I guess the Linwitz transform is applicable to OB as well.
Linwitz Orion ASP
Attached link shows the Linkwitz Orion crossover, and Linwitz transform is in the woofer section.
Linwitz Orion ASP
Attached link shows the Linkwitz Orion crossover, and Linwitz transform is in the woofer section.
Actually using a Linkwitz Transform to adjust the poles, in an open baffle loudspeaker, is a perfectly good use of it. Linkwitz did exactly the same thing in his Orion.
The original Orion used the 10" Peerless XLS drivers with their Qts down at 0.2 and Fs at 20Hz. Linkwitz set the new parameters at something like Qts 0.5 and Fs 40Hz.
This set the low frequency cut off of the loudspeaker where he wanted so that a typical shelving network could then EQ the open baffle losses correctly.
I cannot explain why swapping the polarity, on the loudspeaker cables, is showing such bizarre results. This is not what should be happening.
And yes the LT is naturally inverting.
The original Orion used the 10" Peerless XLS drivers with their Qts down at 0.2 and Fs at 20Hz. Linkwitz set the new parameters at something like Qts 0.5 and Fs 40Hz.
This set the low frequency cut off of the loudspeaker where he wanted so that a typical shelving network could then EQ the open baffle losses correctly.
I cannot explain why swapping the polarity, on the loudspeaker cables, is showing such bizarre results. This is not what should be happening.
And yes the LT is naturally inverting.
If the LT is applied after an active crossover then this implies that all the drivers are actively driven. You didn't accidentally put one cable in the wrong driver?
Thanks, I’ll double check it. It works quite well actually (posted it earlieir in DIY biamp 6-24 crossover thread and the measurement) but I want to reduce the peaks in the 40-150Hz region with a FIR minimal phase filter, so I want to be sure everything in a correct phase. Tomorrow I'll check it with a scope. But it looks like that the inverting buffer between the active crossover and the LT is a way to go.