MaxDistance for BoomBox...

Hello everyone ) Some body be able make edit "maxDistance" for "BoomBox"?

I try:

AudioSource audio_test = boombox.BoxController.GetComponent<AudioSource>();​
but have error:
The type `UnityEngine.AudioClip' has been forwarded to an assembly that is not referenced. Consider adding a reference to assembly `UnityEngine.AudioModule, Version=*.*.*.*, Culture=neutral, PublicKeyToken=null​

I'm pretty sure that's a client side component. Just an educated guess, but this likely cannot be changed via a server side component.