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I have a Pioneer XPRS 10 at work that isn't producing any high frequencies; the 10" woofer working fine, but the 1.75" tweeter is not producing any sound at all. It's a 50W, 8 ohm tweeter. I have tried it on a couple of amplifier outputs. What's really strange is that it tests fine in other areas: it shows up as 6.5 ohm resistance on a multimeter, which I understand is normal on DC. When I do the 'battery test' on the terminals with an AA battery, the tweeter crackles and shows signs of life. The dome/diaphragm itself also looks completely intact.

Though my job does occasionally involve fixing audio equipment, I'm an amateur at fixing speakers, and all my knowledge is gleaned from the internet + some years experience of messing around with electronics. How do I go about diagnosing what the real problem is? If the diaphragm is fine, what other parts of a tweeter can go wrong?

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    \$\begingroup\$ The passive crossover inside the speaker could be banjaxed. It will be high-pass, so there's probably an inline capacitor. \$\endgroup\$ Commented May 16, 2024 at 20:18
  • \$\begingroup\$ So it's likely not the speaker itself that is at fault, but the end of the amplifier chain? I'll investigate by opening up the amplifier circuit when I get back. Thanks \$\endgroup\$ Commented May 17, 2024 at 10:18
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    \$\begingroup\$ No, for passive speakers the crossover is inside the speaker cabinet as stated in my previous comment. blog.teufelaudio.com/what-is-a-speaker-crossover \$\endgroup\$ Commented May 17, 2024 at 17:30
  • \$\begingroup\$ Cheers for the link. It's not passive, it's active. Pioneer XPRS 10 \$\endgroup\$ Commented May 18, 2024 at 8:04

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