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items: Measurement Microphones
items: Re: Measurement Microphones

Measurement Microphones
type: item
description: I decided to measure my speakers today, Pi 4 mains with Pi 3 subs. I used a Pyle Pro PDMIC58 (Shure SM58 clone) that I have laying around the house for drunken karaoke nights, so I knew going in that these measurements may not be accurate. They ended up having a slope to them that I haven't seen on other Pi speaker measurements. After doing a little reading, I found this chart for the SM58 (bottom) that looks quite familiar... So as someone who does not measure speakers very often (I'm actually only measuring them now because I plan to rebuild my cabinets in the next couple of months and would like before/after measurements) I'd like to know what microphone(s) I should be looking at. I've seen several units that claim to be measurement microphones starting around $40 online. Or am I barking up the wrong tree?
creator: jshupe
date: 2015-02-14T23:28:30-00:00

Re: Measurement Microphones
type: item
description: You can definitely see the influence of the microphone superimposed on the measurements. Your charts look right considering the microphone response curve has rolloff down low, up high and a peak between 3kHz and 5kHz. If you were to account for the microphone chart with a conjugate curve, and then apply that curve to the measurement charts, you'd have a chart that accurately showed loudspeaker response.
creator: Wayne Parham
date: 2015-02-15T17:44:24-00:00

Re: Measurement Microphones
type: item
description: I found the following SM58.cal file out on the internet, and loaded it. 20 -15 50 -7 100 -1 120 0 1000 0 2000 +1 4000 +4 5000 +5 7000 +3 7500 +2 9000 +3 10000 +4 15000 -5 20000 -15 My microphone is knockoff, so I don't expect those figures to be exact. And my room is terrible: 16' ceilings, ceramic tile floors, very few treatments. I think the measurements look pretty good all considered, but I'm not entirely sure what they're expected to look like in my case.
creator: jshupe
date: 2015-02-15T18:52:54-00:00

Re: Measurement Microphones
type: item
description: There you go! That's what I'd expect to see.
creator: Wayne Parham
date: 2015-02-16T05:26:37-00:00