Thanks to you all for your advice. I will try this simply for the fun of it, as a mic is not that expensive. I guess an important conclusion from what you are saying is that capacitor changes that can be heard and matter will not make a big difference in the response curve, or will be smaller than the variance in any case. I will compare near and far from the speaker to minimize effect of the room. If I am really fired up, might take the system outside :)
test crossovers or capacitors with frequency sweep
Hi everyone - I know that with an inexpensive calibrated mic (eg umik) and cheap/free software that generates a frequency sweep you can produce a frequency versus loudness curve for your speakers. If you have this curve from the factory (it came with my speakers, Celestion 700) can you examine the match between your curve and the factory one to see if of some of the crossovers have changed? Wondering if I should recap as I just bought these used, and this seems like a way you could see if there is enough of a change to matter. Thanks for your help.
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Two places to go for help is the Room EQ Wizard forums as well as DIYaudio. @rodman99999 - I don't know how many have actual anechoic chambers. Close-microphone, quasi-anechoic measurements are a lot more convenient. For the definitive resource see Joseph D'Appolito's book, "Testing Loudspeakers"
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OP:
In this case your best bet is going to be to do close mic driver to driver measurements. Use a 60Hz reference tone and set output to 2.8V. Put your measurement mic at 1/4" in front of a driver, and measure. Repeat for each driver. For cone woofers/mids measure the mic distance in front of the dust cap. Use a plastic ruler to make sure you don't have the magnet pull it through the cone. :) This part is relatively simple, assuming you don’t move your volume control. Your drivers should match up. The complicated thing is putting it together into whole speaker measurements. Too much go go into hear. |
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