Now it's your turn. Please calculate the following:
1. In acoustics, the threshold of pain is approximately 120 dB SPL. How much pressure is this, in
2. Using a VOM (volt-ohm meter), you measure a 0.13 volt signal. How would you express this
quantity in dBu? dBV? dBu?
3. Express -4 dBu using dBV.
4. What is the sum of two signals (-4 dBm and -3 dBm) in dBm? (Careful: will the sum of the two
signals be lesser or greater than either signal alone? Make sure your answer makes sense.)
5. What is the sum of two signals (-4 dBV and -3 dBV) in dBu? (See caution above.)
Make sure to always include units. Please post your calculations (and show your work!) accompanied
by your observations:
Can you see the value of using o dB references?
Does anything remain confusing to you about working with o dB reference levels?
Are there any additional insights that you can share with your fellow classmates to help solidify
103 dB SPL
Mic sensitivity: Mic Pad Mic preamp: Rec. level: Power Amp:
@ 4, fect
1 Pa yiclds -42 dBV -12 dB T 62 dB -6 dB 1.75V yields
IW yicids 85 dB SPL
52 W into 812
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