Yes i will post when i'm finished , mine is a 3 way with both high/mid
ribbons .......
Currently waiting to get my testing lab back up , currently my leap/LMS package is down and then the tedious task of testing different diaphragm corrugations. The Prototype so far has been very pleasing ...
ribbons .......
Currently waiting to get my testing lab back up , currently my leap/LMS package is down and then the tedious task of testing different diaphragm corrugations. The Prototype so far has been very pleasing ...
bases are finished, baffles complete...
These are crossed at 200hz/12db slope.
The Bookshelfs handle the bottom end.
I tried a foil from .22uf cap and it was a SMIDGE clearer up top, but sounded like a trash bag in the wind when lower sounds were cranked.
There is no significant difference in sound to me between the two types of ribbons that a small adjustment to the EQ could not fix.
Pros to lighter foil were higher treble response and (maybe) some more clarity.
Cons to lighter ribbon are higher x-over point, and like 8x the power consumption.
Pros to 4 piece foil ribbon stuck to packaging tape are SUPER durability and they play lower without audible distortion. Loud too.
Cons are extension into higher range somewhat hampered, and (maybe) less clear, but not enough for me to try to keep .5 um foil in one piece on these things. Those are delicate, to say the least...
I used cement to hold the baffles in place in the stand. There are long screws in the base and in the baffle material to keep things from wiggling apart too easily...
Next I made (very haphazardly and without thought to positioning) cover plates to hide cement...
here is a full photo of finished...
Top...
base...
I am not completely happy with the bases, but it will work for now.
The tops are uneven, this does not bother me. They are after all, hand-made... I am going to cover the backs of these with grille-cloth, wrapped onto frames countersunk into back and held by velcro. I may or may not shield the front slots/exits with a mesh I have on hand..
The lumber used for these speakers was the CHeApESt sTuFf TheY Had at home depot.
I am looking into other means of standing these too...
The motors are designed to be removed and replaced and can be installed anywhere that a 60"slot can be cut or made..
They are wonderful overall and sound more amazing than I had expected them to.
paul
These are crossed at 200hz/12db slope.
The Bookshelfs handle the bottom end.
I tried a foil from .22uf cap and it was a SMIDGE clearer up top, but sounded like a trash bag in the wind when lower sounds were cranked.
There is no significant difference in sound to me between the two types of ribbons that a small adjustment to the EQ could not fix.
Pros to lighter foil were higher treble response and (maybe) some more clarity.
Cons to lighter ribbon are higher x-over point, and like 8x the power consumption.
Pros to 4 piece foil ribbon stuck to packaging tape are SUPER durability and they play lower without audible distortion. Loud too.
Cons are extension into higher range somewhat hampered, and (maybe) less clear, but not enough for me to try to keep .5 um foil in one piece on these things. Those are delicate, to say the least...
I used cement to hold the baffles in place in the stand. There are long screws in the base and in the baffle material to keep things from wiggling apart too easily...
An externally hosted image should be here but it was not working when we last tested it.
Next I made (very haphazardly and without thought to positioning) cover plates to hide cement...
An externally hosted image should be here but it was not working when we last tested it.
here is a full photo of finished...
An externally hosted image should be here but it was not working when we last tested it.
Top...
An externally hosted image should be here but it was not working when we last tested it.
base...
An externally hosted image should be here but it was not working when we last tested it.
I am not completely happy with the bases, but it will work for now.
The tops are uneven, this does not bother me. They are after all, hand-made... I am going to cover the backs of these with grille-cloth, wrapped onto frames countersunk into back and held by velcro. I may or may not shield the front slots/exits with a mesh I have on hand..
The lumber used for these speakers was the CHeApESt sTuFf TheY Had at home depot.
I am looking into other means of standing these too...
The motors are designed to be removed and replaced and can be installed anywhere that a 60"slot can be cut or made..
An externally hosted image should be here but it was not working when we last tested it.
They are wonderful overall and sound more amazing than I had expected them to.
An externally hosted image should be here but it was not working when we last tested it.
paul
Re: poopydoopynoopy's Ribbon
they sound better than any 'normal' speaker i've heard
No, they produce sound
Actually, if they are the 'right' distance from the wall behind, they do sound like 5.1 almost.
No they are real.
See last answer..
They sound like 5' speakers that give very finite information from recordings that I had not heard through anything else..
hope that helps!
paul
R. Jamm said:
they sound better than any 'normal' speaker i've heard
No, they produce sound
Actually, if they are the 'right' distance from the wall behind, they do sound like 5.1 almost.
No they are real.
See last answer..
They sound like 5' speakers that give very finite information from recordings that I had not heard through anything else..
hope that helps!
paul
You can try ARTA. It is free. I found the ARTA step program very useful to measure distortions.
Around 1Khz and 8 Khz and quite large about 10 dB.
I build the thing and quit with the design because of the large peaks.
De design is perfect for the magnetic pad but not for the acoustics.
Build an normal ribbon later with square iron bars and had only 2dB less output but no peaks at all.
Maybe I can find the measurements then I will post them here.
Rob
I am looking forward for the measurements. I wonder what is the high frequency extension of a long line array. Thanks.
Bruno
Pictures Please
Also like to know where this was tested size of room floor/wall coverings/whatnot thanks...
Mine are very holographic ..
Yes the same i use direct foil with 150 watt worth of wire wound vishay resistors @1.2ohm /heat sinked. I'm using a high gradefoil with memory, ( cheap foil had too much hash and no memory) with mylar tape backing for damping. Sound is excellent , efficiency low and is my major concern for ding an revamped model.
What 2 cavities .. i cannot see......
I have seen it mentioned a bit around here, my issue is with leap , my key stopped working and Linear -x wants 1200 to update
and have it opened, LMS still functions.Whats a usefull sims software for importing LMS info ..?
Mine is 242 MM , it has very good top end , I will be dragging it outside for updated measurements, before pulling it down...
regards,
Attachments
Last edited:
From post #15:
The first cavity is made of the space between the two steel bars that hold the magnets. The second, bigger, is made of wood. The second one is easy to see at the bottom of the picture.
Suggestion: line the cavity surfaces with wool felt.
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