Pardon my ignorance

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Bought a Sony AV receiver and some speakers some time ago with a view to some day adding a subwoofer to it. Bought a cheap subwoofer recently on ebay but (embarassingly) the sub is passive whilst the system requires an active sub. Is there any way you can convert or add an in line amplifier?

AV Receiver is a Sony STR DE495

SD 42 HK
 
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