Big Signal Hit from AKG 414 on Avalon 2022 from Phantom 48

Posted: Fri Aug 15, 2008 1:49 pm

Hello people, I am wondering from sometime now why when I turn on or off the phantom power on my Avalon 2022 for my AKG 414 BXL II it gives 2 or 3 signal hits for over +3 dbs, an then settles. They work great together, but always behaves the same manner after turning on/off its phantom +48 power. Is this normal, sometimes in the powering of the +48 signal says hello this way?. Impedance for the 414 is >200 ohm. Avalons impedance switch is on the MIC, which is 1500 ohms. As I understand, Pre's impedance should be 10 times more than mics. Theres no 1000 ohms on the 2022, so I choose MIC, which is 1500. I powered also a 1974, U87 neumann, and It just powers without a hiss, no signal hit. Works great too. After the signal hits, which lasts a second, very short and it does not repeat, everything's good.

thanks recording.org
rafael

Posted: Fri Aug 15, 2008 7:23 pm

It is the +48 volt power supply overshooting while ramping up and stabilizng or when discharging. Nothing to worry about. Mute or turn down the volume when you do that and it won't ever be an issue.

Posted: Fri Aug 15, 2008 8:37 pm

at both actually, sometimes the intensity of pressing the 48 power button affects differently the hits, like if I push it slowly it'll strikes only once and not so harsh.
thanx for the answer anyway,

rafael

Posted: Fri Aug 15, 2008 9:33 pm

Maybe the contact is loose and if you push hard it's causing it to rapidly turn on, off and back on again?

Posted: Fri Aug 15, 2008 11:45 pm

Not all condenser microphones are made the same. Your Comparison Isn't Valid between Different Microphones. So, does this happen with one 414 & not the other? I get the impression you don't have a second one?

What you're hearing are the capacitors within the microphones electronics, charging up. YOU SHOULD NEVER HAVE YOUR MONITORS UP WHEN TURNING ON PHANTOM! So like telling the doctor it hurts when I do that. DON'T DO THAT. Unless you really hate your monitors and would like them to die a horrible death?

That is, unless, I totally misunderstood your question? Ouch!
Ms. Remy Ann David

Posted: Sat Aug 16, 2008 8:51 am

Yes mam, actually I have two 414 XB II, and they both behave the same. I obvioulsy turn down my master volume when turning phantoms on my pres, cause I do love my events 6". I know there is a big signal hit, because the meters in my avalon go over 3db and the overload bulb lights up, no need to hear the speakers bang. I never inquired about hurting my monitors, I just wanted to know why the microphones behave like this, while other do not. I just wanted to know is there was any reason, be that impedance, circuitry or just pre/microphone mismatch that I was missing. So yes Ms Ann, I think you misunderstood my question, but in all your sarcastic tone, I think there is information I can really use to my better understanding and higher learning, since this is the forum where home/studio projects should rely on for seeking help. Including amateurs like me.
thanx
rafael

Posted: Sat Aug 16, 2008 12:17 pm

Other's dont?
News to me. Thought it was standard behaviour.

Either way never let phantom go on/off when the output is being amplified.
Not just you, but anyone who might have their paws on your gear.

Posted: Sat Aug 16, 2008 12:29 pm

tried it with a vintage U87, and it doesn't... but if its a standard behavior, well then that answers my question, and my mind's at ease. good for my pre, and my mics.

thanxs everybody,
rafael.

Posted: Mon Aug 18, 2008 3:10 pm

The most confusing thing about this stuff is that condenser microphones' electronics can be vastly different from one another.

For instance, in the U87, the FET is utilized as an impedance converter into the microphone's internal transformers, which have 80 hertz cut off filters built in which could inhibit that nasty output, direct current like pulse.

In the 414, their methods are considerably different and include greater amounts of active amplified circuitry whose currents take longer to pulse through numerous capacitors. Causing multiple pulses from each amplification stage before settling down.

In the Sennheiser microphones, they utilize a type of RF modulated carrier to convert its output. So those are RF condenser microphones which should not be confused with wireless RF microphones. One is an internal method of conversion amplification. The other is a standard microphone type with a transmitter.

So welcome to the consistent inconsistencies of black magic voodoo audio.
Ms. Remy Ann David

No single system is better than the other, just different.

Posted: Mon Aug 18, 2008 4:34 pm

now you got me googling!!!!! and thats great
thanx.

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