Most soundbars come with all the fancy processing and amplification built-in, but some strip it all out and just include the speakers. Trouble is, these ‘passive’ soundbars need an AV amp to drive them, which can be costly. Yamaha provides a solution with the YHT-S400 system, which comes with the soundbar and amp in a single box. Find out how this unusual pairing performs in our Yamaha YHT-S400 review.