I've noticed several CDs that cause large subsonic woofer excursions. One clear example is Stevie Wonder "A Time to Love". This CD has a lot of real bass, but it also has this subsonic ringing throughout the CD.
Looks by eye to be close to 1 Hz. My guess is that something in the recording chain had a regenerative ear below the audio band. This means that it is close to being an oscillator at that frequency but without enough gain to sustain oscillation. Then every bass note that comes along, kicks the system and makes it ring at that very low frequency.
I'll have to dig into it more when I have the time, but I'm fairly certain that it is on the CD.
Anyone else notice it on this particular CD or any others?
Seems a good 10 Hz subsonic filter would help with this waste of power and excursion. Who'd have thought one would be needed with CDs?
I noticed this problem at the Joseph/Manley room, HE 2004 - don't remember the cut. Did not seem to cause any audible issues, but they were not pushing the system.
I've noticed several CDs that cause large subsonic woofer excursions. One clear example is Stevie Wonder "A Time to Love". This CD has a lot of real bass, but it also has this subsonic ringing throughout the CD.
Looks by eye to be close to 1 Hz. My guess is that something in the recording chain had a regenerative ear below the audio band. This means that it is close to being an oscillator at that frequency but without enough gain to sustain oscillation. Then every bass note that comes along, kicks the system and makes it ring at that very low frequency.
I'll have to dig into it more when I have the time, but I'm fairly certain that it is on the CD.
Anyone else notice it on this particular CD or any others?
Seems a good 10 Hz subsonic filter would help with this waste of power and excursion. Who'd have thought one would be needed with CDs?
I noticed this problem at the Joseph/Manley room, HE 2004 - don't remember the cut. Did not seem to cause any audible issues, but they were not pushing the system.