Home |
Search |
Today's Posts |
|
#1
Posted to rec.audio.pro
|
|||
|
|||
Where does the hum come from?
On 12/02/2021 10:15 am, geoff wrote:
On 12/02/2021 2:02 am, Scott Dorsey wrote: geoffÂ* wrote: Look at the picture in the OP link. RCA unbal outputs. I have no graphics here.Â* So RCA on one end, what is on the other end? No graphics ?Â* This *is* the 21st Century ! Or are you working on one of these ?Â* ;- ) https://www.facebook.com/photo/?fbid...57424488371333 (for the insecure the link is to a picture on Facebook of a computer). If the RCA connector is run to pins 2 and 3 of an XLR on the other end with pin 1 lifted (as is a common and reasonable configuration), then the case of the powered speaker won't be connected to the case of the DAC until power is applied.Â* So in that case the thing would hum in the configuration the original poster describes. But without knowing what the cable is, you don't know for sure. --scott Well can be sure it isn't a twin untwisted heavy-gauge speaker cable ! The LSR305 has bal (and equally unbal) jack and XLR inputs. At least mine have, and no hum even when connected via several intermediate devices to a PC, a mixture of bal and unbal. Would help to know the 'quality' and make-up/configuration of the RCA-to-whatever cable. geoff 'Slight' correction, mine are LSR705P. geoff |