Hey there,
I plan to build a pair of active monitor speakers from a broken Yamaha keyboard (all speakers magnetic) :
Woofers: 283 Yamaha / XJ999 / 8Ohm 20W
Tweeters: 281 Yamaha / XK000 / 8Ohm 20W
On the original board, the speakers are wired in a "not so crossover fashion" with the woofers connected directly to the amp and the tweeters fed through a 3.3uF bipolar electrolytic capacitor. If I got the math right, that gives us a 1st order Butterworth high-pass around 6000Hz.
Considering a 2nd order Linkwitz-Riley crossover, is it ok to aim for a 3000Hz cutoff frequency (from a 6000Hz at 6dB rolloff (1st order) to a 12 dB rolloff (2nd order)) ? That would mean C=3.3uF and L=0.85mH.
Thanks for your time.
I plan to build a pair of active monitor speakers from a broken Yamaha keyboard (all speakers magnetic) :
Woofers: 283 Yamaha / XJ999 / 8Ohm 20W
Tweeters: 281 Yamaha / XK000 / 8Ohm 20W
On the original board, the speakers are wired in a "not so crossover fashion" with the woofers connected directly to the amp and the tweeters fed through a 3.3uF bipolar electrolytic capacitor. If I got the math right, that gives us a 1st order Butterworth high-pass around 6000Hz.
Considering a 2nd order Linkwitz-Riley crossover, is it ok to aim for a 3000Hz cutoff frequency (from a 6000Hz at 6dB rolloff (1st order) to a 12 dB rolloff (2nd order)) ? That would mean C=3.3uF and L=0.85mH.
Thanks for your time.
Impedance varies with frequency, '8' ohms is just nominal, so you need to measure the actual impedance of your drivers to get accurate results. Download ARTA, make a simple jig & you're on your way...
ARTA Download,
AudioBlog: A simple loudspeaker measurement jig for ARTA
ARTA Download,
AudioBlog: A simple loudspeaker measurement jig for ARTA
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