My Pluto @ fdj.org.uk

Here are some photographs of my Plutos under construction:

For those who have never heard of this amazing design, look at the Linkwitzlab site.

Incidentally, I love the design and the "Industrial" look.

Notes about pipework in the UK.
Large pipe:  110mm Soil/Vent pipe in the UK has 4" internal diameter which is exactly right for this application. However, the wall thickness is only 3.6mm.
I am using this pipe but if you want thicker walled pipe, then you must obtain this from a specialist pipeline supplier. (see below)
Beware that pressure pipe is sold in 6m lengths so a group buy would be beneficial

Small pipe:  40mm is too small, 50mm is too big. The tweeter has an external diameter of 47mm. Metric waste pipes in the UK have very thin walls and (in my opinion) is no good for this application.

I used 1 1/2" Class D Pressure pipe. The solvent weld fittings are very substantial and have an internal diameter of 48mm and so will easily fit the tweeter with a little shimming.

Links:  Pipeline supplier Pipestock.com

If you haven't already been there, please visit the Linkwitz Lab site and read all about the deisgn of this and other innovative loudspeakers.

I thought about improving the bass driver to pipe mounting arrangement.
I ended up cutting two adaptor flanges from 18mm MDF as shown below.

The rings have an inside diameter to suit the Peerless 832873 and are a close fit inside the rubber coupling. The flange is 4mm thick and sits on top of the rubber coupling.
There is a large surface area for the glue and of course the rings keep the large opening on the rubber coupling circular.
They were cut using a router with circle jig. MDF is OK as long as you realise its limitations. It is basically thick cardboard. I always give MDF components a couple of coats of diluted PVA and sand between coats. This gives them a smooth, hard finish and makes them non-porous.

These are such a good fit within the coupler that no glue is really required. Alternatively, the large "Jubilee" clip supplied could be used but I'm not using it.
The adapter rings will be painted matt black. (Black is so difficult to photgraph!)

Pluto +

I Have now finished my Pluto+'s and am very pleased with the results.

I actually made the cabinets 100mm taller and formed a top compartment into which I built the ASP board and power amplifier.

See the filmstrip index for pictures.

Finally, I would like to express my thanks to the Pluto designer, Siegfried Linkwitz.
Assembling the Pluto PCB's was an absolute joy. The boards are very high quality, everything fitted as it should and they worked first time.

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