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Design and Implementation of a High Efficiency Subwoofer

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The demand for battery driven loudspeakers is increasing but the challenge of efficient low frequency reproduction remains. An alternative approach to the conventional 4th order bandpass enclosure design for a subwoofer to achieve a high peak in the passband and increase voltage sensitivity is investigated. The response is corrected with DSP to ensure a flat response in the passband. The results proved that this approach can increase the voltage sensitivity dramatically, reaching an average sensitivity of over 100 dB in the passband from 45 Hz to 90 Hz. It also showed that the design is sensitive to construction errors. Precise assembling is required to achieve satisfactory results while small errors can ruin the purpose of the design.

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AES - Audio Engineering Society