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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Help help speaker demaged posted by senderj on February 16, 2006 at 20:36:13:
What you had was voice coil popping out of the magnet and geting stuck there. You can try to save speaker by carefully pushing the cone further out and then guiding it back into magnet slit. This once happened to my Scan Speak woofer, and I was able to bring it back without any deterioration of sound.Bass speakers with long throw cone movement are prone to this mishap.
On the amplifier side, what happened was a very high amplitude low frequency pulse. It has been caused by turn-on transient somewhere in the audio circuit, most likely at the interface between pre and power amp. Look carefully at the schematic of both to find out whether interstage capacitor is charging on turn-on. Another possibility (that's what happened in my case) is subsonic oscillation. If your power amp bandpass extends well into infrasound, you may want to limit it to something like -3dB at 30 Hz in order to prevent violent ultra low freq. oscillations in the future.
Regards,
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Follow Ups
- It is not demagged. - sser2 12:27:10 02/17/06 (2)
- Re: It is not demagged. - senderj 17:51:49 02/18/06 (0)
- He means "damaged", not de-magnatised. - Allen Wright 05:17:22 02/18/06 (0)
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