Originally Posted by phillyd
Figured I should share that you can split a line-level RCA signal using split adapters and run a line to speakers and a headphone amp with no (noticeable) signal degradation or issues. Even if both devices are on, there are no problems.
In my case, I'm splitting my Schiit Modi to my Vali and my speakers. Works great!
I can confirm that there is no problem doing this that I have ever seen. If you have the ability to make cables you might want to make a custom cable that is split. I'd probably use all 4 conductors all the way to the start. Do 2 sets of twisted pair and untwist them where they split off. It will be cheaper and sound as good or better than anything you can buy especially considering the use of a splitter. Keep the gauge super thin and pay attention to preventing any corrosion if you are using copper. If you use silver you don't need to worry about corrosion at all (the corrosion doesn't cause audio issues like it does with copper).
If you haven't made cables before and you are doing this it might be a good time to play around with it if you think you are up to the challenge.
Just do some reading on several DIY cable making write ups. You want to read the point of view of several DIY people. Some will mention things that others forget. All in all though you could go on eBay and get a huge spool of silver, spool of very small gauge shrink wrap (goes around the silver), spool of small gauge shrink wrap (optionally goes around the multiple strands of silver), spool of sleeve (optionally goes around the finished products), and a little bit of medium shrink wrap (goes around the sleeve at the ends) cheap RCA terminations (solder on type), solder with silver in it (doesn't need to be expensive) and you can make a bunch of custom cable for the price of cheap cables that don't sound as good.
For longer runs pay attention to DIY recipes that have shielding but for short runs or medium runs that stay away from power cables or cross them at 90 degrees you don't need shielding. If you are going to build DIY cables DON'T build a shielded cable as your first cable.Edited by givmedew - 2/6/14 at 9:56pm