Rodney, I hope that in my system I will not feel that 'veil' effect, whether that due to my system, room, or just my ears.. 255$US is not a big sum anyway.. will see..
RE: connectors, I found that quote: http://www.lampizator.eu/lampizator/TRANSPORT/CD_transport_DIY.html > > The transformers are always present in all CD players output. If we > want to convert the connection to XLR balanced, the transmitting side > needs a transformer with secondary winding completely isolated and > connected to XLR pins, and if the DAC has no transformer, we can buy an > old CD player on ebay for 20 Euro (defect one) and get the transformer > from it. It is a metal square can. > > The resistors of 75 or 110 Ohms are not strictly necessary - they are > just for approximation of the cable LINE IMPEDANCE (WAVE IMPEDANCE or > CHARACTERISTIC IMPEDANCE) . The signal as fast as this is travelling in > the cable with the speed close to light, and the cable has a > characteristic impedance per meter, and if the receiving point has > different impedance - the signal may BOUNCE BACK and travel back and > forth as a reflection. It really behaves like a wave. When wave hits > the shore - it bounces back. > This causes the receiver to go crazy because it sees more than one > signal. It reads the echo of the original. > So a good practice is to use the resistor the same value as the cable > characteristic impedance on both transmitter and receiver ends. > Having said that, the RCA connector IS ABSOLUTELY NOT a 75 Ohm > impedance connector., So no matter what cable, no matter what > transmitter and what receiver - the RCA will cause signal reflections. > > The only good solution is BNC connector (50 Ohms) or XLR (110 Ohms) > Let's not forget that the resistor at the input is in parallel with the > small transformer. So in fact we see at each end not true 75 (110) ohms > but this impedance in parallel with the transformer winding impedance > plus the parallel impedance on the other side of transformer. So it is > very very hard to make a line with the same impedance as the > transmitter and receiver point. > Remember, it is NOT IMPORTANT which impedance is at the transmitter or > receiver. We don't need to produce exactly 75 or 110 Ohms. > What matters is that the IMPEDANCE OF RECEIVER, of TRANSMITTER and of > CABLE WITH PLUGS is the same. It can be 200, 143 or 59 Ohms. As long as > it is the same and it does not induce reflections and bouncing. > So in the end - it does not matter what is between the source of the > signal and its receiver, as long as at the end we get the clean, sharp > digital square wave without reflections. > -- michael123 ------------------------------------------------------------------------ michael123's Profile: http://forums.slimdevices.com/member.php?userid=23745 View this thread: http://forums.slimdevices.com/showthread.php?t=77397 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
