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Ukko Kari

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Ukko Kari last won the day on June 19 2018

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About Ukko Kari

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  1. Ukko Kari

    BMS 18N862

    Has anyone else noticed that US Speaker no longer lists this driver on their site? ?
  2. Interesting read, thanks. I have read a few articles from John Allen over the years, though I had not read the "Missing" article before. I concur that distortion makes a source seem louder than it actually is, and that people need to use their ears and not their eyes listening to sound.
  3. Ukko Kari

    Faital 15PR400, BMS 4594 MTM

    For the moment I will just replace it with another. I have a bunch of filters loaded in a DCX 2496, but work has been crazy, lots of overtime and not enough free time to swap it in with a QSC. Fast and easy to flash another Nu3000DSP. Crown should have taken notes from Berhinger on the user friendliness of the DSP.
  4. Ukko Kari

    Faital 15PR400, BMS 4594 MTM

    Tonight listening to music fairly loud, hitting the peak limiters in the iNuke 3000 DSP, suddenly I had red rings of death. I did have a saved preset file, and also some screen shots of the DSP settings. The amp made 6 years before it failed.
  5. Ukko Kari

    Bulding the Room2 listening room

    I like your format. Even though the room will dominate in the actual measured response, outdoor GP is the best measure, since all devices are on an equal playing field. A 'FAQ' or frequently asked questions section on your website can answer a lot of the same repetitive questions that can tie up your time replying to inquiries. Well informed customers can then email you for additional information on your products.
  6. Ukko Kari

    Sound card and measurement mic upgrade

    Just an update, I was gifted a Behringer UMC204HD at xmas. I could not get it to play nice with Windows 10, even with the latest drivers, not sure if it was defective or not, but searching the internet other people had similar experiences, swirling garbled audio, regardless of connection. It went back to the vendor, and there is a credit to use up. Still thinking of the Scarlett 2i2 2nd gen, any other suggestions?
  7. Ukko Kari

    Faital 15PR400, BMS 4594 MTM

    Now that I have spent time with voicing the speaker, I haven't worked up the ambition to dial in a crossover on the Behringer DCX 2496, and move to the QSC power amps. Not to mention the other projects on the go! Cold weather puts a damper on working outside.
  8. Ukko Kari

    X-curve compensation re-EQ

    You just need the right guy to move and install those wooden refrigerators. https://en.wikipedia.org/wiki/Magnús_Ver_Magnússon
  9. Ukko Kari

    Sound card and measurement mic upgrade

    From Ethan Winer: http://ethanwiner.com/myths.html Myth: Absolute microphone or speaker polarity makes an audible difference. Fact: While nobody would seriously argue that it is okay to reverse the polarity of one signal in a stereo pair, I've never been able to determine that reversing the polarity of one signal - or both if stereo - ever makes an audible difference. Admittedly, it would seem that absolute polarity might make a difference in some cases, for example, when listening to a bass drum. But in practice, changing the absolute polarity has never been audible to me. You can test this for yourself easily enough: If your console offers a polarity-reverse switch, listen to a steadily repeating bass drum hit and then flip the switch. It is not sufficient to have a drummer go into the studio and hit the drum while you listen in the control room, because every drum hit is slightly different. The only truly scientific way to compare absolute polarity is to audition a looped recording or drum sample, to guarantee that every hit is identical. Important Update: Mike Rivers from Recording magazine sent me a test Wave file that shows absolute polarity can be audible in some circumstances. The polarity.wav file (87k) is a 20 Hz sawtooth waveform that reverses polarity in the middle. Although you can indeed hear a slight increase in the low end fullness after the transition point, I'm still not 100 percent certain what this proves. I suspect what's really being shown is a nonlinearity in the playback speaker, because with a 50 Hz sawtooth waveform there is no change in timbre. However, as Mike explained to me, it really doesn't matter why the tone changes, just that it does. And I cannot disagree with that. More Update Info: After discussing this further with Mike in the rec.audio.pro newsgroup I created two test files you can download and audition yourself. The Kick Drum Wave file (324 KB) contains a kick drum pattern twice, with the second reversed. Play it in SoundForge or any audio editor that has a Loop mode, so you can play it continually to see if you hear a difference. The Voice Wave file (301 KB) is the same but with me speaking, because Mike says reversing polarity on a voice is surely audible. I don't hear any difference at all. However, I have very good loudspeakers in a room with proper acoustic treatment. As explained above, if your loudspeakers can't handle low frequencies properly that could account for any difference you might hear.
  10. Ukko Kari

    Sound card and measurement mic upgrade

    Regarding reversed polarity, consider the example of simply using the device for playback: Instead of a forward motion on the speaker diaphragm, you will have a rearward movement. This will change our perception of the sound of a completed system if this is not corrected, especially in the bass, not so much in the region where wavelengths are short, and small head movements will cause many rotations of phase.
  11. Ukko Kari

    Pushing a horn: how to measure (with an UMIK1).

