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Re: Maggie IIIa 3-way Active Crossover Project (long)

Posted by Tim Murphy on February 13, 2004 at 00:01:29

In Reply to: Maggie IIIa 3-way Active Crossover Project (long) posted by andyr on February 11, 2004 at 00:38:43:

Thanks for the report

My friend ended up setting his digital crossover so they duplicated the stock IIIA crossover also.

Pink noise can be used with the driverrack PA because it has a 29? band RTA/EQ that separates the pink noise into equal bands. Also the Behringer DEQ I have does the same. Thats why I originally suggested using pink noise.

For testing with a dB meter, I would assume that most test disk use warbled tones-at least in the bass tones. The test disk I use is called "My Disk" by Sheffield Labs. It is an older disk and a bit expensive but probably still available.

As I now read thru the "My Disk" booklet, I see where the 1/3 octave bands ARE pink noise. Let me just quote from the booklet:

"These tracks contain pink noise that has been filtered into successive 1/3rd octave bands starting with 25 Hz. Each track contains three 1/3 octave bands that constitute an octave...These filtered bands can be very useful for measuring system tonal balance-especially if you don't have access to an RTA (Real Time Analyzer). Each band can be measured on a simple sound level meter (SLM) and the value plotted on a chart to obtain a response curve..."

So pink noise can be used if it is filtered into equal
energy bands, in this case 30 bands of pink noise. For example, the last octave has three bands at 12.5kHz, 16kHz and 20kHz.

Hope this clears things up.

I'm not sure what a CRO is, I guess it means Cathode Ray Occiliscope.

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