How Do U Know Mono Amps Are Good What The Diff

[creyc]

Class BD Invented by Robert B. Herbert in 1971 U.S. patent 3,585,517 and improved on by Neil Edward Walker as disclosed in his 1971 U.S. patent 3,629,616. Both patents are concerned with improving original class D design efficiencies by using various bridge connections and cancellation techniques. And most recently more improvements are claimed by inventors James C. Strickland & Carlos A. Castrejon in their U.S. patent 6,097,249 assigned to Rockford Corporation in 2000 for their Fosgate-brand automotive amplifier.

GRS comments: "This is a class designation that would best be forgotten. It has been applied to multiple modulation schemes on a class D derived full-bridge. This is perhaps the most reinvented class design in recent history with "filter-less amplifiers" and other such things. An interleave of two class D full-bridge is what we actually have here, and it is a good improvement to an interleave of one class D full-bridge. However an interleave of four is actually possible on a full-bridge if one uses Class I design."

More than you wanted to know about class BD amplifiers.

[jonatan]

More than you wanted to know about class BD amplifiers.

thanks guys, so bd is just a beter version of a class D amp as far as clean nes

Edited March 5, 2009 by jonatan

[MickyMcD]

Your question has been answered, however I just thought I'd chime in on the topic header.

When I'm looking for suitable amplification, it really depends on what I want out of it. If I wanted raw, gut wrenching testicle popping trouser flapping power, I'd be after a solid PCB, overbuilt power supply, large heatsinks or fan forced heat dissipation, high current draw (it takes power to make power) with sacrifices on damping factor and THD. Look closely on what protection is offered. DC output crowbars, full short, partial short, over temperature, power supply fault and some form of distortion limiting are required. Low pass is a must, and a high gain structure is preferable.

If I was after a great wide spectrum amplifier, I personally go for extremely low THD, very high damping factor (>1000 20Hz-20kHz), fast slew rate, fast power supply (NO transformer sag) and good routing options and features like filters.

Last, but not least, brand name. Brands earn a reputation for a reason, often it is a good mud map on quality.

Cheers,

Mick