The DAC212 Signature Edition, is probably the most intelligent digital pre-amp produced today. It is the perfect integration of audiophile technology and intelligent software.
The unique software lets you configure the DAC212SE to suit your needs and requirements, without degrading the audiophile performance.
When we designed the original DAC212RCA, we made a very thoughtful consideration to have a very short signal path and a very compact circuit with only the most essential components to guarantee the best possible performance.
Essentially the internal architecture of the DAC212RCA is already balanced/differential, and all the benefits of a balanced design including Common Mode Rejection (CMR) are fully utilized.
Due to the demand for an XLR version of the DAC212 we decided to convert the DAC212RCA to XLR.
The design team didn’t take the conversion to XLR lightly by just adding an XLR connector but we came up with a design that maintains the superior performance of the highly appreciated DAC212RCA, but now in a true differential design from input to output.
Balanced XLR connections have the reputation to be “superior” to unbalanced connections. In reality this statement is more subtle and only if done right, will a true differential circuit benefit the sound quality.
Making a design balanced often doesn’t come without penalties. In most cases, noise and distortion will be doubled.
When designing a balanced circuit there are basically two things that really matter.
Common Mode Rejection (CMR). This principle works as follows. A differential amplifier receives a differential/balanced signal (this means two poles in opposite phase), then a subtraction amplifier amplifies the “difference” between the two voltages.
This has a great benefit that other signals will not be “seen” by the circuit. Those “other signals” can be internal or external emissions and noise fields. We call this “Common Mode Noise” hence the name “Common Mode (Noise) Rejection”.
Low inductance PCB routing.True differential designs give the opportunity (often this possibility is not used in many PCB designs) to route them as a tightly-coupled pair. This implies that the two magnetic fields partly cancel each other out, which results in a lower inductance design. In turn this contributes to lower distortion and a purer signal transmission.
- True Differential Output-stage
- Double CMR at each halve of the circuit
- No inverters
- Differential in > Differential out
- PCB routing can be as coupled differential pairs, keeping loops small and allowing very low inductance design.