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Multi-Way Conventional loudspeakers with crossovers

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Old 16th May 2018, 12:47 PM   #2491
MITsound is offline MITsound  Canada
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Any particular reason not to make them 4 or 8 ohms?
Something to do with phase angles in a passive crossover to a dynamic driver?
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Old 16th May 2018, 01:05 PM   #2492
JonasKarud is offline JonasKarud  Sweden
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Its not that they are at 5 ohm that is important, its that they have identical values.

So, for example, that they will have the same voltage sensitivity...
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Old 16th May 2018, 02:20 PM   #2493
vemsom is offline vemsom  Sweden
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Awesome Jonas!
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Old 17th May 2018, 07:47 PM   #2494
fotsinijts is offline fotsinijts
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Quote:
Originally Posted by JonasKarud View Post
Here's some pictures of my new dipole tweeter. The membrane is made of 8 uM alu laminated to Mylar. Usable frequencies: 1,5 to 35 kHz.

It took me 3 years to come up with a method to produce perfect 5 ohm tracks!

The membrane is only attached at the short sides, which lowers the distorsion.

Cool possibility: Using the visible ends of the red protecting rods to indicate date of production in binary form!
Wow these are really neat! Is there a topic about these somewhere, would love to build something similar!
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Old 18th May 2018, 08:35 AM   #2495
JonasKarud is offline JonasKarud  Sweden
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No topic, what I know of....

But if You have a 3d printer, I can send the STL files for the magnet holder assy and the front baffle. The magnets are:

Q-40-10-10-N: Block magnet 40 x 10 x 10 mm - supermagnete,

Six of them in each tweeter.

The big problem are the membranes, they are a pain in the to make....
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Old 18th May 2018, 08:52 AM   #2496
fotsinijts is offline fotsinijts
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Cool, I have a 3d printer so that part is covered. I also have acces to a lasercutter that would maybe be handy for making the membranes?

How did you made them? They look really neat

EDIT: Plotting would maybe be better I think
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Old 18th May 2018, 01:38 PM   #2497
JonasKarud is offline JonasKarud  Sweden
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The membranes are made by cutting a self adhesive foil and then use this as an etch mask. I've tried different lasers/methods, but they are useless on this thin material.
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Old 24th May 2018, 08:08 PM   #2498
arjanm is offline arjanm  Netherlands
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Default concrete open baffle

my first attempt making a open baffle

before this i owned the emerald physics cs2
never have build any speaker or open baffle before
so i am still learning and must have read al there is on open baffles on diyaudio forum .but still trying to wrap my head around it

for this one i just wanted to make something that could rattle the house but not the baffle and looks cool also \at least i think it looks cool


baffle and waveguide made out of concrete
drivers used are / ea dipole15/bms 4550 on a custom concrete seos 18 waveguide

active crossover and eq on computer
macbook logic audio and fabfilter pro q and rme ucf

my next one will be a 3 way by adding a midrange driver


work in progress.....
Attached Images
File Type: jpg dipole front.jpg (39.8 KB, 1191 views)
File Type: jpg dipole side .jpg (46.0 KB, 682 views)

Last edited by arjanm; 24th May 2018 at 08:30 PM. Reason: adding pictures
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Old 24th May 2018, 10:08 PM   #2499
diyaudnut is offline diyaudnut  United States
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very nice!

How did you mold the wave-guide profile?
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Old 25th May 2018, 05:38 AM   #2500
arjanm is offline arjanm  Netherlands
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i used liquide silicone that i poured in the original waveguide
and before put some vasalin in the waveguide
and than i put the mould upside down and with wood made the outside contour
silicon does not stick on concrete so getting in out was easy

for the mounting of the driver i used a aluminium horn adapter cutted of the 1” screw pipe and put boulds in the 3 not used holes those are now fixed in the poured concrete

forgot to make pictures of the process
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