RPM	16⅔	20	33⅓	45	45	77	78	80	160
no. of 50 cy. strobe dots	360	300	180	-	133	77	-	-	-
no. of 60 cy. strobe dots	432	360	216	160	-	-	92	90	45

N.B.: 20 RPM is the speed of some dictation machines.

c=((M×((ƒ/(K)~)²))~)×16
N.B: For arms without a counterweight, M_e=one-half the tracking force (theoretically). For arms with a counterweight, M_e is many times the tracking force and, therefor, the pickup's ability to play warps is greatly reduced.

Where Effective Mass and desired Resonant Frequency are known, the table gives the required Compliance in µcm/dyne.
11 cycles is best for audiophile systems while 40 cycles is best for many systems having a ceramic pickup on an arm without a counterweight.

		
		11	20	30	40	60	80	120
M_e	2.5	83.74	25.33	11.26	6.33	2.81	1.58	.7
	3	69.78	21.11	9.38	5.28	2.35	1.32	.59
	3.5	59.81	18.09	8.04	4.52	2.01	1.13	.5
	4	52.34	15.83	7.04	3.96	1.76	.99	.44
	4.5	46.52	14.07	6.25	3.52	1.56	.88	.39
	5	41.87	12.67	5.63	3.17	1.41	.79
	6	34.89	10.55	4.69	2.64	1.17	.66
	7	29.91	9.05	4.02	2.26	1.01	.57
	8	26.17	7.92	3.52	1.98	.88	.49
	9	23.26	7.04	3.13	1.76	.78	.4
	10	20.93	6.33	2.81	1.58	.7
	12	17.45	5.28	2.35	1.32	.59
	14	14.95	4.52	2.01	1.13	.5
	16	13.08	3.96	1.76	.99	.44
	18	11.63	3.52	1.56	.88	.39
	20	10.47	3.17	1.41	.79
	24	8.72	2.64	1.17	.66
	28	7.48	2.26	1.01	.57
	32	6.54	1.98	.88	.49
	36	5.82	1.76	.78	.44
	40	5.23	1.58	.7	.4
	48	4.36	1.32	.59
	56	3.74	1.13	.5
	64	3.27	.99	.44
	72	2.91	.88	.39
	80	2.62	.79

My own system has an "S-shaped" arm and a pickup that tracks at 1.5g. The resonant frequency is very low and warps are a real problem.
High-resonance systems are (or should be) designed with an allowance for the extra boost at bass frequencies. With these systems, a bass-heavy record may "spit the needle out of the groove".

M_e = Effective mass at end of arm
L = Arm length
M = Mass at end of arm
M = Mass of arm
M_e = (ML²+M(L ⁄ 2)²) ⁄ L²