Tweakers' Asylum

47k vs 100k volume pot question

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A

I was using a high end RadioShack 100k volume pot as a passive on my NAD C275BEE amp, with GREAT results.

I wanted to add IR remote so purchased a 47K alps pot board with IR remote control.

Connected the 47k and the results were not too pretty. Rolled off highs and dulled dynamics.

Could this simply be an impedance problem? Or sonic difference between volume pots?

Can the pot be removed off the board, so I can cobble something together to use the other pots? Or are they permentently fixed between motor and volume pot casing?

charles

Follow Ups:

RE: 47k vs 100k volume pot question - Palustris 08:20:52 06/30/14 (2)
"In theory" there should be no difference between the 100k and the 47k pot, but we don't know the output impedance of the source nor the length of the cable from the source to the pot so it is not possible to give an informed answer.

"Can the pot be removed off the board"

Without knowing the construction of the board, it is impossible to give an informed answer.
- RE: 47k vs 100k volume pot question - airtime 08:34:10 06/30/14 (1)
  The source is a Marantz NA7004 network player. I can't find the impedacne numbers for it?
  
  Length of the cables is the same between the two pots - about 2 foot, for a total of 4' both in and out.
  
  Board is the alps available at Bent audio.
  
  charles
  - RE: 47k vs 100k volume pot question - Palustris 12:07:01 07/01/14 (0)
    From a quick review of p. 35 of the Marantz NA7004 manual, it would appear that Marantz believes that consumers have no interest in the output impedance of their device. If the cables are the same for the two pots, we have to guess that the problem is with the volume controls and that somehow the Bent audio pot is compromising the signal in some way. As you are probably aware, the $10 pot from RS is made by Alps. It is possible that the "Alps" pot in the motor unit is one of the Chinese knockoffs. I have used both the RS Alps and the Alps in the little blue box (not the knockoff) and prefer the RS unit. You might be able to get the motor pot to sound better by reducing the length of the interconnects to a foot or two.

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