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I was curious if having coil rub or a off balanced/ non linear coil cause a amp to blow out? Thanks in advance
Your speaker will pump the exact same number of times per second and to the same excursion with a square wave as a nice round looking one. Square wave just gives you 30ish % more current over time. The shape of the waveform isn't what burns up coils.With the speaker mostly in the motionless state,
It may be possible to short part of your coil and hurt your amp if you're rubbing too much of the shellac off of the windings and that's touching the top plate or something but typically coils burn open when they fail.I was curious if having coil rub or a off balanced/ non linear coil cause a amp to blow out? Thanks in advance
Your speaker will pump the exact same number of times per second and to the same excursion with a square wave as a nice round looking one. Square wave just gives you 30ish % more current over time. The shape of the waveform isn't what burns up coils.
It may be possible to short part of your coil and hurt your amp if you're rubbing too much of the shellac off of the windings and that's touching the top plate or something but typically coils burn open when they fail.
That's just splitting hairs. You’re elaborating on what was already said. The shape provides the conduit for DC to enter into the circuit. The shape is relative not responsible. What I said was not theory, it's a fact. It's what is being pumped that changes the heat value, the duration, etc, are all part of that equation, not the fact there is a force reaction up or down as would be present when any voltage is applied, unless shorted. In the end, it leads to driver failure. Running shorted drivers or speakers, can be or running an amplifier to clipping for long durations, will be detrimental to the amplifier and the speakers. To answer the OP, he’s got a driver with a mechanical fault; it could (will be) be problematic for the amp too. That is the answer to the question.Your speaker will pump the exact same number of times per second and to the same excursion with a square wave as a nice round looking one. Square wave just gives you 30ish % more current over time. The shape of the waveform isn't what burns up coils.
It may be possible to short part of your coil and hurt your amp if you're rubbing too much of the shellac off of the windings and that's touching the top plate or something but typically coils burn open when they fail.
Wow. The "squared" waveform is called clipping, literally the top of the wave form is clipped off. Clipping can be good if the amp can handle it because it increases power and has the effect of increasing the apparent frequency the sub is reproducing, which usually means translates to greater efficiency from the driver. Just keep in mind you can't run the amp or sub clipped for long periods of time or you'll smoke one or both of them.
Rubbing VCs will usually lead to damaged equipment. And VC's can be off center, ie if you up or down fire a sub, it will sag in the suspension, which will affect the BL curves, etc.
You don't need to be a professional. You just need to understand that music has much less rms output than the sine waves used to establish power handling in a sub. That's why you see so many systems with amps that are ~1.5-2x the subwoofer's rating, but set to no clipping and the sub survives. That suggests 3db of clipping is pretty safe. I wouldn't clip Brazilian amps, but solidly built Korean amps, I'd say you're good.While I try to discourage the "Clipping is Okay" mantra (as for novices and even regulars it is a device better left to professionals), I agree with what you’ve stated.
I get it but sometimes a little knowledge can be dangerous. Even with the Korean amps that I run (and I’m a fan) or the Focal a/b's that I run, I'm of the school that says double your amplifier output needed versus squeezing every last drop just to play there kind of thing. SPL versus SQL. Different folks, different strokes.You don't need to be a professional. You just need to understand that music has much less rms output than the sine waves used to establish power handling in a sub. That's why you see so many systems with amps that are ~1.5-2x the subwoofer's rating, but set to no clipping and the sub survives. That suggests 3db of clipping is pretty safe. I wouldn't clip Brazilian amps, but solidly built Korean amps, I'd say you're good.
The shape doesn't create DC. The shape creates higher AC voltage and thus higher AC current and higher RMS power and more heat.That's just splitting hairs. You’re elaborating on what was already said. The shape provides the conduit for DC to enter into the circuit. The shape is relative not responsible. What I said was not theory, it's a fact. It's what is being pumped that changes the heat value, the duration, etc, are all part of that equation, not the fact there is a force reaction up or down as would be present when any voltage is applied, unless shorted. In the end, it leads to driver failure. Running shorted drivers or speakers, can be or running an amplifier to clipping for long durations, will be detrimental to the amplifier and the speakers. To answer the OP, he’s got a driver with a mechanical fault; it could (will be) be problematic for the amp too. That is the answer to the question.
Didn't say it creates it.The shape doesn't create DC. The shape creates higher AC voltage and thus higher AC current and higher RMS power and more heat.
Depending on what is causing the coil issue to begin with, yes, definitely.Could that happen in the first time ever using the amp though? While hooked up to the rubbing coil?
That's user error you're describing...you can run a 100w amp to drive a 1k rms sub without damaging anything...just set your gain properly and you're golden...granted the sub will not get loud but you won't hurt the driver under powering it...In my experience I have seen far more woofers or large diaphragm, low freq. drivers ruined than high freq. speakers like tweeters from under-powering. That’s because they have crossovers (usually utilizing 250v caps or better where the subs, not so much). In the case of under-powering, the driver is blown because the amplifier is driven to the point that it can no longer amplify the signal.