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  1. M

    small preamp for sub already attached to AV receiver?

    Thanks, stupid question but what does a line-level amp actually do/what is it used for? Thanks
  2. M

    small preamp for sub already attached to AV receiver?

    Hi, a friend gave me this small 0-15db preamp to boost my sb-1000 subwoofer but it is already connected to the yamaha av receiver (rxv-681). Would this do anything at all and how do I even connect it to the sub? thanks
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