Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Actually, I was looking for this information for 3 years!...now thanks to you, the manual is on my hands and of great help, cause I understand now where I was doing wrong connections and wires...excellent, I'll be back to you if in need, thank you.
Text excerpt from page 9 (click to view)
OPERATION STEREO STEREO mode is the most frequently used mode among the three. Each channel is independent of the other, carrying its own input signal, with its own gain control. Stereo mode comes in left and right channels (See Figure 5). A) When one channel is assigned for left channel, make sure the other channel is assigned for the right. B) User can use the unit for mono output, with one as main and the other as monitor. C) This power amplifier can also be used for biamplification. One channel for driving low frequencies while the other for driving high frequencies.
