Used | Lab-Gruppen - FP 3400

Designated Class TD®, the FP 3400 contains the same high efficiency as Class D, but avoids the inherent drawbacks. For example, a typical Class D topology employs Pulse Width Modulation (PWM) to achieve high efficiency, but this requires a steep recovery filter between the output stage and the loudspeaker. In contrast, Lab.gruppen’s Class TD design keeps the audio signal within the analog domain, eliminating the need for filtering and therefore offering the same sonic quality as a traditional Class AB amplifier.

• DC protection – Blocks infrasonic signals due to fault conditions
• VHF protection – Protects the loudspeakers from sustained (non-musical) very high frequency signals above the audible range.
• Thermal protection – Protects the amplifier from overheating. The protection warning indicators on the front panel illuminate before the protection process is initiated.
• AC protection – Shuts down the power supply if the line voltage is outside the operating voltage.
• Clip limiter – Prevents severely clipped waveforms from reaching the loudspeakers while maintaining full peak power.