bz wrote:Let's use your example of 35" does that mean you don't get to hear the instruments from the lower frequency or it is just there but not so clear?
My point was even if theoretically the 35" width is limited to 90hz, in my room I can easily hear music down to an octave below that (45hz) with Altec 755s and even lower with 604/605 duplex. It may not measure flat on a real time analyzer but I'm talking about actual music playback.
bz wrote:Saw those Hawthorne and Bastanis type OB. The fullrange drivers are a little bit higher is that the reason why they added active bass bellow?
If you read and understood the Briggs article and the table I uploaded, a tall/thin OB does not do well in the bass. But to satisfy the aesthetic standards of contemporary high end aficionados the baffle has to be slim so you get another compromise - OB midrange----> highs and active woofer in a box for bass.
bz wrote:Have you tried using 4" driver for OB? The driver used for OB is full range nothing else right? thanks again
The smallest driver I've tried in this OB is the Diatone PM610MB (6") and it played the same amount of bass as it did in the stock bass reflex cabinet. That cabinet was so boomy the lower midrange was affected. In the OB, bass was tighter thus the entire midrange sounded more natural.
You can try any type of driver on an OB some work better than others. My experience is limited to mostly vintage classics like the 8" Altec 755 fullrange and 605 duplex (15" co-ax with a compression horn driver for the high frequencies) for monaural. I have two friends who use Altec 604-8G duplexes in OBs - Ding and Abe (amandarae). Abe's system is posted at the Member's system forum with links to You Tube. Joel (setup2) uses the OB for his 12" Altec 414 woofers with 511/902 horns for the upper frequencies. Go to
my OB webpage to see what drivers I've tried through the years.
je