OB Project Design Started, Help Requested.

[DQ828]

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

· Bass: Well this is where it gets tricky, I don’t want to use the 15” bass drives, because of my design & to reduce bulk, but I am having little luck finding smaller drivers (10” if necessary 12”) that are efficient, (95-98dB) & have a usable range to get me down to the 20Hz. The following are what I have found so far.

o BMS 12N630 - 12"- 600 W - 4.1Kg - 96 dB 1W/1M-25-300Hz
Neodymium, these pretty much meet the bill but as you will see, in
the design I MUCH prefer, the side pieces, obscures the speakers, which
I assume will have a very bad effect on the sound?
What do you think?

o Eminence DELTA LITE II 2510 - 10" WOOFER, the sensitivity is
good, 97.3dB but the frequency range is way off, 60Hz-4kHz, I have
read that by having the dual speakers in a U/H frame, can increase the
dB & lower the Hz, but getting to 20Hz I think I would need a miracle,
what do you think? And of course they are still slightly obscured by the
sidepieces.

oAny ideas on suitable speaker’s guys?

o Has anyone used the BMS speakers?

Baffle: As you will see my baffle isn’t flat, what do you think?

Crossover Frequencies:
o Bass: Probably somewhere between, 150 & 200 Hz
o Mid: Probably somewhere between, 4 & 5 kHz

The pictures may be decieving, as they are all the same height. the least preffered is wider, the only difference between the other two is bass drivers size, 10" & 12"

[DQ828]

The top & back view of the wider speaker.

[Helmuth]

I ask my self how do you choose your woofer for a open baffle.

Speakers for open baffle prefer to have high qes and qts. value's around 0,5-1 and low Fs is a good indication.

A good high efficient woofer is a eminence kilomax. Or a beyma sn118.
http://profesional.beyma.com/pdf/SM-118%20NE.pdf

[Helmuth]

18 sound nice one
15W500 - LF Ferrite Driver

ciare
http://www.speakerstore.nl/luidsprek...pdf/12.64W.pdf


P-audio
http://www.paudio.ru/downloads/TM12.pdf

[Helmuth]

B&C
B&C SPEAKERS

[Helmuth]

Selenium
http://www.selenium.com.br/site/asse..._pdfManual.pdf

This one is super. nice down to 40Hz.
http://www.selenium.com.br/site/asse..._pdfManual.pdf

http://www.selenium.com.br/site/asse..._pdfManual.pdf

cool modern driver with high Q. Great qaulity for PA OB driver.
http://www.selenium.com.br/site/asse..._pdfManual.pdf

12 inch
http://www.selenium.com.br/site/asse..._pdfManual.pdf

[Helmuth]

And this one looks good to!

[Helmuth]

This one is great I want it my self

xmax motor 1mm mechanical 18mm This is a shame it is use full with restrickted low end or low power 95dB.

simultation openbaffle 2phi.

[Helmuth]

The selenium drivers have good Q for OB. Only poor Xmax for OB.

This one is better 3mm. shout do up to 100dB.

[DQ828]

Hi Helmut

Thanks for all of your input, much appreciated

I have read conflicting information on the Qts side of things, yes I have read lots where they highly recommend a high Qts, but Lukasz recommends a 0.35, which is what I believe the altec 15" 416 8B I'm using at the moment is & it sounds great. I had one eye on the Qts but couldmn't get all of the ducks to line up so to speak. dB, SPL & qts.

I will have a look at the drivers you recommend.

What do you think about the baffle shape & the obscuring of the speaker?