CE Pro Debate: Should Immersive Audio Mean More Channels, More Amps?
The evolution of home theater now sees system configurations starting at 7.1.2 and peaking with as many as 32 discrete channels. Do all these channels mean it’s time to change overall amp designs to match these configurations?
Today, Atmos, along with competitor formats DTS:X and Auro-3D is thriving in the consumer electronics industry. Object-based surround (or immersive sound) has been so successful that price or the number of speakers are no longer barriers.
Integrators can assemble budget-friendly systems that are just as impressive as high-end expensive systems, and the content community is responding with UltraHD 4K discs with HDR to rival the quality of the best commercial cinemas.
Perhaps the only problem with the rapid adoption of immersive audio is the fact that amp manufacturers haven’t kept pace.
Sure, many of them offer home theater processors that incorporate as many as 32 channels and the latest in equalization (EQ) software, but where are the amps to support all these channels?
For comparison purposes, just about every A/V receiver company provides a choice of receivers with a minimum of 5.2.2 configuration capabilities to accommodate immersive audio.
Transitioning from receivers into separators can severely limit integrators and their approach to amplification.
Immersive Audio Drives the Need for More Amp Channels
With more homes gravitating towards system configurations that are at least 5.2.4, 7.2.2 or 7.2.4, the need for streamlined amplification is at an all-time high.
High-performance companies such as Bryston, Meridian, Lexicon, McIntosh offer amps ranging from five to seven channels. For object-based surround applications, that means a bigger financial commitment from consumers and a massive increase in rack space and weight to accommodate multiple amps.
Similarly, the commercial audio industry tends to top out at about four channels. These amps are just as powerful, more rack-friendly, and arguably more robust due to the critical applications in which they are deployed, but like the consumer products, integrators will need to use two or three amps to power advanced speaker configurations.
Another possibility is the use of whole-house audio amps.
There are some terrific products in this category, including AudioControl’s Architect Model 2660 and Director Model D4600, as well as Audio Design Associates’ (ADA) SAK-16150, and Lexicon’s DD-8+, but these products aren’t specifically engineered for the demands of a home theater.
Moreover, in some cases, integrators may have to use a second amp in large, advanced systems.
Asking Gary Dayton, vice president of sales for Bryston, Ltd., about the increasing need for more amp channels, he admits there is some pressure for a company like Bryston to develop amps with more channels, but he says Bryston will always favor performance over convenience.
“I think to some degree there is some pressure to do that, but with home theater installations there is always a spectrum of inexpensive and convenient products that pack as many features into a single box as possible,” he says.
“Examples include lower cost surround-sound receivers and then on the opposite end of the spectrum, there are very high performance. In exchange for that desire for very high performance, installers and customers have to accept more boxes, heavier products, and higher price tags.”
Dayton points out that Bryston has already begun work to meet the demands of more channels by introducing new products such as two asymmetrical amplifiers.
He explains the two new amps feature 1,000-watt and 600-watt monoblock channels, all the way down to 8 x 75-watt configurations.
“We got two new multichannel amplifiers that are asymmetrical in their ratings. One such model is the 24B, which features two 300 watt channels, plus four 75 watt channels so that lets you front load power ratings for your loudspeakers to maybe take advantage of larger loudspeakers or lower sensitivity speakers in the front while having extra channels available for surround and in-ceiling,” he notes.
“So as we put more channels into a box, we’ve got to add more power supply capabilities as well. At Bryston that means more weight. All of the amplifiers we currently manufacture are Class A/B—the vast majority we manufacture have fully independent power supplies for each channel, [and] independent transformers for each channel.”
Commenting on more cost-and rack-friendly amplifier technologies like switch-mode power supplies, Dayton adds that Bryston will never rule the technology out, but as it stands now, the company doesn’t feel those technologies perform well enough for Bryston to implement into its products.
Going forward, amplifier manufacturers will need to realize that they may lose sales to A/V receiver companies due to the cost and convenience those products provide.
A Case for Class D
A case could be made that if the Class D or switch-mode power supply amps are good enough for front-of-house (FOH) engineers in live settings across the world, they should be good enough for the less educated ears of homeowners.
Ultimately, it could be custom electronics professionals that decide the fate of amp companies in home theater environments.
There will be no issues if integrators specify separate components—multiple amps and home theater processors as immersive audio continues to grow, but if integrators (often through client pressure) decide the cost, convenience and ergonomics of A/V receivers are the best solutions for immersive audio then amp companies will have major problems.
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Bob is an audio enthusiast who has written about consumer electronics for various publications within Massachusetts before joining the staff of CE Pro in 2000. Bob is THX Level I certified, and he's also taken classes from the Imaging Science Foundation (ISF) and Home Acoustics Alliance (HAA). Bob also serves as the technology editor for CE Pro's sister publication Commercial Integrator. In addition, he's studied guitar and music theory at Sarrin Music Studios in Wakefield, Mass., and he also studies Kyokushin karate at 5 Dragons in Haverhill, Mass. Have a suggestion or a topic you want to read more about? Email Robert at firstname.lastname@example.org
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