This sort of gear is rarely sold to the public as the public don't like stuff that even MIGHT explode. I risk failure when amplifiers will go to to a 90VDC + or - full rail condition with no hesitation.and just sit there until the woofers or amplifiers explode- or both!īut that is the price that one pays for getting to some of the more 'ultimate' sonic fidelity. Like a shotgun with a hair trigger and the trigger guard cut off. I've many times run with pure DC gear with no safeties of any kind-whatsoever. So you might imagine, then, that my 'opinion' is that no roll off of any kind is what is the more desirable (with all things being equal, which they never are) situation. This comes from playing with the guts of gear on a daily basis. My experience is that bass roll-off on pre-signal (line level)level inputs or outputs is directly equatable with the ultimate crushing of dynamics and harmonic structure. Perhaps, home systems should have this filter since there is so much material out there already.Īnother example of when bad is good, too much bandwidth passes out of band noise signals and therefore less bandwidth is often a good thing. The point of this thread was to confirm that others are seeing this also and to perhaps suggest that a 5 to 10 Hz filter should be used in the final CD mastering. I have to dig into this more when I have the time. The Stevie Wonder CD has it in at least one place where I've seen it in other systems. It could be something with my rig, but I've seen it with certain CD's on other systems. Looked at the schematics and the main amp and feedback are DC coupled, it only has a huge (2 - 220uF back to back) input cap. It will obviously pass just about anything at the input. The particular system that I'm looking at now has a Harman Kardon (by Heathkit) power amp with a -3dB point of. On the other hand it was repeating at the Joseph/Manley room, HE 2004. ![]() What was odd about this recent issue is that it is happening so often, I've seen strong woofer flapping occasionaly on various recordings. Did not seem to cause any audible issues, but they were not pushing the system. I noticed this problem at the Joseph/Manley room, HE 2004 - don't remember the cut. Who'd have thought one would be needed with CDs? ![]() Seems a good 10 Hz subsonic filter would help with this waste of power and excursion. ![]() I'll have to dig into it more when I have the time, but I'm fairly certain that it is on the CD.Īnyone else notice it on this particular CD or any others? Then every bass note that comes along, kicks the system and makes it ring at that very low frequency. This means that it is close to being an oscillator at that frequency but without enough gain to sustain oscillation. My guess is that something in the recording chain had a regenerative ear below the audio band. This CD has a lot of real bass, but it also has this subsonic ringing throughout the CD. One clear example is Stevie Wonder "A Time to Love". I've noticed several CDs that cause large subsonic woofer excursions.
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