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dwilawyer

CHIEF BONEHEAD Education Class

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20 minutes ago, JohnA said:

 

Edgar, didn't that Butterworth comment apply to the filters used in the demo, not the ones in the actual speaker?  As I remember, the actual network had 2-pole filters that achieved about 24 dB/oct and included driver EQ.  THAT was the clue to the work Roy put into the C IV design.  I had done something similar mating an FH-1 to an Altec 511B/902-8B.  My treble high-pass achieved 18 dB/octave with a sag in the response to kill a hump in the driver's output, all with 2 elements.  I spent weeks on that design. 

 

I believe that you are correct -- Roy was referring specifically to the filters used in the DSP. But a two-pole (12 dB/octave) digital filter translates to a two-pole analog filter, and vice-versa, at least for the kinds of digital filters used in most commercial DSP units. 

 

But I think you're referring to the fact that the combination of a 2nd-order (12 dB/octave) analog crossover filter used in the actual speaker, plus the response of the driver itself, can end up being a 4th-order (24 dB/octave) acoustic response, or 3rd-order (18 dB/octave) acoustic response, or a number of other responses depending upon how creative the designer gets. That is quite true, and Roy did a really nice job of explaining that with the measurements that he showed in the lab. Analog filter elements (capacitors, inductors, resistors) interact in ways that digital filter elements do not, which can be either a curse or a blessing.

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The second photo is amazing, apparently this is a studio for suppressing sound noise from outside for a cleaner and better sound?

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6 hours ago, Armano said:

The second photo is amazing, apparently this is a studio for suppressing sound noise from outside for a cleaner and better sound?

 

If you are referring to the second photo in the original post, that is called an anechoic chamber. It is designed to absorb all sound that reaches the walls so that there are no reflections, and just the loudspeaker itself can be measured.

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