I need to hear some threshold, which may only be one or two clicks within several seconds.
Because there is no SAT (Self Adjusting Threshold) on the AQ1B, the unit can drift way below "just silent" and may require a half or full turn of the SET AUDIO to bring it back in range. There is a definite reduction in sensitivity but it is more of a case of the unit may be alerting you to a signal but may not be able to ramp up the signal to something that you can actually hear.
It is tempting to run the unit silent because you can avoid (can't hear) any EMI or saturated audio from a range of factors.
With bigger targets then the unit will respond with something you can hear even if you are below a silent audio.
I am prepared to put up with some noise because I want to also pick up the smaller targets as well. My left thumb and forefinger are nearly always positioned on the SET AUDIO control and so I tweak/tune it regularly.
I hope this helps and makes some sense.
HH
Tony.
PS....I believe Jollymon is looking for bigger targets so the way he runs his detector is perfect.