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Showing content with the highest reputation on 09/03/2023 in all areas
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IN this series, THD+N versus frequency, 20 Hz - 20 kHz. At the equivalent of 100 dB SPL (100 V RMS). THD Is Very very even all the way from 20-20k. at about 0.2% THD. In this series, the THD+N at 110 dB SPL is actually LESS than at 100 equivalent dB SPL, telling us that the measurement mostly consists of noise, not THD. That's all the Carbon measurements I have on hand.4 points
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Someone asked me for my equivalent measurements of the Mjolnir KGSS Carbon HV. OK, I have a bunch of measurments. To keep them separate as it seems that image files don't automatically get labels in this forum, I'm going to post them one at at a time. Forgive me if I'm mistaken, the easiest thing for me to do is make one post at a time. Where you see the rising high frequency response at the high end, that's the noise shaping of my Prism ADC/DAC which I use for analysis in conjunction with Spectraplus. Note that at the time I made these measurements I was not aware that it would be advantageous to add a 100 pf capacitor on the load. So these are open loads, and perhaps some of the tiny ringing you see would go away. The first is a digital scope photo of a 1 kHz Square wave at 200 volts p-p from my Fluke Scope. Attached here. In this series Mjolnir KGSS Carbon 100 Hz Square wave 250 V p-p2 points
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In this series, Mjolnir KGSS HV Carbon noise floor in equivalent SPL is around or below -15 dB SPL. That's MINUS 15 dB SPL, folks. Aha! In this series, I took the IMD with an SPL scale. So at the equivalent of 90 dB SPL for the Stax 007 Mk 2, here's the IMD. It's much lower than the previous IMD measurement, which must have been taken near clipping. Of course there is no meaning to equivalent SPL for a 19-20 kHz signal! But the scale is calibrated for SPL at 1 kHz so you get the idea of the amplitude of the test signal. Here, not so overloaded you can see VERY little 1 kHz difference product at the equivalent SPL of about -2 dB SPL! And no trace of 18 kHz or 21 kHz IMD. So at these already extreme levels, at extreme high frequency levels that would not be found in normal music, the Carbon HV performs exemplararily (if that's a word).1 point
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In this series, the right channel freq response is nearly identical so not worth displaying here. Just below clipping, equivalent SPL of 113.4 dB SPL at 1 kHz, produces 0.025% THD. I have an attenuator and by accident, apologize for the inconsistency, the scale is dBu, but my notes say 113.4 dB SPL equivalent. That is a remarkable 467 V RMS. THD is 0.024/0.026% THD at that point. In this series, Mjolnir 19-20 khz IMD. The amplitude of the 18 and 21 kHz products is not exceptional, but to my ears this is still one of the the nicest, most natural and warmest Stat amp I have ever heard. IMD measures 0.018/0.021%. Amplitude is not specified, but I suspect given my scales, it's near 100 V for either one of the partials.1 point
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In this series. I like to mark levels in equivalent SPL. Based on the 100 volt RMS rating of the CRBN headphones. So this is close to 100 Volts RMS. Mjolnir spectrum at 97 dB equivalent SPL at 1 kHz. As you can see, it's pure second harmonic with no other trace of harmonic distortion. Second harmonic is at the equivalent of about 10 dB SPL! In this series, KGSS Carbon HV left channel frequency response. I'm using a transfer function with white noise, so for whatever reason at above 60 kHz, the transfer function goes funky and is unreliable. The amp is flat from 10 Hz and only -0.6 dB at 60 kHz!1 point
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I can't recall if I posted the screenshot of the "Workers in Tennessee collecting the Dew from the Mountains" post in here or not. Either way, here's the whole set.1 point
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There are so many regional Buffet-wannabes, my favorite was Pat Dailey on those sometimes freezing Great Lakes (now living the dream in the Keys), Buffet’s influence spread wide, though I feel compelled to keep the streak going and report not being a fan. I do want to commend the NYTimes, “Roguish Bard of Island Escapism” is an obit title for all to be proud of. I didn't realize there was a musical...1 point
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Diet Coke and The Beach Boys 5th row center, but the bloody chairs were aligned wrong to the stage, so it was just a hair left of center, but still, not too shabby. The Beach Boys obviously had to give it up to the greatest Beach Boy, Sir Uncle Jesse. Sadly, he wasn't there this day, but they're playing Vegas in a couple weeks, and I wouldn't be surprised... The Beach Boys covering The Ramones - Rockaway Beach Rockaway Beach - The Beach Boys covering The Ramones.mp41 point