015 06:58 PM

Bud 3 if you go to my blog the latest one has pictures toward the end of it on the cabinets insides And crossover. If you google tri trix page 3 you will get the dimensions etc. for several design variations. The transmission line (as i understand it) gives a bump in the bass response according to the length to the opening (see link below) It is different from a ported speaker. my impression is that it produces impressive low end for a 5 inch driver.

http://en.m.wikipedia.org/wiki/Acoustic_transmission_line

-- father son woodworks

View Bud_3's profile

Bud_3

673 posts in 686 days


#3 posted 01-30-2015 07:13 PM

ok,thank you.

View wunderaa's profile

wunderaa

243 posts in 1665 days


#4 posted 01-31-2015 12:32 AM

Came out great! Seems like you enjoyed the build. Nice work!!

View CharlieK's profile

CharlieK

467 posts in 3255 days


#5 posted 01-31-2015 03:22 PM

Those are some serious looking speakers! I would like some like that for my shop!!

Charlie

-- Adjustable Height Workbench Plans http://www.Jack-Bench.com

View Gianni's profile

Gianni

228 posts in 1436 days


#6 posted 02-01-2015 11:26 AM

Speaker design is so much fun, and mdf machines so easily. I’ve got another speaker/stereo project upcoming, but it’s for a work truck, so I’ll use ply since water is likely.

I’m curious how well the trans line works. I usually stick with ported or sealed box designs for simplicity.

View haskins's profile

haskins

126 posts in 700 days


#7 posted 02-01-2015 08:34 PM

Gianni,

I’m impressed with the amount and quality of the bass these speakers are producing. I was afraid they would be inadaquate for the large open space of our living room, that doesnt seem to be the case. If you put your ear near the trans line opening, what you hear (and feel) is the very low end. lower frequencies than youd expect from this size drivers.

i’m an electrical engineer, the transmission design appealed to me because its used so often In the electrical world.

-- father son woodworks

View Gianni's profile

Gianni

228 posts in 1436 days


#8 posted 02-05-2015 12:33 AM

I still run into the occasional waveguide myself from time to time!

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