Cable quality matters for analogue signal transmission, but not for digital, except where the interference is so intense that the SNR is less than 0 dB. Even if everything Monster claims about their HDMI cables is true, they're still negligibly better than any no-name $5 cable.
Interference amplitude:
| signal | + | interference | = | result | interpretation | error |
|---|---|---|---|---|---|---|
| + | = | |||||
| + | = |