Hi All.
7 years ago i build some els and they have served me very well until last week when my 2 cat´s took a nasty fight and overturned the one els and it is now dead for ever🙁 so i will build new ones, i will this time try and make them with wire stators instead of perforated metal sheets and now i have some questions i hope you great guys can help me with.
first what is the best way to connect the wires? i have take a picture of differents connections methods of the wire but what is the best way?
second can i avoid membrane support if i make the panel 120cm (47 inch) high and 15cm (about 6 inch) wide my d/s will be 1.5mm (0,060 inch) my old panels was 100cm (39inch high) and 22cm (8,6inch wide) and was suppoted every 10cm(4inch) i know the rule of thump what the membrane support shall be around 70-100 x d/s, the panel i will make is high and narrow so is supports required? i will again go hybrid and my crossover frequency will be in the range of 250/300 hz and cutoff 24 or 48 db.
wire i plan to use is awg20 solid copper core with pvc isolation
i will use wire suppots every 10cm (4 inch) is this ok?
membrane material is 6um dupont c mylar stretched 1%
coating is again varmason statguard floor polish.
thats was all for now.
LS
7 years ago i build some els and they have served me very well until last week when my 2 cat´s took a nasty fight and overturned the one els and it is now dead for ever🙁 so i will build new ones, i will this time try and make them with wire stators instead of perforated metal sheets and now i have some questions i hope you great guys can help me with.
first what is the best way to connect the wires? i have take a picture of differents connections methods of the wire but what is the best way?
second can i avoid membrane support if i make the panel 120cm (47 inch) high and 15cm (about 6 inch) wide my d/s will be 1.5mm (0,060 inch) my old panels was 100cm (39inch high) and 22cm (8,6inch wide) and was suppoted every 10cm(4inch) i know the rule of thump what the membrane support shall be around 70-100 x d/s, the panel i will make is high and narrow so is supports required? i will again go hybrid and my crossover frequency will be in the range of 250/300 hz and cutoff 24 or 48 db.
wire i plan to use is awg20 solid copper core with pvc isolation
i will use wire suppots every 10cm (4 inch) is this ok?
membrane material is 6um dupont c mylar stretched 1%
coating is again varmason statguard floor polish.
thats was all for now.
LS
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From a theoretical standpoint, the connection methods you show are equivalent. Having more connection points helps if you have a break in your wire though. Also, if you are going to segment your panel through resistors to adjust polar and frequency response, having more points to tap in is useful in case you want to try different designs.
Now for the parts that are more preference/opinion:
I would typically run a narrower panel at that spacing and length, but what you are proposing is probably feasible if you can build very flat and if you are willing to back down your bias a bit if required. Your fundamental resonance will be quite low, which may or may not be helpful, depending on what your crossover slopes wind up being, damping, etc. At that spacing and width, you don't want to excite an undamped very low frequency resonance, as it's likely to use up your spacing.
I'm a fan of the Acoustat construction method for wire stators. It helps keep things flat without much effort. They aren't as pretty though, so if naked panel aesthetics are a major design point for you, the Audiostatic style you seem to be describing is more suitable. I haven't built those myself, so can't comment on your proposed support distance.
Now for the parts that are more preference/opinion:
I would typically run a narrower panel at that spacing and length, but what you are proposing is probably feasible if you can build very flat and if you are willing to back down your bias a bit if required. Your fundamental resonance will be quite low, which may or may not be helpful, depending on what your crossover slopes wind up being, damping, etc. At that spacing and width, you don't want to excite an undamped very low frequency resonance, as it's likely to use up your spacing.
I'm a fan of the Acoustat construction method for wire stators. It helps keep things flat without much effort. They aren't as pretty though, so if naked panel aesthetics are a major design point for you, the Audiostatic style you seem to be describing is more suitable. I haven't built those myself, so can't comment on your proposed support distance.
Pic 1 would be the easiest, which is the way that I've done it on all my wire panels.
Yes, you can avoid a membrane support if the panel width does not exceed 100x d/s.
If you go to the high side of the 70-100 x d/s, then I would apply a high tension on the diaphragm-- let's say 2% elongation if you use 6-micron film.
A 6" wide panel will have a rather high dipole roll off so you would need to set the crossover higher than you suggested, or use a whole of of EQ, or better--- use a wide frame around the panel to increase the effective baffle width (add some wings maybe).
