Since 1969, on and mostly off, I've been exploring motional feedback for woofers (the final frontier). I'm now "sharpening" my tools to compare different means of applying feedback. So, I am trying to find the best two or three indices of performance, not necessarily quantitatively, but at least a good picture.
For the most part, I'm interested in distortion reduction (that's easy to assess with wonderful REW) and cone motion after the end of a signal but also the way the cone starts moving at the onset of a signal*. In the past, I've used instantaneous-like pulses, slow square waves, and tone bursts as stimuli. Sadly, REW has no pulse output (and I guess the REW impulse display is calculated, unlike a scope picture). The only REW tone burst is a Hann-window which is designed not to end abruptly or have higher frequency components and so a bit soft judging the errors of the cone start-up and after-rumble.
Any advice in setting up a stable and repeatable yardstick assessment toolbox appreciated. Thanks.
Ben
*No sane person would want to start a discussion about "fast woofers", but....
For the most part, I'm interested in distortion reduction (that's easy to assess with wonderful REW) and cone motion after the end of a signal but also the way the cone starts moving at the onset of a signal*. In the past, I've used instantaneous-like pulses, slow square waves, and tone bursts as stimuli. Sadly, REW has no pulse output (and I guess the REW impulse display is calculated, unlike a scope picture). The only REW tone burst is a Hann-window which is designed not to end abruptly or have higher frequency components and so a bit soft judging the errors of the cone start-up and after-rumble.
Any advice in setting up a stable and repeatable yardstick assessment toolbox appreciated. Thanks.
Ben
*No sane person would want to start a discussion about "fast woofers", but....