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THX Loudness Plus™ is a volume control technology featured in THX Certified Dominus, THX Certified Ultra and THX Certified Select Certified AV Receivers, preamps and amplifiers that automatically adjusts the front-to-back speaker level relationship as you turn the volume down. With THX Loudness Plus, home theater audiences can now experience the rich details of surround …

WHAT IS THX LOUDNESS PLUS?

PATENTED DISTORTION-REDUCTION TECHNOLOGY. As part of THX’s ongoing pursuit of excellence, our engineers focused on ways to minimize distortion in the audio electronics chain. The THX patented technology uses a unique combination of feedback and feedforward error correction to make the distortion vanishingly small. Our engineers then used this patented distortion-reduction scheme to reduce some …

HOW DOES THX AAA WORK?

THX Loudness Plus incorporates two THX Technologies. As the user changes the volume, THX Multi-channel Spectral Balancing™ and THX Dynamic Ambience Preservation™ automatically and seamlessly apply the appropriate compensation. This delivers a more accurate listening experience at any volume level. THX Multi-channel Spectral Balancing™ Adjusts frequency response to counter the perceptual loss of low and …

HOW DOES THX LOUDNESS PLUS WORK?

One way to achieve a “green” solution is to reduce the bias current flowing through the output devices. This has two effects: it reduces the idle dissipation (good) but increases the crossover distortion (bad). By applying the THX patented circuit, it is possible to virtually eliminate the crossover distortion while retaining the benefits of lower …

HOW DO I ACHIEVE A COOL-RUNNING, GREEN, COMPACT SYSTEM?

The distortion reduction in the THX AAA technology has an additional benefit: it dramatically reduces power supply-induced distortion and noise — a high PSRR (power supply rejection ratio). In any amplifier, when the power supply works hard under heavy load conditions, it can introduce unwanted distortion and noise in the output signal. The THX patented …

HOW DOES AAA REDUCE DISTORTION?

Crossover distortion occurs in many amplifiers when the audio signal is “handed off” from an amplifier’s positive-going output device to its negative-going device and vice versa. This transition is never perfect, resulting in crossover distortion that is spiky in nature and rich in high-frequency distortion products. Moreover, the problem becomes more audible as the signal …

HOW DOES AAA REVEAL EVERY LOW-LEVEL DETAIL?

THX Achromatic Audio Amplifier (AAA) is an analog amplifier technology that combines the qualities of the finest Class A amplifiers with greatly reduced energy consumption. It has ability to drive heavy and difficult loudspeaker loads to full output while maintaining impeccable performance. THX AAA produces the purest performance of any amplification technology now available, ensuring …

WHAT IS THX AAA?