If you have speakers that are designed for it then you can reduce distortion. (TYhis requires a speaker with crossover sections that can be separated)
See this article
If you don't hear a subtle difference then perhaps...
1) Your speakers are not designed for proper bi-wire
2) Your amp is not doing enough to control the output (output impedance may be too high)
3) The speaker crossover is of high order and it dominates or something else is masking the IMD distortion reduction
4) Your bass woofer is super linear and creates only inaudible harmonic/IMD distortion/breakup outside of its intended band (unlikely).
See this article
If you don't hear a subtle difference then perhaps...
1) Your speakers are not designed for proper bi-wire
2) Your amp is not doing enough to control the output (output impedance may be too high)
3) The speaker crossover is of high order and it dominates or something else is masking the IMD distortion reduction
4) Your bass woofer is super linear and creates only inaudible harmonic/IMD distortion/breakup outside of its intended band (unlikely).