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Bob Carver has built new Amazing Line Source Speakers~

Discussion in 'Speakers' started by TNRabbit, Aug 31, 2011.

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  1. TNRabbit

    TNRabbit TN boy languishing in MD

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    Here's the latest on the new line source speakers Bob Carver & James Sauter have been working on. Will be marketed under Bob Carver LLC:


    This speaker will produce 121 dB SPL without distortion. Power handling is 2,000 watts rms without distortion. Sensitivity is 96 dB SPL @ 2.83 volts rms. It uses four vacuum tubes, four for the active crossover. There are three modes. Active crossover mode which requires two amplifiers for each speaker. Passive crossover mode which requires one amplifier for each speaker. Either mode may be used with or without a separate sub-woofer, yielding the third mode. It does not need a sub-woofer because it has so many drivers that the total air displacement is vast. All it needs is low frequency equalization for the woofers to make the system flat. That job is performed in the crossover box that comes with the speakers. The crossover box has the following controls: Low frequency Q, upper midrange level, high frequency level, and two switches used to set the system up mode-wise. It is very easy to use.

    The imaging and tonal characteristics are similar to my Cinema Ribbons, the differences being that these speakers possess a majesty, a bigness, and a sound with sonic and emotional envelopment that normal speakers cannot. They are the best speakers I ever designed. Les Williams said they may well be the best speakers EVER! All based on the work so far.

    Bob


    These are the prototypes. Minor adjustments left, but they are 75% done--

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    The last pic above is the builder, James Sauter (Toy Maker on carveraudio) & The BobFather.

    The stands are temporary; they will actually have feet something like this:

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    This is a shot in a mock-up plywood. Final will be extruded aluminum.

    [​IMG]

    This is funny: a shot of the passive crossover components that were swapped out during test/voicing:

    [​IMG]
     

     

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  2. SleeperSupra

    SleeperSupra Super Member

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  3. mhardy6647

    mhardy6647 AK Subscriber Subscriber

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    Be interesting to A/B them with Pipedreams; AKer Beemer has a pair of the latter; among the very best reproduced sound I've ever heard (with top-class program material, at any rate).

    -- and I am not generally a big fan of line arrays --

    Folks at another forum we know would be apoplectic to see the clip leads...
     
  4. Tom Brennan

    Tom Brennan AK Member Subscriber

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    Those drivers look like the planar tweeters from Parts Express, not that it need be a bad thing. I wonder.

    I am skeptical of the claim of 121db "without distortion".
     
  5. Bucky Badger

    Bucky Badger AK Subscriber Subscriber

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    Cool speakers and good pics. Love the clip leads.
    Way to go Bob and James.
     
  6. js1138

    js1138 Super Member

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    Expensive speaker wire...
     

     

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  7. bowtie427ss

    bowtie427ss arigato gozaimashita Subscriber

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    :yes: and a bit disappointed.

    As far as i'm concerned statements like that destroy the credibility of any further claims made regarding those speakers.
     
  8. jwalker

    jwalker Well-Known Member

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    I'm sure there's some hyperbole in that statement. Most people understand that there's no such thing as a distortionless audio system.
     
  9. Arkay

    Arkay Lunatic Member

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    They might well be without AUDIBLE distortion...

    Line arrays have many sonic advantages, when done right. These could be great speakers... I look forward to one day seeing and hearing them "in the fles-, uh, aluminum!"
     
  10. frankxbe

    frankxbe Super Member

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    Last edited: Aug 31, 2011
  11. bowtie427ss

    bowtie427ss arigato gozaimashita Subscriber

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    You and i are aware of the hyperbole, but indeed "most" people understand statements about performance made by "professionals" of Bob Carver's ilk to be truthful and factually supported.

    I don't know how broadly published that statement will be, but it is sure to be the source of some debate and conjecture.

    FWIW i have a good deal of respect for Mr Carver, and i'm confident that he knows there's no such thing as a distortionless speaker. But many folks will draw a different conclusion upon reading statements like that from well respected sources.
     

     

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  12. js1138

    js1138 Super Member

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    I'd bet that what is meant is there is no sharp rise in distortion before that level.
     
  13. js1138

    js1138 Super Member

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  14. stereocuuple

    stereocuuple Two Channel Only Subscriber

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    121 db no distortion :scratch2: = hearing loss :tears:
     
  15. mhardy6647

    mhardy6647 AK Subscriber Subscriber

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    ...which ain't bad until you figure the gross margin for a system mfgr. in.
     
  16. dumptruck

    dumptruck Lunatic Member

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    "Without a significant rise in distortion" is how I read that :scratch2:. It does look like the PE planar tweeter. With so little midrange being directly radiated, I can't help but be skeptical.
     

     

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  17. whoaru99

    whoaru99 Epic Member

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    Yes, in some regards.

    However, distortion spec of speakers is very seldom mentioned in product literature; people would be shocked by the numbers considering the discusiion of the difference between (for example) 0.5% and 0.05% or 0.005% is not unusual to see for electronics.
     
    Last edited: Aug 31, 2011
  18. bowtie427ss

    bowtie427ss arigato gozaimashita Subscriber

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    Not if we're going into production and solicit unit pricing direct from the manufacturer, and i cannot imagine sourcing parts for any scale of production any other way.

    When you purchase by the thousand lot, prices reduce, sometimes dramatically.

    The cabinet proper appears to be an aluminum extrusion. These "might" make it to market at a bit lower msrp than one might first expect. Much will depend on the scale with which they choose to produce them.

    Polar plots and other graphically displayed analysis would be interesting and make for some useful comparison.
     
  19. TNRabbit

    TNRabbit TN boy languishing in MD

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    An MSRP of $8k has been tossed around....

    Also, the parts express ribbons are nowhere close to the power handling of these ribbons. They are the same ones used in Sunfire's Cinema Ribbon speakers.
     
  20. jwalker

    jwalker Well-Known Member

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    I would say in ALL regards. Distortion in electronics and electro mechanical systems is a certainty. It may be vanishingly low but it's there.
     
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