Music & Audio Advice Audio Interface and Signal Flow 3 — Questions and Answers
Question 1: What is 'latency' in the context of an audio interface?
- The delay between input and hearing the processed signal back (Correct answer)
- The maximum recording sample rate
- The noise floor of the preamp
- The impedance of the inputs
Correct answer: The delay between input and hearing the processed signal back
Latency is the round-trip delay caused by converting, processing, and returning the audio signal.
Question 2: Lowering the audio buffer size in your DAW will generally do what?
- Reduce latency but increase CPU load (Correct answer)
- Increase latency but lower CPU load
- Improve the bit depth of recordings
- Disable phantom power
Correct answer: Reduce latency but increase CPU load
A smaller buffer shortens latency but forces the CPU to process audio more frequently.
Question 3: Which connection type carries a balanced analog signal that rejects noise over long cable runs?
- TRS or XLR balanced cable (Correct answer)
- TS unbalanced instrument cable
- RCA unbalanced cable
- USB data cable
Correct answer: TRS or XLR balanced cable
Balanced TRS and XLR cables use differential signaling to cancel induced noise.
Question 4: What is the standard nominal operating level for professional studio gear?
- +4 dBu line level (Correct answer)
- -10 dBV consumer level
- Mic level around -50 dBu
- Speaker level around +30 dBV
Correct answer: +4 dBu line level
Professional equipment typically operates at +4 dBu, while consumer gear uses -10 dBV.
Question 5: You want to record a synthesizer's stereo line output into your interface. Which inputs should you use?
- Two line-level inputs set to line, one per channel (Correct answer)
- A single mic input with phantom power
- The Hi-Z instrument input only
- The digital S/PDIF input only
Correct answer: Two line-level inputs set to line, one per channel
A line-level stereo source needs two line inputs, one for left and one for right.
Question 6: What is the purpose of a pad (-20dB) switch on an interface or preamp?
- To attenuate a very hot input source and prevent clipping (Correct answer)
- To boost a quiet signal before recording
- To add phantom power gradually
- To convert mic level to instrument level
Correct answer: To attenuate a very hot input source and prevent clipping
A pad reduces the incoming signal level so loud sources do not overload the preamp.
Question 7: In a typical signal chain, where is a digital-to-analog (D/A) converter used?
- When sending recorded audio out to monitors or headphones (Correct answer)
- When a microphone first enters the preamp
- When amplifying an instrument signal
- When applying phantom power
Correct answer: When sending recorded audio out to monitors or headphones
The D/A converter turns the computer's digital audio back into analog for playback through speakers.
Music & Audio Advice Audio Interface and Signal Flow 3
What is 'latency' in the context of an audio interface?