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Thread: BatPure 'Super-Tweeters'

  1. #11
    Join Date: Feb 2013

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    Quote Originally Posted by walpurgis View Post
    Is there a misconception here? It's not the audible output from the supertweeter that is listened to, it's the effect it has on the overall sound. I can hear whether a supertweeter is in circuit or not and I'm 70. I've experimented with many supertweeters rolling in correctly above the output from the main tweeter and can always hear their effect.
    yup, you feel it, and it can have, or appears to have an effect on bass too. no idea why, but guessing its via skin
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  2. #12
    Join Date: Apr 2012

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    I'm Geoff.

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    Quote Originally Posted by hifi_dave View Post
    Exactly.

    Do you need to spend large amounts on a Super Tweeter ?
    Dunno. Some are very expensive.

    I've used many different tweeters for this, but my favourite was the Celestion HF2000, which worked very well. Better even than Decca ribbons.

  3. #13
    Join Date: Mar 2010

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    I'm Simon.

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    The output of the supertweeter could be modulating the air from the other drivers, much more likely however that it's effects as a parallel filter to the rest of the xo is what we actually hear.
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  4. #14
    Join Date: Jun 2015

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    Quote Originally Posted by CageyH View Post
    You are missing the point.
    Super tweeters operate above 20KHz, so with a low cut off level why would you see if they do anything on a graph? It is like trying to measure absolute zero with a thermometer that only goes to 0 degrees Celsius.
    Ah I was referring to the overlay below 20khz, I thought you meant the difference was due to the range in the spec. I wasn't looking at the chart over 20khz, although I don't think the mic would become wildly inaccurate at 21khz, they probably didn't quote the range there as they didn't think anyone would want to use it that high being ostensibly "inaudible".

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  5. #15
    Join Date: Mar 2016

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    I have some super tweeters in the system at the moment and can’t put my finger on what they do..
    They do seem to give something to the overall presentation, but I can’t articulate what that actually is..
    I’ve taken them out (covered up with cushions) and I keep going back to having them in.
    I know Paul coupe who designed my speakers and crossovers wouldn’t advise having them in, which begs the question, are they actually messing the balance up? But I quite like them. Hmmm
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  6. #16
    Join Date: Mar 2010

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    1. What's the roll-off of the supertweeters? Is the bottom end in the audible range?
    2. What's the max power handling of the super tweeters?
    3. What sort of electrical load do they present?

    Chances are with most of them the bottom end overlaps well below 20khz. The Batpures AIUI don't they're just 20khz+, they have measly output power, not enough to modulate anything, so maybe it's the load they provide that causes any effect that may exist with them. They certainly don't operate up high enough for you to feel it on your skin A'la radio frequencies.
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  7. #17
    Join Date: Apr 2012

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    1/ The bottom end of a supertweeter's output should be above audiblity in most cases if implemented properly. Using one above a Celestion HF1300 tweeter's output is an exception, as the HF1300 cuts off very steeply at its top at around 13.5 kHz and many people would hear the lower output from a supertweeter used here.

    2/ Depends on the power rating of the supertweeter, but it doesn't need to be much, as the energy at higher frequencies is lower.

    3/ Depends on the impedance of the supertweeter, but used in parallel as normal most would not cause a problem load.

  8. #18
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    I've bought these off Steve at Electric Beach, liked the look of the grilles, now I just need to find a couple of boxes to put them in. Any ideas? I imagine some of those small Indian jewellery boxes look nice and are relatively cheap. Preferably without all that applied metal decoration.

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  9. #19
    Join Date: Mar 2009

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    I played about with some radio shack / tandy super tweeters, first order 6db crossover, and despite changing the cap to 1uf they were working down to at least 5k. (REW & calibrated mic)

    I have had them out of system for ages now but have just ordered some .33uf caps to see if I can push the crossover point up higher, the goal being to sense a difference without actually hearing one.

    A steeper crossover is of course another option.

    Interestingly I have also been looking at target frequency response curves, which sort of questions if we actually need super tweeters or indeed anything much above 15kz

  10. #20
    Join Date: Apr 2012

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    Quote Originally Posted by Mr.Ian View Post
    I played about with some radio shack / tandy super tweeters, first order 6db crossover, and despite changing the cap to 1uf they were working down to at least 5k.
    I'm not surprised. 1uF is too big with an 8 ohm unit. I experiment with values depending on which tweeter is being used and generally end up with capacitors of around 0.22 uF to 0.1 uF.

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