How to stream music from stereo onto Airport wireless system

Question

I have an Imac and 2 stereo systems connected to their own airport express.  I can stream music from Itunes on my Imac to either stereo with no problem using airfoil software.  My question is can I use the apple network to play music FROM one stereo to the other stereo's speakers.  I want to do this because i have an old turntable connected to one stereo and would like to listen to it on my other stereo speakers sometimes. 

Answer 1

I'm having the same but have thought of a solution. 
First, it is a shame that others such as Tesserax are familiar with the capabilities of said products but offer no real creative solutions.  At one time I did consider myself the finest most creative solution providing technician in Los Angeles, yes working for the finest company on the planet (use your imagination), however, my time although not shortlived, did come to an end due to disagreement or two.  Long Live Vinyl, Praise the Turntable Sir (or Madam).
Now, Think outside the box.  No the stereo won't do it.  No the turntable won't.  Let's face it the impedance of the turntable's audio out is of no issue since you'd like to connect the stereo to the MBP (nice job on using fancy words kinda out of context Tesserax, way to cop out.).  So, given that the unit in question does have a stereo in, and the stereo itself does have a stereo out, then we do need something to bridge the connection.  Within this theory is a few options. So what's it gonna be my friend, wired, or wireless?
1. Connect MBP and Stereo (example implying that there is an RCA audio output, can be subbed with a headphone jack of 1/8 or 1/4 inch varieties)
     -Wired connection, STEREO to RCA/female 1/8 stereo to CABLE 1/8 stereo on both ends to MBP audio input.
     -Wireless connection, STEREO to RCA/female 1/8 stereo to BLUETOOTH TRANSMITTER to BLUETOOTH RECEIVER to MBP audio input.
2. Software
     -Purchase Airfoil
     -Fire up GarageBand create an audio track and monitor the input of the track (MBP audio in).
     -Tell Airfoil to stream audio anywhere you want on your network.
3. BAM enjoy, you can even get airfoil speakers, a great app, to do the dirty work of other airplay supported goodies.  That will turn your iOS stuffs, other macs, PCs, all into zones to stream to.
I haven't tested this yet, sounds pretty obvious, kicking myself for not thinking of it earlier.