8inch coaxial hifi speaker build

great build 

beautiful! 

thanks all,

here's a closeup of the kerfs, you call also see the filler where I set the triming bit to low in the router and the bearing dropped into the port hole.



I would say that this is pretty close to the minimum bending radius you can achive using this technique. The radius is 120mm and you might be able to get it 10-20mm smaller. You could possibly go further if you cut the kerfs into the last laminate, but you'd be removing so much material that unless you filled the slots with resin you'd be weakening the wood considerably.

I had a load of 6.5mm birch to use up, so this tehcnique worked well for me, but given the choice I would rather layer up 3 or 4mm sheets. These cabinets are small (266x266x273) and I still had to cut 100 kerfs per box, for a bass horn or larger mid-top this would be a slow painfull process.

Incidently I was pretty shocked out how inflexible the 6.5mm birch py was without kerfing it. Minimum bending radius was in the order of several feet.




Edited by biotec - 19 April 2013 at 4:38pm

Like that mate

I've got both painted now but have only had time to load the driver and fit the hardware to one of them. I'll probably load the other and build the wall brackets this weekend if there's a break in the weather. I've got some 40x8 flat bar to make the brackets with but I'm not sure whether it'll be rigid enough in the way I plan to mount it. If necessary I'll grab some 40x12 to stiffen it up.

I did one coat of primer, 3 coats of undercoat, and 3 coats of satin. The finish is pretty smart and it'll fit in nicely with the white interior I'm putting in my truck.








I had a chance to listen to the one I loaded yesterday. I haven't installed the headunit or amps in the truck yet so I tested it off a Crown DC300 in my house. First impressions are great, the sound is awesome and f*ck me does it go loud. I may have tuned it a little high as it doesn't go as low as I expected, at a guess I'd say it starts rolling off about 70hz, but I'll play around with the ports this weekend.

Playing it alongside one of my bookshelf hifi speakers, it sounds clearer, without the boomy bass and missing midrange that a lot of small hifi speakers have. It doesn't go as low but the hifi speaker was making death noises when the coaxial still had 12db of gain! I threw most of one side of the DC300 into it and I got scared before it showed any signs of distress. Two in the truck will be able to go louder than I'll ever need for sure.

Here's a brief video to give you an idea of the sound. The camera mic was distorting when I got too close. Appologies for the wonky view and explicit music! I ahdn;t realised the track was quite so offensive untill I listened back!

Love the curved ply Nick,really lovely job.