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Audibility of high pass filtering
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! |
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