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Differences between SVS Ultra and Plus drivers

Discussion in 'Subwoofers' started by Ian J, Sep 28, 2004.

  1. Ian J

    Ian J
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    I came across a post by Tom V in a forum over the pond and I thought I would copy and paste it here as it is an interesting explanation of the differences between the two drivers and confirms my own thoughts that there are very few differences at normal listening levels but the differences show when you start to push them.

     
  2. Andywilliams

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    Hi Ian
    Tom did reply to my email a while back when i asked him if it would be worth upgrading to the pcu from my pc+ and he said it wouldnt really as i wouldnt notice any audible difference unless playing at very high volume in a large room,Still i do dream of the day i can have a plasma which will then leave me room for a pb ultra,going to florida next march seems to have used next years budget up KIDS :laugh: .
    Cheers Gonzo.
     
  3. Jeff

    Jeff
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    I've listened to a PCi and a PC ultra in my very small room at low volumes and I think Tom is mistaken to say they sound the same. They have a similar sound, but the Ultra is much better IMO. Many people who have upgraded to Ultra drivers agree with me.
     
  4. Smurfin

    Smurfin
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    I agree there...the Ultra has a different sound, though my opinion is skewed as I haven't listened to them both in the same room.
     
  5. funkmonkey

    funkmonkey
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    The Ultra driver does look very beefy indeed.

    Has a superb 'I'm over-engineered' look to it.

    Reminds of the insane drivers that SPL freaks use in ICE installations - which is a good think in terms of distortion and SPL's :)
     
  6. Nimby

    Nimby
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    I'd value some opinions on how the larger 16-46 enclosure and single 4" port would suit the Ultra driver. :)

    In the 16Hz tune I feel the Ultra drive unit is being strangled by the smaller port area. As only one of the three reflex ports is then available. This is indicated by the lower maximum SPLs. So the 16Hz tune must surely be a slight compromise. At the higher frequency tunings the Ultra in its 20-39 enclosure must be able to breathe more easily through the greater cross sectional area of the two (and three) open ports. This is indicated by the increased output. But at slightly higher frequncies.

    My feeling is that (perhaps with some adjustment to length for tuning) the single 4" (16-46) port would allow the greater volume of the 16-46 to achieve higher maximum SPLs from the Ultra driver but still retain the very low 16Hz tune.

    Of course we can only guess at the TS parameters for the Ultra driver. Unless someone with experience in these matters would care to run some 'guesstimate' numbers past us? :smashin:

    It's all guesswork on my part of course. But I find it interesting that while a 16-46 Plus is available no 46" version is offered in the Ultra spec.

    Nimby
     

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  7. Ian J

    Ian J
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    Perhaps it's done to keep down the number of models being manufactured and if the purchases made last year by forum members were representative the 39" model outsold the others by ten to one.

    There is one person who undoubtably knows the answer so email Tom and ask him
     
  8. Nimby

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    I can't see how pre-sized tubular enclosures in the PCi and Plus ranges couldn't easily become Ultra fodder. They are already in the same factory ready for assembly. :cool:

    Asking Tom would be cheating Ian. :D

    It's much more fun to speculate about these things. :)

    Nimby
     
  9. Ettepet

    Ettepet
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    Here you can find an imo better explanation of the difference between these drivers, by Ed Mullen (and quotes from Tom V.):

    On a side-note: The fact that the voice coil of the Ultra is "underhung" could mean it should be mounted horizontally for it to work at its best, making the B4-Ultra a less-ideal option. (the B4 design has all 4 drivers mounted vertically) From what I heard Tom, after the spectacular designing succes of the B4+ tried to use the Ultra-drivers, but found it wasn't worth offering the option.
     
  10. Smurfin

    Smurfin
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    Well you learn something new every day:) Good post ettepet:)
     
  11. Ettepet

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    Thanks, Smurfin! ;)
     
  12. Nimby

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    I don't believe an underhung voice coil knows whether its drive unit is horizontally or vertically mounted. :)

    It just means that the coil is shorter than the magnetic field. The idea being to keep the magnetic motor effect as even as possible over the complete cone excursion. :)

    If the coil was the same length as the magnetic gap. Then some part of it would pass right out of the magnetic field at the limits of cone excursion. Leaving the coil (and attached cone) unable to be driven (or controlled) with the same power at all points on its travel. :oops:

    An overhung coil is much longer than the magnetic field. The idea here is that at least some part of the coil never leaves the magnetic field. So again the electromagnetic power to drive and control the cone. Remains the same throughout the cone's complete excursion. :)


    Regards
    Nimby
     

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  13. Ettepet

    Ettepet
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    Well you learn something new every day! ;)
     
  14. Daneel

    Daneel
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    I'm believe custom versions may be possible. A guy was asking about a 16-48 with Ultra driver and it went to email without giving anything away.

    All of the above info looks like it was copied from posts on HTF. That forum has a wealth of information about SVS.

    A picture is worth a 1000 words as they say, I linked to the thread on HTS some time back showing the old ultra driver (pretty close to the current plus driver) next to the new Ultra driver. The old ultra was dwarfed and looked decidedly wimpy.
     
  15. Nimby

    Nimby
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    I think you must mean this picture! :D
    Borrowed temporarily from the SVS forum HTSpot sticky. :blush:

    Nimby
     

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  16. Nimby

    Nimby
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    An interesting comparison between the SVS Ultra and this 1929 B&O cinema speaker. :devil:

    Nimby
     

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  17. Smurfin

    Smurfin
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    [​IMG]

    And that, people, is where the extra cost is going :devil:

    That is a SERIOUS driver....
     
  18. Daneel

    Daneel
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    Way to link the same picture Nimby did on the last page Matt. :p
     

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