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  1. ArnoFenn

    Avantgarde Horn Speakers

    Seems that the position of the mic could have caused the dip after 1k. What was the distance to the speakers (and height of the mic)?
  2. ArnoFenn

    Avantgarde Horn Speakers

    Try the 1/6 smoothing to get a better idea of the actual curve. At the listening position you can also do a measurement with 1/3 (and/or try 1/1) smoothing to see if you got a slope from low to high F going down 6-8dB.
  3. ArnoFenn

    Avantgarde Horn Speakers

    Shouldn't try to change that spectrum with an EQ I think. This is room/resononance timing data and controlling it usually is done by acoustic treatments of the room or in some cases of the loudspeaker housing if that causes a resonance somewhere. Measure this one with curtains open vs closed...
  4. ArnoFenn

    Field Coils for Audio Systems

    Any way you can do spl measurements?
  5. ArnoFenn

    Field Coils for Audio Systems

    where did you get them?
  6. ArnoFenn

    Field Coils for Audio Systems

    Very Impressive!
  7. ArnoFenn

    Measuring power line capacity with the IDEAL SureTest, and the effect of Shunyata power products

    Good point!
  8. ArnoFenn

    Isolation Transformer and Balanced Power versus PS Audio Regenerator

    This topic links very well with this one: https://www.whatsbestforum.com/threads/measuring-power-line-capacity-with-the-ideal-suretest-and-the-effect-of-shunyata-power-products.33201/#post-730372 And that package is what I have been working on/with for some time now. The Ideal meausurement is...
  9. ArnoFenn

    Isolation Transformer and Balanced Power versus PS Audio Regenerator

    I would say it is no exception. The voltage top often has got a flat top and the current is distorted by the many loads drawing their current in "their own way". The latter is behaving as a non ideal/resistive load.
  10. ArnoFenn

    Isolation Transformer and Balanced Power versus PS Audio Regenerator

    Switch the meter to the sine-waves of voltage and amp and you can understand the reasonable level of V THD and the huge A THD
  11. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    Also got that Fluke some time ago and you'll be surprised how much THD there can be on the current (while voltage THD seems reasonable). I did trials on filering out the 5th and 3rd harmonics and When listening to music there was a significant difference with/without, but my trial was a...
  12. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    That's not the issue. I do measurements like that and any EE does (Developed and built all my (pre)amps over many years). The links are meant as introduction. Anyhow, looking forward to more shunyata data (RCL if possible) ;-)
  13. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    It is basic indeed when you're in to electronics, but simply said, the capacitors in an amplifier keep up with supplying the current most of the time of the sine-wave, but since the capacitors are not perfect nor endlessly large in capacity, at a certain point they might run out of current...
  14. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    It is. Measuring power quality voltage/current signals in the main supply shows how current is being pulled by the many different "consuming" electronics which results in a very distorted total current (THD and often power factor affected drastically). Passive/active THD filtering on the mains...
  15. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    Even when there are no actual inductors or capaictors in the Shunyata...there can still be inductance and/or capacitance/resistance ;-)
  16. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    Was more thinking of RCL measurements on the Shunyata ;-)
  17. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    Would you also have a multimeter with a R, C and/or L measurement option?
  18. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    The filter might be functional outside the range of the meter. Also there should be an actual load connected to the output (the meter is rather a high impedance)
  19. ArnoFenn

    Measuring power line noise with the TriField EM100, and the impressive effect of Shyunyata products

    Great topic, something I have been looking forward to is to have more Shunyata measurement data. I would also be very curious what the RCL values are of a Denali/Everest unit. Eg. Input-output 1 line, resistive of inductive. Input between 2 lines, capacitance, Output shorted and measured RCL on...
  20. ArnoFenn

    Dedicated AC Line For Hi-Fi Setup

    Dedicated line, CB and IsoTrans works beautifully for me
  21. ArnoFenn

    What are the Pros and Cons of Using Output Transformers in a Tube Preamplifier Design?

    Low output impedance. I got them for this reason in my LCR based phono pre....and reduction of series caps.
  22. ArnoFenn

    SET amp owners thread

    Love your setup!
  23. ArnoFenn

    tell us about your goosebump tracks!

    Imelda: Cry me a River ;-)
  24. ArnoFenn

    Isolation Transformer and Balanced Power versus PS Audio Regenerator

    Update. Today a blind listening session for my wife (always wondered why it always has to go to the next extremes on audio improvement)..."..3D, mids/voices wider instead of "pinching"..." and that was with the isolation transformer. Differences were not small
  25. ArnoFenn

    Isolation Transformer and Balanced Power versus PS Audio Regenerator

    Had some days of listening trials with/without isolation transformer....and this is not a subtle difference I must say. Second thought was, did it get better or worse with the transformer. Listening to a double bass, without seemed better, but voices....500% for the transformer better. Now my...
  26. ArnoFenn

    SETs and Horns

    In my case, I calculate the horn, the the building, listening and fine-tuning. After that, design the SET. building it and fine-tune in combination with the horns (a lot of listening and measuring over the years)
  27. ArnoFenn

    SETs and Horns

    Indeed. Before it was a Lowther but then it was still a 1 speaker horn
  28. ArnoFenn

    SETs and Horns

    Yes, high efficiency and the level of the mid/high had to be attenuated to match the woofer/horn
  29. ArnoFenn

    SETs and Horns

    If there are more specific questions, do let me know, but to make a general start.. Yep, Fat Bob S as TT. The horns (DIY) 40Hz Tractrix profile, mid-horn TAF TD2001 driver and lazy ribbon as tweeter. SET's (DIY), 300B and interstage transformer coupling between drive tube and 300B tube. Tweeter...
  30. ArnoFenn

    SETs and Horns

    Some pics

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