Hey dear members of Rotel club, I just joined the club with the addition of a RMB1075 to my system. I was using the Denon AVR2805 before as my receiver and now using its Preouts and as a Preamp. I've noticed that, I have to turn the volume on the 2805 to around -20 to -10 dB range to get good volumes now, whereas I could stay around -30dB before when I didn't have the 1075 and was satisfied with the output from the speakers. Is this normal? When using the 2805's preouts, does it automatically changes the reference level to a different level?
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All amps will have different gain. The 'number' on your dial really doesn't mean anything. Re-callibrate with your SPL meter and enjoy. -
It is interesting that many amps (like denon) have a volume dial that goes from -70 to +20, but Rotel from 0 to 100. It's the dB scale, and I believe the idea of "Reference volume" actually just means, the preamp is outputting the same voltage as the input (ie. gain = 0).
But the amps are not all equivalently sensitive, ranging from 0-1V to 0-4V or even more. (RMB1075 is 0-1V, RMB1095 is 0-1.5V, RB1090 is 0-1.8V) Rotel does this to help match different amps in a multi-channel setup, even if it is not perfect (hence only the same amps should be used).
In addition, 1V to 1 amp will not have the same output as 1V to another amp, depending on sensitivity and power capability... and 1W to 1 speaker will not sound as loud as 1W to another more efficient speaker...
So, the idea of a reference level is crazy, imho. It may be nice to know that the preamp is outputting the same level as the input (ie. gain=0), and with the Rotel preamp I don't know at which volume setting that is, but it is unnecessary information.
ChristopheComment
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so basically, I'm not hearing something unusual, I just need to recalibrate all the speakers to balance their outputs properly, right? Is it also safe to assume that the Rotel 1075 amp is more powerful than the Denon 2805's amp section and I can turn up the volume to the desired level?Comment
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Yes, go for it. You'll get 2x as much current to drive the speakers as the resistance falls below nominal for some frequencies, something the Denon cannot do. You should notice the bass is much cleaner, tighter, more controlled.Originally posted by BlazeMasterComment
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