New Yamaha Integrated Amp/DAC

Irrenhaus
Irrenhaus Posts: 1,090
in Electronics
Looks interesting.

http://usa.yamaha.com/products/audio-visual/hifi-components/amps/a-u671/?mode=model

Cheers
HTAVR-Pioneer SC99XPA-DR3 Differential Reference AmpPolk R-700Rear- RT150Side- RT150Center-CSi5Sub-Rythmik audio F25Player- Panasonic DP-UB9000Projector- Optoma CinemaX P2Screen- Silver Ticket Products STR Series 6 120"Audio Room 2ch rig.Cary AE-3, Onkyo M-504, Marantz SA8005, Azur 851NWharfedale - Linton, SVS SB12-NSDMinis Forum PC (streamer) and Panamax MX5105Headphone rig;Schiit JOTUNHEIM and different headphones.Samsung 42" flat screen TV.
· Share on FacebookShare on Twitter

Comments

  • Conradicles
    Conradicles Posts: 6,081
    7 LBS?
    · Share on FacebookShare on Twitter
  • Conradicles
    Conradicles Posts: 6,081
    10% THD?
    · Share on FacebookShare on Twitter
  • F1nut
    F1nut Posts: 50,561
    edited January 2016
    It's a digital amp, hence the weight.

    The 10% is at maximum power, as in overdriven. The actual THD is 0.05 %.

    Yamaha has a CD/Network player, the CD-NT670 that matches that integrated, but for some really stupid reason is not making it available in North America. Both are available in every other world market and also available in silver in those markets. The pair together would make a nice bedroom or small apartment/dorm rig.

    Yamaha's marketing decisions boggle the mind.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

    · Share on FacebookShare on Twitter
  • cnh
    cnh Posts: 13,284
    edited January 2016
    I noticed that as well. Digital amps. But yeah, this "silver" thing is a little perplexing. What is it about the U.S. market and basic black? Even two tone looks better (silver and black). And D-amps usually hit that 10 percent distortion really fast at their clipping point. I have an old Panasonic AVR around here that is a D-amp x 6 channel that can put out a legitimate 70 watts or so into those 6 channels-I believe it is less than 10 lbs. Oh, and it is silver!
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
    · Share on FacebookShare on Twitter
  • mhardy6647
    mhardy6647 Posts: 33,804
    clipping is pretty much defined as the power output level at which THD climbs "without bound"... amplifier topology doesn't much matter (although vacuum tube circuits tend to compress as they transition to severe nonlinearity; sort of a kinder, gentler clipping profile).

    Here's an example from the output of a soiled state amplifier:

    pass-x1000.5-amplifier-thd-plus-n-vs-power.gif
    THD+N vs. Power indicates that the X1000.5 outputs 1,000 watts into 8 Ohms at clipping (1% THD+N). In this graph, the 1% mark is crossed at about 950 watts, but this was due to the wall AC voltage dropping significantlly with such high power demand. There is no question that this amplifier will output at spec.
    source: http://hometheaterhifi.com/reviews/amplifier/power-amplifier/pass-labs-x10005-monoblock-power-amplifier/

    OK, maybe not so typical :-P due to the demands on the AC mains near the power output at which the amplifier goes nonlinear, but still...

    · Share on FacebookShare on Twitter
  • cnh
    cnh Posts: 13,284
    edited January 2016
    I "really" have to stop speaking/writing in generalities and being so oral (lax toilet training, perhaps, or Narcissus and Goldman?). What I meant is this, albeit, loosely and sloppily implied above, but hey, what do you prefer, poetry or logical positivism? The Raven's Paradox anyone-darn philosophers of science-bored me for an entire semester. lol

    "Because they produce much less heat, Class D amplifiers can be housed in a much smaller chassis than a Class AB with the same power output. The downside is that the on-off switching of the transistors produces high levels of distortion, particularly in the middle and upper frequencies."

    Of course designing such amps tries to route these distortions to registers beyond human hearing, I believe, but then again, my copy of Engineering Digest did not arrive this month. And my wife and I both suspect that Alzheimers may be creeping toward us. How will WE ever know if we are BOTH so afflicted? OMG, we may have to give up scrabble, crossword puzzles (N.Y. Times, of course), Bridge and God knows what else! And to think, it is only the first of January?

