User Guide for LYNGDORF models including: TDAI various models, SDA-2400, SDA-2400 Elite Audio, SDA-2400, Elite Audio, Audio

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How to do bi-amping with TDAI amplifiers and SDA-2400
The Lyngdorf TDAI integrated amplifiers allow to add one or more SDA-2400 power amplifiers for bi-amping a loudspeaker. This guide explains the right settings to achieve the optimal performance.
Warning:
· These setups can only be completed with loudspeakers providing separate inputs for high and low frequencies (bi-amping), or high, mid and low frequencies (tri-amping).
· The inputs must be completely separated both outside and inside the speakers. Bridges (metal bars or cables) between the speaker binding posts must be removed.
· Never connect the speaker outputs of two amplifiers together in any way, as this will cause both amplifiers to defect beyond repair.
· Keep all amplifiers switched off when working with speaker cables!
Using a high-frequency filter for bi-amping with Class-D amplifiers
Using Class D amplifiers like the Lyngdorf SDA-2400 for a bi-amping setup without enabling any filters is generally not recommended. In a Class D amplifier an output filter turns the switching output signal from the amplifier into an analog signal which powers the speaker.
With bi-amping, the amplifier powering the bass has no speaker-load in the high-frequencies, the energy from these frequencies will turn into heat in the output filter. If the components of the output filter break, the speaker drivers will be damaged.
Lyngdorf amplifiers employ a sophisticated design, and we have not yet experienced a broken output filter, but in order to protect the amplifier and speakers from potential damage, you should activate the built-in digital crossover of the TDAI integrated amplifier and remove the high-frequency energy (above 5,000 Hz) from the SDA-2400 power amplifier driving the bass. This adjustment will have no audible side effect.
Go to Setup > Output Setup > set Line Out or Digital Out to Advanced. Set the > Crossover filter to > Low Pass and the > Frequency to 5000 Hz.
Use of the Digital Crossover filters
Having a digital crossover in the TDAI leads many to want to use this function in their bi- amping setup. However, you should not apply the digital crossover to substitute for the passive crossover network in the loudspeakers, because the crossovers inside the loudspeakers are still active in a bi-amping setup.
While digital crossover filters will allow that each amp only amplifies a given frequency bandwidth, applying another set of crossover filters on top of the speaker's own filters is not recommended.
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Setting a signal delay When using a digital connection from the TDAI to the SDA-2400 power amp, the digital signal will be processed in the SDA-2400, and the resulting signal delay of 0.6 ms (miliseconds) must be compensated for in the TDAI. This will time-align the TDAI with the SDA-2400. Go to Setup > Output Setup > set Line Out or Digital Out to Advanced. Set the > Delay (in ms) to 0,6 Note: When using an analog connection from the TDAI to the SDA-2400 power amp, no signal delay needs to be set.
RoomPerfectTM to finish the bi-amping setup Finally, you need to do a RoomPerfectTM calibration, which will further align frequencies and levels. Then you will then enjoy the greatest performance possible from your loudspeakers!
Step-by-step instructions 1. Prepare the speakers by removing the bridges between the two sets of inputs. 2. Run the speaker cable between the TDAI and the "Mid-High" speaker connectors. 3. Run the speaker cable between the SDA-2400 and the "Low" speaker connectors. 4. Set the input selector of the SDA-2400 to the chosen signal input. 5. Connect the TDAI and SDA-2400 to mains power. 6. Set the menu of the TDAI:
· Advanced Settings > Outputs > Digital Output or Analog, depending on your connection to the SDA2400 input. Set to Low Pass and set Output Level to -3.0 dB. This will align the output levels of the two amplifiers.
· When using a digital connection: Advanced Settings > Outputs > Delays ­ under Digital Output set the Amp. Delay to 0,6mSec.
· Advanced Settings > Outputs > Low Pass Filter ­ set to LR, 2nd Order and enter 5000 Hz. 7. Perform a RoomPerfectTM calibration and follow the instructions.
Example of a TDAI-2170 used for high frequencies, and SDA-2400 for low frequencies
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