azaz44;573819 Wrote: > I'm no master in electronics... > > And I know the impedance could make a problem with sound, but I cannot > imagine how the EC can complain or measure anything, if there's no > signal coming. This means it's just 0V between signal and ground on > both inputs, thus no current. > > As for the numbers, it seems the SB3 output impedance is 220 Ohms, > which I found here: > > http://www.audiocircle.com/index.php?topic=23435.0 > > by comparison, my CD player (NAD C541i) has 200 Ohms, EC pre (which I > don't own) has 100 Ohms. > > But as it comes to CD, I just found I actually didn't connect it > directly, I always used a pre. The CD doesn't have any volume control. > So I don't know, if this 200 Ohms are OK. > > > Can the passive preamp (no power connected) make the impedance lower? > as I imagine, it cannot, can keep the same when the volume is set to > maximum, or make it even worse in other cases. But I'm no master in > electronics as I wrote... > > I just checked the output impedance of the active pre which works fine. > This is Rotel RA-02, which is a budget integra actually, but can be used > as pre-amp as well. The output voltage/impedance of the pre outs is: > 1V/470 Ohms. So actually over two times worse than SB3 - and still > works with EC. > > > It seems I will have time to test shorting plugs soonest tomorrow. If > it doesn't work, it's maybe a good idea to contact Electrocompaniet, > maybe they know the answer, or at least what the amp is checking for. > > As for safety, I know about the problem.
It's very simple for the EC to measure what - if anything - is connected to its input. The Rotel works and its impedance is 470 ohms which is low. Can you try the CD player directly into the EC? - that would prove or disprove my theory. I think the EC needs a low-ish impedance across its inputs to un-mute. -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... Touch(wired/XP) - TACT 2.2X (Linear PSU) + Good Vibrations S/W - MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Pekin Tuner, Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Kitchen Boom, Outdoors: SB Radio, Harmony One remote for everything. ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=81664 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
