Thanks, great reply, will do. The runs are 15m to each speaker
I just thought that @80hz it might of been effecting the clairty, with the bottom bass driver being over worked... Will test tomorrow at @140hz
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KabelDirekt – Pure Copper Stereo Audio Speaker Wire & Cable – Made in Germany – 2x2.5mm² – 15m – (For Hifi Speakers and Surround Sound Systems, Pure Copper, with polarity markings)
So you shouldn't be losing any top end sparkle due to roll off because the cable gauge is too small.
I don't know first hand how the Minx 22 would sound if significantly overdriven. I think you'd really have to be pushing things to extremes though to overwork the mid/bass drivers. You're unlikely to do that by frequency alone i.e. driving the Minx 22 with a crossover point of 80Hz. The speakers won't respond much below 120Hz, so whether the crossover point was set at 120Hz, or 100Hz, or 80Hz or even 20Hz won't matter from the speaker's point of view. However, it probably will change how much power the amp is allocating to the channel, and that will have an effect on the sound. This is why THX recommends 80Hz. It's less about the capabilities of the speakers and more about working around the current delivery limitations of multichannel AV amps and receivers.
Where you will start to hear the speaker changing is when you alter the crossover frequency at a point within the speaker's response range.
In the case of the Minx 22, the speaker will probably sound cleaner at 140Hz than 120Hz. In systems where all the bass below the crossover point is directed to the sub, then there's always a need to look at the sub's upper roll off point to see if it can fill in the remainder. A sub with say a 10" diameter bass driver might well go as high as 140Hz-160Hz. Something with a 12" or 15" driver would struggle.
In your case all your bass below the crossover points for the surrounds and the ATMOS speaker should be directed to the front speakers rather than a sub. The LFE track should be going there too. You should probably check this.
Once you have, then any perceived loss is more likely to be down to the characteristics of the speakers (the voicing) compared to the main speakers, plus the effects of room acoustics (first point reflections for the mains and centre usually) and any EQ applied by the receiver's room processing.
