Pics Altec VOTT A7 using CAD and CNC

**valhallax** · June 24th, 2014, 12:07 AM

right there in the living room...we should all learn from this example. an atta boy and a cheers to you sir, master of your domain. hehehe

GM · June 24th, 2014, 01:36 AM

Oh yeah! Looking good! Anything worth doing is worth doing to excess!

GM

**atilsley** · June 24th, 2014, 02:44 AM

Originally Posted by valhallax

right there in the living room...we should all learn from this example. an atta boy and a cheers to you sir, master of your domain. hehehe

Friend, it's a very fine line I tread. We've agreed there'll be no more routering or sanding inside....only gluing, nailing and clamping...!!

I'm in a very powerful position at home...I always get to choose which tea-towell I'll use to dry the dishes...!

**atilsley** · June 26th, 2014, 07:03 AM

**atilsley** · June 28th, 2014, 07:12 AM

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Wool felt in...not too heavy.

**atilsley** · June 30th, 2014, 08:16 AM

All finished, except for wood trim etc.

Using 515-G's, crossed at 550Hz, with 12db BW slope. I like the sound..have aded about 7db gain at 40Hz,

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**Altec Best** · June 30th, 2014, 04:09 PM

Looking Very Nice ! You should be proud, as you have done a beautiful job on those Vott's...

**atilsley** · July 1st, 2014, 02:00 AM

Thanks...it's my first pair. I've been working on tweaking the CAD plans if I build another pair. Some things worked out very well...other things needed some adjustment...eg, you can't put in the panels once the side walls have been glued...! Dumb. Needed to remove the protruding 'lugs' on one end to insert the relevant panels. I'd also dispense with the horizontal shelf...simply not needed. I'd remove some of the fancy bracing on the main large baffle piece....more intricate means more turbulance.

The things that worked well are:

bracing for the large back panel
pre-drilled screw holes everywhere
horn section supports...nice and thick 25mm MDF
the 3-way adjustable front vent with oval, fixed and open positions (I've only tested oval and open so far)
the CNC'd grooved horn flare pieces for easy bending
the lovely Euro Birch ply in 18mm (it would be quite expensive to veneer this with Walnut etc....the ply sheets would triple in price...I used 5 panels/pair)

I'd also CNC the driver mount holes for the relevant driver. Last night, I created a cardboard template taken off the 515G. This driver has 8 holes...but I only used 6 holes for mounting due to the exposed location of two screws holes at the horn throat.

I'd probably make the back panel 2/3 fixed (bottom), and a 1/3 removable panel at the top. The current panel has about 30 screws each...and is nicely connected with the vertical and horizontal braching (which also connects to the baffle board).

It's certainly been an enjoyable build though....

I have a new smaller bass horn to start in a week or two...which has similar top section to VOTT A7...but different cab. I'll start a separate thread on that.

Andrew