If you hear distortion with new gear upstream, can’t rule out the possibility something there is the source. If it corresponds to the speed of the turntable, could well be an issue with the phono section of your system.
What cartridge is being used? Moving coil or Moving magnet? Is it properly connected for that to the amp? Is it possible the stylus on the cart is damaged or worn? Do you hear distortion with non-phono sources?
Just some things to consider before assuming it is the speakers. Many ways to produce distortion if a phono rig is not set up properly.
FWIW those Thiel are as good or better than most assuming they too are in good operating condition. Damaged crossover tweeter or other drivers would likely cause distortion.
If the distortion is associated with higher volumes with any source could be amp clipping. THiels are not efficient and usually require a lot of power and current to sing. but that Luxman should be up to the task.
What cartridge is being used? Moving coil or Moving magnet? Is it properly connected for that to the amp? Is it possible the stylus on the cart is damaged or worn? Do you hear distortion with non-phono sources?
Just some things to consider before assuming it is the speakers. Many ways to produce distortion if a phono rig is not set up properly.
FWIW those Thiel are as good or better than most assuming they too are in good operating condition. Damaged crossover tweeter or other drivers would likely cause distortion.
If the distortion is associated with higher volumes with any source could be amp clipping. THiels are not efficient and usually require a lot of power and current to sing. but that Luxman should be up to the task.