How can i connect my subwoffer to my preamp (mark levinson 38) the subwoffer has only line out slot and i dont know where to connect it in my preamp

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You can't hook it up to your preamp. If the sub has speaker level inputs you would use them to hook it up to your amp speaker terminals. The left positive and negative goes to the corresponding left positive and negative at the amplifier and the same for the right channel.
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