The problem is that there is no "sharp point" of the signal-so exactly where is the "arrival".
Yes, that lack of a "sharp point " has driven me crazy at times...I'm thinking maybe a relatively steep 48dB low pass, and the use of linear phase x-overs, makes for a better grab handle for the delay finder....or perhaps better said, a 'grab plateau'.I'm mean, if electrical x-over group delay variations have been nearly eliminated, shouldn't any freq the delay finder hooks onto within the passband read close to the same delay ? I realize group delay variation's from the raw sub itself have to be taken into account too, and those variations if signifigant will screw the plateau idea up.... ....but fortunately in the case of the labhorns and OS's, the raw sub phase looks nicely flat, so group delay variations are minimal here too.......... maybe all this together accounts for the delay finders' tight spread of measurements? ? And in this case maybe it doesn't matter too much, what freq it hooks on to ? ?Just thinking out loud...make any sense?
One easy way to get really confused-do this test.Use a sub-cross it over in a "normal" freq (let's say 100hz or lower).Now use the delay finder in whatever program you are using.Does the number it gives make any sense? If you were to measure the physical distance from the mic to the cabinet-add the physical delay inside the cabinet and add any digital delay.In most cases you will find that the presented time/distance is much longer than the actual distance.The reason is that the program has a specific "point" that it is looking for. Where that "point" is, varies.
Wish I could force smaart's delay finder to lock onto selected freqs....would be great to thoroughlycheck this out.
What's so hard? Use a tone instead of pink noise. Smaart doesn't care what it's listening to when it is finding the delay, you only need full bandwidth for full bandwidth measurements. If you don't get repeatable results with the tone add some pink noise or music under it.Mac
But I'm not talking about how the delay finder doesn't work for sub frequencies......I'm reporting an experience/methodology where it does work, and apparently very accurately.
But does the numbers the delay finder gave you make sense in relation to the actual distance from the sub?THAT-is the whole point of my post.
Hi Ivan, YES, like I said, the numbers in the delay finder accurately reflect the actual distance from the sub...
I guess I sound like a "doubting thomas", but the delay distance "should" be greater than the actual distance, in order to account for the physical path length of the horn.In every case that I can remember, the delay time was much, much longer than the actual distance between the mic and the cabinet.
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