What is a class T amplifier?

A class T amplifier is a type of class D amplifier except that it has some characteristics based on advanced technology in switching modulation and feedback techniques, such as very high switching frequencies, sigma-delta type pulse width modulation, and other usually proprietary features that are not published as generally available information. What might be some of the advantages of this type of design? We can expect that the higher switching frequency would help to reduce distortion and lower noise. Sigma-delta modulation spreads out the switching frequency over a range of frequencies which helps to reduce EMI testing problems.

What would we expect to be the disadvantages of the class T system? The variable switching frequency has some disadvantages over a fixed frequency system, especially in testing, and filtering out the switching frequency in the final output signal. The circuitry is usually more complicated and harder to design than the classical fixed frequency ramp generated pulse width modulation.

Should you buy a class T system? This is a question of personal taste, but I can tell you that the class T system has been very well accepted by large companies that are including the system in TV’s and home theatre systems. If the system sounds good and you do not want to spend a lot of money on high end equipment, class T may be good for you. If you are looking for a high end system you may want to shop carefully and do your research first. You may still find that a class T system is great and just right for you. Good hunting and good listening.