OK, will be found if it really is there in this DELCO CDR2005, too. If found do you think it is better to cut those mentioned legs or just leave them connected?
Sorry, what "mentioned legs" are we talking about here?
Yes like Andy H proposed I tried to ask that when joining the line out wires to pins 22-25 is it better to cut the pins totally so that the signal goes to line out only. Although the speakers will be connected to the new main amp I was just wondering whether the old main amp create problems if pins are connected to it as well. Sorry for the confusion with this foreign language...
Ok, understand now, personally, I wouldn't at this stage not with out looking at what and where its being fed to ( this is where a ccrt diagram would be handy), my reasons would be, 1, it may have DC Voltage or Bias on the outputs that are needed as part of the design to feed to next stage, so this may upset the input to the next stage, 2, the outputs will be designed to be fed to an impedance match, by cutting the pins (isolating / floating the outputs, impedance wise) your effectively relying on an impermanence match to your External Amp.
All you want to do is "sniff" the audio from the outputs via some caps and hope that the audio level is enough to match your Amps input, also by floating the outputs you could change to Frequency Response, Signal to Noise level and or introduce unwanted noise as it could act as an aerial introducing all sorts of unwanted signal, for the latter reasons as well its also important to keep your wiring and earth points clean and together and use a good quality screened cables etc.
Downside is the HU's Power Amps will still be running with Audio Information and not feeding any speakers, should really be a issue, but you could if needed feed the unused speaker outputs with some suitable rated resistors of a higher value of the speakers, 50 to 100 Ohm each would probably do the trick.