Yes, audio will pass through to the projectors speakers when connected with HDMI cable. Update...it's been awhile 9 months with the iSival..still working great, no problems to report 
Over the last few months I've managed to improve the image quality quite noticeably by doing a few things. First I purchased proper window blinds and have a much darker room than ever before..Imediatley I notice a much imroved black level and overall picture...got that wow factor all over again..lol...Also through lots of experimentaion, COOL color mode seems the best..It offers perfect grey levels from white to black without any GREEN TINGE at all..not even a hint of it..so dark content is devoid of the issue..I solved this while playing DEAD SPACE PC game..Alot of GREEN in dark areas under Normal and STANDARD modes...caused me to really look into it and find a solution..I did..However, it would be great to get the green tinge removed in other modes such as Normal and Data since DATA will output more lumens.
The one thing I currently will experiment with is the HDMi pixel format settings..I installed new drivers that allow me to select from 4 choices all under 720p..Before I could only select 2 under the same screen resolution..so the updated ATi Videocard driver fixed this..And one last thing..ATi driver in video playback settings has a dynamic contrast ratio option setting..when enabled this helps the iSival in one particular way, it will dynamically boost dark scenes a bit..resulting in much better image detail that would otherwise be lost due to the contrast ratio...Very handy feature but only works with Windows Media player and other direct show players. Still some people may prefer to turn it off..it highly depends on the video content. You do get much nicer black levels with ATi Dynamic option turned off...

Over the last few months I've managed to improve the image quality quite noticeably by doing a few things. First I purchased proper window blinds and have a much darker room than ever before..Imediatley I notice a much imroved black level and overall picture...got that wow factor all over again..lol...Also through lots of experimentaion, COOL color mode seems the best..It offers perfect grey levels from white to black without any GREEN TINGE at all..not even a hint of it..so dark content is devoid of the issue..I solved this while playing DEAD SPACE PC game..Alot of GREEN in dark areas under Normal and STANDARD modes...caused me to really look into it and find a solution..I did..However, it would be great to get the green tinge removed in other modes such as Normal and Data since DATA will output more lumens.
The one thing I currently will experiment with is the HDMi pixel format settings..I installed new drivers that allow me to select from 4 choices all under 720p..Before I could only select 2 under the same screen resolution..so the updated ATi Videocard driver fixed this..And one last thing..ATi driver in video playback settings has a dynamic contrast ratio option setting..when enabled this helps the iSival in one particular way, it will dynamically boost dark scenes a bit..resulting in much better image detail that would otherwise be lost due to the contrast ratio...Very handy feature but only works with Windows Media player and other direct show players. Still some people may prefer to turn it off..it highly depends on the video content. You do get much nicer black levels with ATi Dynamic option turned off...











