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Audio Amplifier Classes (A, A/B, D, G, and H): What are the Differences?

By | September 14th, 2018|Categories: Audioholics|Tags: |

originally published: April 20, 2014

If you’ve ever glanced at the specifications sheet for an amplifier, one of the things you may have noticed is the amplifier’s class. Typically denoted by a letter or two, the most common amplifier classes used in consumer home audio today are Class A, A/B, D, G, and H. These classes aren’t simple grading systems, but descriptions of the amplifier’s topology, i.e. how they function at a core level. While each amplifier class comes with its own set of strengths and weaknesses, their job (and how end performance is judged) remains the same: to amplify the waveform sent to it by a preamplifier without introducing distortion, or at least as little as possible distortion.

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AC Wall Power Considerations for Your Home Theater System

By | August 23rd, 2018|Categories: Audioholics|Tags: |

 We often get asked how much AC wall power is needed to run a typical home theater system. There are lots of factors that determine this such as the number of AV components you have plugged into the same outlet and their associated power consumption, and whether or not that outlet is shared with other appliances or lighting on the same circuit. This article and related YouTube video discussion provides guidance on helping you decide whether you need dedicate outlets for your home theater to deliver 1.21 Gigawatts!… Read the full article

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Is the THX Standard Website Comparing AV Electronics Fairly?

By | May 7th, 2018|Categories: Audioholics|Tags: |

For years, the THX certification process was nebulous to the end user. What did their standards mean? 

When we attempted to pry information from them, they weren’t very forthcoming, claiming it to be IP (intellectual property). So, unless you were a licensing partner, you never really knew what was involved in their certification process and what specifications they used to govern them.

All of this seems to be changing since Razer acquired the company, as evidenced by the new THX Standard Website recently launched with this mission statement:

“With the launch of the THX Standard website, we give you data-driven comparisons of popular electronics to make informed purchase decisions unbiased by an editorial perspective.”

Their focus seems to “objectively” compare products for various categories, including HDTVs, Amplifiers, and Powered Speakers.… Read the full article

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My Favorite Home Theater Receivers of ALL Time

By | April 25th, 2018|Categories: Audioholics|Tags: |

Although I’ve been professionally reviewing AV gear since I started Audioholics way back in 1999, I’ve also been an audio enthusiast since my childhood. It is, after all, why I pursued a degree in electrical engineering and eventually left my profession designing audio communication systems for government defense to commit to this website.  Lately I’ve been reminiscing about my favorite AV receivers I’ve either owned, reviewed or had personal experiences with throughout the years. I’m not implying these are necessarily the best products of ALL time (though arguably a few on this list are), but they are nonetheless standout products that left a good impression on me.

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Power Manipulation in Dolby Atmos AV Receivers

By | October 12th, 2016|Categories: Audioholics|Tags: |

Are Power Claims being fudged with Atmos Receivers?

We’ve noticed a recent trend with the latest Dolby
Atmos/DTS:X AV Receiver releases.  Instead of publishing unclipped full
bandwidth power with at least two-channels driven into 8 ohm loads per FTC mandate, many
of the major AV receiver manufacturers are now touting power with only
one-channel driven, at 1kHz, into a 6 ohm load at up to 10% distortion.  This
type of testing scenario inflates the power rating up to 2X the former FTC way
of rating power into 8 ohm loads. 

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