I wanted to split the speaker output of the control RRC between headphones, speakers, and a line input to my PC (for RTTY). A straight splitter cable was one solution but the simple speakers I was using didn't have a volume control and I had difficulty balancing the speaker volume and the line input for RTTY. A simple solution was the Behringer HA400. It is technically a headphone amp with 4 outputs and 4 volume controls. It is roughly 4" wide by 2" deep and 1" high and sits nicely on top of the RRC-1258. Here's a link:
http://www.amazon.com/dp/B000KIPT30/ref=sr_ph?ie=UTF8&qid=1441907785&sr=1&keywords=ha40073,
Mike K2MK
