ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
I just found out after reading the site info of the Beolab 19 in detail that the two opposing drivers are sealed from each other. That's completely unique! I wonder what gains does that approach yield?
It's not completely unique.. The technique is also implemented on the BeoLab 11... but there the drivers are positioned towards each other.. also canceling out the vibrations of the sub itself.
wonderfulelectric: I just found out after reading the site info of the Beolab 19 in detail that the two opposing drivers are sealed from each other. That's completely unique! I wonder what gains does that approach yield?
If you put two drivers in the same enclosure, unless they are ABSOLUTELY identical in every respect, at all levels and temperatures, they will get into a fight and one of them will win.
As part of the development, we tried putting the woofers in a single enclosure, and we found that we get much more control over the woofers, particularly in their temporal response (you can read that as "more punch" if you like - since that's the most obvious audible difference) when they are in separate enclosures. As a result, the acoustic design required that we put an airtight bulkhead down the middle of the the enclosure to keep things behaving properly.
Cheers
-geoff
Geoff Martin: wonderfulelectric: I just found out after reading the site info of the Beolab 19 in detail that the two opposing drivers are sealed from each other. That's completely unique! I wonder what gains does that approach yield? If you put two drivers in the same enclosure, unless they are ABSOLUTELY identical in every respect, at all levels and temperatures, they will get into a fight and one of them will win. As part of the development, we tried putting the woofers in a single enclosure, and we found that we get much more control over the woofers, particularly in their temporal response (you can read that as "more punch" if you like - since that's the most obvious audible difference) when they are in separate enclosures. As a result, the acoustic design required that we put an airtight bulkhead down the middle of the the enclosure to keep things behaving properly. Cheers -geoff
I thought so as much. All the gains of an opposing driver configuration approach without its real downside.
Thanks Geoff
Ps. To be honest I had always wanted to know the benefits of this novel implantation of isolated push push configuration but never gotten a chance. But wouldn't this approach essentially halves the volume available for each driver and put further strain on both the amplifier and driver?
wonderfulelectric: I thought so as much. All the gains of an opposing driver configuration approach without its real downside.
wonderfulelectric: Ps. To be honest I had always wanted to know the benefits of this novel implantation of isolated push push configuration but never gotten a chance. But wouldn't this approach essentially halves the volume available for each driver and put further strain on both the amplifier and driver?
I've seen double woofer setups where one was mounted facing out, the other facing in, allegedly to cancel out certain distortion products inherent in the drivers. Always wondered how much distortion that actually canceled, it seems to me that it'd make more sense to find a woofer with lower mechanical distortion products.
I have seen DIY speakers where the builder chose not to use a sub chamber for his cone midrange, always fun to watch the woofer modulate the midrange. Especially when at loud volumes a big bass drum whack caused the midrange to push out and stick when the voice coil got misaligned. Suddenly there's a huge suckout in the mids for some odd reason!
Jeff
I'm afraid I'm recovering from the BeoVirus.
Thanks for the explanation Geoff.
And of course the opposing driver configuration is everywhere now, it's great marketing and yields good performance bug I didn't get the isolating the drivers are each other. But Geoff's explanation makes sense.