seanadams;368286 Wrote: > Impedance is almost never at issue in this case. Maybe I can clear up > some of the confusion: > > ** Line-level interconnection (ie analog RCA or XLR cables): You should > have a low impedance output (eg 100Ω) driving a high impedance > input (eg 10,000Ω).* The exact numbers do not matter, you just > need the receiving end to be much larger (>10x) the transmitting end. > You are NOT trying to accomplish "impedance matching" here, nor are you > trying to achieve "maximal power transfer". Instead, the goal is to have > a stiff/strong source driving a weak/loose input. The goal is to > transfer information (low frequency voltage), not power. (Notice that I > have not mentioned anything about signal levels, more on that later). > > ... > > So what happens in each case if you get it wrong? > > Line levels: if the receiving device has a low input impedance (in > which case it is probably defective) or if the transmitting device has > a high impedance, what happens is that the signal becomes attenuated - > like a weak person arm-wrestling a strong person, the change in arm > position (voltage) is reduced for a given amount of exerted force on > the part of the weak person. This mainly just results in a reduction in > volume, but may also increase distortion depending on the > characteristics of the transmitter. Using passive attenuators increases > the effective impedance of a source, but in most cases should not cause > problems. > > ... > > Back to the original subject of this thread... taking the above into > account, can anyone suggest a practical scenario that would benefit > from this product? I can't. If a line level source device is too weak > to accurately drive a >10K input, then it is quite simply defective. Thanks for this clear explanation ! I feel a lot less confused, now.
If I understand properly, if the "Audio Buffer" is perfectly linear (zero distortion, 0-100kHz +-0dB) then one can only benefit (possibly) of a slight level gain. In all other cases (i.e. in real-world scenarios) it should add a small distortion and frequency deviation that *one might notice*. So, if one expects a rather "neutral" character from his amplifier section(s), then one should never use this kind of product. And if one expects a "non-neutral" (colored) character from his amplifier section, then one should rather use a tube (pre)amp section, for instance. In both cases, this device doesn't look like a solution to anything. Right ? -- Themis SB3 - North Star dac 192 - Denon 3808 - Sonus Faber Grand Piano Domus ------------------------------------------------------------------------ Themis's Profile: http://forums.slimdevices.com/member.php?userid=14700 View this thread: http://forums.slimdevices.com/showthread.php?t=56068 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
