The bose eq. was made to work for the bose speakers only. Do not use it on other speakers. Use it only in the channels that you use the bose speakers in. It is not an EQ. in the true nature of a graphic eq. Do not use the pre outs for the front L+R as it will then effect those channels sound. If you are going to use the bose in the rear channels then use the rear channel pre outs only.