Bob Katz hat geschrieben:HOW TO OPTIMIZE GAIN STRUCTURE IN ONE QUICK STEP! If you do the following, you'll never overload, you'll have very good signal to noise ratio and you'll have plenty of gain for any piece of music that's been made (provided you are not deaf):
Download a file of narrow band pink noise from my website. I think you have to register to get to the downloads. If you have any difficulty registering, write me at
bobkatz@digido.com. There's a left channel and a right channel file. Download both of these
http://digido.com/media/downloads/categ ... neral.html In the list below, find the left and right narrow band pink noise files.
In your convolver: Set your individual filter gain to 0 dB. If you do not have an analog master gain control, start with your convolver volume control set to -20 dB, just in case!!!! Most people have a lot of excessive gain in their systems.
Play the left channel file. Then play the right channel file. The sound level at the listening position should be around 83 dB SPL, C weighted, slow with the filter gain at 0 dB and the master volume at 0 dB.
If the SPL is not 83 dB, then try to adjust the DAC analog trims, or the power amplifier trims or other analog trims until it is 83 dB SPL.
If you have too much level, there is an inline adjustable attenuator sold by Cranesong. Its minimum attenuation is 6 dB so you must have at least 6 dB extra level you want to get rid of.
This calibration will provide you more than enough (maximum) monitor gain to play just about any music recording or feature film that has ever been made without having a high noise floor. Provided you have high grade DACs, preamplifiers and amps. For most music, more than likely you will be running your monitor gain between -7 and -14 dB depending on the kind of material you like to listen to.
WHAT TO DO IF YOU DO NOT HAVE ENOUGH ANALOG GAIN:
If it's only 2-4 dB low, then just add gain in the individual filters. Examine the peak level of the material on Acourate Convolver metering to ensure it does not overload. If you are using a crossover, see if there is a digital meter in your interface that can show you the level of each individual channel output.
WHAT TO DO IF YOU HAVE TOO MUCH ANALOG GAIN:
If it's up to 6 dB too much, and you do not hear any hiss or hum from your loudspeaker outputs, then calibrate your system by attenuating the individual filter gains.
If it's more than 6 dB too much, you probably have excessive gain and may even be hearing noise from your loudspeakers already. First, ensure that you did not miss a hidden gain control or gain switch you can throw somewhere in your system. Then, if you are sure, consider the Cranesong attenuators or make some attenuators on your own.