C-Horn all-ply version takes shape

atilsley · 16th September 2009, 02:23 AM

I started this all-ply version of the C-Horn today, using 25mm standard ply for the internals, plus a nice 12mm Kauri Pine ply outer panel. The 25mm acrylic side panels will still be used per my normal C-Horns.

Likely finish will be a light stain, plus a satin clear spray varnish. Sould look smart....a bit like the Clearaudio turntables using Panzerholz.

Working with ply is SO MUCH nicer than MDF!!...lighter too. The wieght should come down from about 95Kg each to a much more manageable 75Kg each (165 pounds).

I've tweaked the design to incorporate the cabinet being made in 2 pieces each side. This is much easier for sanding/finishing. The dowels will protrude from the ply internals and slot into the matching dowel holes on the acrylic sides to help with alignment, especially as the wood sections flex a little.

Large 75mm hex screws are used via the Oak dowels to secure the side panels....then plastic caps are fitted.

My friend who's getting these will be using the Fostex 206E driver....but we're going to router an extra channel into the horn slices to accommodate a possible Field Coil driver later on.

A fun project....

Andrew.

ltmon · 16th September 2009, 03:10 AM

Hi Atisley,

Looks nice, just like the originals.

Where do you get your ply in Australia? Without the cheap Baltic Birch available in the US the only quality stuff I can find is marine ply ($$$ where I've found it). Or is that just the cost of doing business down here?

atilsley · 16th September 2009, 03:23 AM

My CNC guy uses Mister Plywood normally. Note, the outer slices are the pricey Kauri furniture-grade ply.

To save on costs, we use the large 3.6m sheets. Heavy though....

Andrew

rjbond3rd · 16th September 2009, 04:49 AM

Hi atilsley,

Sorry if this is off-topic, but can you tell us what room these speakers will be in at RMAF?

atilsley · 16th September 2009, 04:59 AM

Sadly, they won't be at the show. I was going to be partnering with a US valve amp supplier - but it didn't work out as planned. Hopefully next year.

atilsley · 17th September 2009, 03:57 AM

Couple more pics from today's work....

atilsley · 17th September 2009, 05:05 AM

Now the first of the larger sections glued up, including routering a channel for the speaker cable. I'm running two sets of cable to possibly use a Field Coil driver later on.

atilsley · 18th September 2009, 03:18 AM

Getting there....

Photo shows Kauri side panel off, then on.

badman · 18th September 2009, 03:33 AM

All that work and a single constant dimension.....

Don Hills · 18th September 2009, 04:00 AM

It's a sculpture. A pair of them would be a talking point in any lounge. Might be good for Spousal Acceptance Factor too. The fact that it's a speaker is incidental.

18th September 2009, 03:33 AM	#9
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	All that work and a single constant dimension..... __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

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16th September 2009, 03:10 AM	#2
ltmon diyAudio Member Join Date: Sep 2008	Hi Atisley, Looks nice, just like the originals. Where do you get your ply in Australia? Without the cheap Baltic Birch available in the US the only quality stuff I can find is marine ply ($$$ where I've found it). Or is that just the cost of doing business down here?

16th September 2009, 03:23 AM	#3
atilsley diyAudio Member Join Date: Aug 2008	My CNC guy uses Mister Plywood normally. Note, the outer slices are the pricey Kauri furniture-grade ply. To save on costs, we use the large 3.6m sheets. Heavy though.... Andrew

16th September 2009, 04:49 AM	#4
rjbond3rd diyAudio Member Join Date: Jan 2007	Hi atilsley, Sorry if this is off-topic, but can you tell us what room these speakers will be in at RMAF?

16th September 2009, 04:59 AM	#5
atilsley diyAudio Member Join Date: Aug 2008	Sadly, they won't be at the show. I was going to be partnering with a US valve amp supplier - but it didn't work out as planned. Hopefully next year.

18th September 2009, 04:00 AM	#10
Don Hills diyAudio Member Join Date: May 2009 Location: Wellington	It's a sculpture. A pair of them would be a talking point in any lounge. Might be good for Spousal Acceptance Factor too. The fact that it's a speaker is incidental.

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