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Level needed to drive the speaker to full blast..

Posted by Sumflow on July 10, 2012 at 18:52:12:
Thank you Ivan, that is for sure the clearest explanation and the only one that makes sense to me so far. What I was trying to do was set the sensitivity level input control knob on the studio monitors, to match the output from a McIntosh MA-6100 pre-amp.

My Mac’s guy Terry DeWick in Tennessee tells me the output load impedance from my preamp if I ever get it back, is +10 to +30. I think he said 1,000 om's. Below is what I got back from Yamaha Support:

Yamaha Support
Subject: Re: HS50 volume control [ref:_00D30F1z._50030NGbk9:ref ]

HI Sum: the volume control is setup for compatibility with the nominal output level of mixers etc. If your mixer is nominal at +4 set the control to that position and when the mixer sends a +4 signal then the speaker will be its full output. This is too sensitive for some setups where you don’t want to monitor really loud. I like to set the mixer at its nominal level where it is outputting +4 and then set the input volume on the speakers for as max loud as they will need to be in use. If you have access to a RTA you can set this for a specified level such as 85/95 DB. Hope this helps EB

HI Sum: So you mean flat EQ wise? Set the switches on the back to ")" and flat on the lo cut that is flat on these speakers. Volume doesn’t relate to "flat” it just sets the speakers input sensitivity. You just need to know where the output on the Mac pre is nominal at and set the volume for that position A Mac tube C22 pre has a 1.0 v l+r output which is "0" db so set the volume control to appx 2 o’clock on the speaker and you should be close.

HI This is a sensitivity control. Full open is most sensitive for a -10db output from the preamp. 12 o’clock is compatible with a +4 db output. 7 o’clock is compatible with a super hot hotput from the preamp of about +14

A thousand om's will keep me up all night :)