I started with a 4 driver array open backed box, but the vertical sweet spot was tiny, you could get disoriented if you stood up while listening to music.
It would sound like you instantly had a head cold.
This was the inspiration.
I'm not a fan of straight line arrays.
No offence to those who are !!!!!!!!!!
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Shiny distracting speakers.😀
fporegon, norman bates: So if the listener position is @ 3m the radius should less than 3m? To me the the drivers position and their direction is separate issues. One is really about timing and the later is about the off axis response of the individual driver, distribution of power, floor reflection et.c.. Both could be called focus points.
Having a smaller radius kind of make sense. If one move to the side the array appears to be flatter(/bigger radius). If one move 90° off axis it would appear to be completely flat(infinite focus).I don't think I have heard a whizzer, but I frankly don't see the point of them anyway. 😀 It's kind of a like a coaxial driver with a mechanical low pass for the "real" cone? Then one could just as well use real coaxials...
Will stay away from cubes. Was just easier to make in sketchup.
fporegon, norman bates: So if the listener position is @ 3m the radius should less than 3m? To me the the drivers position and their direction is separate issues. One is really about timing and the later is about the off axis response of the individual driver, distribution of power, floor reflection et.c.. Both could be called focus points.
Having a smaller radius kind of make sense. If one move to the side the array appears to be flatter(/bigger radius). If one move 90° off axis it would appear to be completely flat(infinite focus).I don't think I have heard a whizzer, but I frankly don't see the point of them anyway. 😀 It's kind of a like a coaxial driver with a mechanical low pass for the "real" cone? Then one could just as well use real coaxials...
Will stay away from cubes. Was just easier to make in sketchup.
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yup, whizzer is like an appendage that vibrates after the body has been hit.
but whizzer is usually better (phase) than a coax with delayed phase and crossover, in addition to a compression driver exiting to a tube, not a horn or waveguide.
If you do a focused array, I'd have the focus a foot or so behind where your ear is.
but whizzer is usually better (phase) than a coax with delayed phase and crossover, in addition to a compression driver exiting to a tube, not a horn or waveguide.
If you do a focused array, I'd have the focus a foot or so behind where your ear is.
I agree 100% to Norman Bates.
His focussed array was my inspiration too.
This array I build last year
is the best speaker I ve ever heard and owned.
A special feature is that the Vifas are all parallel wired .
Then the 18 chassis per side work like just one very fast fullrange Driver (like AER drivers) without any frequency crossover. The sound is without distortion at any level, has much more body then every other speaker I have heard. Also it is extremly clear, fast, detailled, super natural , relaxed and with extraordinary imaging and dynamics.
I am happy!
More infos:
aktives-hoeren.de • Thema anzeigen - Focussierendes Array
His focussed array was my inspiration too.
This array I build last year
is the best speaker I ve ever heard and owned.
A special feature is that the Vifas are all parallel wired .
Then the 18 chassis per side work like just one very fast fullrange Driver (like AER drivers) without any frequency crossover. The sound is without distortion at any level, has much more body then every other speaker I have heard. Also it is extremly clear, fast, detailled, super natural , relaxed and with extraordinary imaging and dynamics.
I am happy!
More infos:
aktives-hoeren.de • Thema anzeigen - Focussierendes Array
what amps are driving them? any digital correction? What happens with sound if you move to the right or left on your sofa?
good question!
the impedance of the array is about 0.5 Ohms!
The only affordable amp I could find was a vintage McIntosh mc2200 or 2250 which has an output transformer for down to 1 Ohm loads- sound is just great.
Theoretical you can take a conventional amp and combine it with a transformer:
Welter Audio Electronic************************************************************************ Seit 1975
Experiments with series-parallel wiring did not convince me.
For the bass up to 135 Hz I take one (very fast) Eckhorn combined with a digital crossover and digital delay for the arrays.
From 135 Hz up to 20000 Hz I tested the room correction software called "acourate", but
sound is best without any room correction or equalizing.
http://abload.de/img/p1000134v8rw3.jpg
http://abload.de/img/p1000136qdqwy.jpg
The links above show the frequency responce, distortions and the ideal step responce at the listening position.
The IACC is more than 98 %! This means perfect stereo.
Sound changes compared to conventional speakers little more if you move horizontal- not the big problem.
The fullrange fronthorns I had before were much more intolerant.
