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Noise Floor
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kgenus
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Joined: 01 Dec 2004
Posts: 889
Location: Greater NYC Area

PostPosted: Mon Dec 22, 2014 10:38 am    Post subject: Noise Floor Reply with quote

After moving my preamp (Audio Upgrades High Speed Mic Pre) into my booth, the noise floor dropped significantly. Another preamp manufacturer suggested I do this long ago, I didn't listen because I didn't want to sit in an oven. RX4 meter readings: -50ish db prior to the move, -65ish db after the move, high pass @ 44.5 hz dropped it far below -70db. This was with the UMT70S which has self noise @ 14.0 db(A).
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richvoice
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Joined: 12 Aug 2008
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Location: Tucson, AZ

PostPosted: Mon Dec 22, 2014 11:41 am    Post subject: Reply with quote

I don't get it. Why would moving a component INTO the booth decrease the noise floor?

Thanks,
Rich
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Jason Huggins
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Joined: 12 Aug 2011
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Location: In the souls of a million jeans

PostPosted: Mon Dec 22, 2014 11:51 am    Post subject: Reply with quote

I wonder if that is related to the length of XLR or something. Seems strange, but I'm sure there is some scientific explanation for it.
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Frank F
Fat, Old, and Sassy


Joined: 10 Nov 2004
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PostPosted: Mon Dec 22, 2014 12:07 pm    Post subject: Reply with quote

EMF or RF noise outside the booth could explain the difference. It may be the cable length, it may be the type of cable, it may be the cable is running parallel to a power cord. There are so many possible explanations pertaining to this scenario it boggles the mind.

The only thing we can actually say is: "It worked for Kevin". And that is GOOD!

Frank F
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vkuehn
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Joined: 24 Apr 2013
Posts: 688
Location: Vernon now calls Wisconsin home

PostPosted: Mon Dec 22, 2014 12:18 pm    Post subject: Reply with quote

I have become something of a fanatic on lowering background noises and noise floor and I never think of moving something INTO the booth as a way to reduce the unwanted sound.

kgenus: if you come up with an explanation of why that worked, please share it with us.

For years computer audio enthusiasts complained that having a sound care inside the computer box where all the strange electrical circuits created interference was bad, and back then ALL the external sound "cards" (devices?) were quite expensive.

Today much of the available equipment for getting audio INTO the computer is USB based, thus all the audio circuitry is OUTSIDE he computer case. Good! But the 'gotcha' is that the people building nice USB A/D converters want you to limit the length of the USB cable to FIVE FEET which gets to be an interesting process if you want to be able to reach the gain controls while in your booth. A good debate point for having preamps that are not part of the USB A/D converter.

So, kgenus, help us understand what reduced you noise floor so generously.
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kgenus
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Joined: 01 Dec 2004
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PostPosted: Mon Dec 22, 2014 12:38 pm    Post subject: Reply with quote

My guess is that something was being picked up and amplified. Whatever the case, it's an unbelievable difference, I didn't see it coming.
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Rob Ellis
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PostPosted: Mon Dec 22, 2014 2:00 pm    Post subject: Reply with quote

Kevin, you are a genus. cool
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Lance Blair
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Joined: 03 Jun 2007
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PostPosted: Mon Dec 22, 2014 4:15 pm    Post subject: Reply with quote

Interesting! Are you using a shorter XLR now Kevin?

I'm using a 6' XLR and a 6' USB. It's possible for me to go to 3' XLR and 3' USB - I'll have to try that. Not that I'm having noise issues, but it could be a touch lower.
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kgenus
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Joined: 01 Dec 2004
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Location: Greater NYC Area

PostPosted: Thu Dec 25, 2014 2:48 pm    Post subject: Reply with quote

Lance Blair wrote:
Interesting! Are you using a shorter XLR now Kevin?


My apologies for the late response, Lance. Yes, I'm using a shorter 6' XLR cable to the mic. The preamp is positioned at the base of the stand, with a 20' XLR output back to the 002, line level. It's not picking up anything, it's like being at studio in NYC.

By the way, the EIN on the HSMP is -132dBV @ 150ohm load and with the Sennheiser MKH416, whose nominal impedance is 25 ohm, it's coming in well under -70db sans high pass filter. That's just on paper, in function, it's so quiet I can't hear the expander closing unless I turn the JBLs all the way up and throw a limiter on it with fearful amounts of gain.

All meaningless when the thermostat drops and the heater comes on.
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Lance Blair
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PostPosted: Sat Dec 27, 2014 12:23 pm    Post subject: Reply with quote

Thanks. LOL on the heater - anybody else here crank the heat at like 85F for fifteen minutes before turning on the mics and then shutting the heat off for a few hours? Wink
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Mandy Nelson
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Joined: 07 Aug 2008
Posts: 2894
Location: Wicked Mainah

PostPosted: Sun Dec 28, 2014 5:35 pm    Post subject: Reply with quote

Lance Blair wrote:
anybody else here crank the heat at like 85F for fifteen minutes before turning on the mics and then shutting the heat off for a few hours? Wink


ME! ME! ME! ME! ME! The booth is in the barn and I keep the main part heated to 50 degrees F unless I'm teaching yoga in there that day then I pump it up to a whopping 60. I put the space heater in the booth to warm it, as you said then turn it off, and I also use that same heater on the yoga floor all during practice. It hasn't gotten terribly cold here in Maine yet, though, so I haven't had to do it everyday.
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Rob Ellis
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PostPosted: Sun Dec 28, 2014 6:47 pm    Post subject: Reply with quote

I'm on the opposite end of the weather spectrum in Florida....where between April and November, during an extended session in my booth, I've been known to strip down to cargo shorts and nothing more.....yes it does get that hot.

Okay, apply brain bleach to erase the visual...... cool
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Mandy Nelson
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PostPosted: Sun Dec 28, 2014 6:55 pm    Post subject: Reply with quote


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Manfillappsoc: The Mandy and Philip mutual appreciation Society. Who's in your network?

Have you seen my mic closet? ~ me to my future husband
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Lance Blair
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Joined: 03 Jun 2007
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Location: Atlanta

PostPosted: Sun Dec 28, 2014 7:29 pm    Post subject: Reply with quote

I hear you Rob!

I'm in a three story town-house with the office/studio on the top floor. There's a freaky huge 1970s atrium up the middle of it that brings the heat upstairs.

I try to book longer sessions for first thing in the morning here in Atlanta! Although honestly, since I moved here from Boston ten years ago we have fewer scorching days in the year than up in Beantown - but it's consistently near 90F for three months. Atlanta's not that hot...an hour or so south of here, say Macon or Columbus...fuggeddaboutit.
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Monk
King's Row


Joined: 16 Dec 2008
Posts: 1152
Location: Nestled in the Taconic Hills

PostPosted: Sun Dec 28, 2014 7:57 pm    Post subject: Reply with quote

I throw a lot of heat, which is why the kilt works so well for me.



Rolls Eyes
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