Luxman L-505uX versus L-507uX

FAQs | Applies to: Luxman L-505uX Integrated Amp
Luxman L-507uX front view

I'm interested in purchasing an integrated amplifier. What are the key differences between the Luxman L-505uX and the Luxman L-507uX?


Both amplifiers come with a remote control. The principal difference between the two amps is in the refinement. The difference in sound quality between the two is dramatic and is heard in tonal color, texture, depth and width of sound stage. The L-507uX's refinement is not subtle, considerably more resolute & delivers much more tonal color and dynamics than the L-505uX.

The L-507uX uses a more powerful power supply than the L-505uX with the ability to drive lower impedance loads. You will find that the power output difference into 8 ohms is inconsequential. However, into 4 ohms, the L-507uX is considerably more stable and powerful into low impedance loads.

From a value standpoint, while the L-505uX is clearly the better value from a dollar standpoint, the L-507uX is dramatically better sounding and truly delivers high-end separate performance. The L-507uX uses higher quality parts internally, nicer casework and as a result is over 4 lbs heavier.

One of the main differences is in the transformers:

  • First off, it is safe to say that the Japanese build some of the best transformers and Luxman has been designing/winding transformers since 1925 and has a very good handle on these devices.
  • The El transformers in the L-507uX are more expensive to produce than the Toroidals in the L-505uX. They are also more time-consuming to make because of bobbins and the need to optimize winding space. Toroidals weigh about half of what El transformers weigh for the same VA rating.
  • Since Toroidals have extremely good high frequency response, they may let more line noise through. They often have a high in-rush current (can be hard on power switches) and they can be disturbed by the tiniest bit of DC on the power lines.

In Music,
Philip O'Hanlon

Applies to: Luxman L-505uX Integrated Amp