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Thread: Can I damage condenser mic by phantom power supply connected over unbalanced XLR cabl

  1. #31
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    Quote Originally Posted by joey2000 View Post
    I have no idea what that means but referring to me as a kid was oddly funny and tragic (ie its inaccuracy) at the same time.

    Also moot! And really you highlight my point: I get why things were a mess back when...not now. With all of our advances I'd think we would have one freaking cable type, one or perhaps two connector types, period. Standardization has been a hot topic in high-tech for a long time now. We may have come a long way but it aint far enough!
    The remark was a general one Joe! It would have applied to me at 60 ten years ago WRT computers!

    We HAVE come a long way with standards. The problem was caused by manufacturers trying to force everyone to use THEIR products and we have seen this in respect of power supplies. Wall rats and line lumps. There is NO technical reason for the vast variety of voltages, current capabilities and connector types. Thank fk most are now +ve centre (except pedals!) We only really need 5V at an amp, 12 V at 2 amps for the vast ,majority of devices.

    Mnfctrs have, over the years tried to 'cash in' by inventing new connection protocols..Whither mLan now? (actually seeded much of the research into Audio over Internet. Bloody good article in the current SoS about Dante et al)

    There will always be variants and specials. Most of us don't need star quad cable but it should be there for them as does.

    I lived through the total farce that was Quadraphonics. Competition might be a good thing in economic theory but it can also waste a fucking SHEDLOAD of money, time and resources!

    Dave.

  2. #32
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    A shorted cable can damage input of the preamp, if inserted with phantom on, because input capacitor sends -48V to the base of the input transistor. A simply clamp diode for each transistor avoid any damage.

    If a microphone has an output transformer, a shorted cable can magnetize its core, because magnetic flux become unbalanced between the coils.

  3. #33
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    Hi there,
    replacement mic from amazon already arrived and guess what, it works :-)

    I still can't believe it is possible, but the original one was really defective and missing a part on PCB, although apparently new.

  4. #34
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    Comparison of Chord CM05 condenser mic and Pulse PM800S dynamic mic

    Let me say just a little follow up. I tried to compare this mic (Chord CM05) with another mic - Pulse PM800S.
    PM800S is a dynamic mic which I found on a page listing budget but still quality mics The Noizeworks Product Guides: More Mic For Your Money. Budget Mics Product Guide. Part 1: Dynamic Vocal Mics.
    I bought it on eBay for half price compared to Chord CM05.

    I used an app in my phone to generate simply sinusoidal tones of various frequency (250, 440, 1000, 3000, 10000Hz) and recorded it Chord and then by Pulse. I put the phone right in front of the mic and there was no noise source in that direction. I'm using focusrite scarlett 2i2 2nd gen as recording device (at 24bit and 96kHz) and recorded a few secs each time.
    I looked at spectrogram of both recordings (window size set to 16384 to get more detailed resolution at frequency axis) and found out a little bit less intensity of higher harmonics, but what surprised me more - significantly more low frequency noise. See images below:
    Low frequency noise, recording 440Hz
    mic-spectrum-chord-pulse-jpg
    Low freq noise, recording 1kHz
    mic-spectrum-1k-chord-pulse-jpg
    Higher harmonics, recording 1kHz
    mic-spectrum-1k-harmonics-chord-pulse-jpg
    Am I somehow misinterpreting results or did I something wrong about the way I tested it?
    If I'm right, it surprises me a bit. I actually expected better quality from Chord (as it is condenser mic).

    As for real usage (recording voice), I perceived the sound of Chord a bit better than Pulse - more clear (but it might be just auto-suggestion because Chord was more expensive). Also Chord has a bit better suppresion of handling noise (but it does not directly relate to sound quality itself).
    Last edited by Taylor729; 08-27-2017 at 15:36.

  5. #35
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    Try using a spectrum analyzer. Not sure what your graphs are. Mics under L20? You do get what you (don't) pay for!
    Mike B My new album on CD Baby: Fact and Fiction
    My Bandcamp site: http://mikebirchmusic.bandcamp.com

  6. #36
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    Quote Originally Posted by mjbphotos View Post
    Try using a spectrum analyzer. Not sure what your graphs are. Mics under L20? You do get what you (don't) pay for!
    +1 Mike, I can't see any information value at all either! Why do people think phones are magic? The 'speaker' is going to be DIRE! Microphone calibrating kit costs arms and legs.

    The op would do better to just record 'Mary had' for 20 secs on each mic and post the best MP3 he could.

    Dave.

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  8. #37
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    Graphs are spectrograms (I mentioned it in my post). Horizontal axis is time, vertical is frequency and color represents level. I am completely aware that I was not buying high quality equipment. I do it just for fun and it does not generate me any profit and I have other hobbies too. Nevertheless at least (I hope you see it in the same way) I bought reasonable audio interface, at least.
    Regarding the mics, I was just thinking about it rather in the way that Pulse PM800 might be pleasant surprise than the Chord is disappointment (although in fact it is, a bit - I could save money I spent on it for something better).

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    Hi, Taylor
    Please consider:
    1) Audio measurements are very, very critical. A phone speaker is really, really inadequate for a microphone frequency response test!
    2) The "perfect microphone" cannot exist! Microphones response is tailored for a better sound in some applications; voices are very different each other and each one likes to hear his voice in a manner different from others, then you have to test microphone to find the one that makes the sound you like with your voice. A bit of mixer EQ is also added, but capabilities of an analog mixer EQ can't modify the personality of a mic, and a singer prefers start from a good sound by his mic type, instead of trying obtain it with EQ...
    3) A well modeled response mic has a brighter, vivid sound than a flat response one

  10. #39
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    Please consider:
    1) Audio measurements are very, very critical. A phone speaker is really, really inadequate for a microphone frequency response test!

    ^ Agreed:
    2) The "perfect microphone" cannot exist! Microphones response is tailored for a better sound in some applications; voices are very different each other and each one likes to hear his voice in a manner different from others, then you have to test microphone to find the one that makes the sound you like with your voice. A bit of mixer EQ is also added, but capabilities of an analog mixer EQ can't modify the personality of a mic, and a singer prefers start from a good sound by his mic type, instead of trying obtain it with EQ...

    True ^ but measurement 'B&KS' get PDClose! The Earthworks microphones are noted for their very flat, very wide response and are very popular with many engineers/producers.
    3) A well modeled response mic has a brighter, vivid sound than a flat response one

    ^But not everyone wants that! There is a bit of a divide (more a chasm!) in the recording fraternity these days. It is approaching the silliness of the Russ Andrews 'Audiophool' brigade IMHO. Yes there IS a case for 'flattering' microphones but there is an even bigger one in my view for 'flat' ones that 'Tell it Like it is!'

    Dave.

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