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  1. K

    ESL performance and ambient conditions

    I remember talking to Roger West about this some years ago some of his customers in tropical areas of Asia (Singapore for example), The issue had to do with the materials used to insulate the stators, he changed the material to deal with the issue. He hadn't seen the issue where he lived (Utah)...
  2. K

    Amplifier Design Roundtable article / TAS issue 223

    If you get the ones withthe chip amp E Geddes measured you will have a very nice amp with the right sort of load IOW no real low impedance with low efficenacy. Virtually no high order harmonic distortion , distortion that decreased in a linear fashion as volume is decreased and almost no zero...
  3. K

    Pass Labs XP-30 preamp?

    NP confirmed that he is not using the SIT devices in the XS amps due to limitations of the power handling of those devices, he saif he is using somethiong different "tailored to get some of the same effects".
  4. K

    Pass Labs XP-30 preamp?

    Wasn't the six moons review of the First Watt SIT amp prior to the XS being shown at CES this year?
  5. K

    Pass Labs XP-30 preamp?

    Wasn't the six moons review of the First Watt SIT amp prior to the XS being shown at CES this year?
  6. K

    Pass Labs XP-30 preamp?

    They allude to examining different types of Output devices, and NP went to the trouble of having these devices made up. I will check into it and verify.
  7. K

    Pass Labs XP-30 preamp?

    THe XS is using these SIT device, hence the price of the amps. I believe the First Watt amps using the SIT's are only using 1 per ch. The XS is a different kettle of fish. First Watt (IMO) is N Pass's place to try out different topologies in low power formats. The design's has been released to...
  8. K

    Pass Labs XP-30 preamp?

    I havn't heard the amp. However I have followed the story of the amp over at DiyAudio. Nelson started using Power Fets from a company called SemiSouth. These are different critters than the typical MosFets, they are more of a power version of the Fets he uses in his pre amps. He worked with...
  9. K

    Sampling Rates and Music Quality

    DonH50 & Lee thanks for the info. Lee which of the Izotope products are you guys playing with?
  10. K

    Sampling Rates and Music Quality

    Question are there algorithms that allow say a 44.1 16 bit file to be up sampled to a 88.2 24 bit for example? Would the quality of the resulting D/A conversion be improved? This would allow streaming audio from sources like Pandora or other internet raido sources with their huge libraries...
  11. K

    After 30 years the battle of the formats rages on

    The only format wars for music are various loss/lossless formats and CD. Everything else is a niche. The controlling factor for most is access to the greatest variety of content. I do a lot of listening to youtube over headphones. There are a lot of performances available that I had never come...
  12. K

    Anyone miss tube TVs?

    I remember going to the drug store during the 50's they had a tube testing machine and he would test the tubes and get new tubes at the store to repair the TV when the old tube went out. Most of the tubes used in audio equipment today were designed to be used with tv's and not for audio use.
  13. K

    Perception, science, engineering and high-end audio

    This is the Geddes approach run the mains full range and use the subs below the Schrodinger freq for the room to control room modes.
  14. K

    Perception, science, engineering and high-end audio

    I agree with you take since I don't listen to organ music I am not worried about going below 30hz. I bought 3 of the Polk's for my daufhter's HT system and set them up as per Earl's recommendations they worked quite will in giving a good bass performance fo the room. I think Geddes larger...
  15. K

    Perception, science, engineering and high-end audio

    Geddes actually mentioned the polk subs the point being that the 3 subs in a small room will be better thant 1 say 2k sub in optimizing the bass response in a small room. Of course if you went to say 2 rhythmic subs it would provide a lower response. The point of the post was the ability to...
  16. K

    Perception, science, engineering and high-end audio

    Haven't heard it, wish I had. Keele has a pdf woth measurement vs B&W 801 Series 3: http://audioartistry.com/brochures/B&W%20801%20vs.%20CBT36%20Ground-Plane%20Measurements%20v8.1.pdf Rick Craig is building a CBT using the Raal Ribbons: http://www.selahaudio.com/id279.html
  17. K

    Perception, science, engineering and high-end audio

    Kit abailable for the Keele design for 2k http://www.parts-express.com/pe/showdetl.cfm?Partnumber=301-980
  18. K

    Perception, science, engineering and high-end audio

    You could build system that could drive that sort of room for maybe half of that. PC based server w/Burwen Bobcat software (program source and program eq software) ~1.5k Gedlee Abbey Kits ~3.6k Ncore mono amp kits ~1.5k Deqx express ~2k 3 Polk powered SW ~ .7k ~6k room treatment &...
  19. K

    Perception, science, engineering and high-end audio

    Agreed. In terms of engineering for audio, (and lots of other areas), since no devices are perfect it is a matter of trade offs and deciding what is most important, and of course in most cases the cost of components and the impact on cost of the finished product
  20. K

    Perception, science, engineering and high-end audio

    In science a theory can be disproved using the Null Hypothesis for the theory. http://en.wikipedia.org/wiki/Null_hypothesis or as Einstein said: “No amount of experimentation can ever prove me right; a single experiment can prove me wrong.” The problem with audio is that each's persons...
  21. K

    Sweat over Room Dimensions and Mode Calculations, or Just Deal With Them?

    WIth the Sound LAbs the extra lenght is definitly a benefit, I like those speakers ~ 8ft from the front wall.
  22. K

    Sweat over Room Dimensions and Mode Calculations, or Just Deal With Them?

    Wouldn't the ideal be an Isosceles trapezoid (perhaps with a curved back wall) with a ceiling that varies in height.....lotsa luck getting the wife to buy in. Them you would need the CFD software to analyse the room....;)
  23. K

    Computational Fluid Dynamics software packages for room modal behavior modelling

    Here is an article at wiki giving some background: http://en.wikipedia.org/wiki/Computational_fluid_dynamics
  24. K

    Computational Fluid Dynamics software packages for room modal behavior modelling

    The software would allow one to determine (at least) how many and where to place SW speakers and room treatements to achieve design goals prior to purchasing eq, installing anything, and going on site to measure th room and then make adjustments. This would involve doing 'what if' simulations...
  25. K

    Class D

    Designing a SMPS is harder than designing a Linear PS, same with a Calss D amp, board layout, rfi all sort of issues that designing say a tube amp that designers don't hace to deal with. The CAE tools required are beyond the means of many small audi manufacturers.
  26. K

    Class D

    Ncore SMPS I would note that the Ncore module and it's matching SMPS 600 is for the DIY version. The OEM version is a different (higher powered) module the NC 1200. AFAIK Bruno has not designed a SMPS for the OEM Ncore 1200.
  27. K

    Subwoofer / Low Frequency Optimization

    I had a chance to use the Cello Palette on a good system back in the 80's you'd be surprised how much a good tone control can do to help improve the sound of a poor recording a lot of problems arre FR issues, which makes sense since the behavior of the systemthe recording (and room acoustics)...
  28. K

    Subwoofer / Low Frequency Optimization

    Thanks for the link, I find this whoel area fascinating. IMO this sort of processing plus Cello Pallette program eq can help us get the most out of our recordings. A lot of music i love are on poor recordings, which I tolerate because of the artistic values.
  29. K

    Subwoofer / Low Frequency Optimization

    You are using the contribution of each driver to the bass response of the room, this works below the Schrodinger freq of the room. Geddes has made the same point when using subs with his speakers in a multi sub arrangement. This may not be as applicable with a symmetric arrangements as per Welti.
  30. K

    Subwoofer / Low Frequency Optimization

    It sounds as if the JBL processor and the process described inthe article can allow the use of dissimilar subs.

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