sadie777 Posted January 6, 2015 Share Posted January 6, 2015 I picked up this cd at the local Goodwill yesterday, The Very Best of Erich Kunzel and the Cincinnati Pops On the back is has a warning: Caution: Digital Sound Effects of high levels with infrasonic frequencies to 5 Hz. Please establish safe playback levels before playing. Excessive playback levels could result in damage to equipment. Has anyone seen this warning on a cd before? This is the first time I've bought a cd of this type before, so I don't know if this warning is normal or not. 2 Quote Link to comment Share on other sites More sharing options...
JerolW Posted January 6, 2015 Share Posted January 6, 2015 My Erich Kunzel/Cincinnati Symphony Orchestra CD is the "1812" Overture. It has a warning, "CAUTION! DIGITAL CANNONS" jerol 2 Quote Link to comment Share on other sites More sharing options...
Ceptorman Posted January 6, 2015 Share Posted January 6, 2015 That warning only applies to Bose equipment 3 Quote Link to comment Share on other sites More sharing options...
Sancho Panza Posted January 6, 2015 Share Posted January 6, 2015 YES, I have this one & several others from TELARC with this same Warning. My Erich Kunzel/Cincinnati Symphony Orchestra CD is the "1812" Overture. It has a warning, "CAUTION! DIGITAL CANNONS" jerol Quote Link to comment Share on other sites More sharing options...
Sancho Panza Posted January 6, 2015 Share Posted January 6, 2015 P.S. They are considered very good recordings... 1 Quote Link to comment Share on other sites More sharing options...
fuzzydog Posted January 6, 2015 Share Posted January 6, 2015 I cant imagine how big of a subwoofer you would need to actually play at 5 Hz. 1 Quote Link to comment Share on other sites More sharing options...
Sancho Panza Posted January 6, 2015 Share Posted January 6, 2015 (edited) Some of the Bach TELARC CDs played on famous church cathedral organs are nice. Edited January 6, 2015 by Sancho Panza Quote Link to comment Share on other sites More sharing options...
mattSER Posted January 6, 2015 Share Posted January 6, 2015 I cant imagine how big of a subwoofer you would need to actually play at 5 Hz. You'd probably need a rotary. http://www.rotarywoofer.com 1 Quote Link to comment Share on other sites More sharing options...
Sancho Panza Posted January 6, 2015 Share Posted January 6, 2015 ^^^ OK, but, for $26K Each, I'll only take "2". 2 Quote Link to comment Share on other sites More sharing options...
Schu Posted January 6, 2015 Share Posted January 6, 2015 Marketing? 1 Quote Link to comment Share on other sites More sharing options...
Chris A Posted January 6, 2015 Share Posted January 6, 2015 Has anyone seen this warning on a cd before? This is the first time I've bought a cd of this type before, so I don't know if this warning is normal or not. Product liability marking and marketing hype. Many loudspeakers and subwoofers on the market, particularly those with direct radiating drivers, cannot handle concert-volume playback of low frequencies (where loudspeakers are always the least efficient) even in a small listening room. 2 Quote Link to comment Share on other sites More sharing options...
Schu Posted January 6, 2015 Share Posted January 6, 2015 Warning... this thing is dangerous. Hmmm... "I want to check that out!" 2 Quote Link to comment Share on other sites More sharing options...
sadie777 Posted January 6, 2015 Author Share Posted January 6, 2015 Thanks everyone. I haven't had the chance to listen to it yet, hopefully have some time tonight. 1 Quote Link to comment Share on other sites More sharing options...
garyrc Posted January 6, 2015 Share Posted January 6, 2015 When you have a bass reflex woofer, they absolutely can respond to subsonics. When they "unload" from the port they can be pushed to maximum travel pretty easily by a 5Hz tone with some power behind it. QUOTE Another trade-off for this augmentation is that, at frequencies below 'tuning', the port unloads the cone and allows it to move much as if the speaker were not in an enclosure at all. This means the speaker can be driven past safe mechanical limits at frequencies below the tuning frequency with much less power than in an equivalently sized sealed enclosure. For this reason, high-powered systems using a bass reflex design are often protected by a filter that removes signals below a certain frequency. Unfortunately, electrical filtering adds further frequency-dependent group delay. Even if such filtering can be adjusted not to remove musical content, it may interfere with sonic information connected with the size and ambiance of the recording venue, information which often exists in the low bass spectrum. END QUOTE - source-http://en.wikipedia.org/wiki/Bass_reflex How about horns? Do speakers with horn loaded bass (Like Khorns, La Scala, Belle) "unload?" What happens to a 5 Hz tone with these? Is it just inaudible, but safe, or does it move past safe mechanical limits? Quote Link to comment Share on other sites More sharing options...
mustang guy Posted January 6, 2015 Share Posted January 6, 2015 I think limits are limits for excursion horn or otherwise. The horn would create some mechanical resistance just like a sealed enclosure as compared to a ported one. I have bottomed my THT's out before. Thud thud thud... It's a wonder I didn't have to buy new drivers. 1 Quote Link to comment Share on other sites More sharing options...
rebuy Posted January 11, 2015 Share Posted January 11, 2015 I had this same warning on my P.D.Q. Bach CD. "The 1712 Overture and Other Musical Assaults". 1 Quote Link to comment Share on other sites More sharing options...
Mallette Posted January 11, 2015 Share Posted January 11, 2015 I had this same warning on my P.D.Q. Bach CD. "The 1712 Overture and Other Musical Assaults". The warning on PDQ Bach is more important about its potential effect on your brain... Dave Quote Link to comment Share on other sites More sharing options...
boom3 Posted January 11, 2015 Share Posted January 11, 2015 Yes, horns unload but the Klipsch products have a sealed back volume that controls the cone motion below the horn's cut-off, limiting cone motion. Many years ago Paul told me that a high-pass filter for the Klipschorn at 28 Hz would be correct. He didn't mention slope but my feeling is that 18 dB/octave would be right. My Cornwalls crossover to a subwoofer at 60 Hz and so don't see anything close to infrasonic. 2 Quote Link to comment Share on other sites More sharing options...
mattSER Posted January 11, 2015 Share Posted January 11, 2015 My RF-7s audibly cut off cleanly at around 30hz, but if I sent them a 5hz signal, the woofers would be flapping all over the place. Quote Link to comment Share on other sites More sharing options...
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