If you drive your amp from the headphone output, naturally you'll need a stereo headphone to two male rca adapter you get these just about anywhere for a couple of bucks.
http://www.ebay.com.au/itm/New-6-5mm-Aux-Male-to-2-RCA-Female-Socket-Adapter-Y-Splitter-Connector-Converter-/291121613799?pt=LH_DefaultDomain_15&hash=item43c8334be7
Or just use the fixed line out with a decent 10kohm passive preamp like the Schitt SYS $49 which uses Alps 10kohm Logarithmic Volume Pot.
http://schiit.com/products/sys
Cheers George
http://www.ebay.com.au/itm/New-6-5mm-Aux-Male-to-2-RCA-Female-Socket-Adapter-Y-Splitter-Connector-Converter-/291121613799?pt=LH_DefaultDomain_15&hash=item43c8334be7
Or just use the fixed line out with a decent 10kohm passive preamp like the Schitt SYS $49 which uses Alps 10kohm Logarithmic Volume Pot.
http://schiit.com/products/sys
Cheers George