Luxman 509x VS Luxman 509Z

Some here live deep into this hobby and you’ve really given nothing tangible regarding a system.  One of my several integrated amps is the 509X.  It is loved and fed well, surrounded by great pieces allowing peak performance.

We’ve nothing to work off.  So, whatcha got?

The 509Z is better than the 509X, but it's not night and day... I wouldn't replace the X if I had it already, just not enough of a difference to justify the relatively significant cost difference between them.

I recently purchased the 509z to replace an older McIntosh Integrated and posted my comments on this thread.

https://forum.audiogon.com/discussions/luxman-505z

Hoping to find some answers which model will match my speaker more. Thanks so much. 

Hi @simonleboom I was just thinking post a topic about a comparison between the 590II VS 590X, until I saw this. Would you mind sharing some thoughts between the two model. Much appreciate if possible.
My current speaker is

SC-IV/ASC-IV/A

Description: Three-way dynamic loudspeaker. Drive-units: 1" composite textile-dome tweeter, two 5.5" paper-cone midranges, two 10" long-throw paper-cone woofers. Crossover: first-order design (frequencies not specified). Biwire and biamp capability. Frequency response: 25Hz-20kHz, ±1.5dB; -3dB at 20Hz (anechoic). Sensitivity: 92dB/W/m. Impedance: 5 ohms nominal; 3.0 ohms minimum, 7.5 ohms maximum. Recommended amplifier power: 50W minimum into 8 ohms. Recommended listening distance: 8-25'.
Dimensions: 72" H by 12" W by 18" D. Weight: 190 lbs.