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Old 24th December 2012, 10:44 AM   #21
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Good luck, mate. There'll be music from coast to coast down under by New Years I reckon.

If I should recommend something it would be to make sure the baffles that holds the speakers are the ones that are 300mm wide. Otherwise it can be a little flimsy when the woofer cut-out is made.

OH, and yeah, I just discovered this thread. Probably should've asked your questions in the Boominator thread instead.

Last edited by Saturnus; 24th December 2012 at 10:51 AM.
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Old 27th December 2012, 07:09 AM   #22
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A whole day of cutting, drilling and routing has gotten me a little closer!

Air vents/handles to drill/route, and recessed tweeter holes to saw/route.

Then I think the box's will be ready to assemble/glue.

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Old 27th December 2012, 01:51 PM   #23
JMFahey is offline JMFahey  Argentina
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Hey!! Nice build!!
Congratulations
As of the series piezo resistor, you needn't calculate it as if setting a "crossover point" , that's taken care of, like it or not, by the physical vibration properties of the disk itself.
That it's "seen" as a cap is , let's say, a "side effect".
You simply add a series resistor so impedance does not fall too much at high frequencies, plus most amps do not like capacitive loads.
Any empirical value you choose is fine.
I use 10r to 47r , depending on what's on hand , and don't find any difference in sound.
Now 300 ohms I find a little too high, and it will pad the output in general, or makes it somewhat duller.
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Old 28th December 2012, 05:07 AM   #24
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Righto cheers for the info on the resistors.

Everything on hold for 5 days as I have taken my family out to the bush for 5 days for New years. Project will resume in 5 days :-)
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Old 3rd January 2013, 08:25 AM   #25
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All holed drilled, routed and jigsawed. Test run fitting.

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A jig I made to do the rebate routing for the tweeters

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Gluing the internal bracing (picture would not upload)

Screwed woofers and tweeters in, wired in one side to L & R , soldered in the resistors for a quick sound test... going to sound AWESOME!

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Getting closer!
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Old 5th January 2013, 06:24 AM   #26
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Tested with all speakers hooked up, but only held together with clamps, and it sounds like it has the possibility to sound good once it's fully sealed.

Wire I used was too heavy, as couldn't get all 4 wires together to go into the speaker post clamp. so I'll get some lighter wire when I do the final put together.

I need to get some 'rope caulk' or putty to dampen the tweeters and some epoxy for the woofers front and rear mounting.

Also the Batteries I have are too big, so I am going to grab 2 x 12v 7ah from the local battery shop and stack them.

The gluing has begun.

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Old 21st January 2013, 11:20 AM   #27
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Second boominator being created, much like the first one.

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Once they are both ready for internal treatment (water proofing).

Then I can proceed with Modding the piezo's and mounting the grill's & woofers to the baffles.

Still working out the power side of things and weither I'll mount the charger in the box ( just need a power plug then to charge it).

Cheers, S.
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Old 3rd February 2013, 04:31 AM   #28
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Slow progress.

Spent a fair amount of time working out what I was going to do with the battery/amp mounting, and ended up with a solution.

Did not want to fully seal the whole thing, so i am going to make the top removable, will seal with a thin rubber lining around the eadges and brackets and bolts to hold the top on firmly should make it air tight enough that I won't compromise the DB levels by not full sealing it, but make it accessable to change batteries and access to speakers etc.

I also wanted all sides to look seamless.

Cut and route some air vent holes in the baffles.

Painted the inside wall of the baffles in while undercoat.

Rubbed in a clear polyurethane coating on the outside of the baffles.

apply some gap filler material treatment to the tweeters.

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Old 3rd February 2013, 06:22 AM   #29
JMFahey is offline JMFahey  Argentina
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Love whay I see so far
Don't over think it (such as damping the tweeter surfaces), just go on and finish it.
Sound will be ***killer***
Will you use those batteries in parallel or series?
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Old 4th February 2013, 05:14 PM   #30
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Looks interesting so far. Way better woodworking than I could ever do too.
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