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Audio and Video Talk
General Discussion
Bass management -- "Large" vs "Small"
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<blockquote data-quote="gbyleveldt" data-source="post: 33610" data-attributes="member: 122"><p>Vaughn, trust me, brick wall filtering does not imply what you stated above. Imagine the kind of slope that what give you that kind of response. While there is no hard and fast rule to indicate what a slope needs to be to be considered a brick wall filter, I think it's safe to assume that anything above 24dB is a pretty steep filter.</p><p></p><p>The concept of a brickwall filter became well known with its use in non-oversampling CD players in the mid-80's. You needed steep filters to handle the frame noise generated by the Nyquist process in the DACs above 20kHz. These where analogue filters from around 24dB and were considered brickwall filters.</p><p></p><p>Need proof? Study any old CDP schematics <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="gbyleveldt, post: 33610, member: 122"] Vaughn, trust me, brick wall filtering does not imply what you stated above. Imagine the kind of slope that what give you that kind of response. While there is no hard and fast rule to indicate what a slope needs to be to be considered a brick wall filter, I think it's safe to assume that anything above 24dB is a pretty steep filter. The concept of a brickwall filter became well known with its use in non-oversampling CD players in the mid-80's. You needed steep filters to handle the frame noise generated by the Nyquist process in the DACs above 20kHz. These where analogue filters from around 24dB and were considered brickwall filters. Need proof? Study any old CDP schematics ;) [/QUOTE]
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Audio and Video Talk
General Discussion
Bass management -- "Large" vs "Small"
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