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Author Topic: Attenuation pads: differences  (Read 3328 times)

dobster

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Attenuation pads: differences
« on: February 04, 2007, 11:15:59 am »

when i mix, i feed my daw to my analog console which feeds a bus compressor. the output of the console is +28dbu while the compressor has a +20 input. I need to attenuate the signal after the console obviously before it hits the compressor. i thought pads then. since pads are fairly simple, and are just a small network of resistors, is there such a thing as "high quality" versus "low quality" pads? no sonic impact/degradation?
and they seem so simple i was considering just building it.

or the options are, a) reduce the master fader on the console (yuck)
b) reduce all signals feeding the console from within the DAW (ehh)

my converters btw, only have a +4/-10 calibration.
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dobster

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Re: Attenuation pads: differences
« Reply #1 on: February 04, 2007, 06:42:21 pm »

WOW, nobody????
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rodabod

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Re: Attenuation pads: differences
« Reply #2 on: February 05, 2007, 09:29:06 am »


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Roddy Bell

rodabod

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Re: Attenuation pads: differences
« Reply #3 on: February 05, 2007, 09:31:41 am »

We were just discussing this over at the Electrical Audio forum actually.

Just make sure the impedances seen at the input and output are suitable for bridging line level signals.

Should be fine. Regarding high-quality, if you are building a U-Pad, stick with 1% tolerance resistors just to maintain good CMRR and you will have a quality pad. You can simply build it into a cable on one of the XLR plugs.

See here for a nice description:  http://www.uneeda-audio.com/pads/


Roddy


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Roddy Bell

Andres Gonzalez

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Re: Attenuation pads: differences
« Reply #4 on: February 05, 2007, 07:03:29 pm »

For mic level signals, I use the Shure attenuator (Shure model # A15AS). It is a small tube with XLR connectors on each end, one male and the other female. It provides switchable attenuation of 15dB, 20dB, and 25dB.  It, of course, is designed with input/output impedances for mics, that is, an output impedance of 150 ohms to interface with the input of a typical mic preamp. However, you could take one of these, disassemble it, and replace the resistors in it with others so that your input and output impedances would be better for line level use.

-Andres
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dobster

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Re: Attenuation pads: differences
« Reply #5 on: February 05, 2007, 08:48:17 pm »

i really appreciate it, finally some responses.
yeah, this will be at line level operation. because its from console outputs into compressor inputs. i don't see it as much of a hassle to build these myself. so, im curious though as to which connections the resistors are soldered to? in a balanced signal, i want to get 4 jacks, two inputs obviously and 2 outputs (stereo) and im wondering if the resistors connect to 1,2 or 3 (t,r or s)? and why exactly?
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