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 18 (click to view)
Adjusting the sound
You can adjust the sound characteristics to your preference.
Reinforcing the bass sound
You can also adjust the level of Super Bass.
Select the item you want to adjust.
Each time you press the button, the adjustable items change as follows:
EQ Canceled S.BASS L.V.METER
While adjusting Super Bass, the BASS indicator flashes.
As the number increases, Super Bass level also increases.
Adjust the R06 (rear only) front and rear speaker F06 (front only) Adjust the left L06 (left only) and right speakers R06 (right only) Adjust the volume 00 (min.) 50 (max.)
Adjust the level within the range of â00â to â08.â
BAL (Balance) VOLUME
If you are using a two-speaker system, set the fader level to â00.â
Adjust the level.
Note: Normally + / â buttons work for volume adjustment. So you do not have to select âVOLUMEâ to adjust the volume level.