Before we begin recording, we need to know your requirements for the output files. This includes the following parameters:
- Sampling Frequency (e.g. 44.1 kHz / 48 kHz)
- Bit Depth (e.g. 16 bit, 24 bit)
- Encoding Format (e.g. mp3, wav, OGG Vorbis, AIFF)
- Mono or Stereo (default mono for voice)
- Output Levels (LUFS)
Sampling frequency and bit depth are the most important parameters to know before we begin recording. The reason for this is that we will record the voice performances at the desired output bit rate to avoid having to re-sample for the final output (which could affect quality).
For recording voice performances, 16-bit / 48 kHz is our default, and is generally sufficient to capture the voice with clarity. If needed, we can record up to 24-bit and 192kHz.
If the output files will be delivered in MP3 format, please let us know whether the project requires Variable Bit Rate (VBR) or Constant Bit Rate (CBR). If VBR is needed, we will deliver at the highest possible target quality unless otherwise requested. If CBR is requested, we will use 256kbps. We prefer not to go below 192kbps, in order to avoid audible compression artifacts.
We will set overall volume and use some dynamics processing in order to normalize audio levels of the delivered output files. By default, we will strive for peaks at no greater than -6 dB and overall levels of -19 LUFS for mono files. Depending on the nature of the material, the energy, and therefore the volume may vary. If you have a specific requirement, please let us know. Also, if you have existing audio that you want the levels to match, you may send us the sample file and we can analyze it and match the levels.
Hopefully, outlining the output requirements up front will help ensure that you get the best quality recording for your project. If you have any questions, please let us know and we will be happy to work with you!