P.474  §5 In the superuniverse of Orvonton there are one hundred octaves of wave energy. Of these one hundred groups of energy manifestations, sixtyfour are wholly or partially recognized on Urantia. The sun's rays constitute four octaves in the superuniverse scale, the visible rays embracing a single octave, number fortysix in this series. The ultraviolet group comes next, while ten octaves up are the X rays, followed by the gamma rays of radium. Thirtytwo octaves above the visible light of the sun are the outerspace energy rays so frequently commingled with their associated highly energized minute particles of matter. Next downward from visible sunlight appear the infrared rays, and thirty octaves below are the radio transmission group. 
Suppose the above counting begins from 1 Hz. (If the starting point is X Hz, then later we can simply multiply everything by X.)
If we count from 1 Hz, the first octave begins at 1 Hz and ends at 2 Hz. The second octave ends at 4 Hz, the third at 8 Hz, the fourth at 16 Hz, and the fifth at 32 Hz. Thus, the tenth octave above ends at 1024 Hz, each octave doubling the preceding range. 2 raised to the 10th power is approximately 1000 or 1K Hz. Thus, 10 octave above 1 Hz ends at 1 Kilohertz or simply 1 KHz. 20 octave above ends at 1 megahertz or 1 MHz. 30 octave above ends at 1 gigahertz or 1 GHz. 40 octave above ends at 1 terahertz or 1 THz. Since the sixth octave ends at 64 Hz, the forty sixth ends roughly at 64 THz. (See the table below)
Approximated ranges  Accurate ranges  Ending frequency 
(10^{27}  10^{30} Hz)  1, 237, 940, 039, 285, 380, 274, 899, 124, 224  1, 267, 650, 600, 228, 229, 401, 496, 703, 205, 376 Hz 
The hundreth octave ends roughly at 10^{30} Hz. 
(10^{24}  10^{27} Hz)  1, 208, 925, 819, 614, 629, 174, 706, 176 1, 237, 940, 039, 285, 380, 274, 899, 124, 224 Hz 
The ninetieth octave ends at 10^{27} Hz. 
1 Zettahertz  1 Yottahertz (10^{21}  10^{24} Hz) 
1, 180, 591, 620, 717, 411, 303, 424  1, 208, 925, 819, 614, 629, 174, 706, 176 Hz 
The eightieth octave ends at 10^{24} Hz. Octaves #47  78 are outer space rays. 
1 Exahertz  1 Zettahertz  1, 152, 921, 504, 606,846,976  1, 180, 591, 620, 717, 411, 303, 424 Hz 
The seventy octave ends at 10^{21} Hz 
1 Petahertz  1 Exahertz  1, 125, 899, 906, 842, 624  1, 152, 921, 504, 606,846,976 Hz 
The sixtieth octave ends at 10^{18} Hz 
1 Terahertz  1 Petahertz  1,099,511,627,776  1, 125,899,906,842,624 Hz 
The fiftieth octave ends at 10^{15} Hz 
35, 184, 372, 088, 832  70, 368, 744, 177, 664 Hz  The forty sixth octave ends at 70, 368, 744, 177, 664 Hz 

1 Gigahertz  1 Terahertz  1,073,741,824  1,099,511,627,776 Hz  The fortieth octave ends at 10^{12} Hz 
1 Megahertz  1 Gigahertz  1,048,576  1,073,741,824 Hz  The thirtieth octave ends at 10^{9} Hz 
1 Kilohertz  1 Megahertz  1,024  1,048,576 Hz  The twentieth octave ends at 10^{6} Hz 
1 Hertz  1 Kilohertz  1  1,024 Hz  The tenth octaves ends at 1024 Hz 
If we use 1024, rather than 1000, for 10 octaves, then Octave #46 ends roughly at 70 THz (70, 368, 744, 177, 664 Hz). Since the visible light ends at 750 THz, 750/70 is slightly greater than 10. Thus, let us assume the starting octave is 10  20 Hz (rather than 10.5  21 or 11  22 Hz). Ten octave above the visible light is 750 petahertz, which is within the range of Xrays (30 Petahertz  30 Exahertz). Multiplying the above numbers by 10, we have the correct ranges below:
It is interesting to note that human ears are sensitive to vibrations, 16 Hz  20 KHz. So the starting octave is in the range where human ears can almost hear. Perhaps that is the range where the "still small voice" speaks.