That would be during play back through my home stereo with two 12" subs. (referring to the HPF switches and not hearing any differences)
Part of Grace's response ...
As described on pages 3 and 8 of your V3 owner's manual, the V3 features
a highly configurable high pass filter section. The front panel
switches select the corner frequency of the filter section. Position 1
is a higher corner frequency and position 2 is a lower corner frequency.
The corner frequency can be selected via internal jumpers. Either
100Hz/50Hz or 125Hz/75Hz. The filter characteristic is also user
selectable between active and passive. In passive mode, the slope of
the filter is a subtle 6dB/octave. When placed in active mode the curve
is more aggressive at 12dB/octave.
If you have not adjusted these jumper settings, your unit is probably in
the 100Hz/50Hz and passive (6dB/octave) mode. Depending on your source
material / acoustic recording environment/ mic setup, the low end cuts
of the high pass filter may be subtle and difficult to hear.
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I had to send back my V3 after just two weeks because the ANSR wouldn't turn on. Grace will double check the HPF switches since they will have my unit anyway. Sucks to be without my V3 even for just a little while.