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This paper reviews the irregular acoustic properties of pink noise and its improper use as a common reference sound source, and proposes hi-pass pink noise as a new reference sound source. Hi-pass pink noise can be identified as a sound source created by eliminating unnecessary energy below the audible pitch range in pink noise. Compared to regular pink noise, hi-pass pink noise of 20 Hz had a minimum of 20% reduction in energy and a marginal increase of 0.7dBFS amplitude, while hi-pass pink noise of 40 Hz had 30% reduction in energy and 1.6dBFS marginal increase in amplitude. In spite of such changes in physical features, hi-pass pink noise does not produce any audible difference. The paper also suggests that Comfortable Maximum Level (CML) can be utilized as a standard volume when comparing multiple sound sources.