    Of course I'm grumpy! I'm starting a new class on Monday. SNOW has arrived, temps have fallen, and the SADS is kicking in even though this is not quite Nordkapp . lol

    Post edited by cnh on
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
    · Share on FacebookShare on Twitter
  • mhardy6647
    mhardy6647 Posts: 33,804
    ... so does classical Class AB1 push-pull switching -- "crossover distortion" -- and it's the bane of PP amplifiers. Operating a push-pull amplifier in Class A minimizes or eliminates the crossover distortion, but it is much less electrically efficient per watt of power output (higher efficiency is one of the big selling points of push-pull Class AB biased amplification).


    fig_5_distortion_spectrum-class_a_vs_class_b.png

    Nice comparison of class A vs. class B (the 'extreme' form of high-efficiency push pull operation, in class B the "pull" output device is completely "turned off" when the "push" device is operating, and vice versa). This is from good ol' Nelson Pass..

    Source: https://passlabs.com/articles/audio-distortion-and-feedback

    I believe that the noise created by "class D" amplifiers is spectrally quite different, though. There is lots of ultrasonic noise, which has to be dealt with via filters; here's a nice quantitative assessment of the noise and distortion components of a Class D amp from good ol' Stereophile:

    http://www.stereophile.com/content/rogue-audio-sphinx-integrated-amplifier-measurements#pctvkv8wcfHLWmUL.97

    JA references the ultrasonic noise component riding on a 10 kHz square wave, illustrated in the above reference's Figure 2:


    814rogue.Roguefig02.jpg




    Who cares? Well (I'd opine)... a little bit of knowledge of the basics of amplification and sound reproduction, besides (I think) being fascinating will help stave off any temptation to buy into some of the weirder, wackier claims of the audiophile tweaker industry (I'll refrain from mentioning specific, egregious examples) ;- )


    · Share on FacebookShare on Twitter
  • cnh
    cnh Posts: 13,284
    mhardy6647 wrote: »


    Who cares? Well (I'd opine)... a little bit of knowledge of the basics of amplification and sound reproduction, besides (I think) being fascinating will help stave off any temptation to buy into some of the weirder, wackier claims of the audiophile tweaker industry (I'll refrain from mentioning specific, egregious examples) ;- )


    Can't disagree with that. But really, Mark? A "little" knowledge, methinks you're being too modest.
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
    · Share on FacebookShare on Twitter
  • mhardy6647
    mhardy6647 Posts: 33,804
    anyone who really knows about this stuff can easily see how little I do.

    That said, I am trying to encourage others here not to be afraid to peek behind the curtain a little and see what makes this stuff tick. It's very enabling, I opine.
    · Share on FacebookShare on Twitter
  • Nightfall
    Nightfall Posts: 10,086
    I'd opine its time for you to come up with other ways to say opine. ;)
    afterburnt wrote: »
    They didn't speak a word of English, they were from South Carolina.

    Village Idiot of Club Polk
    · Share on FacebookShare on Twitter
  • F1nut
    F1nut Posts: 50,561
    mhardy6647 wrote: »
    It's very enabling, I opine.

    I'm offended.....

    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

    · Share on FacebookShare on Twitter
  • mhardy6647
    mhardy6647 Posts: 33,804
    well, I kinda cotton to "I reckon", too, but I reckon that perhaps that's a little too Jed Clampett for a snazzy joint like this...

    lady-gaga-jed-clampett-1.jpg
    · Share on FacebookShare on Twitter
  • F1nut
    F1nut Posts: 50,561
    Now, you're talking!
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

    · Share on FacebookShare on Twitter
  • mhardy6647
    mhardy6647 Posts: 33,804
    edited January 2016
    well doggies!
    · Share on FacebookShare on Twitter
  • mhardy6647
    mhardy6647 Posts: 33,804
    edited January 2016
    Oh... on topic (well, cl[oser, any way)... I had an e-mail from Yamaha today extolling their (integrated) amplifier history :- ) Here's the link that the e-mail included; some of you may enjoy a quick look at this.
    http://usa.yamaha.com/products/audio-visual/hifi-components/hifi-history/integrated-amplifier/?utm_source=CEG&utm_medium=email&utm_campaign=CSM9191_AV35


    amp_integrated_top.jpg

    · Share on FacebookShare on Twitter