Appendix E: Numerical Values for NC and RC Curves

For convenience when performing computations with noise criteria or room criteria data, the following tables list sound pressure levels in dB at 125 to 4000 Hz for both NC and RC curves from Chap. 4.

NC Table

Curve	Sound Pressure Level (dB)
125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
NC-65	75	71	68	66	64	63
NC-60	71	67	63	61	59	58
NC-55	67	62	58	56	54	53
NC-50	64	58	54	51	49	48
NC-45	60	54	49	46	44	43
NC-40	56	50	45	41	39	38
NC-35	52	45	40	36	34	33
NC-30	48	41	35	31	29	28
NC-25	44	37	31	27	24	22
NC-20	40	33	26	22	19	17
NC-15	36	29	22	17	14	12
Threshold*	22	13	8	5	3	..

RC Table

Curve	Sound Pressure Level (dB)
125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
RC-50	65	60	55	50	45	40
RC-45	60	55	50	45	40	35
RC-40	55	50	45	40	35	30
RC-35	50	45	40	35	30	25
RC-30	45	40	35	30	25	20
RC-25	40	35	30	25	20	15
Threshold ^[*]	22	13	8	5	3	..
^[*]Approximate threshold of hearing for continuous noise by listeners with normal hearing.

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Appendix E: Numerical Values for NC and RC Curves

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