[mythtv-users] Life with both ATSC and NTSC tuners

[Raymond Wagner]

On 8/12/2011 09:58, Adam Felson wrote:
> 1) There doesn't seem to be any way to match the gains of the two tuners.  I can attenuate the convertXs tuners, but not not the HDHRs.  Unfortunately it is the HDHRs that are about 10db louder than the convertXs.  Every time I switch from watching an NTSC program to an ATSC program I get blasted by the volume difference.

ATSC tuners have no way to control volume, or resolution, or bitrate, or 
anything.  They are a digital tuner, meaning the content is 
pre-compressed by the transmission source.  They merely receive the data 
stream as it comes to them.  That means the ATSC tuner is not 10db 
louder, but rather than NTSC tuner is 10db quieter.  Does your ConvertX 
have no volume controls?  Perhaps you can insert a preamp into the ALSA 
chain prior to MythTV capturing it.