MartinLogan Depth Series Subwoofers Plunge Into the Lower Depths — Down to a Bone-Rattling 18Hz
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MartinLogan's Depth Series subwoofers are reported to have an extended frequency range. The subwoofers are said to be capable of producing sound as low as 18Hz. This low frequency range is described as having a intense physical effect, being characterized as bone-rattling.