Members race81 Posted September 16, 2013 Members Share Posted September 16, 2013 SP118..............smelled something a few weeks back....stopped working this past weekend. What can you tell me about this? Link to comment Share on other sites More sharing options...
Members Coaster Posted September 16, 2013 Members Share Posted September 16, 2013 coil is burned. replace basket. perhaps limit to rms Link to comment Share on other sites More sharing options...
Members race81 Posted September 16, 2013 Author Members Share Posted September 16, 2013 when we started smelling it...it was powered by a pv1500 in bridge@4 ohms.....when it was being pushed, the amp would not keep up.....could underpowering the speaker cause this? We have since updated the amp so not to lose power. Link to comment Share on other sites More sharing options...
Members dboomer Posted September 16, 2013 Members Share Posted September 16, 2013 The answer is that the speaker was overdriven for too long a time. But the answer is more complicated than just the Watts. First ... the power handling rating is not a guarantee it is a spec that reflects performance only when a specific set of factors are present. Live music is more complicated. One of the requirements for that power spec is that the amp that is delivering the 600W be capable of cleanly delivering 2400 Watts and clearly that was not the case here. Another requirement of the power handling spec is the shape of sound which I'm guessing is hard for almost everyone to ensure. Just out of curiosity ... how long have you been using this speaker before the problem? Normally using a 1000W amp with a 600W speaker is not a problem. But you've bridged an amp and exceeded the capabilities of that amp. It should not drive 4 ohm loads. It is rated to handle 8 ohm loads. This is one of the inherent problems when you bridge power amps. The result is that you drive the amp into current limiting much more than would normally happen if you had followed the manufacturer's recommendation. You wont hurt the amp by doing it incorrectly but it has negative effects on the speaker as you now know. The second thing ... and in my opinion what really went wrong ... is that you are expecting more performance from your system than it is capable of. The speaker failure was caused by bad driving. It should have sounded like crap long before any damage was done and that went unnoticed. Link to comment Share on other sites More sharing options...
Members race81 Posted September 16, 2013 Author Members Share Posted September 16, 2013 dboomer wrote: The answer is that the speaker was overdriven for too long a time. But the answer is more complicated than just the Watts. First ... the power handling rating is not a guarantee it is a spec that reflects performance only when a specific set of factors are present. Live music is more complicated. One of the requirements for that power spec is that the amp that is delivering the 600W be capable of cleanly delivering 2400 Watts and clearly that was not the case here. Another requirement of the power handling spec is the shape of sound which I'm guessing is hard for almost everyone to ensure. Just out of curiosity ... how long have you been using this speaker before the problem? Normally using a 1000W amp with a 600W speaker is not a problem. But you've bridged an amp and exceeded the capabilities of that amp. It should not drive 4 ohm loads. It is rated to handle 8 ohm loads. This is one of the inherent problems when you bridge power amps. The result is that you drive the amp into current limiting much more than would normally happen if you had followed the manufacturer's recommendation. You wont hurt the amp by doing it incorrectly but it has negative effects on the speaker as you now know. The second thing ... and in my opinion what really went wrong ... is that you are expecting more performance from your system than it is capable of. The speaker failure was caused by bad driving. It should have sounded like crap long before any damage was done and that went unnoticed. Thanks dboomer............We have been using this configuration for over two years with no problems and sounded great. only noticed a problem after an outdoor event when pushing the main levels a bit. I really suspected it was something clipping, and gone un noticed as we run things from stage. I appreciate the reply. Link to comment Share on other sites More sharing options...
Members agedhorse Posted September 17, 2013 Members Share Posted September 17, 2013 dboomer wrote: The answer is that the speaker was overdriven for too long a time. But the answer is more complicated than just the Watts. First ... the power handling rating is not a guarantee it is a spec that reflects performance only when a specific set of factors are present. Live music is more complicated. One of the requirements for that power spec is that the amp that is delivering the 600W be capable of cleanly delivering 2400 Watts and clearly that was not the case here. Another requirement of the power handling spec is the shape of sound which I'm guessing is hard for almost everyone to ensure. Only under ideal conditions. I would have to say that most conditions are so far from ideal as to be laughable. Link to comment Share on other sites More sharing options...
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