But: you have to accept that the highs are completely gone if you move up.
And: yes- the sweet spot is well defined:
A significant sound change appears If you move yor head more than 10 cm up or down, 20 cm left or right and 30 cm backwards or forwards.
But if you can accept to stay in this area while listening you get for under 1000$ material costs a holographic sound combined with headphone attributes.
And: I don t know how the arrays sound in an other, less ideal room (with side reflections, which I dont have, because of the diagonal positioning of the speakers).
the impedance of the array is about 0.5 Ohms!
The only affordable amp I could find was a vintage McIntosh mc2200 or 2250 which has an output transformer for down to 1 Ohm loads- sound is just great.
Theoretical you can take a conventional amp and combine it with a transformer:
Welter Audio Electronic************************************************************************ Seit 1975
Experiments with series-parallel wiring did not convince me.
For the bass up to 135 Hz I take one (very fast) Eckhorn combined with a digital crossover and digital delay for the arrays.
From 135 Hz up to 20000 Hz I tested the room correction software called "acourate", but
sound is best without any room correction or equalizing.
http://abload.de/img/p1000134v8rw3.jpg
http://abload.de/img/p1000136qdqwy.jpg
The links above show the frequency responce, distortions and the ideal step responce at the listening position.
The IACC is more than 98 %! This means perfect stereo.
Sound changes compared to conventional speakers little more if you move horizontal- not the big problem.
The fullrange fronthorns I had before were much more intolerant.
But: you have to accept that the highs are completely gone if you move up.
And: yes- the sweet spot is well defined:
A significant sound change appears If you move yor head more than 10 cm up or down, 20 cm left or right and 30 cm backwards or forwards.
But if you can accept to stay in this area while listening you get for under 1000$ material costs a holographic sound combined with headphone attributes.
And: I don t know how the arrays sound in an other, less ideal room (with side reflections, which I dont have, because of the diagonal positioning of the speakers).
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Thank you!
Details:
aktives-hoeren.de • Thema anzeigen - Focussierendes Array
Peerless/ Vifa 9 BN 119/8
It needs at least 50 hours fo burning in.
Details:
aktives-hoeren.de • Thema anzeigen - Focussierendes Array
Peerless/ Vifa 9 BN 119/8
It needs at least 50 hours fo burning in.
This would end up with something I would just keep on experimenting with. I don't think I could make arrays like those and then just stop and be happy. (What if I did this instead of that? What would happen if...)
So one cabinet per driver. But that would mean two walls between each driver instead of one(or possibly zero), but the drivers should be as close as possible, minimizing CC distance.
So one cabinet per driver. But that would mean two walls between each driver instead of one(or possibly zero), but the drivers should be as close as possible, minimizing CC distance.
Attachments
I don't see why not.
I thought of doing the multiple box array with 4 or 5 x 12" drivers.
Maybe you can put hinges on the front to connect the boxes so they don'the walk.
I thought of doing the multiple box array with 4 or 5 x 12" drivers.
Maybe you can put hinges on the front to connect the boxes so they don'the walk.
Concave array focus
Keep in mind that I did not do full range arrays - only mid bass cabinets were concave.... I chose to start with a focal length of 2X my listening position. 6 x 5.25" (2500 Hz fmax) drivers for L/R and 9 x 3.5" drivers (4000 Hz fmax) for the center. The height of each array fit inside the 45" vertical window of an AT theater screen. So this did not amount to much curvature...yet it made a very obvious difference. I never experimented with a shorter focal length (more curvature) or tilted drivers as it became obvious to me that I was ultimately heading in a different direction that would eliminate the mid bass cabinets altogether.
So I would take advice about focal length from folks who have done full range arrays over my advice.
Keep in mind that I did not do full range arrays - only mid bass cabinets were concave.... I chose to start with a focal length of 2X my listening position. 6 x 5.25" (2500 Hz fmax) drivers for L/R and 9 x 3.5" drivers (4000 Hz fmax) for the center. The height of each array fit inside the 45" vertical window of an AT theater screen. So this did not amount to much curvature...yet it made a very obvious difference. I never experimented with a shorter focal length (more curvature) or tilted drivers as it became obvious to me that I was ultimately heading in a different direction that would eliminate the mid bass cabinets altogether.
So I would take advice about focal length from folks who have done full range arrays over my advice.
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