    I concur, a boom mic stand is a solid investment when it comes to measurement gear. Here is an example from Amazon: https://www.amazon.com/AmazonBasics-Tripod-Boom-Microphone-Stand/dp/B019NY2PKG/ref=sr_1_3?s=musical-instruments&ie=UTF8&qid=1513464419&sr=1-3&keywords=boom+mic+stand I am sure you should be able to source one locally similar to the example. It does not need to be a heavy duty model, and the slimmer the better. ( you do not want reflections from the mic stand to reach the mic capsule )
  12. Ukko Kari

    Pushing a horn: how to measure (with an UMIK1).

    Also of note, you must ensure that the settings in Windows ( I assume you are using Windows, not Mac or Linux ) match those set in REW ( 2 channel, 44.1 khz ) as these can be set differently, and your results can be wonky. Every time I use REW, I have to change the settings for Windows under the sound device.
  13. Ukko Kari

    Pushing a horn: how to measure (with an UMIK1).

    Good question, with my duplex sound card, I use a loopback cable, in essence, returning the output of the sound card to the input. The software calculates the round trip latency and deducts that from the signal arriving from the microphone input, thus giving you your delay measurement. On one channel, the microphone is connected, on the other, the loopback cable. Alternately, REW can use a high frequency device to calculate delay. This requires the sweep to be set full range, and it will listen for the high frequency chirp before the measurement. ( Typically only used for full range loudspeakers ) Yes your Marantz has time delay functionality. I am not familiar with Audessey products, and if utilizing it will give you an appropriate delay. Someone more familiar may be able to help you out in this regard. Since the UMIK-1 is a USB device with no other input, you could add a second sound card with just a loop back cable in order to have REW calculate the time delay. In the drop down menus in REW, you have the option of telling the software what inputs and outputs you would like to use. Hope that helps you.
  14. Ukko Kari

    Sound card and measurement mic upgrade

    I have done some more research on sound cards, and came up with some interesting information. The Behringer UCA-202 has reversed polarity on both the input and outputs, the only one in the test to exhibit this phenomenon, according to this website: http://www.daqarta.com/dw_gguu.htm Polarity: The Polarity tests were done using a separate scope. The Generator was set to produce a biphasic Pulse waveform, such that the positive phase preceded the negative phase, and there was a dwell time at zero before the next pulse. The output had normal polarity if the positive phase appeared first on the scope. A loopback cable was then used to feed the output back to the input, and if the Input waveform seen by Daqarta also showed the positive phase first, the input likewise had normal polarity. This was the case with all devices except the Behringer UCA202, which inverted both the output and input (which means that it could not have been detected with a loopback alone). Read this thread on DIY audio, might have second thoughts on the Focusrite Scarlett 2i2 sound card. http://www.diyaudio.com/forums/equipment-and-tools/301166-focusrite-scarlett-2i2-2nd-gen-measurements-whats.html This thread has me looking at another Behringer: http://www.diyaudio.com/forums/equipment-and-tools/312454-usb-audio-interface-measurement.html
  15. Ukko Kari

    Pushing a horn: how to measure (with an UMIK1).

    Typically, horns with short path lengths are used in multiples, to extend the low frequency capability, when tightly packed. This appears to be a front loaded horn, which below the corner where the horn is effective, is still an 18" woofer in a small sealed box, so you can apply a modest bit of eq to boost the bottom end, but will have to keep in mind the short throw of the driver. I would only recommend doing so in a domestic environment like yours, not in a dance club or other pro use. With REW, you can play a sweep through the subwoofer from say 25 hz to 200 hz, and look at the response. I am not familiar with the UMIK-1 mic and interface, other than having read of the possibility of clipping the signal with high sound pressure level. This is dependent on the dip switch settings inside the mic on the preamp board. http://www.avsforum.com/forum/155-diy-speakers-subs/1797489-massively-clipped-umik-1-a.html People have received the UMIK-1 with different dip switch settings, both 12 db and 18 db. If you do not have a sound pressure level meter, you could likely use an application with a smartphone to set the level to calibrate the level with pink noise in REW before making a sweep. Start by measuring the time delay of the subwoofer, you will need that to tell the Marantz to delay all other channels with respect to the bass horn.