当低音炮的输出声压提高到一定程度，由于单元结构上的原因或功放热效率上的原因，会发生功率压缩（Power Compression）。一旦发生功率压缩，低音炮的输出声压将停滞在一定数值上而无法再提高，而失真度会发疯地上升。
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Each day he clamped a Lange V9 ski boot onto the metal stem of an 8-foot-high Instron compression machine and flipped the power switch.
FORBES: Magazine Article
Each day he clamped a Lange V9 ski boot onto the metal stem of a 2.5-meter-high Instron compression machine and flipped the power switch.
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The higher the compression ratio, the higher the power output and the higher the thermal efficiency.
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