Question: Will using an accessory microphone with an extended frequency range improve the quality of the recordings?

Using an accessory microphone with an extended frequency range may not improve the quality of the recordings in a DS-2200. The recorder has an overall frequency response of 300 Hz to 8,000 Hz, but the different quality modes modify the detail of the saved file data by saving some frequencies and discarding others. This is how the recorder varies the potential recording time and uses the built-in Flash memory more efficiently.

The table below shows the overall frequency response in the different quality modes:

Quality ModeOverall Frequency Response
Stereo HQ Mode300-8,000 Hz
HQ Mode300-7,000 Hz
SP Mode300-5,000 Hz
LP Mode300-3,000 Hz

The different quality modes save the digital record of the recordings with different levels of faithfulness to the original sound. The Stereo HQ mode is recommended for music, drama, or interviews that may be made for broadcast. Stereo HQ (High Quality) Mode makes a very detailed record of the sound and uses a wide frequency range that uses up the available Flash memory very rapidly. Lower quality modes, such as SP (Standard Play) and LP (Long Play), make a less detailed digital record of the sound and use a narrower frequency range and use up the available Flash memory much more slowly. These modes would be used for audio note taking or recording college lectures or seminars in which large content is more important than high audio quality.
Verification Source: Olympus Website