Msiebers,
I believe that article was more valid at the time it was presented than it is today, due to changes in the analog playback environment.
Only a few turntables that existed in 1977 could match today's better decks for lack of rumble, wow, flutter, etc. Those noise sources were common in many 1970's and older decks (including all of mine!) so isolation from them was critical.
Those noise sources barely exist on today's decent rigs. The problems have changed, for the better of course, so the solutions should change to match them.
Today the most significant vibration sources are footfalls and warps, which mostly fall well below 8Hz, and LF bass information recorded on the record, which can go as low as 16Hz or so on some records. A resonance frequency as high as 18Hz would have a high probability of interacting with music information.
Good job pointing up that article. Reflecting on it shows how much progress analog playback has made in recent decades.
P.S. regarding Raul's concern
The B&W spec for the N803's is -3db @ 35Hz and -6db @ 28Hz. My loose recollection that they go flat to 33 was an overstatement by approximately 4db. Sorry for the inaccuracy.
Obviously they do produce useful, audible information into the bottom half-octave, which is consistent with the audibility of LF bass interference. No doubt speakers which go lower would reveal even more, as you originally stated.
I believe that article was more valid at the time it was presented than it is today, due to changes in the analog playback environment.
Only a few turntables that existed in 1977 could match today's better decks for lack of rumble, wow, flutter, etc. Those noise sources were common in many 1970's and older decks (including all of mine!) so isolation from them was critical.
Those noise sources barely exist on today's decent rigs. The problems have changed, for the better of course, so the solutions should change to match them.
Today the most significant vibration sources are footfalls and warps, which mostly fall well below 8Hz, and LF bass information recorded on the record, which can go as low as 16Hz or so on some records. A resonance frequency as high as 18Hz would have a high probability of interacting with music information.
Good job pointing up that article. Reflecting on it shows how much progress analog playback has made in recent decades.
P.S. regarding Raul's concern
The B&W spec for the N803's is -3db @ 35Hz and -6db @ 28Hz. My loose recollection that they go flat to 33 was an overstatement by approximately 4db. Sorry for the inaccuracy.
Obviously they do produce useful, audible information into the bottom half-octave, which is consistent with the audibility of LF bass interference. No doubt speakers which go lower would reveal even more, as you originally stated.