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In Reply to: RE: output matching posted by walkstoslow on April 01, 2017 at 06:06:31
You might check the output spec/input specs:
Typically the Output spec lists a Maximum voltage out- so a full tilt signal would cause that 2 volt signal - the cannons going off in the 1812 Overture- Other passages would vary correspondingly....
Input spec - typically it is listed as "minimum input required for full output". Having said this - 150 mV is more like the output from an MC cart - not a Line Level source. It is common for a Pre-amp/receiver to take inputs in the range of 1.5-2 volts for full output [1.5V = 1,500 mV] - most line level sources (Tuners, Tape decks & CD players) have an output in the 1.5-2.0 Volt range.
Lastly- Unless there is a limiter in the input circuit of the receiver (unlikely) you can feed the CD into the Aux input - and you may just not use most of the Volume Pot range...
Let me state this back to you to make sure I understand,the output of the cd player is proportional to the signal from the disc, with a 2v max for the cannon, being the signal with the most amplitude.
I checked again the input specs of my receiver(sansui 317)and the service manual reads aux, tape play 150mv/47kilo ohms, so this is the minimum signal to get full response.
I listening to a pair of utah coaxes in a ported box.
3 ticks up on my volume control (8:00) is too loud. I was thinking my input is too high, apparently this is not correct.
Do I just need less efficent speakers?
Back in the day of your Sanusi, most cd players came with a variable out. Now the cd players or dvd blu ray just have a direct out of 2 volts. Conversely today's amps today have around 300 mv input sensitivity. So you have more steps on your volume control. It doesn't help your specific case, except for an explanation.
"I know just enough to get into trouble. But not enough to get out of it."
Well, yes, less efficient speakers might help-
you have created the perfect storm- in that you are using very efficient speakers, so you do not need much gain to drive them to pleasant levels-
and yes, the Sansui has a very low input sensitivity -
You have a couple of choices-
You can live with letting the amp loaf along and enjoy unparalleled headroom (because you are not taxing the amp)
Or you can add some resistors to reduce the output of the CDP and go to town-
I would leave it, and not crank up the Volume pot-
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