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Old 20th January 2011, 11:16 AM   #11
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That would probably be http://www.topsoundhifi.dk.

I also found this "beginner-friendly project": My 'Volks-OB' Mission Accomplished. Only the designer seems to point out that NO CHANGES can be made to the baffle...
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Old 20th January 2011, 11:20 AM   #12
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Topsoundhifi even have a demo set of the R909 on sale: HIFI4ALL.DK | Tilbudsavisen | JAMO R-909

Only DKK 30.000 or EURO 4.000 or $ 5.5000 each. :|
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Old 20th January 2011, 10:25 PM   #13
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You will need a subwoofer for this one,
recommended crossover frequency is 80Hz,
6db/octave rolloff for the dipol 08 satelites and
an effective acoustical 18db/octave rolloff
for the subwoofer(s) at minimum.

Dipole subwoofers are recommended, a monophonic
(but dipole) subwoofer is also possible, covering the
range from about 35 to 80 Hz.

The subwoofer should be free from resonances/irregularities
up to 300Hz.

"Dipol 08" Baffle Dimension and List of Crossover Parts
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Last edited by LineArray; 20th January 2011 at 10:44 PM.
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Old 23rd January 2011, 09:25 PM   #14
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Depends on whether you like the sound of the bass drum. If it is dispensable, you have lots of choices. If it is not, you can't easily* go OB.

Quite a stretch (in a literal sense) to get low notes from an OB even driving it nuts with Linkwitz-sized, Doppler-distortion engendering EQ.

*Does "easily" sound like a 3 x 5 foot sheet of MDF in your music room? In the odd event that it does, you can make a giant OB, like I did. Far better below 40 Hz than my Klipshorn and pretty good above too, in a small room.
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Last edited by bentoronto; 23rd January 2011 at 09:29 PM.
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Old 26th January 2011, 09:43 AM   #15
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Hi all,

Thanks a lot for your inputs. Diving in to the world of OB does sound a bit more complicated than I originally thought.

A kind soul has offered me to listen to his Emerald Physics CS2 and I think I'll try to do that sometime soon to get a better sense of what to expect from en OB speaker. Especially concerning bass response.

I did do a quick mockup/adaptation of the NoBox BB (perhaps using an Eminence Aplha 15A instead) parts for a R909 baffle. Notice the "bass tube" - I was thinking of making this "adjustable" as to better be able to tune the bass response to the room. The baffle is tilted back by 5 degress. The baffle dimensions are exactly those of the NoBox BB. I also think the speaker would need a tweeter as I like sparkling highs.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Last edited by gumleguf; 26th January 2011 at 09:46 AM.
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Old 26th January 2011, 11:32 AM   #16
adason is offline adason  United States
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looks ok, but if you besides the sparkling heights (tweeter) like deep solid bass, you might need subwoofer
did you look at Dick Olshers basszilla?
Black Dahlia Acoustics - Loudspeaker Kit Plans
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Old 26th January 2011, 11:47 AM   #17
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I know we don't all share the same taste (which is good!), but I really don't find this look very sexy for a speaker:

Click the image to open in full size.

Most OB's I have seen are very "experimental" to look at (I do appreciate that many are "under development"...).

My primary focus is of course sound quality but I have to take the WAF into consideration as well...
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Old 26th January 2011, 12:00 PM   #18
adason is offline adason  United States
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Quote:
Originally Posted by gumleguf View Post
but I really don't find this look very sexy for a speaker:
neither do I, but its completely up to the speaker builder how he does it
here is more of basszilla types, some better than others
Tip_45
just personal note, I would rather have ugly good sounding speakers than nice looking bad sounding ones
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Old 26th January 2011, 12:05 PM   #19
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True, but if the result was an ugly good sounding speaker it wouldn't survive 2 hours in my house, and then what would be the point in building...?

PS. THIS I almost like:

Click the image to open in full size.
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Old 26th January 2011, 12:08 PM   #20
Eric is offline Eric  United States
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Have a look at the Avro dipole speaker project in my signature line. It was developed by the guys over at Home Theater Guide. The project is fully developed and the resulting speakers sound just amazing!

Eric
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