Energy and frequency

DC has a pretty low frequency...like zero.

"blowing" an amp can occur for many reasons. Components can age and fail or they can be over stressed electrically, mechanically or thermally. These stresses can cause the components or their connections to open or short. You've ask a very broad question there.

A speaker can be blown from the failure of the mechanical suspension of the cone or the coil can become shorted or open.

What you mean is that higher frequencies require less excursion for the same sound pressure level than bass. When the max. excursion is reached the voice coil bumps against the pole plate in the back gets deformed and eventually destroyed. It is also true that higher frequencies contain more energy in normal music and voice material. With music the maximum is around 800Hz. Amplifiers are blown by short circuits or very low impedance loads if they do not have a current limiter built in. They are also blown by overtemperature, which can be created with too high a level, too high ambient temperatures and poor cooling(i.e. covering the cooling fins).

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ciao Ban
Bordighera, Italy

First of all, your ears are less sensitive to low frequencies (they are most sensitive around

1k-4k, falling off above and below that). And since many folks like gut-thumping bass, there can be a lot of watts involved before your ears complain.

But second of all, your statement isn't always the case. In pro sound systems (nightclubs, etc) which are cranked up a lot, it's often the tweeters that give out first. This typically happens from overdriving the amp so that it clips. The signal that is causing the clipping is typically low frequency (those gut-thumping bass lines) but the clipping distortion is much higher and goes to the tweeters. Since tweeters are typically rated for much lower power than the woofers in a system (due to normal hearing sensitivity), they can't handle the power due to clipping and blow out.

Best regards,

Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis

Home of DaqGen, the FREEWARE signal generator

distortion is the speakers worse enemy.

distortion can hold a speaker cone at a flat setting position due to the amp flat topping from saturation. this effect causes heating in the coil and cone deformity.

complex audio requires a good size Amp (not to be used at distortion levels) to transfer all of the multiple sounds to the speakers with out depreciation of any instrument being heard.

And many amps are not designed to be used at full power of 100% duty cycle especially with out proper ventilation and heat sinking.