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Also see the Equalizing Presets Thread on the Fender Forums for additional information.

Tips and Tricks: Leveling Presets (posted by MusicLaw)

The Sound Pressure Levels (SPL) of the Seventeen (17) Basic Modeled Amps in the (v2) Mustang III/IV/V factory Presets 83 through 99 vary dramatically -- by as much as 10dba with the Mustang's Master Volume set at 3 (or 4)! Many users find it helpful to equalize the Volumes amongst the modeled amp Presets to subsequently customize further and save.

These 17 factory Presets have their FX banks set to "Empty." This presents each modeled amp's unique sound characteristics with its own distinct factory default configuration of parameter value settings.

Measured at a distance of Three Feet (3') perpendicular to the front center of the speaker cabinet an A-weighted, calibrated db meter was used to measure the SPLs of the 17 factory default modeled amp Presets with the (v2) Mustang IV's Master Volume set at 3 and 4. The results are below.

As the Basic Preamp modeled amp (Preset 83) produces the quietest SPL, and has a factory default Preset Volume value setting of 10, this Preset's SPL value was used as the reference. The Preset Volume of each of the other 16 factory default Basic Amp Presets were noted and then attenuated (reduced) to approximately equalize their respective SPLs to that of the Basic Preamp Preset. That information is below.

The test used an Epiphone Les Paul Custom Pro with both Probucker pickups in the normal phase position with the guitar's vol and tone pots wide open. An open G chord was aggressively strummed repeatedly using a pick to attain the highest SPL. The REMUDA App was used for Amp control values.

Preset # Amp Name Preset Vol SPL @ MstrVol 3 Preset Vol to Equalize
(achieve SPL of 90dba)  
83 Preamp 10 90 dba 10
84 57 Champ 7 92 dba 6.5
85 57 Deluxe 7 96 dba 4.5
86 57 Twin 7.1 97 dba 4.5
87 59 Bassman 7 98 dba 4.2
88 65 Princeton 7 96 dba 5
89 65 Deluxe 7 98 dba 4.5
90 65 Twin 7 100 dba 3.5
91 60's Thrift 6.8 99 dba 3.8
92 Brit Watts 7.6 96 dba 5.5
93 Brit 60's 7 92 dba 6
94 Brit 70's 7 93 dba 5.8
95 Brit 80's 7 92 dba 6
96 Brit Colour 6.3 93 dba 5.5
97 Super-Sonic 8.4 95 dba 6.5
98 90's Stack 8.3 95 dba 6.3
99 2000 Metal 7.9 93 dba 6.8
Preset # Amp Name Preset Vol SPL @ MstrVol 4 Preset Vol to Equalize
(achieve SPL of 100dba)
83 Preamp 10 100 dba 10
84 57 Champ 7 104 dba 5.8
85 57 Deluxe 7 106 dba 4.5
86 57 Twin 7.1 107 dba 4.5
87 59 Bassman 7 109 dba 4
88 65 Princeton 7 105 dba 5
89 65 Deluxe 7 108 dba 4.5
90 65 Twin 7 110 dba 3.5
91 60's Thrift 6.8 109 dba 3.8
92 Brit Watts 7.6 105 dba 5.5
93 Brit 60's 7 103 dba 5.8
94 Brit 70's 7 104 dba 5.5
95 Brit 80's 7 103 dba 6
96 Brit Colour 6.3 104 dba 5
97 Super-Sonic 8.4 105 dba 6
98 90's Stack 8.3 105 dba 6
99 2000 Metal 7.9 104 dba 6.5

Also see the Equalizing Presets Thread on the Fender Forums for additional information.