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The SPL of a buzzer does not have a geometric ratio relation with the voltage directly, especially close to the rated frequency.

According to the graph below, at 2000Hz, we have 3V with 74dB, 6V with 80dB, and 12V with 90dB results;

however, at 2048Hz, we have 3V with 84dB, 6V with 87dB, and 12V with 90dB.

Because the bandwidth of the buzzer will widen when the voltage raises, therefore we should pay more attention to the output frequency,

even 100Hz difference might cause a big difference in 10dB!

蜂鳴器的音壓大小,並不會直接和電壓的大小比例上的關係,尤其是在額定頻率的附近,

請注意看下圖的2KHz, 3V的時候大約是74dB, 6V是80dB, 12V是90dB.

但若是在2048Hz左右, 3V是84dB, 6V是87dB, 12V是90dB.

因為蜂鳴器的頻寬,也會因電壓的昇高而變寬,故在選擇線路輸出時的頻點,也需要特別注意,

差了100Hz,也許就會差到10dB的音壓,相差非常大的!!