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(2) Boston Acoustics SPG-TR TunableRadiators - $50 ea.
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Would you like to add extra bass to your system without taking up extra space or adding more power? Boston's SPG-TR TunableRadiators are "passive radiators" — shallow, non-powered speakers designed to be used in conjunction with Boston SPG555 subwoofers. When mounted into a box along with an SPG555 sub, the radiator's cone moves in response to the air pressure created by the powered sub, reinforcing bass output without requiring extra power.
Adding this SPG-TR passive radiator to a sub box with an oval SPG555 subwoofer can increase output by up to 3 dB — that's almost twice the volume. And, since it's only 4 inches deep, you can add it to almost any sub box. The SPG-TR has three tuning modes, allowing the listener to adjust the sound and bass output to their musical preferences and box size.
oval passive radiator for use with Boston's SPG555 component subwoofer
copolymer woofer cone with foam surround
three user-adjustable tuning modes
required mounting depth: 4"