Class TD® and DSP
Class TD
The first sketches for what would become the Class TD design were drawn during a lunch break in 1988. The basic idea was to combine the excellent sonic characteristics and reliability of a class B amplifier with the efficiency of a class D design. This would allow higher power while reducing both size and weight.
A year later, the first circuit boards were finished, but the test results were disappointing. A complete redesign was commenced, based on what was learned from the first attempt. Success was achieved in the second round, and soon incorporated into the LAB 2000. The top of the range LAB 4000 (introduced in 1998) demonstrated the continuing development and implementation of Class TD and set a new power level for professional touring amplifiers with its prodigious output of 3200 W per channel (2 ohms).
The Class TD design was patented, and continues as a foundational element in new Lab.gruppen amplifiers and powered loudspeaker management systems.
LAB 4000
With double the power of the LAB 2000, the LAB 4000 took Lab.gruppen into the market for amplifiers with very high power output.
DSP 24
The DSP 24 was a 2-in/4-out digital crossover and loudspeaker equalization unit.
It provided 66 bands of digital parametric equalization and adjustable time delay for each output channel. This DSP project fostered the development of FIR and IIR digital filtering, and also introduced VIEW, Lab.gruppen’s first Windows-based control software program.