What Daverz said X3! Even more so if you are using a moving coil cartridge.
It appears that your EAR had an input impedance for moving coil cartridges of 515 ohms. See the last paragraph under the sub-heading "The Inside" in this review: http://www.audiophilia.com/hardware/Analogue/reviews/ear834p.htm
Your ARC phono stage has a default input impedance of 47K (47,000 ohms), assuming it wasn't changed during the modification process. http://www.audioresearch.com/ph3.html. It includes provisions to change that value, I believe by inserting resistors of the desired value internally.
Moving coil cartridges (assuming that is what you are using) usually require a low-value resistive load (tens or hundreds of ohms) to dampen what would otherwise be a high frequency resonant peak. That peak is often at inaudible ultrasonic frequencies, but associated with it would be a frequency response rise in the upper treble, that would, among other things, over-emphasize sibilants.
This paper is somewhat technical, but is worth skimming through: http://www.hagtech.com/loading.html
So the bottom line, assuming you are using a moving coil cartridge, is to change the resistive loading to around 515 ohms or to some other value within the cartridge maker's recommended range.
If it is a moving magnet cartridge, then load capacitance becomes important, as explained in the Hagtech reference, which would also have effects on the upper treble, although to a lesser degree under typical circumstances.
Regards,
-- Al
It appears that your EAR had an input impedance for moving coil cartridges of 515 ohms. See the last paragraph under the sub-heading "The Inside" in this review: http://www.audiophilia.com/hardware/Analogue/reviews/ear834p.htm
Your ARC phono stage has a default input impedance of 47K (47,000 ohms), assuming it wasn't changed during the modification process. http://www.audioresearch.com/ph3.html. It includes provisions to change that value, I believe by inserting resistors of the desired value internally.
Moving coil cartridges (assuming that is what you are using) usually require a low-value resistive load (tens or hundreds of ohms) to dampen what would otherwise be a high frequency resonant peak. That peak is often at inaudible ultrasonic frequencies, but associated with it would be a frequency response rise in the upper treble, that would, among other things, over-emphasize sibilants.
This paper is somewhat technical, but is worth skimming through: http://www.hagtech.com/loading.html
So the bottom line, assuming you are using a moving coil cartridge, is to change the resistive loading to around 515 ohms or to some other value within the cartridge maker's recommended range.
If it is a moving magnet cartridge, then load capacitance becomes important, as explained in the Hagtech reference, which would also have effects on the upper treble, although to a lesser degree under typical circumstances.
Regards,
-- Al