UL1061 or UL1429 single-strand wire in 20awg, spaced at 11 wires per inch would give you ideal open area (43%). The two wires I just named use .009 & 0.010 PVC insulation, respectively, and the wire O.D. is only 0.052 or 0.053, respectively. Whereas; most other UL spec wire uses .016 thick insulation with O.D. is too large to use 11/inch wire spacing. The target for wire spacing should be around 43%.
Unfortunately; UL1061 and UL1429 wire are not generally available in small quantities-- the min buy is typically 10,000 feet! If you IM me, I could probably hook you up with some UL1061 wire because I'm currently building two pairs of speakers and I will be making a min-buy order sometime before the end of the year.
Jazz
Yes, you can avoid a membrane support if the panel width does not exceed 100x d/s.
If you go to the high side of the 70-100 x d/s, then I would apply a high tension on the diaphragm-- let's say 2% elongation if you use 6-micron film.
A 6" wide panel will have a rather high dipole roll off so you would need to set the crossover higher than you suggested, or use a whole of of EQ, or better--- use a wide frame around the panel to increase the effective baffle width (add some wings maybe).
UL1061 or UL1429 single-strand wire in 20awg, spaced at 11 wires per inch would give you ideal open area (43%). The two wires I just named use .009 & 0.010 PVC insulation, respectively, and the wire O.D. is only 0.052 or 0.053, respectively. Whereas; most other UL spec wire uses .016 thick insulation with O.D. is too large to use 11/inch wire spacing. The target for wire spacing should be around 43%.
Unfortunately; UL1061 and UL1429 wire are not generally available in small quantities-- the min buy is typically 10,000 feet! If you IM me, I could probably hook you up with some UL1061 wire because I'm currently building two pairs of speakers and I will be making a min-buy order sometime before the end of the year.
Jazz
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Hi again.
Mattstat.
You right about acustat panel it is very stabil but i dont like the look of the panel and i am allways willing to try a new challenge 🙂
you say you will make the panel narrower, i sad mine will be 6 inch wide but it was the total wide of the panel in fact the menbrane itself will only be 4.3 inch wide and 45 inch high.
CharlieM.
In fact it is actually your videos and and homepage that has inspired me to go the wire stator way, and because of for me the look of audiostatic speakers.
the wide of my panel is only the panel itself they will be mounted in a frame there are around 12 inch wide so the rolloff frequency should be a little lower.
the wire i have on hand have exactly the same size as your wire and are rated 900v ac/dc and high voltage test 2.5kv, here in danmark i can get this wire in 328ft roll for around 28$ but thanks for your offer to buy wire from you🙂 but it will also be expensive and send it to danmark from usa we have very high import taxes here🙁
7 years ago i promise to upload some pictures of my speakers that i build with help from all your guys, sorry i never do that but here there are (better late than never🙂) the 2 woofers in the botton are some old 6 inch mission speakers mounted in a closed box of around 15 litres and they go surprising low and i will use them again, the stators are powder coated.
I will be back if i get problems with the new build, in other words i will be back🙂
LS
Mattstat.
You right about acustat panel it is very stabil but i dont like the look of the panel and i am allways willing to try a new challenge 🙂
you say you will make the panel narrower, i sad mine will be 6 inch wide but it was the total wide of the panel in fact the menbrane itself will only be 4.3 inch wide and 45 inch high.
CharlieM.
In fact it is actually your videos and and homepage that has inspired me to go the wire stator way, and because of for me the look of audiostatic speakers.
the wide of my panel is only the panel itself they will be mounted in a frame there are around 12 inch wide so the rolloff frequency should be a little lower.
the wire i have on hand have exactly the same size as your wire and are rated 900v ac/dc and high voltage test 2.5kv, here in danmark i can get this wire in 328ft roll for around 28$ but thanks for your offer to buy wire from you🙂 but it will also be expensive and send it to danmark from usa we have very high import taxes here🙁
7 years ago i promise to upload some pictures of my speakers that i build with help from all your guys, sorry i never do that but here there are (better late than never🙂) the 2 woofers in the botton are some old 6 inch mission speakers mounted in a closed box of around 15 litres and they go surprising low and i will use them again, the stators are powder coated.
I will be back if i get problems with the new build, in other words i will be back🙂
LS
