TS> I didn't choose to get into the complex  
 TS> transmission line theory as to why 110 ohm output  
 TS> impedances are about optimum for most solid state audio  
 AA>   
 AA> That I'm quite aware of, just apply some of the RF 
 AA> theroy back to audio.  
Care to wager what percentage of those who drop in here have any clue about 
that?    
 AA> Also, there is a diference betwene dbv and dbV one of those is the new 
 AA> nomeclature (in some circles) that refers to .775V 0db.  Since dbv did 
 AA> reference to 1 Volt I guess it's the dbV that references the .775V. 
dBV has been a "fake" consumer 1 Volt, arbitrary impedance reference for 
years, while 0 dBm has unpredictably been misused to mean 0.775 V into 
various impedances on a nominal 600 ohm, 1 ohm to 100 k actual, line, almost 
more often than it's been used to mean 0 dBm (i mW on a 600 ohm actual line). 
 Even in telephony it's really been misused, as nominal 600 ohm phone loops 
can have real impedances that bounce through a range of about 100 to several 
k.  
dBu, unreferenced, I still say is the term you're trying to recall, which is 
sort of an official "revisionist" definition of dB to not mean a power ratio. 
 
Terry
 
--- Maximus 2.01wb
---------------