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MVK

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  1. Item Condition: Very Good - Excellent
    Shipping Options: Pickup available but audition is not available.
    Suburb or Town: Bondi Junction
    State: NSW
    Payment Method: EFT or Cash on Pickup
    Reason for selling: I no longer have the space for these speakers; apartment living

    A pair of VAF Speakers I93; Mk1 in Australian Jarrah

    The cabinet is in very good - excellent condition 9/10.

    There are no significant scratches, stains or marks on the Australian Jarrah timber veneer. There are a few very minor marks on the black plinth speaker base, which have probably been caused by the head of the vacuum cleaner (refer to photos).

     

    The speakers simply deserve a larger living area than I have available, which is apartment living.

    They have thus never been driven loudly, they have been enjoyed for their finesse and delicacy.

    If you’re reading this then you probably already know these speakers are considered to be exemplary; the Product Data Sheet is attached with all the detail, below is a summary:

    Specification.

    • Frequency Range 17Hz-21kHz (21Hz-19kHz +/- 1.2dB)
    • Phase Response +/- 5 degrees (100Hz-20kHz)
    • Sensitivity 89dB/W @ 1m (2.83V)
    • Nominal Impedance 3 Ohms
    • Recommended amplifier powers from 10-500W RMS
    • Dimensions (mm) 1575H x 270W x 491D
    • Weight 200kg per pair.

     

    The current I93 model (not this one) is a Mk3. Its RRP $14,750. Refer to link below.

    https://vaf.com.au/shop/ols/products/signature-i93mkiii/v/SGN-93M-PR-STR-JRR

     

    This speaker can be easily upgraded to the current Mk3 version since the differences between the Mk1 and Mk3 is a change in tweeter, crossover and external felt treatment. The cabinets and other drivers are essentially the same. With the upgrade you could consider these as a half price Mk3.

    Contact VAF Research for further details.

     

    Shipping

    The speakers were originally delivered by 'Cope Sensitive Freight'. I don’t have the original crates that the speakers were delivered in so this will have to be picked up locally.

     

    Lets have a look at what you are buying?

    The I-93 is a large floor standing 5 driver, 3 way speaker.

    The drivers are supplied from Norwegian company SEAS; EXCEL range. It contains 2 x 210mm Hard Paper bass drivers with solid copper phase plugs, 2 x 130mm Magnesium cone midrange drivers also with solid copper phase plugs and a 25mm Double Chamber Sonotex Dome tweeter with a pure silver wire voice coil.

    Each bass and midrange driver also features solid copper induction rings both in front and behind their forward magnetic pole plates. This ensures a dramatically more consistent electrical load resulting in far lower distortion.

    The drivers are mounted at the appropriate depth in the cabinet, tweeter is the deepest in the cabinet while the woofers are mounted on the surface of the cabinet so that voice coils across the 5 drivers are in time alignment.

    Natural fibre pads are fitted to the front baffle surrounding the tweeter and midrange units to accurately control dispersion to minimise diffraction effects.

    Electrical crossovers are constructed from 1% tolerance resin bound air cored inductors, close tolerance metallised polypropylene capacitors and non-inductive close tolerance resistors.

    Tri-wire, tri-amp or bi-wire, bi-amp; input capability.

    The substantially braced cabinets are manufactured from first grade MDF up to 52mm thick with fully mitred construction.

     

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    • Like 5
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  2. G'Day.

    This is my first posting; trust you find it interesting.

     

    I have downloaded Room Eq Wizard to see what I could learn from measuring the output from a pair of Concept 20's.

    By the way, pretty impressive software.

     

    I took 4 measurements.

    All measurements were on axis with the tweeter at a distance of ~70cm from the tweeter.

    What interests me is the difference between the measurements and not the absolute value of the individual measurements as this obviously wasn't measured in a lab, but the relative differences are interesting. 

     

    1. Speaker measured as is.

    The frequency response is good; wood perfectly match a sub.

    The tweeter appears to be "out of phase" for a significant portion of its operating range.  

    image.png.347e5ee2c35f4f392b41609db29336e7.png 

     

    2. Speaker measured with whole speaker "out of phase".

    The frequency response appears to be the same, as expected.

    The tweeter now appears to be "in phase", but the woofer not so.

    image.png.6dd5e8082b625e18474d6a234d32b93d.png

     

    3. Speaker measured with the tweeter only out of phase. This is easily done as there are 4 speaker binding posts.

    As expected the frequency response is impacted particularly around the crossover area.

    The phase response was excellent above the crossover area, but obviously a mess around the crossover area.

    image.png.d918ba41a2ea2a45599d6df024e2e302.png

     

    4. Crossover removed and replaced with a digital 4th order LR crossover.

    The frequency response is very similar to the first 3 measurements.

    The phase response was intriguing. The woofer is somewhat similar to the original crossover but now the tweeter is also in phase across much of its operating range.

     

    image.png.1852552b50b995d712ea254cc8b13fc7.png

     

    There is such a knowledgeable community out there so here are a few questions that I am keen to get answers to and particularly the reasoning behind the answers.

     

    Questions?

    Which of the above "phase responses" is the best response?

    Are any of the responses ideal?

    What should be the ideal response?

     

    Thanks in advance.

  3.  

    I have downloaded Room Eq Wizard to see what I could learn from measuring the output from a pair of Concept 20's.

    Pretty impressive software.

     

    I took 4 measurements.

    All measurements were on axis with the tweeter at a distance of 70cm from the tweeter.

    What interests me is the difference between the measurements and not the absolute value of the individual measurements as this obviously wasn't measured in a lab, but the relative differences are interesting. 

     

    1. Speaker measured as is.

    The frequency response is good; wood perfectly match a sub.

    The tweeter appears to be "out of phase" for a significant portion of its operating range.  

    image.png.347e5ee2c35f4f392b41609db29336e7.png 

     

    2. Speaker measured with whole speaker "out of phase".

    The frequency response appears to be the same, as expected.

    The tweeter now appears to be "in phase", but the woofer not so.

    image.png.6dd5e8082b625e18474d6a234d32b93d.png

     

    3. Speaker measured with the tweeter only out of phase. This is easily done as there are 4 binding posts.

    As expected the frequency response is impacted particularly around the crossover area.

    The phase response was excellent above the crossover area, but obviously a mess around the crossover area.

    image.png.d918ba41a2ea2a45599d6df024e2e302.png

     

    4. Crossover removed and replaced with a digital 4th order LR crossover.

    The frequency response basically reverts back to the original frequency response; it might be a little flatter now.

    The phase response was intriguing. The woofer is somewhat similar to the original crossover but now the tweeter is also in phase across much of its operating range.

     

    image.png.1852552b50b995d712ea254cc8b13fc7.png

     

    Questions?

    Which of the above is the best "phase" response and why?

     

     

     

     

     

  4. I love music and if i cant hear it live then what is the best reproduction possible?

    Speakers. Should we aim for crossover-less speakers so that the signal is kept pure? I have seen speakers with just a capacitor in the signal path on the tweeter and no components in the signal path on the bass driver. What are the compromises?

    Amplifiers. Should we aim for minimum components in the signal path? Valve amplification appears to achieve this but then what are the compromises? 

    The world of Hi Fi; fascinating.

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