Use a reference Track ( turn it down 3 db [Dave Pensado], other mixer engineer like to turn down 10 db)
Please note that it is normal that your own Mix with your own tracks sound less good than the mix of someone else.
Why sometime 1h mix is better than 12 hours mix ? 1h => Goes to the essential | 12h => being to technical
Rules are here to be ignored not broken.
Always check your mix in Mono : if in mono the mix sounds good : In Stereo should not be a problem ( phase / correlation, etc )
Always start to mix after a Gain Stagging / Balance.
RMS vs PEAK:
The Root-mean-square value of sine Wave of current is 70.70% of the Peak value. So to convert Peak value to RMS value, multiply by 0.707. To convert RMS value to
Peak value, divide by 0.707.
The highest gain adviced for Mixing is 85dB. Do your Mix always at the same Gain-Level, otherwise you will have to face the Psycho-Acoustic illusion( louder sounds better ...), which is wrong.
Always Mix at the same Volume to feel the difference between mixes
Technic 1 : With a master reference track
Take a wav ref track into the daw, put it at -10dB, put your 'Mixer output physical knob' at 2 o' clock,
set the volume of the Sound card (eg:RME) to what you like ( in Gerneral Max 85dB, but for myself "romain" : 75dB), your speakers are now calibrated, now always mix at 2 o'clock.
When Mastering a song put the knob at 10 o'clock.
Technic 2 : With Pink Noise
Put Pink Noise in your daw at -20dB. Use an SPL App (C Slow threshold), and be sure you get the same amount of dB when pan Left and Right.(Max 85dB)
Impedance Amp & Speakers
In general try to have always the same impedance between Amp and Speakers.
Otherwise read below :
If Amp Impedance < Speaker Impedance = OK = 4 ohms < 8 ohms