Got an Airport Extreme, want to Airplay with Express?

I have an old Airport Express (the one that plugs into the wall) and recently replaced with an Airport Extreme.

The older 802.11g (model# A1084) and the 1st generation 802.11n (model# A1264) AirPort Express base stations look identical. Which one do you actually have?

...however now we don't have our AirPlay speakers. I want them back, and was wondering if there was any way I could have the Airport Express set up JUST for AirPlaying those speakers.

Yes, you can have the Express configured to join the Extreme's wireless network as a wireless client. Since the Express will be a wireless client it will perform like any other client on the network. That is, it will not be broadcasting a wireless network, nor performing as a router.

Thanks for this. I set up my Express (second gen) and was immediately prompted to use it as a range extender, however that was my only option. I just gave it crummy internet preferences to avoid devices from prioritizing it for internet. I'm all set now!

Edit: I am the OP however My  ID log-ins are all messed up.

"I set up my Express (second gen) and was immediately prompted to use it as a range extender, however that was my only option."

As Tesserax has mentioned, the AirPort Express can be easily configured to "Join a wireless network", and function as a wireless client. It does not "extend" the network at all when it "joins" the network, it simply becomes a client of the network like other wireless devices.

The USB port is active in this type of setup as well as the Ethernet ports.