Woofers for OBs

[miguel2]

Hi,

I have now open baffels playing with Beyma 8ag/n drivers as full-rangers. They give a nice sound but fail to deliver below 100Hz.
I have been looking to the OB plan from supravox, which uses the 285 GMF for bass http://www.supravox.fr/Doc%20kits/panneauplan.pdf
I though f implementing something like this in my OBs but I need a driver that doesnt break the bank.

A slightly different idea is to use different widths for the full range and the bass units, keeping the front of the baffle in a common plane to both units. And I can also use lateral pannel for the bass unit, to get lower frequencies. A box without the back pannel should also work, as long as the front baffle remains common to the units. But the rear reflections of the full range unit can be adversely influenced.

Any thougts about this?

Miguel

[Rudolf]

There still is an alternative between the quite cheap Beyma and the expensive Supravox. Did you consider the Ciare CH 250?
Someone has built an OB for them. He claims to get 60 Hz easily. Although text is in german, you certainly will get the picture ;-)

http://www.audiodiskussion.de/foren/....php?idx=12487
and
http://www.audiodiskussion.de/foren/....php?idx=12374

Rudolf

[miguel2]

I already have the Beyma's and I am happy with them between 100 Hz and around 16 kHz.

So I am looking to frequency extremes now. Another option is to build one sub but I would like to have the stereo picture all the way. I have to experiment if a smaller baffle for the beymas will work on top of a sub open box. I am consideirng also a NaO style sonotube for the sub driver, implemented in the baffle.

Miguel