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Old 16th October 2010, 10:30 AM   #101
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by DQ828 View Post
My previous OB was a direct copy of Lukasz Frikas P17, which are the best sounding speakers I have ever heard, (not that I have a lot of experience) but they are NOT the best speakers I have ever seen, that’s an understatement.

My goals for the next design are:
1. Aesthetically pleasing, at least to me anyway.
2. Less bulky than the P17’s
3. Highly efficient.
4. Flat as possible 20Hz to 20KHz
5. Passive in the first instance, then possible converted to Active, should I ever figure out how to do that.
6. 3 way.

Proposed Speakers:

· Tweeter: Raal 140-15d, I know this is a Tweeter-Mid, but I have faith in Lukasz speaker recommendations after the P17.

· Mid: Either Saba 8” Green cone or Isophon Oval as in Lukasz P24, if I can find any that is, the Saba’s sound great, IMO
Why isn't the tweeter a dipole.

Like the B&G Neo 3 dipole and low price.
Click the image to open in full size.
Bohlender Graebener Neo3W Planar Tweeter w/Back Cup | Parts-Express.com
Bohlender Graebener Neo3 Flush Mount Faceplate Pair | Parts-Express.com

Alternative to saba green cone the low distorsion visaton b200.
Click the image to open in full size.
http://www.visaton.de/en/chassis_zub...nd/b200_6.html
Dipole with b200 here you can find also filter details for the b200
Click the image to open in full size.
http://www.visaton.de/en/bauvorschla...xbb/index.html

Or use a AL170 like keyser did a very nice driver.
Click the image to open in full size.
http://www.visaton.de/en/chassis_zub...n/al170_8.html
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Last edited by Helmuth; 16th October 2010 at 10:41 AM.
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Old 16th October 2010, 10:31 AM   #102
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by Helmuth View Post
The baffle that you did design can easy hide a 18" behind is and then it is not a big problem to keep the opening for the cone 12" wide and 18" high. So what concerns dimensions you do not have to change your design.

Correction maybe make the opening wider 11-14 inch. Or make the opening round where the woofer is located.

Designing is often about making compromises DQ828.
Click the image to open in full size.
Click the image to open in full size.
Been busy re gearing (slowing down) an industrial sewing machine today, so I can get on with my upholstery project I have been putting off for 10 years.

The design you have shown has a 8" opening, it is the design I like the most, but yes I will play with the design.

The other problem with 18" drivers is getting them here. the 15" Altecs only just make Australia Post standard postage size, If I have to go away from Australia Post (AP) on this end (ie USPS send it to AP and they deliver it) the already excessive postage goes thru the roof.

If any aussie knows of a way around this let me know.
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Old 16th October 2010, 10:36 AM   #103
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by Helmuth View Post
The Raal has rave reviews, Lukasz seemed to think it worked fine without being dipole & I have seen a number of designs not using a dipole tweeter.
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Old 16th October 2010, 10:44 AM   #104
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by DQ828 View Post
The other problem with 18" drivers is getting them here. the 15" Altecs only just make Australia Post standard postage size, If I have to go away from Australia Post (AP) on this end (ie USPS send it to AP and they deliver it) the already excessive postage goes thru the roof.

If any aussie knows of a way around this let me know.
Witch prodrivers are easy available in Australia?

Can be to difficult to find a other.
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Old 16th October 2010, 11:10 AM   #105
Helmuth is offline Helmuth  Netherlands
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Maybe BMSPRO?

BMS 15S330 nice driver xmax 8mm. Athough the Altec is hard to beet it is a very good choice for a OB.
Thiele-Small
Attached Images
File Type: jpg 15s330.JPG (38.3 KB, 20 views)
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Old 16th October 2010, 11:20 AM   #106
Helmuth is offline Helmuth  Netherlands
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What did I say altec hard to beat? This 18" is perfect.
BMS pro 18s430v2 within xmax up to 110dB incredible!
Click the image to open in full size.
Thiele-Small
Attached Images
File Type: jpg bms18.JPG (40.2 KB, 68 views)
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Last edited by Helmuth; 16th October 2010 at 11:35 AM.
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Old 16th October 2010, 11:44 AM   #107
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by Helmuth View Post
Maybe BMSPRO?

BMS 15S330 nice driver xmax 8mm. Athough the Altec is hard to beet it is a very good choice for a OB.
Thiele-Small

Any idea why the 12" BMS didn't measure well?

I have recently discovered the pricing I was looking at for the BMS was way out of date & the supplier didn't even know he still had a Ebay store with all of this out of date info on it.
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Old 16th October 2010, 11:51 AM   #108
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by Helmuth View Post
What did I say altec hard to beat? This 18" is perfect.
BMS pro 18s430v2 within xmax up to 110dB incredible!
Click the image to open in full size.
Thiele-Small
By the way what speakers are you listerning to? any links to photos?
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Old 16th October 2010, 11:54 AM   #109
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by Helmuth View Post
What did I say altec hard to beat? This 18" is perfect.
BMS pro 18s430v2 within xmax up to 110dB incredible!
Click the image to open in full size.
Thiele-Small
A fault enterd the simulation, with a wrong Re I had simulated.

Here the corrected simulation. still great even better spl.
Attached Images
File Type: jpg bms18.JPG (39.0 KB, 46 views)
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Old 16th October 2010, 12:21 PM   #110
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by DQ828 View Post
By the way what speakers are you listerning to? any links to photos?
PA bandpas
Click the image to open in full size.
horn almighty
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stereo measurement horn almighty
Click the image to open in full size.
bookshelf BR cut of 30Hz! And classic reciever build 1975-78
Click the image to open in full size.
A very good sounding dáppolito bandpass fatboy I sold them recently. And my classic Vfet WEGA(sony)4810(5650) and reciever. In my own build audio furnature in the same wood as the fatboy.
Click the image to open in full size.
Project presentation Horn Almighty
High-end 3 way dáppolito with aluminiumcone
V-fet Repair of a WEGA V4810 solid state heaven
big bandpass The fatboy
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Active two way backloaded horn with titanium tweeter and midwoofers. build in 2000.
Click the image to open in full size.

I am building a class -d 2x180W amplifier so I can tune my latest design MONITOR-xl to highest level. This is the one I am listening to at the moment and Horn-almighty.

This measurement is done with a Yaqin mc10l tube amplifier so not ideal.
Click the image to open in full size.

My first speaker was a karlson 3 way with horn.

Class D amp.Click the image to open in full size.
specs Click the image to open in full size.
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recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

Last edited by Helmuth; 16th October 2010 at 12:31 PM.
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