Preamp Impedance Matching Clips (Modded 5150 II)

[lolzgreg]

I know someone else here did a clip of lowering the input impedance of a microphone preamp. This is done by soldering a resistor between pins 2 and 3 of an xlr cable (the male side) inside the protective housing. You calculate the kind of resistor you need by using this formula:

(1/desired input impedance)-(1/microphone pre's current input impedance)

and then dividing 1 by the answer you receive above:

for example:

(1/300)-(1/2850) =.002982

input below

(1/.002982) = 335.34

Nearest resistor to this- 330 ohms

I used the number 300 because it is the input impedance of most Neve preamps and also very close to the input impedance of MANY MANY dynamic microphones.

Chain used: Dean Vendetta w/ Duncan Mustaine Livewires-> 5150 II (Modded)-> Mesa Standard 4x12 straight (oversized)-> Audix i5-> Modded or Unmodded Cable-> M-Audio Octane-> RME Fireface 800 Lightpipe In

No boost on the amp this time.

The first two repetitions of the riff (up to 22 seconds) is part A and the second two from 22 seconds to the end is part B.

Nothing was used on the DAW aside from Dithering to Mp3, period.

Enjoy: http://www.soundclick.com/bands/page_songInfo.cfm?bandID=926935&songID=7672480

 

[Joematthews]

I can't tell the difference at all.

Joe

 

[nwright]

I can't tell the difference at all.

Joe

+1

 

[nwright]

well, after listening a few times, the first one has thicker sound palm mutes, maybe a little boomier I suppose.

 

[2000ContourSVT]

well, after listening a few times, the first one has thicker sound palm mutes, maybe a little boomier I suppose.

Yeah I agree, although I probably wouldn't have noticed it so much if you hadn't said that.

 

[Metaltastic]

well, after listening a few times, the first one has thicker sound palm mutes, maybe a little boomier I suppose.

Agreed, though I doubt the differences would be perceptible in a mix!

 

[Fox Mulder]

Agreed, though I doubt the differences would be perceptible in a mix!

+1

 

[lolzgreg]

I can't believe you guys don't hear the difference. A lot of the cloudiness and tinny sound of the top end seems to be remedied in the second half of the clip. I suppose I will test this on different sources.