Jamo R909 uses unusually sensitive woofers so they’re louder than the other drivers by default with a rising response, then a filter in the crossover is used to drop the level of the woofers at exactly the rate of their low end rolloff. The result is a passive open baffle speaker that doesnt need active EQ to make up for a drop in low end.
Open baffle speakers
Open baffle speakers design is the simplest , to get bass response similar to other design , like ported, the baffle size must be huge to avoid low frequency degradations . Tipical size the baffle width 10-20" got weak bass performance. I am wondering how open baffle speakers design became so popular ?
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If money is no object, one of the finest OB's out there is the Songer Audio. It sets a standard I haven't quite heard in any OB speakers. And the build quality is second to none. Get ready to write a serious check, though. https://songeraudio.com/
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Box speakers with multiple drivers create a slew of problems: cohesive sound across the drivers, degradation in sound quality from cheap connectors and crossovers, uncontrolled sound waves bouncing around inside the cabinet, and a waste of money on cabinet design and manufacture. Get a world-class single full-range driver for the cost of an entry level box speaker. You can even get excelllent quality sound from a $400 set of 15" Lii drivers. Or use an 8" driver with a good sub for the lowest frequencies; it's the right tool for the job. Life is as hard as you make it. |
I like both the OB and the closed model of the Songer speaker. The OB was a two way system using their field coil driver as a woofer/midrange coupled to an OB tweeter. The closed box speaker did not have a tweeter so the field coil driver operated full range. They both sounded very good, which is probably more of a testament to their field coil driver than to other aspects of their design. There is another OB field coil speaker that I've heard made by Treehaus Audio. They use huge slabs of wood cut so that the edges of the panel hold the outer bark of the tree. The speaker can be stunningly beautiful. One of the drivers is an old Klangfilm field coil driver that has been reconditioned. I generally like the sound, though not as much as I do PureAudioProject and Songer Audio speakers, and they do look stunningly beautiful. |
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