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SALS?A! - a very long story
SALS?A! - a very long story
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Old 9th May 2021, 11:28 AM   #21
solhaga is offline solhaga  Sweden
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I must have a reliable stand for the speaker.
First I thought of doing it in 12 mm plywood:

Click the image to open in full size.

But on a second thought it will be it aluminium, cut out with my new CoreXY plasma cutter. It will be like a V on each side instead of the tripods.

Speaking of plasma cutter, here's how the front pole pieces are made.
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Old 23rd May 2021, 03:20 PM   #22
solhaga is offline solhaga  Sweden
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In the end the stand came out like this:
Click the image to open in full size.

Black spray paint to cover the ugly welding:
Click the image to open in full size.

More than half of the cassettes have now been printed!

So soon as the glue and paint has cured/dried on the second stand, I'll start mount the cassettes.

I've managed to get more or less ten pairs of every color, that is 42 cm, so I think that I will mount five pairs a side.
But not in the same order.
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Old 23rd May 2021, 04:35 PM   #23
WrineX is offline WrineX  Netherlands
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Oh you gone filter them vertical to ??? what i meant was if used fullrange and let the pleat depth dictate how low/high it plays it still screws it up (like the headphone was designed) but i guess you power the tweeter (midle part) seperate. i once tried it with different pleat depths without filter.. and kind of got what i expected... not so nice response haha
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Old 23rd May 2021, 05:29 PM   #24
solhaga is offline solhaga  Sweden
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I will make a rough guesses of the ratios tweeter/mid when I make the first couple of membranes.

Then I select the membrane with the best rough frequency responses.
I will then fine tune the frequency response for the two channels using convolution in Roon.

If I cannot get low enough cross feed between the tweeter and mid parts of the membrane,
I will have to make a retainer that separates them (and then make three membranes for every section instead of one).
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Old 29th May 2021, 06:56 PM   #25
solhaga is offline solhaga  Sweden
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As there can be a lot of membranes to connect, I bought some alligator clips:
Click the image to open in full size.
They are made of copper so they don't pull to the magnets.

They are so fantistatic that they require this bag:
Click the image to open in full size.
ESD sensitive, hmm.
But the distributor will never know if the bag will be near any ESD sensitive stuff.

I finally started with the gluing.
The cassette pairs don't want to be together, so I have to use clamps while the epoxy cures:
Click the image to open in full size.
I also have to wait for the curing before the next pair can be glued
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Old 31st May 2021, 05:57 PM   #26
solhaga is offline solhaga  Sweden
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The above method resulted in broken cassettes,
so I had to invent a better method.
Still using a clamp, but now with an aluminium profile to even the pressure.
First I have to check the polarity...
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Old 16th June 2021, 12:29 PM   #27
solhaga is offline solhaga  Sweden
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All cassettes are printed and mounted onto the stands.
Some tall speakers!

Remaining in this part is to cut the rest of the front pole pieces and then spray paint the loudspeakers black.
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Old 18th June 2021, 02:27 PM   #28
Webbi is offline Webbi  Germany
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Cool!
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Old 19th June 2021, 05:06 PM   #29
Marveloudio is offline Marveloudio  Germany
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Sorry for disappointing you but your driver will be not able to reproduce 1/3 octave pink noise around 90dB without large amounts of very disturbing noise!

Do not waste tons of money on idealistic projects , it's seductive to try something different but the involved physics are more complicated than you would imagine!

No transducer that cannot play pink noise without noise can be called high fidelity , therefore not suited for studio monitor application ...

but good luck anyway maybe you are the chosen one
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Old 19th June 2021, 05:20 PM   #30
solhaga is offline solhaga  Sweden
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Could you elaborate on the reasons for that?

Last edited by solhaga; 19th June 2021 at 05:22 PM.
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