[nvrgdenuf]

You will notice similarities to a couple of designs. Haven't finished the base plates yet, Started taking measurements. Things sound promising. So far no dsp or x-over to the 12cx and a simple 2.0 claritycap to the DE10. The Alpha amp is a WF 100k x-over at 100hz.
Gonna mess with the felt pads and maybe add some boost in the plate amp. Opinions on frequency and boost amount? Thinking 6db about 50hz? Its a resistor change. I would so like to keep it simple and keep my dcx 24/96 out of this.
thanks

[nvrgdenuf]

Just the 12cx

add Alpha 15a

add DE10

[dgator]

You will notice similarities to a couple of designs. Haven't finished the base plates yet, Started taking measurements. Things sound promising. So far no dsp or x-over to the 12cx and a simple 2.0 claritycap to the DE10. The Alpha amp is a WF 100k x-over at 100hz.
Gonna mess with the felt pads and maybe add some boost in the plate amp. Opinions on frequency and boost amount? Thinking 6db about 50hz? Its a resistor change. I would so like to keep it simple and keep my dcx 24/96 out of this.
thanks

I like it. What is the hole size in front of the 15a and how did you determine it?

Is the de10 you mention a B&C horn driver with no horn?

Does the 12cx need it? How does it work without a horn? thanks,

[nvrgdenuf]

dgator,
baffle hole is 6inch x 1/2 depth before the flare. Size estimated by pictures of the design of someone else, then simulated in winalpha.
The De10 is the B&C simply using a small horn (the Baffle design), where a larger horn would have increased its sensitivity and lowered the x-over capabilities, of which neither I needed. The middle response is the natural roll-off of the 12cx. The last is with the DE10 added.
I really like the tweeter, as it has none of the harshness associated with titanium or other metal tweeters, and thus non-fatiguing.
Measurements taken with the ECM8000, a calibration file, and HolmImpulse software. (thanks, HolmAcoustics)

[Jtoivonen]

dgator,
baffle hole is 6inch x 1/2 depth before the flare. Size estimated by pictures of the design of someone else, then simulated in winalpha.
The De10 is the B&C simply using a small horn (the Baffle design), where a larger horn would have increased its sensitivity and lowered the x-over capabilities, of which neither I needed. The middle response is the natural roll-off of the 12cx. The last is with the DE10 added.
I really like the tweeter, as it has none of the harshness associated with titanium or other metal tweeters, and thus non-fatiguing.
Measurements taken with the ECM8000, a calibration file, and HolmImpulse software. (thanks, HolmAcoustics)

Have you modified the Beta 12 cx in any other way than adding those felt pads? Unmodified unit has quite nasty peak around 2 khz and your measurements look really smooth around 2k..

[nvrgdenuf]

Violin oil compared to c37. One light coat on whole front, and one about 60% from suspension towards dust cap, done about 2 weeks later. There is no x-over or eq on the 12cx. No other mods. A single ClarityCap 1.8mfd on the DE10 tweeter. Beating on them now and wil do some more measurements this weekend to see if break-in amounts to anything.
Acoustics instruments and pianos are so much better than any store boughts I've ever had. Listening to Eagles Hell Freezes Over DVD. Lots of Orchestra, drums and instruments individually highlighted. Just fantastic.
I plan to mess with the felt pads a little. These are 1inch very low cut. I would like to try a real wool felt a taller, just for experimentation.

Int'l Violins is where I got my lacquer

[Jtoivonen]

Violin oil compared to c37. One light coat on whole front, and one about 60% from suspension towards dust cap, done about 2 weeks later. There is no x-over or eq on the 12cx. No other mods. A single ClarityCap 1.8mfd on the DE10 tweeter. Beating on them now and wil do some more measurements this weekend to see if break-in amounts to anything.
Acoustics instruments and pianos are so much better than any store boughts I've ever had. Listening to Eagles Hell Freezes Over DVD. Lots of Orchestra, drums and instruments individually highlighted. Just fantastic.
I plan to mess with the felt pads a little. These are 1inch very low cut. I would like to try a real wool felt a taller, just for experimentation.

