I have tried several resistors, some of them are best sounding for me and most of them sounds different if you change the dirrection on which you'll start the input signal.
Here's the result: (caution: quite long) :) and sorry if my english not really good
AUDIO RESISTOR COMPARISON SOUND AND DIRECTION TEST
TAKMAN REX CARBON COMPOSITE
>>> Bit edgy and hard sound and less detail, less bold than Riken RN std in the same direction but more organized
<<< Sweeter, more detailed, more musical, more airy and bit more warm, tone more balanced and organized
DALE RN60 METAL FILM MIL SPEC
>>> Quite neutral, detailed high and crisp, more bold sound than takman (or more like direct cable I guest), not as sweet as Takman but less edgy and breathe music more strong bass also + bit hard if compare to direct straight wire (less liquid)
<<< Bit sweeter but less bold, airy too, clearer high bit, and more musical a bit, still have strong bass but little lean
RIKEN RMG CARBON (I like this resistor when it compare to almost all this reviewed resistor except TX2575)
>>> Sweet and spacious sound, detailed and airy, good bass and warm mid bit laidback compare to shinkoh
<<< As mentioned above but bit more musical, more breathe, but bit less definition and bit less dynamic
AUDIONOTE TANTALUM
>>> Sweet and musical, not as much air as Takman (in reverse direction), good bass felt bit tubelike sound and midrange domination
<<< As mentioned above but bit less bass leading edge (I need more test on this)
RIKEN RN STANDARD (BROWN COATING AND NO GOLD PLATED)
>>> Bit sharp high, bit edgy / hard, but good definition
<<< Warmer sound and bit woolly bass, more musical and rich, staging more wider and deeper (also compare to Takman) bit midrange domination
SHINKOH JAPANESSE TANTALUM
>>> Sweet, detailed and airy and have big dimension in sound stage, quite neutral sound and draw me to music deeper (I feel overdominate in midrange compare to Riken or other neutral sounding resistor and then I decided to remove it and substitute with neutral sounding resistor) + slightly thinner sound compare to straight wire but calm presentation and leaner bass.
<<< As mentionded above but bit warmer sound (coloration I think) and bit overdetail high (edgier)
MILLS WIREWOUND 5 WATT
>>> Neutral sound, airy and dynamic sound, but not as sweet as tants, leading edge also in good side
<<< Less definition a bit but seems sweeter a bit / warmer (need more test)
KIWAME CARBON 2 WATT
>>> Bit noisy and high more apparent, other are quite neutral (need more test)
<<< Bit sweet and detailed also more airy (need more test)
KOA METAL FILM
>>> Sound more like Dale RN60, detailed and airy, bit sweet also
<<< As mentioned above but less bass, bit bright side but not sharp (need more test)
VISHAY NAKED Z-FOIL TX2575 or Z201
>>> This is what I say about, almost perfect resistor, the sound is all you wish your audio equipments sounds, imidiate, harmonic detail, open, detail but not sharp high, great bass, musical, neutral and smooth mid but not overly sweet, great dynamic, clean sound and fast Very Recommended for upgrading the effect almost like you change standard capacitor with much better one. My only complain is it added bit bass to male and female vocal, makes it bit thick. I never try other direction since it says no direction because of laser etched foil technology is almos equal on both side.
AMTRANS AMRG 2W CARBON RESISTOR
>>> Compare to riken RMG this resistor bit more open and more neutral but less lusher. Better in music description and more musical compare to dale metal film. For musical taste I like riken than this amtrans.
<<< Less neutral and less lusher (bit forward)
Here's the result: (caution: quite long) :) and sorry if my english not really good
AUDIO RESISTOR COMPARISON SOUND AND DIRECTION TEST
TAKMAN REX CARBON COMPOSITE
>>> Bit edgy and hard sound and less detail, less bold than Riken RN std in the same direction but more organized
<<< Sweeter, more detailed, more musical, more airy and bit more warm, tone more balanced and organized
DALE RN60 METAL FILM MIL SPEC
>>> Quite neutral, detailed high and crisp, more bold sound than takman (or more like direct cable I guest), not as sweet as Takman but less edgy and breathe music more strong bass also + bit hard if compare to direct straight wire (less liquid)
<<< Bit sweeter but less bold, airy too, clearer high bit, and more musical a bit, still have strong bass but little lean
RIKEN RMG CARBON (I like this resistor when it compare to almost all this reviewed resistor except TX2575)
>>> Sweet and spacious sound, detailed and airy, good bass and warm mid bit laidback compare to shinkoh
<<< As mentioned above but bit more musical, more breathe, but bit less definition and bit less dynamic
AUDIONOTE TANTALUM
>>> Sweet and musical, not as much air as Takman (in reverse direction), good bass felt bit tubelike sound and midrange domination
<<< As mentioned above but bit less bass leading edge (I need more test on this)
RIKEN RN STANDARD (BROWN COATING AND NO GOLD PLATED)
>>> Bit sharp high, bit edgy / hard, but good definition
<<< Warmer sound and bit woolly bass, more musical and rich, staging more wider and deeper (also compare to Takman) bit midrange domination
SHINKOH JAPANESSE TANTALUM
>>> Sweet, detailed and airy and have big dimension in sound stage, quite neutral sound and draw me to music deeper (I feel overdominate in midrange compare to Riken or other neutral sounding resistor and then I decided to remove it and substitute with neutral sounding resistor) + slightly thinner sound compare to straight wire but calm presentation and leaner bass.
<<< As mentionded above but bit warmer sound (coloration I think) and bit overdetail high (edgier)
MILLS WIREWOUND 5 WATT
>>> Neutral sound, airy and dynamic sound, but not as sweet as tants, leading edge also in good side
<<< Less definition a bit but seems sweeter a bit / warmer (need more test)
KIWAME CARBON 2 WATT
>>> Bit noisy and high more apparent, other are quite neutral (need more test)
<<< Bit sweet and detailed also more airy (need more test)
KOA METAL FILM
>>> Sound more like Dale RN60, detailed and airy, bit sweet also
<<< As mentioned above but less bass, bit bright side but not sharp (need more test)
VISHAY NAKED Z-FOIL TX2575 or Z201
>>> This is what I say about, almost perfect resistor, the sound is all you wish your audio equipments sounds, imidiate, harmonic detail, open, detail but not sharp high, great bass, musical, neutral and smooth mid but not overly sweet, great dynamic, clean sound and fast Very Recommended for upgrading the effect almost like you change standard capacitor with much better one. My only complain is it added bit bass to male and female vocal, makes it bit thick. I never try other direction since it says no direction because of laser etched foil technology is almos equal on both side.
AMTRANS AMRG 2W CARBON RESISTOR
>>> Compare to riken RMG this resistor bit more open and more neutral but less lusher. Better in music description and more musical compare to dale metal film. For musical taste I like riken than this amtrans.
<<< Less neutral and less lusher (bit forward)