High pass filtering is endemic in audio systems. It's no secret that if the
corner frequency of a high pass filter is set high enough, it will be
audible.

A quick analysis suggests that any practical playback system can be
characterized as being at least a third-order high pass filter, while a
complete record/play system can be characterized as being at least a fifth
or sixth-order high pass filter. Typical complete record-playback systems
may be of far higher orders, with the tenth or 15th orders being quite
likely.

Typical sound reinforcement systems can be characterized as high pass
filters with corner frequencies on the order of 50-85 Hz.

Typical well-engineered analog (vinyl) high-quality home audio systems can
be characterized as high pass filters with corner frequencies of no less
than 13 Hz.

Typical digitally-based high quality home audio systems can be characterized
as high pass filters with corner frequencies on the order of 1 Hz or more.

So, how low of a frequency can a high pass filter be set to, and still be
reliably audible?

I predict that many will be surprised how low they must go to avoid audible
effects from high pass filtering.

BTW, the audible effect of high pass filtering is something like a timbre
change.

Listen for yourself and reach your own conclusions!

Web site introduction:

http://www.pcabx.com/index.htm

High pass filter listening tests:

http://www.pcabx.com/technical/high_pass/index.htm

It's all good and it's all free!