What G1 said
Failure description + pictures point at gross overpowering.
That Bass Player must LOVE Jack Bruce sound.
- "hey, your Bass is distorting ..."
-" what distortion? ...."
Full rail to rail squarewave all the time.
Probably 500/600 W squarewave from a 300/350W RMS sinewave power.
4 x 10" voicecoils (150W each) stood onslaught for 90 minutes; single EV one (probably oldstyle EVM15L rated 200/250W RMS) stood it "minutes".
I see a failure which wass more commong long ago, not that much today: even before wire to wire glue toasting, whole flatwire block unglued from Kapton former.
Actually epoxy attaches *poorly* to Kapton, too smooth no pores surface and this failure was relatively common; afterwards some mechanically roughened winding area with a process similar to sandblasting (I used fine grain wetordry sanding paper) or chemically etched surface, dramatically improving adherence.
I bet that EV speaker can be reconed with modern aftermarket coils and stand more.
In any case, Bass player is some kind of Terminator, since he blew the 4 x 10" too.
Given his style he needs 2 x 8 ohm 4x10" cabinets with 8 x 10" 150-200W RMS speakers ... since he is applying constant 500/600W (clipped) to them.
EDIT: almost forgot.
before moving so much that it actually clipped the wire opening the circuit, that voice coil jumped all over the place, and winding scratched gap walls both scratching enamel which already makes UGLY mechanical nouise, but also allowing wire to wire arcs appear, which spark and produce buzzy sound.
Sound must have been *horrible* but clearly player doesn´t care ... or even notice it.![Roll Eyes ::)](https://www.ssguitar.com/Smileys/default/rolleyes.gif)
Not sure amp is at fault, and quite certain user woild cause same damage with an equivalent power amp, such as a Hartke 3500 or some Ampeg SVT Pro. (the SS ones).
Or one of the small Class D ones, some of which are deadly (say 550W RMS into 4 ohm).
Failure description + pictures point at gross overpowering.
That Bass Player must LOVE Jack Bruce sound.
- "hey, your Bass is distorting ..."
-" what distortion? ...."
Full rail to rail squarewave all the time.
Probably 500/600 W squarewave from a 300/350W RMS sinewave power.
4 x 10" voicecoils (150W each) stood onslaught for 90 minutes; single EV one (probably oldstyle EVM15L rated 200/250W RMS) stood it "minutes".
I see a failure which wass more commong long ago, not that much today: even before wire to wire glue toasting, whole flatwire block unglued from Kapton former.
Actually epoxy attaches *poorly* to Kapton, too smooth no pores surface and this failure was relatively common; afterwards some mechanically roughened winding area with a process similar to sandblasting (I used fine grain wetordry sanding paper) or chemically etched surface, dramatically improving adherence.
I bet that EV speaker can be reconed with modern aftermarket coils and stand more.
In any case, Bass player is some kind of Terminator, since he blew the 4 x 10" too.
Given his style he needs 2 x 8 ohm 4x10" cabinets with 8 x 10" 150-200W RMS speakers ... since he is applying constant 500/600W (clipped) to them.
EDIT: almost forgot.
before moving so much that it actually clipped the wire opening the circuit, that voice coil jumped all over the place, and winding scratched gap walls both scratching enamel which already makes UGLY mechanical nouise, but also allowing wire to wire arcs appear, which spark and produce buzzy sound.
Sound must have been *horrible* but clearly player doesn´t care ... or even notice it.
![Roll Eyes ::)](https://www.ssguitar.com/Smileys/default/rolleyes.gif)
Not sure amp is at fault, and quite certain user woild cause same damage with an equivalent power amp, such as a Hartke 3500 or some Ampeg SVT Pro. (the SS ones).
Or one of the small Class D ones, some of which are deadly (say 550W RMS into 4 ohm).