Krell Introduces new iBias Class A Amplifier Line Preview

Discussion in 'Amps, Pre-Pros & Receivers' started by admin, Jan 16, 2014.

  1. admin Audioholics Robot Staff Member

    admin
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    Krell announced their new iBias technology to be integrated into their amplifier line at the CES 2014 show. iBias seeks to maintain the dynamics of the Class A design while reducing the size and heat often associated with Class A. The new line includes a monoblock, two stereo, and one each three, five, and seven channel offerings. Ranging from $7500 to $11,500 (price more closely tied to the watts per channel rather than the number of channels), these are actually pretty affordable for Krell offerings. The question is whether then fans will turn off too many potential consumers.
    [​IMG]

    Discuss "Krell Introduces new iBias Class A Amplifier Line Preview" here. Read the article.
  2. 3db Audioholic Overlord

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    Really??:eek: For that much money, it better have teh ability to serve me my cold beer on demand. :p
    3db,
  3. itschris Moderator

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    I don't know... the prices on the Krell (the toughest) seem to be in line with McIntosh (the classiest) and Jeff Rowland (sexiest).

    I keep reminding the wife that when I'm done at my current gig and we find and move to our final home... one of these three are going to be living with us.
  4. AcuDefTechGuy Audioholic Slumlord

    AcuDefTechGuy
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    I think if I were a billionaire, I would just get McIntosh monoblock amps.
  5. jinjuku Moderator

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    Sounds like Crowns Class I amplification.
  6. RichB Audioholic General

    RichB
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    From Krell:

    This feature popping is up popping in more amps: Parasound, ATI Signature, and now Krell.

    - Rich
  7. TLS Guy Audioholic Overlord

    TLS Guy
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    Pretty much all amps have been directed coupled, with no cap in the signal path since the early to mid seventies.

    As far as getting class A performance without the heat and unreliability, Peter Walker achieved that over forty years ago, and I have used his wonderful current dumping amps since and would use no others.

    This is all marketing BS from Krell.
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  8. gene Audioholics Master Chief Administrator

    gene
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    Agreed I don't know anyone one using caps in the signal path in amps anymore. In fact, when I was doing my senior level design project for my undergrad, my teacher made me design a level shifting circuit as he wouldn't allow me to use a blocking cap :)
    gene,
  9. TLS Guy Audioholic Overlord

    TLS Guy
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    When I see pure nonsense in the ad puffery, and a high price tag, I sense a wallet biopsy not in the customer's interest.

    From their description of the bias altering with load, it sounds like standard A/B biasing to me.

    If they have something new to offer then they should publish the circuit and the math for peer review. If it is different enough to get a patent they have nothing to fear, of they can't it doesn't matter.

    Peter published everything for peer review before going to market. His feed forward design was not a hole in one, that is why there are so many iterations of the 405 and 405-2. In those amps, the slew rate never was high enough to allow full power at the top end of the frequency spectrum. That had to do with stability issues. However as Peter pointed out, music does not require full power at the top end. If it did we would all be blowing tweeters. After the 405 series this issue was solved. However, later iterations of the 405-2 are excellent sounding amps.

    By the way, all his owners manuals contained a full circuits and voltage points. How things have changed!

    I have 3 KW of power here using current dumping amps, for less than the cost of the cheapest model of those "ibias" amps, whatever that is. If this is something new and in the customers interest, Krell need to step up the plate and let the designers explain and send the marketers home. Until then I have no faith in anything they have to say about these amps.
  10. ImcLoud Audioholic Ninja

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    I have to agree with you here, my dream system would be powered and processed by Mc labs
    picture a c1000 pre amp, 2 pair of mc2kw's, an mr88 tuner, mc10 table, mcd1100 cd player, mcp1500 power box, men 220 room correction,
    I don't know if anyone has seen the mc2kw's in person but its 3 pieces, 2 1000 watt blocks and another module with a huge gauge, its insane.... $70K each, what i listed above would cost around $350K before you buy cables and speakers... For speakers I would most definitely get a custom build, a master speaker builder would be hired for a year and get the room and speakers just rite!!!! and run a pair of 2kw amps to the speakers and a pair to the subs...
    [​IMG]
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  11. Irvrobinson Audioholic Ninja

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    Krell's strategy is not standard Class AB bias; they have been using predictive variable bias for many years. So have several other manufacturers, including Levinson.
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  12. Irvrobinson Audioholic Ninja

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    Not me. Needlessly putting output transformers in the signal path of a solid state amp represents questionable engineering. If money was no object there are better designs, IMO, like Pass Labs.

    Krell used to be my favorite, but after Dan D was forced out I've lost interest.
  13. ImcLoud Audioholic Ninja

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    pass labs has some really really nice stuff too, but them mc2kw, are just insane, shock and awe... 2000 watts like 380lbs{:p} just sick...
    Last edited: Jan 16, 2014
  14. gene Audioholics Master Chief Administrator

    gene
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    If money were no object, I'd choose Boulder Amps ;)
    gene,
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  15. fuzz092888 Audioholic Warlord

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    Actually it's more like 377lbs for all 3 units of the Mc 2kw. I've never been a huge fan of the auto former and I agree with Irv that engineering wise, there are probably "better" designs out there. Aesthetically I do really like the Mc, but performance wise I'd probably look elsewhere in this magical fantasy land where I could afford such things. :D
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  16. jinjuku Moderator

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    The funny part: Look ahead tracking like this is straight out of the Pro-Audio sound world. Check out Lab Gruppen. They have some very good technical articles on this. And this was before they acquired Lake Processing.
    Last edited: Jan 16, 2014
  17. fuzz092888 Audioholic Warlord

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    Now those are some amps.
  18. ImcLoud Audioholic Ninja

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    How about this baby, I seen these in NY, 100 watts pure class a like 200+ lbs.. fuzz can google it for the actual weight, since he is in the correcting mood, lol... these are only 20K$ each..[​IMG]
    Last edited: Jan 16, 2014
  19. Irvrobinson Audioholic Ninja

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    But not to my knowledge in the 1990's, when Krell started doing it. Their first implementation used three bias levels, complete with front panel LEDs to show you the bias level.
  20. ImcLoud Audioholic Ninja

    ImcLoud
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    I remember them saying they were over 600lbs, but they must have been talking about the pair, but I will believe 377, still really heavy, lol... when you stand in front of them they are quite impressive...

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