1.2G file made with Ardour3 export:
ken@kenslap3w:/home/church/sermons/web/2014> sndfile-info 2014-09-21-low_session.wav

Version : libsndfile-1.0.25-exp

========================================
File : 2014-09-21-low_session.wav
Length : 1869240288
RIFF : 1869240280
WAVE
fmt  : 16
  Format        : 0x1 => WAVE_FORMAT_PCM
  Channels      : 2
  Sample Rate   : 220500
  Block Align   : 4
  Bit Width     : 16
  Bytes/sec     : 882000
data : 1869240244
End

----------------------------------------
Sample Rate : 220500
Frames      : 467310061
Channels    : 2
Format      : 0x00010002
Sections    : 1
Seekable    : TRUE
Duration    : 00:35:19.320


234M file made with Ardour2 export:
ken@kenslap3w:/home/church/sermons/web/2014> sndfile-info 2014-01-19-low.wav

Version : libsndfile-1.0.25-exp

========================================
File : 2014-01-19-low.wav
Length : 234474452
RIFF : 234474444
WAVE
fmt  : 16
  Format        : 0x1 => WAVE_FORMAT_PCM
  Channels      : 2
  Sample Rate   : 22050
  Block Align   : 4
  Bit Width     : 16
  Bytes/sec     : 88200
data : 234474408
End

----------------------------------------
Sample Rate : 22050
Frames      : 58618602
Channels    : 2
Format      : 0x00010002
Sections    : 1
Seekable    : TRUE
Duration    : 00:44:18.440
Signal Max  : 32768 (0.00 dB)