Used Polycom Vortex EF2241 Microphone Matrix Mixer 4 Channel

Polycom Vortex EF2241 Automatic Mic or Matrix Mixer - Untested

Polycom Vortex EF2280 8-Channel Mixer and Noise Cancellation with Power Supply

Polycom Vortex 4 Channel Audio Mixer EF2241

Polycom Vortex EF2241 Automatic Mic or Matrix Mixer - Tested Working

Polycom Vortex EF2280 Multi-Channel Echo Noise Cancellation

Vortex EF2241 Polycom 2201-12241-601

LOT OF 3 Polycom Vortex EF2280 Multi-Channel Audio Matrix Mixer