For 25 ft I hope you mean Balanced IC's because they should be fine. Rca's wont cut it (too much signal loss with a low output)
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I have Bluejeans LC-1 IC's in my home theater. The shortest are 28ft, longest 33'(rears) and I've been very happy with them. My home theater is a dual purpose (ie 2 channel) systems, and as a baseline I used shorter ICs (Audience Maestro) with my 2 channel before routing the longer set up. It wasn't a scientific comparison, but it was a/b and I didn't notice any adverse impact. It's very quiet, and no loss of signal (that my ears notice)
What is the longest RCA IC (my friend) can run?
It's highly dependent on the capacitance of the cable and the output impedance of your source component. Both should be as low as possible for a long run, or else the upper treble will be attenuated.
Also, the shield quality needs to be as good as possible, in terms of having low shield impedance, and providing effective shielding. That can be hard to assess, though, other than by trial-and-error. Hum and/or noise would result if those factors were inadequate.
See the following thread for some specific recommendations, including the Blue Jeans that were mentioned above: