Eric Carroll;166578 Wrote: > I think the issue of balanced input sensitivity needs a wiki page. Perhaps a wiki that discusses all the issues surrounding use of balanced power amps is in order. As well as input sensitivity, there are potential grounding issues when using unbalanced and ungrounded sources (such as a Squeezebox).
Eric Carroll;166578 Wrote: > I have no idea why SD did not included a selectable attenuator on the > balanced side. Its 8 resistors needed for -10dB attenuation for a amp > with 1V input sensitivity. I guess they had to stop somewhere. My guess is that they didn't do it because attenuation would raise the output impedance. As a general rule, balanced outputs are sometimes used to drive long interconnects, and high output impedances should be avoided. Eric Carroll;166578 Wrote: > Clive, you did the posting on the DIY resistor network. Can that be > promoted to the wiki with the Rothwell references for the prebuilt > passive XLR attenuators? I'd be happy to add what I know to a wiki page, but before doing so I'd like others who have more extensive electronics knowledge (eg. Patrick Dixon, opaqueice, etc) to review it for possible gaffes. I'm pretty sure that the voltage divider I describe is safe to use with fairly short interconnects (say up to about 10 metres), but it does narrow the gap between source and load impedances, which might not be acceptable for long cable runs. -- cliveb Performers -> dozens of mixers and effects -> clipped/hypercompressed mastering -> you think a few extra ps of jitter matters? ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=31019 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
