If you own an Eden amplifier, there is a section in the user manual about the magic smoke:
"The Magic Smoke – Few people realize just how much magic goes into creating Great Bass Tone. It isn’t something you normally need worry about. Just have fun and leave all that to us. However – and this is very important – if you ever release the Magic Smoke from your amplifier this is indeed a Very Bad Thing, perhaps the worst thing you can do. If you see any smoke (Magic or otherwise) coming out of your amplifier, immediately turn it off and seek the services of a qualified magician…uhm, we mean…technician. DO NOT continue to use the amplifier in this condition."