The C (256 Hz) and G (384 Hz) tuners create a “perfect fifth” and open the gateway for healing and higher consciousness. ( Dr. John Beaulieu )
Solar Harmonic Spectrum is derived from Pythagorean Mathematics
Opens Gateways 
( Heart Chakra ) 
Equilibrium
Note : G

Polarity Therapy (John Beaulieu research and development of the Harmonic Spectrum tuning forks.)

Stimulate AIR with 256Hz & 384Hz
Sedate AIR with 256Hz & 341.3Hz

Stimulate FIRE with 256Hz & 320Hz
Sedate FIRE with 256Hz & 426.7Hz

Stimulate WATER with 256Hz & 288Hz
Sedate WATER with 256Hz & 480Hz

Balance EARTH with 256Hz &/or 128Hz
Balance AETHER with 256Hz & 512Hz