That's a common misconception, "needing an audio panel"!
Newer 150's and all 152's already have provision for all the audio switches you'll need, in the eyebrow panel. Newer nav/coms have sidetone, built in audio amps that are powered even with the radio off, and audio isolation (wired into the switches above) for at least 3 and up to 7 inputs. The only thing extra needed is an audio isolation relay used when dual nav/coms are installed (cuts out the ships speaker on transmit) that mounts behind the panel out of sight. Dingbat is set up this way!
See? I just saved you one whole slot! <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />
That would be great - but without an audio panel, would I be able to listen to both COMs while transmitting on just one? I thought that was audio-panel territory.
The panel I got is a KMA-24 with built-in marker beacon. However, I could also use a separate marker-beacon receiver (I have a King stand-alone unit as well).
The other 'requirement' is stereo-intercom with music input.
If all that can be combined without an audio panel, that would be great.
My plane has none of the switches found on the later models, though I suppose it's simple enough with the right schematic.
