Class D Receivers - AVS Forum
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post #1 of 18 Old 08-25-2010, 11:08 PM - Thread Starter
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The only reasonably priced one I seem to have found is the Samsung HW-C700. Are there any other sub-$500 (give or take) receivers out there with class D amplification?
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post #2 of 18 Old 08-25-2010, 11:27 PM
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I never understood why digital amplification fell out of favor. I remember a few years ago they were a big deal - TEAC had some and I had a Panasonic XR55 which was awesome, it was 1/3rd the size/weight and the sound was better than $1k receivers.

I'm interested in this topic too.
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post #3 of 18 Old 08-26-2010, 02:40 AM
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Only receivers I know of with class D are the Pioneer SC models.

"But this one goes up to 11"
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post #4 of 18 Old 08-26-2010, 04:32 AM
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Primare and Rotel as well !
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post #5 of 18 Old 08-27-2010, 08:26 AM
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Quote:
Originally Posted by Defcon View Post

I never understood why digital amplification fell out of favor.

I suspect the demise of Tripath had a lot to do with the fall of digital but perhaps the rise of the iPod is more the cause (there are few receivers currently on the market). Another issue is that many had a minimum 6 ohm output impedance (I've fried a few Tripath amps this way).

Despite the dearth of Class D receivers there are digital amps on the market (i.e. the Dayton DTA-100 with Tripath TK2050) at low cost with great sound but finding a 5.1 or better preamp could prove difficult. Alternately, there are plenty of used JVC digital receivers and on the rare occasion an XR55 or XR57 will show up.
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post #6 of 18 Old 08-27-2010, 09:23 AM
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There is a pretty nice Panasonic around still BX600 os something like that?
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post #7 of 18 Old 08-27-2010, 09:48 AM
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Originally Posted by JOHNnDENVER View Post

There is a pretty nice Panasonic around still BX600 os something like that?

Where can I find one of this panasonic one here in Denver?
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post #8 of 18 Old 08-27-2010, 09:54 AM
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Originally Posted by JOHNnDENVER View Post

There is a pretty nice Panasonic around still BX600 os something like that?

It's the SA-BX500. It isn't class D and it has been quietly dis-introduced from the market (not a stellar product).

Try the Sherwood R-903 (http://www.sherwoodusa.com/).
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post #9 of 18 Old 08-27-2010, 12:09 PM
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The Sherwood R-904n NetBoxx is a class D receiver.

Jeff
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post #10 of 18 Old 08-27-2010, 03:37 PM
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corey340:

The Sherwood R-903 is discontinued.

Jeff
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post #11 of 18 Old 08-27-2010, 04:43 PM
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Quote:
Originally Posted by Stereojeff View Post

The Sherwood R-903 is discontinued.

The Yamaha RX-V765 is not class D (it hasn't been discontinued... yet) but it DOES have a full complement of preamp outputs (extremely rare at it's price point) so external power amps (class D, H or Tube anyone?) can be added without having to trash your investment or lose the use of the remote (hopefully it's a good sounding preamp... i don't know).
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post #12 of 18 Old 08-27-2010, 05:04 PM
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Quote:
Originally Posted by corey340 View Post

The Yamaha RX-V765 is not class D (it hasn't been discontinued... yet) but it DOES have a full complement of preamp outputs (extremely rare at it's price point) so external power amps (class D, H or Tube anyone?) can be added without having to trash your investment or lose the use of the remote (hopefully it's a good sounding preamp... i don't know).

I got the 765 for the gameroom and it is amazingly simple and sounds fine. Price was amazing. New egg...Not sure if it measures up for everything, but we love it. I don't plan on using the preouts as it is plenty loud for the kids films n games. My theater room has a Pio elite 94. I'm pretty sure the yammy is as good as the pio in the pre section but I'm too lazy to test. I really think people spending 7-800 for the new Denons and Onkyos with preouts should check out the 765.
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post #13 of 18 Old 08-28-2010, 09:45 PM
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Defcon -- Class D amplifiers are not Digital amplifiers (don't be misguided by the "D" classification). The Panasonic XR55 had Digital amps, but they were true Digital amps, not Class D. Class D amps use pulse-width-modulation (of an analog amplifier) to achieve very high efficiencies. They are not a Digital amp. They also have low distortion, if designed correctly.

Digital amps fell out of favor because, unless the output filter was designed right, they could output a lot of very high frequency noise to your speakers (which could, ultimately, damage your tweeters). The poorer quality ones also had a significant amount of distortion in the upper frequency ranges. The output filters also can consume a fair amount of power.

BTW, Tripath calls their "modified class D" amplifier a "Class T" amp. There is a fairly complete, but simplified, discussion of amplifiers in this wikipedia article: http://en.wikipedia.org/wiki/Electronic_amplifier.

- Claus {non-Santa model}
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post #14 of 18 Old 08-28-2010, 10:28 PM
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IMO, so called "digital" amps are still class D. They are sometimes referred to as digitally controlled class D.

The only major difference between digitally controlled class D and analog controlled class D is the process by which the PWM signal which switches the output devices is generated.

With analog controlled class D, a conventional analog signal is converted to PWM using a standard technique.

With digitally controlled class D a PCM signal is converted to PWM.

Digitally controlled class D, AKA "pure digital" amps are not inherently superior. There's plenty of info out there on their drawbacks.

That being said, the state of the art seems to be evolving.

"But this one goes up to 11"
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post #15 of 18 Old 08-29-2010, 04:26 AM
 
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Quote:
Originally Posted by corey340 View Post

It's the SA-BX500. It isn't class D and it has been quietly dis-introduced from the market (not a stellar product).

Try the Sherwood R-903 (http://www.sherwoodusa.com/).

I think you are mistaken on this one .The Panasonic SA-BX500 is a class D digital receiver. I seriously doubt that you have owned this unit. It is an excellent product and has more power than the Panasonic XR-55 which is also class D.
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post #16 of 18 Old 09-10-2010, 10:59 AM
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Originally Posted by ruadmaa View Post

I think you are mistaken on this one .The Panasonic SA-BX500 is a class D digital receiver. I seriously doubt that you have owned this unit. It is an excellent product and has more power than the Panasonic XR-55 which is also class D.

Very much agree. I own one & the 11 lb wonder is pretty amazing. The only thing it is really lacking in is a more sophisticated Auto Setup function.
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post #17 of 18 Old 09-16-2010, 11:42 AM
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Quote:
Originally Posted by CT_Wiebe View Post

Defcon ...

Digital amps fell out of favor because, unless the output filter was designed right, they could output a lot of very high frequency noise to your speakers (which could, ultimately, damage your tweeters). The poorer quality ones also had a significant amount of distortion in the upper frequency ranges. The output filters also can consume a fair amount of power.

....

I really doubt this is why they fell out of favor -- there have been and even still are plenty of badly designed AB amps.

The main reason, IMO, is that it's harder for the manufacturers to maintain high margins with them, with a straight face, at lest.

Marketing still pushes heft and esoteric components as necessary for quality, and the flunkies at the A/V publications do their bidding by "hearing" the "superior presence" of the 80lbs boxes made by their major advertisers.

I went from a Class A Pass Aleph to a Panasonic XR57, and my Gallo Solos have been just as happy and sound just as good I am not going back to a big box.
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post #18 of 18 Old 09-16-2010, 12:20 PM
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Have they fallen out of favor? Pioneer seems to be selling SC models. They have been making them for a few years, anyway. Which suggests some success.

"But this one goes up to 11"
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