duanea I replaced the diaphragms/voice coil on a friends WP7’s because of a Class-D Nuforce 9se v3 amps VHF switch-on squeal that you can hardy hear, but can be measured, both voice coils were very blue with heat, they were standard Seas, Scan or similar from memory, diaphragm/coil were about $50 each. took about an hour each to do. Cheers George |
V. Old thread but this is a common problem. Ferrofluid dries out after as little as two years and tweeters burn up easily. The biggest culprit is amplifier clipping or HF instability in Class D type amps - usually the clipping is caused by overly demanding bass but the damage goes straight to the tweeter which heats up very fast when clipping. The second biggest culprit is consumer speakers being overdriven - most speakers can’t do more than 95 dB SPL for very long before becoming severely stressed. |
