Just an idea, perhaps someday turned into a sticky.
How about we make a list of drivers with notch values, even baffle step values (if you have box dimensions)?
How about we make a list of drivers with notch values, even baffle step values (if you have box dimensions)?
W8-2145 used in the “cobra 2”.
Notch is 4.7uF + 1mH + 3.9ohms (seen 5.6ohms also) = 2.2khz
Cobra-Horn 2
Notch is 4.7uF + 1mH + 3.9ohms (seen 5.6ohms also) = 2.2khz
Cobra-Horn 2
W8-1772 used in a 10” x 10” x 44” mltl
Roughly 8db baffle step filter = 4mH + 10mH
Tang Band W8-1772 Impressions.
Roughly 8db baffle step filter = 4mH + 10mH
Tang Band W8-1772 Impressions.
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w8-1772 (from fredt referencing bob brines)
"Bob told me it's ok to let the cat out of the bag about his compensation network, so here it is:
A 4mH inductor in parallel with a 12 ohm resistor (I used a 10 ohm), with those components followed by a series 0.5mH inductor to roll off the highs.
Bob modeled this combination but hasn't heard it since he uses DSP compensation in his speakers. I found the 0.5mH inductor's value was waaaaay to high and tried a 0.33, then a 0.24, followed by a 0.15mH. The 0.15 seems to be about right, but even that value shaves off some brush-on-ride-cymbal sounds. For example, that sound in the first few measures of Patricia Barber's "Let it Rain" from "Modern Cool" is better with no series inductor at all. I'm now listening to the speakers with a zobel consisting of a 6.8uf and a 10 ohm, which Bob suggested I try instead. That seems to be the best solution."
can't tell you much of the dimensions of his speaker boxes, maybe tt-2000 model...…………...
"Bob told me it's ok to let the cat out of the bag about his compensation network, so here it is:
A 4mH inductor in parallel with a 12 ohm resistor (I used a 10 ohm), with those components followed by a series 0.5mH inductor to roll off the highs.
Bob modeled this combination but hasn't heard it since he uses DSP compensation in his speakers. I found the 0.5mH inductor's value was waaaaay to high and tried a 0.33, then a 0.24, followed by a 0.15mH. The 0.15 seems to be about right, but even that value shaves off some brush-on-ride-cymbal sounds. For example, that sound in the first few measures of Patricia Barber's "Let it Rain" from "Modern Cool" is better with no series inductor at all. I'm now listening to the speakers with a zobel consisting of a 6.8uf and a 10 ohm, which Bob suggested I try instead. That seems to be the best solution."
can't tell you much of the dimensions of his speaker boxes, maybe tt-2000 model...…………...