Amplifier knobs...where to "set" on the clock?


Here is a question that has idled in my head for years...

I have a 1983 M-70 Yamaha separate amplifier...paired with a C-70 pre. On the front of the M-70 are two sets of knobs for output...for the A and B speakers. I have never been sure on where to place the output line...as if on a clock.  A  "tech" friend told me that the knobs should be at straight-up "noon"...(not wide-open at 5:00)  He saying the reason: "Let the preamp do all of the work". Then, I asked the tech who serviced the M-70 and C-70 years later and he told me the knobs should be "wide open" at 5:00. no reason, except that is where they should be set.

Hmmm.

What do the fine people here at Audiogon say to those two opposing opinions?

What a hobby!

Thank you in advance.

vinylspin
vinylspin
 Speaker Level Controls:
In addition to speaker A/B selectors that permit one-touch selection of two sets of stereo speakers, the M-70 features independent level controls for the left and right speakers in two stereo pairs. That is, you have independent left and right speaker level controls for speaker pair "A", and left and right level controls for speaker pair "B". These controls let you independently set the maximum power level that will be sent to the respective pair of speakers, protecting low-power-capacity speakers from excessive power levels, or matching the output level of two sets of speakers of different efficiency. Independent control over left and right speaker level lets you preset the balance of your system for optimum stereo imaging depending on the positioning of your speakers and the acoustics of your listening room.
Speakermaster...thank you...

With your advice...  To me...that would suggest that perhaps since I have a VERY efficient set of Cerwin Vega speakers...101db...Perhaps I should consider backing the gain off a tad...maybe from Full-On 5:00 to 3:00?  allowing the preamp to "breathe" a bit? Am I making sense?

Also...hobo1452...thank you
With your advice...to me...it suggests one of the reasons for the gain control at all is about a high wattage amplifier not over powering and "cooking" a vulnerable set of speakers... i can customize the output safefly and correctly...while still allowing the preamp to do its job.  Am I making sense?
vinylspin
As with many things, try the options and see. Noon? 5 o'clock? I bet your system works better at one of them.