Harvey Gerst
New member
A lot of analog equipment goes out well past 20k. My JBL 075 tweeters are pretty flat out to 30k, then drop off smoothly from there. I have an old Telex reel to reel that's flat to 37k, then rolls off from there.
But we're not talking about gradual rolloffs with digital - at 22.05 kHz, the signal goes thru a brickwall low pass filter that chops everything above that frequency drastically.
So the question remains; is there an audible tonal difference between a 7.5 kHz square wave and a sine wave? Is there an audible tonal difference between a 11.5 kHz triangular wave and a sine wave? Does digital turn them both into pure sine waves above those frequencies?
Is it audible? Is it important? Does that contribute to some of the differences we hear between digital and analog?
Is digital sound only accurate on CDs with sounds that are below 7,500 Hz, if those sounds contain odd harmonics? It's a lot lower frequency if the fifth harmonic is important; that's around 4,500 Hz with a square wave.
I don't have any answers, but I do have some nagging suspicions. Anybody?
But we're not talking about gradual rolloffs with digital - at 22.05 kHz, the signal goes thru a brickwall low pass filter that chops everything above that frequency drastically.
So the question remains; is there an audible tonal difference between a 7.5 kHz square wave and a sine wave? Is there an audible tonal difference between a 11.5 kHz triangular wave and a sine wave? Does digital turn them both into pure sine waves above those frequencies?
Is it audible? Is it important? Does that contribute to some of the differences we hear between digital and analog?
Is digital sound only accurate on CDs with sounds that are below 7,500 Hz, if those sounds contain odd harmonics? It's a lot lower frequency if the fifth harmonic is important; that's around 4,500 Hz with a square wave.
I don't have any answers, but I do have some nagging suspicions. Anybody?