I purchased a Philips shelf stereo system with the intent to use my in-wall speakers instead of the speakers supplied. However, this unit has two sets of outputs for each speaker. One set is for the low frequencies (Base and mid range) and the other is for higher frequencies (mid range and tweeters). Unfortunately if I hook my in-wall speakers to either output, I lose a huge range of sound. Does anyone know how to SAFELY wire both sets of outputs to a normal speaker? Please see wiring diagram below: