https://fi.yamaha.com/en/business/audio/products/interfaces/my4-aec/
MY4-AEC - Overview - Interfaces - Products - Audio - Yamaha - Business - Finland
4-Channel Acoustic Echo Canceller Card for Yamaha DME64N/24N/MTX5-D/MRX7-D
aec overviewinterfacesproductsaudioyamaha