What is "power compression"?

Speaker voice coils are made of copper or aluminum. As these voice coils increase in temperature during normal operation, the DC resistance of the voice coil increases. Greater voice coil resistance means less power transfer from the amplifier. As a result, the speaker will not play as loud when it's "warmed up" as it did when it was "cold". Some speakers may exhibit 3 to 6 dB of power compression. This means that power compression can have the same effect as taking away half of your PA!

JBL has gone to great lengths to reduce the effects of power compression. Our VGC™
(Vented Gap Cooling) and TTM™ (Total Thermal Management) technologies effectively
dissipate heat for reduced power compression and increased reliability. In addition, some
models use liquid-cooled (ferrofluid-cooled) voice coils.

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