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Sierra

Another Troels Gravesen's DTQWT Project Build

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good work! What technique do you plan on using to attach the vaneer?

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Greetings all. I've just joined up, and notice that now I see all the juicy pics instead of wondering about those addresses.

My news is that over the last few months I've received the Jantzen kit, the Deltalite woofers, and some Baltic Birch ply, to build a pair of Troels' DTQWT-12s.

These might be the first in Aust, maybe the first in Tassie, anyway. I asked Troels, and he can't know from kit sales: the kit, including crossovers, is the same as for the 10" version, just in a 300 litre cabinet.

Good to have some questions answered here already: I too was wondering about the screw holes in the Deltalites: an otherwise beautiful and immaculately built speaker. Troels has been quick and very deft in his replies, so I feel well supported in the project.

Looking forward to making some room in my workshop, and more updates, Sierra.

Cheers,

Brian.

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good work! What technique do you plan on using to attach the vaneer?

The vaneer is the iron on type ... as for the exact teqnique that's up to my cabinet maker ... I've never done any vaneering work myself so have no idea :)

Looking good there Alan, when are you hoping to have them finished?

Thanks Pat!

I hope that they will be finished some time around November.

Greetings all. I've just joined up, and notice that now I see all the juicy pics instead of wondering about those addresses.

My news is that over the last few months I've received the Jantzen kit, the Deltalite woofers, and some Baltic Birch ply, to build a pair of Troels' DTQWT-12s.

These might be the first in Aust, maybe the first in Tassie, anyway. I asked Troels, and he can't know from kit sales: the kit, including crossovers, is the same as for the 10" version, just in a 300 litre cabinet.

Good to have some questions answered here already: I too was wondering about the screw holes in the Deltalites: an otherwise beautiful and immaculately built speaker. Troels has been quick and very deft in his replies, so I feel well supported in the project.

Looking forward to making some room in my workshop, and more updates, Sierra.

Cheers,

Brian.

Welcome to SNA Brian ...

Wow that's a hell of a project ... the 12" version is massive and with a low WAF (Wife Acceptance Factor) difficult to get away with ... :P

Troels is really helpfull and very quick to answer questions which is great.

As the build progresses I'll post up some pics on how I'll screw the Deltalites in.

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Some more pictures

Cutouts for the 10" Deltalite's on the rear baffle

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Centre pin hole for front baffle cut outs

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Wave guide cut out

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Cutout for the 8" Driver

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45 deg backcut on the inside of the 30mm baffle

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Cutouts completed

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Thanks Henry ...

The lighter timber is Tasmanian Oak and the darker is Jarrah.

The mdf cabinet will be vaneered with Tasmanian Oak.

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It's looking stunning already!

There's a lot of work been put into that one...

SS

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Fantastic pics, thanks Sierra. I reckon you'll be done before November at that rate!

I'm interested in what sort of nice screws you found for the waveguide: they look like a hex drive, with perfect sized tops. I have black self-tappers from Jaycar, but they are just Philips head, and the heads are quite narrow. The best fit for the 7mm Deltalite holes I've found so far are 14ga self-tappers - perfect fit, if rather over-engineered, but will have to cover the silver with paint or texta.

I did get the recommended bolts and helicoil bushes from Jantzen, but I can't get the bushes to screw in straight, despite trials with 3 different drill sizes, so have abandoned that idea. 24 Euros later... Your Deltalite holes look quite large, so I'm wondering if you're going to use bolts and those pronged rear nuts?

With the routing of the rear chamfer: did you use an external circle for a profile, or somehow stick your pivot pin into something of the same thickness as the baffle? Looks like it'd be easy to get the wobbles up, with so little base to use.

Love the Jarrah: it's very fruity red, and makes the Tas "oak" look a lovely pale hue. I've avoided the usual bought "oak" so far, as it tends to go dark and depressing with old age (bit like looking in the mirror), but some of the gum trees cut here are very pale. I did find some 70 x 45 Baltic Birch here, but it's full of little knots, and I'm hoping to find some clear Celery Top to go next to some (also Tas) myrtle strips, like Troels does with Mahogany.

It's certainly a big project, putting these together. I've done 6 panels so far, and the learning curve is rather steep and tortuous.

Keep up the good work and photography for us!

Cheers again

Brian.

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It's looking stunning already!

There's a lot of work been put into that one...

SS

Thanks for the kind words SS ... still a bit more work to go yet.

@ BioBrian

Hopefully it will be complete in November sometime.

Regarding the screws I'm using for the waveguide .... you're right they are indeed hex head ... I've used 4mm x 15mm hex heads and also got 4mm flat washers to suit.

The big holes you noticed on the rear baffle of the Deltalites are because I am using the helicoil bushes even though they are annoying to try and insert straight.

To get the 45 deg chamfer on the inside of the baffle we simply used a 45 deg router bit which had a bearing guide and ran the guide along the inner edge of the cut out.

Hmmm ... I hope the Tasmanian Oak doesn't get darker over time ... oh well ... time will tell I suppose.

More pictures to come :)

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I love the look of Australian timbers when used to finish speakers of any kind. The workmanship in your build is very high, you will have a fine sounding speaker that also doubles as fine furniture.

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where can one buy the tasmanian or jarrah board?

I've used both Trend timbers and Anagoat timbers in Sydney. Either should have Tassie Oak, Jarrah and many others in stock.

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I love the look of Australian timbers when used to finish speakers of any kind. The workmanship in your build is very high, you will have a fine sounding speaker that also doubles as fine furniture.

Thanks LJT

That's exactly what I am after ... a speaker that is a nice piece of furniture as well.

The credit for the workmanship goes to a friend of mine, Brian McMillan from McMillan Fine Furniture in Ballarat (shameless plug) :)

where can one buy the tasmanian or jarrah board?

The timber for mine was sourced from Britton Timbers ... there is an outlet in NSW ... but any timber merchant should stock those.

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Some more pictures ...

Looking upwards into the horn showing the internal bracing ... also note the knife edge chamfering of the front baffle.

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Scallop routered on the internal radius panel of the horn for the Audax TW034XO-P47N Tweeter.

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Felt lining panels cut out ready to be glued on.

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Felt lining glued on and polyester foam added.

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Thanks for looking :)

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