This product is must for PA &
Tweeter Horn Protection! - TWEETAGUARD - solves a common problem . .
The problem with nearly all passive and active loudspeaker systems is the high frequency compression driver (tweeters/horns), these are by there very nature highly vulnerable to damage and failure.
Apart from badly overdriven clipped systems, a major cause is that modern digital audio techniques use copious amounts of compression, which can in nearly all cases more than double the average voltage being fed into a loudspeaker system.
Most of the major companies now try to protect their products by fitting a bulb in parallel with a ballast resistor or poly-switch (PTC = resettable fuse), but both these methods have limited success, because the bulb invariably blows putting the entire load through the resistor which eventually fails as well; PTC’s also suffer from progressive switching fatigue - they trip earlier & earlier and at a lower power each time.
Basic Causes of Clipping and Tweeter Horn Driver Failure
Clipping means that the peaks of the audio signal are being “clipped off” or “flat-topped” when the signal level exceeds the maximum capability of a power amplifier or another piece of equipment within the sound system.
During the time the signal is flat-topped, the speaker is not being “told” to move, as it is receiving a partial DC signal. Which means much of the power will go into heating up the voice coil instead of making it produce sound.
During the time the signal is clipped a loudspeaker is a 100% efficient at converting that DC content into heat. And the more efficient the driver, the worse the problem.
A horn tweeter is nominally 25% efficient and will normally convert 75% of the input power into heat, but during clipping it will convert 25% more of that power to heat.
The woofer is only around 4% efficient and normally converts 96% of the input power to heat, so during clipping it only has to convert a mere 4% into heat. This is why tweeters burn out much more easily.
A hidden consequence of clipping is that, while high frequency drivers are more efficient in converting electrical power to sound, as they have a lower mass than a woofer.
The mass translates into thermal inertia, so the higher the thermal inertia the more it takes to change the temperature of the mass. This means that high frequency drivers can heat up faster than bass drivers.
This is especially true during clipping because the driver is converting most of its input power from the amplifier into heat when the signal is clipped.
1) Any clipped signal can blow a loudspeaker. It does NOT matter if it is caused by the mixer, amplifier OR any other piece of equipment in the system OR whether the amp is at full output.
2) A major cause of driver failure is using too small an amplifier. If the amplifier is driven into clipping, it can burn out a loudspeaker that has a power rating HIGHER than the amplifier.
3) Loudspeaker power ratings are valid only for un-clipped input signals.
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