during cost analysis you will also compare the proposed cost elements with i actual costs ii previous cost estimates for same or similar work iii other cost estimates iv independent government estimates and v forecasts of planned expenditures
How Decibels Apply to Music and Sound. In music, decibels are a measurement of Sound Pressure Level (SPL). When we say the speakers at a rock concert are playing at 110dB, what we really mean is that theyâre playing at 110dB SPL. Since the decibel is only a ratio, 110dB is actually a comparison to a different number: 0 SPL.
1 20 to 20,000 Hz is generally accepted as the audible frequency range, this is the standard for most headphones.  Some headphones offer wider ranges (for example, 5 to 33,000 Hz), but better frequency response does not always mean better sound quality.