Int'l Violins is where I got my lacquer

Ok! Thanks alot. For sharing that info 
Did you also apply lacquer to the dust cap or just the cone? And that other coat is applied to the inner 40% of the cone (closest to the voicecoil)? Lucky for me there's a violin maker just few hundred meters from my frontdoor.. Interesting to see what he says when I'll tell where I'm going to use that lacquer 

[nvrgdenuf]

No on the dust cap, leave it alone. Bastani has a sticker that covers the coaxial driver hole on the back of the 12, but I found no difference open or closed while measuring.
I did the outer 60% on 2nd coat of lacquer, per Bastani forums.
On the Diyaudio forum there is an active similar thread, but he has made a mess of the speakers and taken no measurements. The last item discussed is something I have pondered though. Music "body" is the suggested term and I will try to describe relating to my sense of that. Besides all the positive attributes of the open baffle, there is a difference in sound (obviously) compared to a box speaker. But I "feel" that sound that they refer to as "body" is the coloration of the box. Especially with ported enclosures. Ever put your ear close to a port while playing? Awful sounding. I think a "House curve" on an eq giving more mid-bass would satisfy his "body" though.
Last night I spent some time comparing CPLAY with the ASIO4ALL drivers at 24/96 to Foobar with the Windows drivers. The Hi-Res playback was immediately noticeable even to my son, who commented the Foobar playback sounded muffled after listening to the Hi-res.
My next purchase will be the Musiland 02 USB.

[Angaria]

What is your logic on the small ported front enclosure for the 15a?

[nvrgdenuf]

 First reason is following the ideas of the CS2.3 speaker. As per discussions on this board and others, it was thought to increase the power handling and 'lengthen' the path before the front/rear wave meet and hopefully reduce some dipole cancellation. Otherwise there would be a very short distance between the two, using a 15" driver and 15.75" wide baffle.
 Second reason kinda looks cool.
 More measurements (especially on the alpha front/rear) and some experimenting to come soon.
 The bass is definitely there though. I can tell the Alphas are getting broken in some and becoming better refined. (more pronounced)

[Angaria]

Makes sense, cool idea, thanks!

[nvrgdenuf]

 FRom seated position with DEQ2496,digital in/out.




The limiting factor is the bass if you try to get after it with  bass heavy material. The Alphas will give it up. Bastani uses a sealed lower cabinet, but I would want something to work well within 1-1.25^3 sealed. The Peerless SLS I looked at needs about 3.0^3. A sealed 12" is the direction I am looking though. Someone is using (4) Goldwoods per side which might be cool. So many ooptions to try!
Of course the CS2.3 uses (2) Alphas.
The AcousticElegance 15 Dipole looks sweet, but not the $700 to get them to my door.

[xecluded]

Can I ask where do you buy the horns for this project from. Thanks.

[nvrgdenuf]

 Hey Xecluded,
 The only horn here would be the  baffle flare in front of the DE10. The straight portion of the flare,(closest to the tweeter exit) is .5 inch deep, and the the flare is at a 45 degree from there  to the baffle face.

[Angaria]

What material did you use to form the circular semi-enclosure for the 15a?  Thanks.

[xecluded]

Hey Xecluded,
 The only horn here would be the  baffle flare in front of the DE10. The straight portion of the flare,(closest to the tweeter exit) is .5 inch deep, and the the flare is at a 45 degree from there  to the baffle face.

Got you nvrgdenuf.  Thanks.

[nvrgdenuf]

 The whole baffle is made from 1 1/8 inch butcher block, with the Alpha chamber adding two additional pieces, for a thickness of 3 3/8 inch. I think the baffle plus one (instead of two) would have been sufficient though.

[freddyi]

fabulous response from the system and your 12CX  - regarding the 60% figure coming inwards from the surround, how large diameter of an inner circle does this leave to make the job easier to envision?  (HolmImpulse looks great)