Audio specifications
WAV
Sampling frequency of 44.1, 48 or 96 kHz, at 16 or 24-bit.
MP3
44.1 or 48 kHz with a bit-rate of 32, 64, 96, 128, 192, 256 or 320 kbps.
Frequency response
44.1 kHz
20 - 20 kHz +1/-3 dB
48 kHz
20 - 22 kHz +1/-3 dB
96 kHz
20 - 42 kHz +1/-3 dB
Total harmonic distortion and S/N ratio
These two values testify the excellent electronics. The total harmonic distortion is 0.02%, while the S/N ratio is a valid 90 dB.
Some innovations
It can work in three different modalities. Let's see them.
Dual
When this mode is active it will make a duplicate of the file, but with a lower level, up to -12dB. The result is that if the first file is distorted, for example for an input level jump, you have a second copy. Obviously, this is not the only function to avoid distortion. In fact this device features a low cut filter and an analog limiter.
Line
It generates two files simultaneously. The first from the built-in mics, the second from the line input. This is a perfect solution if you want to work on the two files separately, for example with an editing software on the PC.
Mix
It works like the Line, so it records simultaneously from the built-in mics and from the line input, but this time the DR-2d will create a stereo file, not two.
Effects
Six different reverbs: RevHall 1, RevHall 2, RevRoom, RevStudio, RevPlate 1, RevPlate 2.
General opinion
It features an excellent electronics, some advanced and innovative modes for the recording and useful functions such as the Variable Speed Audition, a function to slow down the playback without changing pitch, a looper and a metronome. In addition, it provides various reverbs. The price, approximately 290 Euros, is not low, but the DR-2d is modern and innovative. My opinion is positive.