Ignorance is bliss, so I must be in bliss.
I will attempt to turn a 4" and a 8" carbon fiber woofer into a 4" and 8" full range drivers.
Gjee Whizzers.
Almost reaching as high as 10khz, they just have another 10 to go.
I expect what ever I do shall suffer beaming or shouting issues, so I also plan to incorporate some sort of blocker/diffuser into the final design. I imagine a sphere or half-sphere hovering over the cone/whizzer area.
Much to my surprise the CF drivers are very dry and paper-like. There is very little resin on them. So little resin in fact that part of my design may be to add epoxy resin to either the front or back and stiffen it up. Which in turn should raise the frequency response, be it at perhaps a more jagged or peaky level.
If you want to hold your opinion until after I do things, that is fine. I do plan to experiment on a big cardboard box full of spare drivers before touching the CF drivers I actually spent money on and not found on the curb when the college students moved out of town last spring.
Anyway here is the MCM 4" and 8" carbon fiber drivers selling for what I think is a fair price. All I can say about MCM is that one of my $6 back-up tweeters I bought in case I fail at producing a super whizzer came in damaged from shipping. I called them and they are mailing me a new one - just like that.
Pictures: Yes that is a vented pole piece on the 8" driver, just like the big boys have.
8"
4"
Both
Poor little tweeter.................
I'm not sure, but I think that the light coming through the drivers is actual air hole openings in the CF weave, and not just translucent resin. I will take a close look when I have more time. Somehow this just feels wrong, I'm open to hearing your opinions on this as it could be not normal.
I hooked them up and they play, only did low levels for a few short minutes but already have some first impressions "in free air".
1. The 8" driver has a rich deep sound and nice fast bass, but I will be hard pressed into converting this into a full-range unit. Vocals are good, bass has depth, just no zing at the top end "as is".
2. The 4" driver lacks the large uncongested openness of the 8" driver but should be a breeze to convert the upper frequencies. Vocals are there, not as rich as the larger driver though.
3. I also hooked up the tweeters to test them, they are not very efficient compared to the sound levels at the same location on the volume control. It will be interesting trying to match sound levels with the mid-woofers, if I go that route as a last resort.
Link to CF drivers below (the top two), PDF's in link provide frequency response charts.
Search results for "mcm die cast woofer 55-3*"
That is all, except you might want to see the Whizzer Thread where I posted some research images and links.
http://www.diyaudio.com/forums/full-range/180690-whizzer-thread.html
I will attempt to turn a 4" and a 8" carbon fiber woofer into a 4" and 8" full range drivers.
Gjee Whizzers.
Almost reaching as high as 10khz, they just have another 10 to go.
I expect what ever I do shall suffer beaming or shouting issues, so I also plan to incorporate some sort of blocker/diffuser into the final design. I imagine a sphere or half-sphere hovering over the cone/whizzer area.
Much to my surprise the CF drivers are very dry and paper-like. There is very little resin on them. So little resin in fact that part of my design may be to add epoxy resin to either the front or back and stiffen it up. Which in turn should raise the frequency response, be it at perhaps a more jagged or peaky level.
If you want to hold your opinion until after I do things, that is fine. I do plan to experiment on a big cardboard box full of spare drivers before touching the CF drivers I actually spent money on and not found on the curb when the college students moved out of town last spring.
Anyway here is the MCM 4" and 8" carbon fiber drivers selling for what I think is a fair price. All I can say about MCM is that one of my $6 back-up tweeters I bought in case I fail at producing a super whizzer came in damaged from shipping. I called them and they are mailing me a new one - just like that.
Pictures: Yes that is a vented pole piece on the 8" driver, just like the big boys have.
8"
4"
Both
Poor little tweeter.................
I'm not sure, but I think that the light coming through the drivers is actual air hole openings in the CF weave, and not just translucent resin. I will take a close look when I have more time. Somehow this just feels wrong, I'm open to hearing your opinions on this as it could be not normal.
I hooked them up and they play, only did low levels for a few short minutes but already have some first impressions "in free air".
1. The 8" driver has a rich deep sound and nice fast bass, but I will be hard pressed into converting this into a full-range unit. Vocals are good, bass has depth, just no zing at the top end "as is".
2. The 4" driver lacks the large uncongested openness of the 8" driver but should be a breeze to convert the upper frequencies. Vocals are there, not as rich as the larger driver though.
3. I also hooked up the tweeters to test them, they are not very efficient compared to the sound levels at the same location on the volume control. It will be interesting trying to match sound levels with the mid-woofers, if I go that route as a last resort.
Link to CF drivers below (the top two), PDF's in link provide frequency response charts.
Search results for "mcm die cast woofer 55-3*"
That is all, except you might want to see the Whizzer Thread where I posted some research images and links.
http://www.diyaudio.com/forums/full-range/180690-whizzer-thread.html
