I'd just like to mention that I build something like this for myself last year... 4-way active, digital linear-phase x-over (computer software solution). They are big, but dont need a big room. I listen to them at 2 meter distance only.
Drivers are:
2x Beyma 18P1200nd
2x Seas W22EX001
2x Seas W15CH001
1x Mundorf AMT2340
Oh... and here's a picture:
Drivers are:
2x Beyma 18P1200nd
2x Seas W22EX001
2x Seas W15CH001
1x Mundorf AMT2340
Oh... and here's a picture:
An externally hosted image should be here but it was not working when we last tested it.
That looks great, very similar to what I have as my vision for my upcoming build, except JBL2225, 2123 and BMS 4590/2+oblate speriod flare. TH subs below 60Hz. Still sketching and modelling before I get into my mate's workshop to build them.
Do you have any more pics or a link to a thread etc?
Do you have any more pics or a link to a thread etc?
jpetek said:
Driver center to center distance in a line array has to be closer than 1/4 wavelength of the highest frequency to be reproduced, or else you get lobing and comb filtering from this frequency upwards, which will sound horrible.
jpetek said:
With drivers, that are small enough not to produce such effects in a line array, you wont be able to get a maxspl of 120dB with only seven. Besides, seven such small drivers wouldnt even be a line array with their few centimeters in total added length. And to speak of 120dB/w is just a joke, right? Since that is impossible.
I would doubt your designers knowledge, if he doesnt consider such very basic facts. Maybe look for someone who kows what he does.
Below is a picture from my listening room. Its a LEDE room, 35 sq meters.
I can start a new thread about this system. Hang on...
I can start a new thread about this system. Hang on...
An externally hosted image should be here but it was not working when we last tested it.
Dear All,
first I want to build this loudspeaker:
http://www.rockporttechnologies.com/ arrakis.
I have acess to the driver and the crossover.
My problem is do not find anybody which is able to design and build this cabinet. (HDF and Hewaphon).
Maybe anybody knows somebody in Germany?
Josef
first I want to build this loudspeaker:
http://www.rockporttechnologies.com/ arrakis.
I have acess to the driver and the crossover.
My problem is do not find anybody which is able to design and build this cabinet. (HDF and Hewaphon).
Maybe anybody knows somebody in Germany?
Josef
Alright, don't take it the wrong way, but come on: "...the Arakis transcends the boundaries of believability."
But it looks doable, aside from the half-ton swoopy carbon fiber and billet (guessing?) cabinet. I suggest building it in MDF (and concrete) first, and then improving on it later if you still like it.
But it looks doable, aside from the half-ton swoopy carbon fiber and billet (guessing?) cabinet. I suggest building it in MDF (and concrete) first, and then improving on it later if you still like it.
Mind you, Shin had to convert his amazing design from 3way into a 3.5way coupling out one midrange doing midbass only...Shin solved it in his own way, but a minor detail that need to be solved before copying
This is not as straightforward as it may look
Gryphon has some nice designs too...I suppose they use some EQ in bass
http://www.gryphon-audio.dk/default2.asp
This is not as straightforward as it may look
Gryphon has some nice designs too...I suppose they use some EQ in bass
http://www.gryphon-audio.dk/default2.asp
Attachments
Hi,
I have a nodisclosure with the builder of the Line Array. So I cannot tell you which driver we use but it is a driver very close to lowther but from germany...
My first idea was to build the Arrakis. But with the problems of the cabinet I change to the Line Array which is much easier to build.
If I found anybody which can build the cabinet of the Arrakis (in MDF/HDF and Hewaphon inside) perfect but the solution from StogErik looks very nice.
Seems to be a very good system.
regards
Josef
I have a nodisclosure with the builder of the Line Array. So I cannot tell you which driver we use but it is a driver very close to lowther but from germany...
My first idea was to build the Arrakis. But with the problems of the cabinet I change to the Line Array which is much easier to build.
If I found anybody which can build the cabinet of the Arrakis (in MDF/HDF and Hewaphon inside) perfect but the solution from StogErik looks very nice.
Seems to be a very good system.
regards
Josef
I thought money was no object. Cabinets for Arracis could be building by any experienced cabinetmaker. CNC capability would make it a 1 weeks job. 3 days to draw and program, and 2 days to cut parts. Arracis is sold for $34000, meaning the manufacturer gets at list $15000 per pair, Meaning each speaker has a budget of $3500 or less to produce it. Can’t do it without CNC on the commercial bases.
But a week of the well equipped shop can run you how much?
But a week of the well equipped shop can run you how much?
jpetek said:
Drivers: Danish Audiothecnology. (from the "Arrakis" website www.rockporttechnologies.com, not the line arrays)
Hewaphon, is it some molded soft polyurethane foam polyester based?
From the German Physiks site:
Hawaphon.... consists of a polymer sheet containing a matrix of small cells filled with fine steel shot. It adds mass to the panels to reduce the resonant frequency and the ability of the balls in each cell to move against each other provides a very effective way of converting vibrational energy into heat. Originally developed as an anti-surveillance measure for use in military and government buildings, Hawaphon achieves broadband attenuation of structure-borne sound of more than 50dB, a truly remarkable figure. Loudspeaker enclosure panels treated with Hawaphon generate almost no spurious output.
Hawaphon.... consists of a polymer sheet containing a matrix of small cells filled with fine steel shot. It adds mass to the panels to reduce the resonant frequency and the ability of the balls in each cell to move against each other provides a very effective way of converting vibrational energy into heat. Originally developed as an anti-surveillance measure for use in military and government buildings, Hawaphon achieves broadband attenuation of structure-borne sound of more than 50dB, a truly remarkable figure. Loudspeaker enclosure panels treated with Hawaphon generate almost no spurious output.
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