Lyngdorf Audio Room Perfect TDAI 2200 - Manual (Page 4)

4
In- and outputs
Traditionally, interconnects are a big discussion point in the hi-fi industry. And they can indeed
make a world of difference on most equipment. Why? Because most equipment is not
engineered correctly in the first instance and is often compromised by varying input and output
impedances. And thanks to different ground potentials/planes between different components,
you also run the risk that current can run from one component to another through the
interconnects. It doesn’t require much imagination to see how that might influence sensitive
low-level audio line signals.
In the Lyngdorf Audio TDAI-2200 we have taken an extra step (at considerable extra cost) of
adding filtering and ensuring the true galvanic separation of each single input. In that way the
ground planes for the digital and analog domains are completely separated and sound-
deteriorating ground loops are prevented.
The digital inputs comprise 3 SPDIF (RCA/Phono), 1 AES
(XLR), all gold-plated, and 1 Toslink (optical) connections.
The outputs from the digital section comprise digital
outputs (SPDIF, RCA/phono) plus a set of RCA/phono with
analog output signal of the selected source.
The D/A converter used for the analog output is the high
performance Wolfson 8740 DAC, highly acclaimed for its
pure, rich and natural sound. Just as importantly, the
critical re-construction section after the DAC is based on high-end Texas Instruments OPA 227
op-amps and is designed, as are all other signal paths in TDAI-2200, to be fully balanced for
optimum purity and the best S/N ratio.
The optional analog input module comprises 3 RCA/phono unbalanced and 1 AES (XLR)
balanced inputs.
Input selection is carried out via high-end, double gold-plated relays, normally only
encountered in expensive high-precision measuring equipment.
Since analog signal levels can vary considerably, the input sensitivity of each input can be
attenuated by up to -6dB, granting correct signal level for the A/D converter. The sensitivity is
adjusted in the pre-amp section before it is fed to the converter.
The state-of-the-art A/D converter is built to outperform the noise levels of most analog
sources. Listening to the analog output from, say, a high-end CD player through the A/D
converter versus the direct digital signal leaves you asking the question... which is which? This
gives an idea of the performance potential of the A/D converter in the Lyngdorf Audio TDAI-
2200.
Achieving such a performance needs careful selection of the right components and - just as
importantly – considerable design experience, in order to know how to maintain optimum
sound quality throughout the signal path.
Also worth noting is that the signal paths in the TDAI-2200 are fully balanced and individually
impedance compensated (transmission-line principle). Normally, a standard ‘compensation’
resistor is placed right after the signal transmitter for impedance correction. However, this
increases the output impedance and makes the signal path more susceptible to noise. In this