QUOTE(sky_lor @ Aug 12 2005, 03:03 PM)
oh ya...one more thing to ask...the HA11 got preout right...i connect it to my R1900T3 and my headphone to the headphone jack infront. so both headphone and speaker got sound at the same time. i wanna ask is it any other way to allow me swtich between the headphone and speaker?i just wondering...edifier design the amp with such hardware function...but no manual or anything to teach me...anyone can help?plz...
get a switch box for proper input/output switching(not dual action).
pre-amp out bypasses the amp circuit, usually, headphone amp can be used as active pre-amp as well....but..NEVER use it to power a pair of passive speakers.
regarding your hiss, seems like it's your house's power outlet problem. AVR has noise reduction built into it, but I never find it useful. Alternatively, build yourself a battery pack to power the amp, if the amp is not a Class A amp, it should last you quite long with the battery pack...if it is a Class A amp....then it doesnt seem very practical since it will usually drain all your batteries within a few hours.
you can also try to get a linear regulated psu to power it. brick psu usually suck though, that gives you an idea why some PSU would cost a few hundred to thousand bucks.