Thanks got it! My listening distance is at around 3,0-3,5 meters. So this means 89-91 dB. Is my assumption correct that the internal amps in Genelec will have to work hard if it is set at low sensitivity of -6dBu/0.39 volts RMS? So even a bad AVR should output 1.55 V RMS when I have the AVR volume knob at around -30dB. So it ok to leave the knob at +6dBu? In case of XLR out put from processor like Yamaha CX-A5200 or unbalanced RCA output from Denon 3700 in preamp mode, the output will be 4V. So even here I can keep the setting to +6dBu - correct?
sorry for a naive question - since Genelec has this sensitivity setting, does the AVR measurements like higher output and higher SINAD per volt has relevance for active monitors like Genelec? Will a lower SINAD - 52DB from 2V rms of the worst measured AVR like NAD T758 have a massive influence on sound quality from Genelec. In other words, if I keep the volume high in AVR e.g. 0DB, then the volt will be high and I assume SINAD will also rise. Is my understanding correct as Genelec says for digital signal source - keep the volume of incoming digital max and reduce the volume of Genelec in GLM like mentioned below? Can I apply this for analog signal and reduce the influence of badly measured AVR on the sound quality from Genelec?
View attachment 178900
Since you are using GLM for setup and room EQ you should set "Stored" DIP switch to
on, and that disables the the other switches including the rotary knob for sensitivity. Remember to save changes made in GLM with the "Store to Loudspeakers" or you will loose the settings at first power on/off.
The volume level in GLM is the same as input adjustment with more range, thus replacing the sensitive rotary knob. Volume level 0 corresponds to 100 dB (at 1 meter distance) with -6 dBu signal.
Have a look at the post 2564 made by
@Ilkka Rissanen that is a Genelec employee:
community.genelec.com
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OK, that means its like try and error, so there is no "mathematical" way by knowing the numbers of the setting?
You can do some calculations but there is no single 'right' value, it all depends how you want to scale you system's gain structure.
Default (maximum) input sensitivity of the 8351A is 100 dB (at 1 meter distance) with -6 dBu signal. Maximum output of the monitor is 111 dB which means that you need -6 dBu + 11 dB = 5 dBu input signal to reach it. Maximum output of your Yamaha is rated at 8.5 V which translates to 21 dBu. That is 21 dBu - 5 dBu = 16 dB more than is required for the maximum output which means you can lower the input sensitivity of the monitor by at least this amount, probably even more because I doubt you will constantly push your monitors to maximum SPL (if you do, you will most likely need bigger monitors). So, -10 to -20 dB setting for input sensitivity would be my starting point for testing. Of course it also depends how much of the maximum volume range of Yamaha you want to use. Some people want to use only half of it, some prefer more.
Of course I have, that why I made the decision for Genelec
But I don't use the GLM for adjusting the volume, its always fixed on 0 dB for analog source (I do not use the digital input).
Did I miss the point or what has GLM to do with the input sensitivity question?
Oh good! Yes, you have missed a very important point.
GLM volume setting is the same as input sensitivity adjustment, it just has more range, from 0 to 120 dB. Also, when you are using GLM, all manual settings behind the monitor are overridden. The only dip you need to enable is the stored settings switch which enables the monitor to remember the GLM settings stored in it. In order to set the input sensitivity via GLM, go to Group | Store current group settings at current volume level to SAM monitors, and have the volume slider for example at -20 dB then. Obviously you don't need to have music playing then.
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A handy online calculator for these calculations is
dB dBu dBFS digital audio conversion dBV from dBu to volt, dBV to volt, volt to dBu and dBV dB decibels calculation SPL 0 dBFS normal decibels relationship relation explanation analog audio absolute level true rms convertor converter decibel to dbfs converter attenuation ratio reference convert...
www.sengpielaudio.com