Tesira Operation Manual

11. Operation and performance
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D SERIES Tesira Operation Manual rev 1.0.0
11. Operation and performance
11.1. Operation precautions
Make sure that the Standby button on the unit’s front panel is either unlit (OFF), or red (STANDBY), before making
any input or output connections. Ensure the AC voltage is within the range printed on the label adjacent to the AC
mains connector. Ensure no input signal is present when powering on the unit to reduce the risk of any inadvertent
bursts of high level audio.
11.2. Power output performance
The D Series uses Lab.gruppen’s patented Class TD technology (Tracking Class D) in the output stages, which
couples the efciency of Class D topologies to the sonic purity of Class A/B designs. The primary benet is that
Lab.gruppen’s Class TD works perfectly under all load conditions. The output maintains its at frequency response
even into complex loads with very low nominal impedances. Reliability is very high, and there is no interference with
nearby RF equipment. Superior efciency allows greater power density while minimizing cooling requirements, yet
sound quality matches that of the best Class A/B designs.
11.2.1. Symmetrical power
D Series models can deliver power as shown in Table 11.1 when all channels are driven equally.
Table 11.1: Symmetrical Load Power Ratings
11.2.2. Rational Power Management™
Rational Power Management™ (RPM) is a unique Lab.gruppen feature that allows for exible allocation of power
across channels of D Series unit. Power that is not used by one output channel is free for use by another output
channel with greater demands. Unique to this range is also that the smaller models in the range have amplier
channels that can produce the maximum channel power of the largest model. Hence, by using RPM, it is possible
to signicantly scale up a channel from its average, which is 25% of the total available power in the frame. RPM
allocates power up to the total limits of the specic amplier model.
Load Impedance (ohms)
2 ohms
(per channel)
2.67 ohms
(per channel)
4 ohms
(per channel)
8 ohms
(per channel)
16 ohms
(per channel)
Hi-Z 70 V
(per channel)
Hi-Z 100 V
(per channel)
D 200:4T/Ta 4400 W 5000 W 4400 W 2300 W 1150 W 3300 W 4700 W
D 120:4T/Ta 3000 W 3000 W 3000 W 1900 W 950 W 3000 W 3000 W
D 80:4T/Ta 2000 W 2000 W 2000 W 1500 W 750 W 2000 W 2000 W