2-port 110 ohm AES adapter. 8500 with any of 8510, 8410, 8415 audio sub modules when only two AES ports are desired (in order to allow access to four SDI outputs); Requires one per 8500. 8400 with any of 8510, 8410, 8415 audio sub modules when only two AES ports are desired (in order to allow access to four SDI outputs); Requires one per 8400. 5330 with 6330 Audio Sub module when only two AES ports are desired (in order to allow access to four SDI outputs); Requires one per 5330. 5230 with 6230 Audio Sub module. Requires one per 5230. 7550 with 8415 Audio Sub module. Requires two per 7500 for full access to all four AES ports (just one for two ports). 7600 HD Mux/Demux requires two per 7600 for full access to all four AES ports (just one for two ports). 7900 with 8415 Audio Sub module requires two per 7900 for full access to all four AES ports (just one for two ports). 7910 with 8415 Audio Sub module requires two per 7910 for full access to all four AES ports (just one for two ports). 7920 with 8415 Audio Sub module requires two per 7920 for full access to all four AES ports (just one for two ports). 7930 with 8415 Audio Sub module requires two per 7930 for full access to all four AES ports (just one for two ports).