Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Needs variable woofer control

I purchased this white unit after owning a black one. The black one, exact same same model number, has a woofer output control on the right speaker. This one lacks the control. You really need to be able to control woofer output, as some music hasn't enough, some has way too much, and the woofer rattles and clatters, and some, Goldilocks, is just right. But most is not just right, therefore, beware if you are expecting woofer control, there isn't any.