line level pad
Sat, 11 Feb 2006 18:25:17 -0500
I'm using a Pro-Ject Phono Box MKII phono pre-amp with an M-Audio2496
sound card to copy vinyl to CD.
The output level of the MKII is too high for the sound card input and
the card clips.
Is there a commercially available line level pad of, say 5 - 10 dB,
that I could use between the two devices?
Can you tell me how to build a pad?
An adjustable pad would be great if it exists. (I didn't have this
problem when I was using my McIntosh preamp since I could adjust the
Input impedance 47k ohms
(irrelevant since we're connecting to its output; the output impedance of
any modern preamp is going to be quite low, like 1000 ohms or less, even
though it's designed to drive a 10k amplifier input)
Output voltage 300 mV @ 1kHz
Max. output 9.5 V (1kHz)
(those two seem to contradict each other, but the second one indicates that
it could indeed overdrive a sound card, even one with pro audio level
Peak Analog Input Signal +2dBV
(meaning it will take up to about 1.3 volts input)
Input Impedance 10k ohms minimum
(meaning its input impedance is at least 10k ohms and may be higher; that's
why we used a smaller resistor, 4.7k, on the output of the pad. Output
impedances should always be lower than the input impedance of the thing
Of course, if you believe one of the people who have posted on this group
recently, electronics has *nothing* to do with audio and you should just do
everything by ear.