Can Luxman 509u drive JBL Ti5000

good looking speakers...

The specs speak for themselves 96dB with 1 watt at 1 meter is highly efficient. The min impedance is 5 Ohm with 6 nominal . My thinking is like the others a volume knob turned to 10 o'clock is hardly taxing your amp. It should be fine. If you don't like the sound quality a month or two down the line, then you have an issue.

Your volume control setting is a reflection of the total amount of gain in your system. This volume setting has little to do with the actual amount of power being utilized. Your amplifier could have high sensitivity, in other words likely less then one vote for full output. You would likely be better off with less gain in your system, this would provide more range and flexibility of your volume control.
Charles,

Greatm thks guys,
Luxman 509u is the greatest SS amp under 7k, the sound is amazing.