Channel separation - stereo and dual mono (AU-317 vs. AU-517)

[Karl vd Berg]

Good afternoon/evening,

Just wondering why models like the AU-517 and AU-717 have same channel separation number (65dB line) of the AU-317.

AU-517 and AU-717 models have separated power supplies (dual mono), whereas the AU-317 has single PS that feeds both channels.

Channel separation of the AU-719 is 70dB (line), and the AU-919 reaches 80dB...

Probably anything above 60dB is already good, but...

 

[Hyperion]

Actually AU-317 Aux input channel separation at rated power output is 73dB, the AU-517/717 achieve 65dB for this, not the result I would have expected.

 

[Karl vd Berg]

You are right, John! I saw now the 317's brochure... 73dB of channel separation for this unit is unbelievable.

 

[Robisme]

I have had all three and the AU-317 holds it's own. My daughter still has it.

Rob

 

[kevzep]

I worked on a couple of AU317's recently, and yes, they are actually surprisingly good!!

 

[rasenthiran]

Hi Guys,

When you say channel separation,Does it mean's the stereo separation between the two speakers? How about the old amplifier's such as Sansui AU 999 which is 50db,Does it makes a lot of difference compare to 70db for example?

Thanks

Raj

 

[Hyperion]

Sansui AU 999 which is 50db,Does it makes a lot of difference compare to 70db for example?

Yes, a big difference.

Channel separation means the degree of isolation of one channel from the other in audio output terms.

Things that can influence this are direct signal crosstalk at any point in the signal chain from the RCA sockets to the speaker terminals and beyond. But also importantly from PSU modulation by one channel, unavoidably (in the case of a shared PSU), impressing itself on the output of the other channel. This is why the result from the AU-317 is surprising as it has a shared PSU, but the AU-517 and AU-717 are specifically designed not to have a shared PSU.