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Recone or not?

T

traynorbassmate

Jun 17, 2009
108
1
#1
I have a US ampeg 210. My last bass head went a little screwy and would fart on the low E, and would generally cause the cone to move erratically (way more than it ever should move). After observing the cone, i've found that there is a crease in the paper in the shape of a circle, about an inch away from cone's outer edge. The crease looks similar to when you bend corrugated cardboard.
At last night's gig i noticed that the cab would fart a little bit on certain notes but i'm using a new head which sounds great through other cabs.

I suspect that the cone is buckling at the crease instead of dissipating the energy outward to the supportive rubber stuff at the outer edges. Can anyone speculate if i'm on the right track? What prices should i be looking at for a reputable service shop to do the work?

Thanks
 
#3
I never played excessively loud to the point of driving the speaker beyond its mechanical limits. Obviously the amp did the damage, but it did so because it was broken. The cone would bounce out a full inch on even the lowest volume on the low E. The cone moves normally again with my new amp but am I right to conclude that this crease is causing distortion when i start to turn up the volume? Hence would this definitely be solved by a re-cone?
 
#4
the damage prolly did not occur cause "your amp was broken" but due to over-excursion and whatever you did to cause that. Now, you don't say what was found in the broken amp, so that might help. But really a broken amp aint prolly what broke your driver, unless you care to elaborate on why you feel this way.

That said, I've had very good results with having speakers reconed in the past and they've stayed in good working order afterwards. We have a speaker repair shop here in the Houston area that's been in business for many many years.

I trust his work and for aprox. $35 to recone a 12" driver a few years ago, I've been very happy with his work and the results with use afterwards. This guy knows his stuff, so be sure to find a reputable repair service. Good luck.
 
#7
What you describe could be an amp going
intermittently to rail and producing full scale dc offsets.
I have seen this occur once since I started doing amp repair in 1972, that
was in an old MM electronics 400 power amp when one of the bias diodes went intermittent, it would make a huge pop on switch on as the cone drove out and then slowly settled back to the center line.
Any input at all cased the amp to shunt short violent pulses of DC.
Not good for speakers at all mate.
Diodes usually work fine or don't work at all.:ninja:
 

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