Aja on 8/12/2009 at 20:13
I have a lo-cut switch and I don't really find it necessary unless listening at unneighbourly volumes. That base hum of the turntable disappears under all but the quietest music (in which case the surface noise of the needle usually still drowns it out).
Martin Karne on 8/12/2009 at 20:16
And omg tubes amplifiers!!! OMG the rage is going on!
Yeah tubes do compress audio so it sounds better to most people for that reason.
(
http://img340.imageshack.us/i/tubesoftcompression.gif/)
Inline Image:
http://img340.imageshack.us/img340/9149/tubesoftcompression.th.gifBesides that brutal digital dynamics that many dislike, every bit you add means +6dB for every single little step going higher or lower.
A +3dB is twice the previous level or half depending if you're increasing or decreasing that sound waveform, do the maths every sound level change on a CD is higher than that.
And good bass level and high levels are way louder on a CD that it was ever possible on vynil or another analog media.
Martin Karne on 8/12/2009 at 20:19
Quote Posted by Aja
I have a lo-cut switch and I don't really find it necessary unless listening at unneighbourly volumes. That base hum of the turntable disappears under all but the quietest music (in which case the surface noise of the needle usually still drowns it out).
Let me remind you, from a Technics manual for Monitor 1 loudspeaker 150W RMS, a max of 5W RMS of pure tones is the maximum allowable for that speaker, submitting a loudspeaker to continuous low frequencies it will damage the voice coil sooner or later.
Aja on 8/12/2009 at 20:27
The manual that came with the preamp claims the lo-cut switch is for older turntables that might exhibit low frequency noise. Mine is only a few years old. Besides, I even have a subwoofer hooked up, and if I turn it up all the way I don't hear anything more than a slight hum. Or are you saying these supposed frequencies even lower than what the sub can reproduce?
Martin Karne on 8/12/2009 at 20:34
Sound cannot be reproduced anything that low on vynil because there is no sound that is recorded on the vynil that will go anything lower than 50-60Hz, the rest is just mechanic rumble.
Analog media cannot reproduce low and high frequencies at a very high level, or the grooves would be so large that it would swing back and forth sideways too much even using RIAA equalization.
MorbusG on 8/12/2009 at 20:43
Quote Posted by Martin Karne
Nope I meant the rumble coming off the platter that has nothing to do with sound at all, just useless subsonic noise.
No tape master could get any lower than 30-25-20Hz with luck, so a vynil disc is not having anything on a high level worth reproducing at or below 20Hz if there is any.
In my schoolbook, the normal human hearing range is written as 15 Hz - 15 kHz, but I'm not sure if you are referring to what can get captured into the vinyl. Probably are, and you know a lot more of this stuff.
Anyway, just wanted to add about the digitalization that theoretically you always lose some information when digitizing analogue signal.
Martin Karne on 8/12/2009 at 20:50
Of course, what I mean is what is the point on capturing useless sounds that are not even on a level that can be heard.
Up to 90KHz can be captured on a digital media DVD Audio, and well some people claim only noise comes out of SACD on higher frequencies enough to be measured as such on spectral analysis.
Even if people claim to hear sounds down to 8Hz is more likely to be a superior harmonic than anything else, as well at the other end of the spectrum, anything higher than 25KHz most likely is heard as inferior harmonics.
Turtle on 8/12/2009 at 23:09
How can you suddenly speak English?
Martin Karne on 9/12/2009 at 01:24
Must be that hit in my head, oh those piano lessons, gone!
;)
