inputs.text: hd hd2 - took chance purchasing alpine tuat550hd hd radio tuner use current alpine head unit ivaw205 done research read reviews several sites mixed good bad installed pretty straight forward relatively easy figure \\daisy chain\\ ainet cable ivaw205 hd tuner pxah701 processor order man improvehement sound quality selection stations turned systehem able see instantly receiving hd signals stations multicasthd2 frequency well get see station info song title bandsinger name thing cannot done id tagging iphone due limitation ivaw205 overall satisified purchase