Practical Boat Owner - - Practical -

I took a reading with an iPhone app be­fore and after, held 10cm above the ex­haust. With the old, un­si­lenced ex­haust, it av­er­aged 91.4dB. With the new it av­er­aged 79.4dB. That 12dB is enough to make an ap­pre­cia­ble dif­fer­ence – re­mem­ber that deci­bels are a log­a­rith­mic scale, so the per­ceived vol­ume is ap­prox­i­mately halved. Walk­ing down the pon­toon you can now hear a gen­tle hum, whereas be­fore there was an in­tru­sive roar. It’s made a big dif­fer­ence and I no longer feel guilty about fir­ing up the heater in a quiet an­chor­age!

BE­FORE The reading av­er­aged 91.4dB AFTER A much lower 79.4dB av­er­age

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