No. FEL[7:6] sets the EL frequency range of all EL outputs where selection 00 sets the frequency range of 50-100 Hz. An EL frequency setting below 50 Hz is therefore not possible.
MAX14521E
Recommended for New Designs
The MAX14521E is a quad-output high-voltage DC-AC converter that drives four electroluminescent (EL) lamps. The device features a 2.7V to 5.5V input range...
Datasheet
MAX14521E on Analog.com
No. FEL[7:6] sets the EL frequency range of all EL outputs where selection 00 sets the frequency range of 50-100 Hz. An EL frequency setting below 50 Hz is therefore not possible.