I bought this to add a 2nd user 2.1 output to a project. I already have an LP-168HA with great bass. The characteristics of the LP-168S are similar but better than those of the LP-168HA. However, the LP-168S has SIGNIFICANTLY less bass. I ended up using the 168S for 2 channels and relocated my 168HA to work with the subwoofer which I relocated. feels like about 20% of the power of 168HA. If it was defective, perhaps MFG should send a replacement. I probably should have returned it to Revain on day one, but it was a weekend project and at the time I didn't want it to fail and wasn't interested in taking it apart again. I would recommend the 168HA version based on my experience.
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