I purchased a used pair of Bose 901 series VI with equalizer. I am driving them with a late '70s Pioneer SX-780 with 45 watts per channel. The problem is, I do not have as strong bass as I remember these speakers having. The problem may be with their placement. I have them both in front of a floor to ceiling glass wall. I am guessing that they need a wood wall of some kind to reflect the bass. Any input would be greatly appreciated.