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SALS?A! - a very long story
SALS?A! - a very long story
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Old 27th September 2021, 08:37 PM   #61
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by WrineX View Post
very nice i made this kind of thing a while ago. im not sure what made me dispose of it (might be my not so perfect folds) looking forward to you result ! looks great so far !
Thank you, Wrinex.
I hope that I in a day or two will have some measurements made.
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Old 27th September 2021, 08:40 PM   #62
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by WrineX View Post
damned i want a plasma cutter to looking for an affordable one i can strap to the cnc may i ask what one you used ? if it is a hypertherm.... i must save some more i gues haha
I'm using a Hypertherm 45XP.
As I value my time a lot, I couldn't afford anything less.
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Old 28th September 2021, 08:15 AM   #63
solhaga is offline solhaga  Sweden
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First membrane mounted in a speaker:
Click the image to open in full size.
There might be need of an extra support at the middle of the membrane.

It'll be 11 mm in height between active membranes.
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Old 28th September 2021, 12:48 PM   #64
WrineX is offline WrineX  Netherlands
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damned a hypertherm haha i was afraid you would own one well if it is your work for instance !! i understand

maybe i should see if i can find a used one. i mean 1500 is allot of money


By the way i like the more simple design you build now, with the 3d printed bracket holding the steel in place. they also seem to work to not interfere (diffraction and such)

Last edited by WrineX; 28th September 2021 at 12:51 PM.
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Old 28th September 2021, 03:57 PM   #65
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by WrineX View Post
damned a hypertherm haha i was afraid you would own one well if it is your work for instance !! i understand

maybe i should see if i can find a used one. i mean 1500 is allot of money
I think I paid almost double that amount, with some extra consumables though.

Quote:
Originally Posted by WrineX View Post

By the way i like the more simple design you build now, with the 3d printed bracket holding the steel in place. they also seem to work to not interfere (diffraction and such)
Yes, when I made SLAM!, 3D printing was new for me.
I actually bought the printer after I started that project.
And I had ordered the pole pieces from a shop, they were €1.50 each.
Now I can make them for "free" with my own plasma cutter.
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Old 29th September 2021, 04:07 PM   #66
solhaga is offline solhaga  Sweden
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Some first measurements then at approximately 1 W.
Only two membranes and no back pole pieces.
SALS?A! - a very long story-mid-hp-500-hz-jpg
SALS?A! - a very long story-tweeter-hp-1000-hz-jpg
SALS?A! - a very long story-tweeter-hp-1000-hz-mid-hp-250-hz-jpg
SALS?A! - a very long story-tweeter-hp-1000-hz-mid-hp-500-hz-jpg
SALS?A! - a very long story-tweeter-hp-1000-hz-mid-hp-500-hz-1-jpg
So the SPL at 1W 1 meter is a little bit low and the distortion is a little bit high.
But I reckon that the back pole pieces will add 3 to 6 dB and they will also lower the distortion levels.
Doubling the amount of membranes twice will also add at least 6 dB.
So I guess it'll be above 95 dB in sensitivity at 1 meter for the full SALS?A!

Frequency response slopes down above 15 kHz and are more or less the same for both mid and tweeter.
I don't know how much the narrower back pole piece for the tweeter section will help.
But the tweeter section is not only about high frequency response, it will also have a muck better dispersion being only ten millimeters wide.
Attached Images
File Type: jpg Mid only HP at 500 Hz.jpg (327.8 KB, 139 views)
File Type: jpg Tweeter only HP at 1000 Hz.jpg (312.0 KB, 135 views)
File Type: jpg Tweeter HP at 1000 Hz Mid HP at 250 Hz.jpg (343.9 KB, 136 views)
File Type: jpg Tweeter HP at 1000 Hz Mid HP at 500 Hz.jpg (332.8 KB, 132 views)
File Type: jpg Tweeter HP at 1000 Hz Mid HP at 500 Hz At 1 m.jpg (329.7 KB, 133 views)

Last edited by solhaga; 29th September 2021 at 04:31 PM.
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Old 29th September 2021, 09:33 PM   #67
solhaga is offline solhaga  Sweden
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I'm thinking of adding supports for the tweeter part of the membrane.

If I replace an ordinary 3 mm back pole piece with a 1 mm tweeter support:
Click the image to open in full size.
together with a 2 mm back pole piece:
Click the image to open in full size.
I'll get four 65 mm sub-sections and the HF response should get better.

The rest of the back pole pieces are still 3 mm thick.
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Old 30th September 2021, 01:47 PM   #68
solhaga is offline solhaga  Sweden
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I did four supports, so there's five sub sections in a membrane
Click the image to open in full size.
The support also helps keeping the mid in the middle of the gap deepth.

Now I got to make 66 3 mm back pole pieces and then I can redo the measurements above.
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Old 2nd October 2021, 04:47 PM   #69
solhaga is offline solhaga  Sweden
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Measurements on the same two membranes but now with the back pole pieces.
Click the image to open in full size.

No HP filtering and still with 1 W input power:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

So SPL went up overall by 6 dB!
One can see that the tweeter needs a HP filter at 2 kHz or so but the mid HP filter can be lower than the current 500 Hz.
Lets see how it all plays later in the complete system.
With some FIR filtering this is going to be good.

So now I have to produce the rest; this was only an eight.
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Old 4th October 2021, 01:03 PM   #70
solhaga is offline solhaga  Sweden
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Horizontal dispersion; -45° to 45°. The order is given by the colors given at vertical cursor at 10.29kHz.
Click the image to open in full size.
Measured at 1 W and 60 cm distance.

It is hard to read because of the reflections from the room and furniture, but I think it looks as expected.
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