What is the difference between Luxman’s L-507u and L-507uX?

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Luxman L-507uX front view

What is the difference between Luxman's L-507u and L-507uX?


Answer:

Tonally both amplifiers are voiced the same by Hashimoto-san at Luxman, Yokohama. It is a noticeable improvement over its predecessor, both sonically and in use.

Sonically

The L-507uX has a sweeter, more liquid mid-range and a more three dimensional soundstage is thrown. It is more refined, more detailed and even nicer to use than before.

Features

Both amps have most of the same features:

• The L-507uX has a discrete volume control based on the C-1000f preamplifier design – no moving parts, no tracking issues at low volume. Much more transparent sounding and will not sound the same at every level. This is the most important of all the upgrades and the most expensive to implement, as the individual resistors need to be measured by hand.

• The L-507uX has MONO, SUBSONIC (Rumble) & LOUDNESS Filter switches on the remote control, Loudness is a wonderful feature for late night, quiet listening. It also has a few buttons that support the D-05/06/08 CD SACD players basic functions.

• The L-507uX has a SEPARATE switch for splitting the preamp section from the amp section, for example the inclusion of a Home Theater Processor, where you use the amp in the L-507uX to drive the front L+R speakrs, but control the volume from the HT Processor.

• The L-507uX has a newly redesigned phono stage, which is both more refined & musical.

• The L-507uX has ODNF 3.0 performs three passes of the audio signal, checking for noise & distortion, while the ODNF 2.1 in the L-507U does two passes.

Chassis

There are only a few differences between the two amps.

• Both the L-507uX and the L-507u come with a metal remote control.

• The volume control and the selector knobs have a more tactile feel to them.

• The L-507uX has the speaker terminals spread out horizontally to allow easy access for large cable.

• The L-507uX no longer has the Line Phase Sensor – it does not comply with CE regulations..

• The L-507uX now has LINE STRAIGHT (engage / disengage the tone controls) & SEPARATE available on the remote control. There is no excuse for not using the tone controls, especially when they can be engaged / disengaged from the comfort of the listening chair.

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by Philip O'Hanlon

Music Evangelist and Master of Musical Enjoyment—Philip spends his time looking for fine music, tuning up synergistic electronic components to get the best sound, and making music compilations so he can share his listening journey and experiences with friends and acquaintances.