HAY THERE
First intro - My name is jay, i wish to build a speaker and hope with fellow users i will be able to do so
. i have done some research (nothing to heavy) i have been reading a few good books i have seen people speak about such as:
Audio power amplifier design handbook by Douglas self
The Design of Active crossovers by Douglas Self
The Loudspeaker design cookbook
loudspeakers for music and production.
I am wanting to build sphere shaped speaker enclosures which i know has a lot of debate surrounding them but that's what i want lol
I do intend to use them as studio monitors and would like to make them compete with the SE Munro EGG, yes ambituios i know, this is for my dissatation so it has to be amazing.
I have these Drive units in mind (speakers/cones - whatever you wish to call them)
Monacor - DT-25N (pdf attached with specs)
Monacor - SPH130AL (pdf attached with specs)
This is down to frequency response and the looks it will give, i wanted to use a white woofer to get that NS10 look, and the DT-25 tweeter to mimic SE EGG.
With my enclosure for the woofer, i worked out that a 4inch needs approx 0.25 to 0.39 cubic feet of volume within the enclosure. Because the frequency response of the SPH130AL is so low at the low end i am hoping that by using a small enclosure with a port will just boost the bottom end??? i hope i am right on that one. the volume i actually require using 0.25cubic feet as a reference this comes to 432cubic inches, giving me a radius of 4.69 ices for the sphere enclosure. I plan on using GRP to Make the enclosure with support struts and a metal mesh. Like if you take a football and but the struts around that then apply the mesh round that struts then by using the paste on top if the mesh, the allowing it to dry, then by deflating the ball/object inside the casing and pulling it out where the driver unit will sit then using the paste on the inside. then when all is dry and good using a bit of elbow grease and wet and dry sandpaper sand it down to a smooth finish. I know Spheres also generate internal reflections so when i have the electronics done (hopefully with your help) i will find out what sound is making it honk or tweet and treat it accordingly.
Now with the enclouser delt with its the electronic designs i am confused and bewildered by such as a transformer,power amplifier, and crossover.
Now i wish to make it an active crossover utilizing a 6th order linkwitz riley design. I went over to 2-Way Crossover Designer / Calculator
and this is what i got
6th Order Linkwitz-Riley
2000 Hertz
8 Ohm Tweeter / 8 Ohm Woofer [IMGDEAD]http://www.diyaudioandvideo.com/Calculator/XOver/circuit6.gif[/IMGDEAD] Parts List
Capacitors
C1 = 5.53 uF
C2 = 6.76 uF
C3 = 13.68 uF
C4 = 18.42 uF
C5 = 11.14 uF
C6 = 2.49 uF
Inductors
L1 = 0.34 mH
L2 = 0.57 mH
L3 = 2.55 mH
L4 = 1.15 mH
L5 = 0.94 mH
L6 = 0.46 mH
So that's telling me the right stuff, but i would also like to make this as flat as possible. so I am guessing i would also need to place a bandpass filter over the top of the crossover which is where I need help. Because i could build that simple enough, but its the Amplifier, turning this into an active crossover, adding a low filter boost with volume nob and then building the transformer so i can plug in my active crossover to a mains 240v, I don't plan on having the electronic boards in with sphere but a stand alone unit. connected like a normal studio monitor balanced jack plug or xlr I may use a newer connection system.
Please Can some one help me design this, I know its a lot to ask but a few bits are lost on me with the books and dose not say use this to get this result lol.
this as i said is my dissertation work and wish for it to over top the markers expectations and to challenge the SE EGG
btw i am still reading the books
in hope i can have my light bulb moment but still think a little guidance is needed.
Thank you for reading I hope you will and can help. J
First intro - My name is jay, i wish to build a speaker and hope with fellow users i will be able to do so
Audio power amplifier design handbook by Douglas self
The Design of Active crossovers by Douglas Self
The Loudspeaker design cookbook
loudspeakers for music and production.
I am wanting to build sphere shaped speaker enclosures which i know has a lot of debate surrounding them but that's what i want lol
I have these Drive units in mind (speakers/cones - whatever you wish to call them)
Monacor - DT-25N (pdf attached with specs)
Monacor - SPH130AL (pdf attached with specs)
This is down to frequency response and the looks it will give, i wanted to use a white woofer to get that NS10 look, and the DT-25 tweeter to mimic SE EGG.
With my enclosure for the woofer, i worked out that a 4inch needs approx 0.25 to 0.39 cubic feet of volume within the enclosure. Because the frequency response of the SPH130AL is so low at the low end i am hoping that by using a small enclosure with a port will just boost the bottom end??? i hope i am right on that one. the volume i actually require using 0.25cubic feet as a reference this comes to 432cubic inches, giving me a radius of 4.69 ices for the sphere enclosure. I plan on using GRP to Make the enclosure with support struts and a metal mesh. Like if you take a football and but the struts around that then apply the mesh round that struts then by using the paste on top if the mesh, the allowing it to dry, then by deflating the ball/object inside the casing and pulling it out where the driver unit will sit then using the paste on the inside. then when all is dry and good using a bit of elbow grease and wet and dry sandpaper sand it down to a smooth finish. I know Spheres also generate internal reflections so when i have the electronics done (hopefully with your help) i will find out what sound is making it honk or tweet and treat it accordingly.
Now with the enclouser delt with its the electronic designs i am confused and bewildered by such as a transformer,power amplifier, and crossover.
Now i wish to make it an active crossover utilizing a 6th order linkwitz riley design. I went over to 2-Way Crossover Designer / Calculator
and this is what i got
6th Order Linkwitz-Riley
2000 Hertz
8 Ohm Tweeter / 8 Ohm Woofer [IMGDEAD]http://www.diyaudioandvideo.com/Calculator/XOver/circuit6.gif[/IMGDEAD] Parts List
Capacitors
C1 = 5.53 uF
C2 = 6.76 uF
C3 = 13.68 uF
C4 = 18.42 uF
C5 = 11.14 uF
C6 = 2.49 uF
Inductors
L1 = 0.34 mH
L2 = 0.57 mH
L3 = 2.55 mH
L4 = 1.15 mH
L5 = 0.94 mH
L6 = 0.46 mH
So that's telling me the right stuff, but i would also like to make this as flat as possible. so I am guessing i would also need to place a bandpass filter over the top of the crossover which is where I need help. Because i could build that simple enough, but its the Amplifier, turning this into an active crossover, adding a low filter boost with volume nob and then building the transformer so i can plug in my active crossover to a mains 240v, I don't plan on having the electronic boards in with sphere but a stand alone unit. connected like a normal studio monitor balanced jack plug or xlr I may use a newer connection system.
Please Can some one help me design this, I know its a lot to ask but a few bits are lost on me with the books and dose not say use this to get this result lol.
this as i said is my dissertation work and wish for it to over top the markers expectations and to challenge the SE EGG
btw i am still reading the books
Thank you for reading I hope you will and can help. J