All open baffle expert, welcome
I have a dream : build a big 3way open bafle system
Why 3 way? because from experience, it's more difficult to crossover in the 100-5000Hz region.
- Bass-100Hz : 2 or 4 15" in lml or llmll configuration
- 100-5000Hz : one 7" to 10"
- Tweeter or coax with medium
On something like 50cm (20") wide panel.
Active filter with eq for bassloss and eventualy for medium (ideally not but with a 50cm wide baffle, I think it's difficult for the medium to reach 100Hz, but maybe with a high Qts....)
But which driver to use, what's for you the best unit for each frequency band?
And for the medium, I don't like too much the bicone fullrange for a directivity question, but do you think a coax can do a very good job in this configuration???
All is open, just put your opinion....
Thanks
Hugues
I have a dream : build a big 3way open bafle system
Why 3 way? because from experience, it's more difficult to crossover in the 100-5000Hz region.
- Bass-100Hz : 2 or 4 15" in lml or llmll configuration
- 100-5000Hz : one 7" to 10"
- Tweeter or coax with medium
On something like 50cm (20") wide panel.
Active filter with eq for bassloss and eventualy for medium (ideally not but with a 50cm wide baffle, I think it's difficult for the medium to reach 100Hz, but maybe with a high Qts....)
But which driver to use, what's for you the best unit for each frequency band?
And for the medium, I don't like too much the bicone fullrange for a directivity question, but do you think a coax can do a very good job in this configuration???
All is open, just put your opinion....
Thanks
Hugues
I'd look at existing OB projects to see what drivers they use.
Martin King has an OB project on his site with a lowther driver and 15" bass augmentation. http://www.quarter-wave.com/Project07/Project07.html
The is, of course the Phoenix and the Orion from Linzwitz's site. http://www.linkwitzlab.com/
The NaO Mini is similar to what you want. http://www.musicanddesign.com/NaOMini.html
The Visaton B200 is also very popular in OB.
Martin King has an OB project on his site with a lowther driver and 15" bass augmentation. http://www.quarter-wave.com/Project07/Project07.html
The is, of course the Phoenix and the Orion from Linzwitz's site. http://www.linkwitzlab.com/
The NaO Mini is similar to what you want. http://www.musicanddesign.com/NaOMini.html
The Visaton B200 is also very popular in OB.
Hugues,
IMHO you shouldn´t cling to a 100 Hz crossover frequency that much. If you x-over at 200-300 Hz, a 50 cm baffle will easily be large enough to stay above the baffle step for the mid driver. So no eq needed there.
The Jordan JX 92S would probably be an excellent candidate for medium/high duties.
I don´t see any advantage in a "lml or llmll configuration". llm would be my choice for this application everyday. Keeping the mid driver at the upper edge of the baffle would allow for the smoothest frequency response.
Rudolf
IMHO you shouldn´t cling to a 100 Hz crossover frequency that much. If you x-over at 200-300 Hz, a 50 cm baffle will easily be large enough to stay above the baffle step for the mid driver. So no eq needed there.
The Jordan JX 92S would probably be an excellent candidate for medium/high duties.
I don´t see any advantage in a "lml or llmll configuration". llm would be my choice for this application everyday. Keeping the mid driver at the upper edge of the baffle would allow for the smoothest frequency response.
Rudolf
Here is a quad amped (horn loaded below 50 cycles) open baffle with 21" woofers, JBL 2123J mids and Heil air motion transformer treble.
I have since replaced the treble with Beyma CP 380M compression drivers loaded in 18 sound elipsiod horns
Old Thread-
Look at the Bastanis website, this is similar to what you are looking at. From what I have researched people seem to think it is a modified Eminence Beta LT which runs to about 10,000Hz where it naturally rolls off and gets picked up by the tweet. It sits on top of a sub and looks quite nice. I have thought of building something similar.
www.bastanis.com
www.baulsaudio.com
www.bastanis.com
www.baulsaudio.com
Salut Hugues
A friend of mine in California builds O.B. projects often, and has for 20 years.
His latest project was a big one. 2 Eminence 18" drivers per side for the lows, the Eminence Beta 12LTA fullrange for the mid and ScanSpeak 8200 for the tweeter. (Great tweeter, but the price has gone way up
)
All passive filters for everything. Only needs about 100 watt amp to play really loud.
I have not yet head them, but they broke hearts and scared the guys at the last Northern California DIY speaker meet.
I can ask for details if you are interested.
A friend of mine in California builds O.B. projects often, and has for 20 years.
His latest project was a big one. 2 Eminence 18" drivers per side for the lows, the Eminence Beta 12LTA fullrange for the mid and ScanSpeak 8200 for the tweeter. (Great tweeter, but the price has gone way up
)All passive filters for everything. Only needs about 100 watt amp to play really loud.
I have not yet head them, but they broke hearts and scared the guys at the last Northern California DIY speaker meet.
I can ask for details if you are interested.
You could contact Rudolf, he is experienced in OBs with bass augmentation and very active in several forums.
http://www.dipolplus.de
I don`t claim to be an expert.
http://www.dipolplus.de
I don`t claim to be an expert.
Hugues,
a high Qts will give more bass, yes. But Qts as high as 1,26 seems indicative of a rather cheap (=poor?) driver. Since your are prepared to filter actively with eq for bassloss, I would recommend to stay with a driver Qts<0,8.
BTW, smaller magnet usually means higher Qts, but less control of the amplifier on the cone. That probably leads to a unsufficiently subdued resonance at fr, which you don´t want to have.
Do yourself a favour and look more for a sturdy basket and a properly vented motor than for a high Qts. And of course - Xmax is determening how loud you can go.
Rudolf
a high Qts will give more bass, yes. But Qts as high as 1,26 seems indicative of a rather cheap (=poor?) driver. Since your are prepared to filter actively with eq for bassloss, I would recommend to stay with a driver Qts<0,8.
BTW, smaller magnet usually means higher Qts, but less control of the amplifier on the cone. That probably leads to a unsufficiently subdued resonance at fr, which you don´t want to have.
Do yourself a favour and look more for a sturdy basket and a properly vented motor than for a high Qts. And of course - Xmax is determening how loud you can go.
Rudolf
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