Are luxman integrated amps truly balanced?

When i use the XLR connection from the DAC to AMP its 6DB louder than SE. Was my first clue that the Luxman wasnt truly balanced. 

 XLR carries a hot signal on one conductor and an inverted hot signal on another conductor.  A diff amp compares the two signals and amplifies the difference.  A +5 volt compared to -5 volt is a difference of 10 volts.  That's the 6 dB gain.  

@audioman58 - his comment is spot on. Luxman also stopped using toroidal transformers as they claimed that they were noisy.

No Luxman uses a transformer it is colored and not accurate. On single ended it is also too warm and has a wimpy power supply.

it is Japanese McIntosh.

Shrug, I havent found it warm at all. Pretty dang neutral and clean. So maybe it's what it's being fed that matters. I'm using a holoaudio DAC. 

It’s too simplistic to say unbalanced or balanced interconnects sound better.  It’s all about the design of the gear and synergy.  I’ve had gear where I hear no difference or unbalanced sounds better but I have had gear that throughout the chain, it’s all been designed to sound it’s best balanced and all the pieces are truly balanced.  I have seen a noticeable sound quality bump on balanced gear that’s designed to be used balanced and truly balanced.  
 

Most of the time it’s easy to tell if gear is truly balanced as the manufacture goes out of their way to call that out, as already pointed out in this thread, a truly, fully balanced piece is more expensive to design and implement.  The manufacture wants you to know.  
 

Let your ears be your guide, good luck.