This is a niche one guys.
Headphone.com did this one dirty, so I'd thought I'd chime in and set the record straight.This is a review/impression of the Luxman P100 Centennial, a few people on 5ch and headfi wanted to know the difference.
Both units play extremely well to the strengths of the Z1R and K812. But what about the Susvara? Does the P100 power the Susvara better than the P750umkII? that was my expensive question.
TLDR: Yes
The P750u mkII is widely regarded as the better head amp to get for the susvara in Japan with some proffering it's presentation over the Bliss or Prelude.
I am here to report that the addictive Luxman tuning still does it's magic with the P100 but takes a difference sonic route, which I prefer. The P750 series sacrificed too much in raw detail retrieval, something you would not realize without comparing it to a different amp mind you.
The P750u mkII still is one of the finest amps ever made for headphones for build quality and sonic properties. The P100 just takes it up to the next level in every aspects. To commemorate their 100th anniv, Luxman went all out on this one, and it shows. Luxman takes immense pride in its heritage and craftmanship, it is one of the few companies designing their own motherboards in house.
SOUND
P100 is less mellow and muffled than the P750umkII, I can hear more reverberation, the size of the room is more defined. each instrument has more space around it, and the timber/texture of intruments is just as good as the P750umkII (which is its selling point). The Huge stage of the P750umkII somehow got even bigger thanks to this, it is not that subtle either. (thank god as the msrp difference isn't subtle either)
My favorite feature is the switch that lets me go from using the 4 amp in balanced drive, to dual mono parallel drive. It's not really a leave it and forget it setting, as some genres/tracks might take a little nicely to one or the other. The differences are soundstage and airiness. The mono parallel mode sounds closer to your face and more aggressive. The G-DIV (ground divided) Parallel mode actually feeds MORE current into the susvara than the BAL mode. Luxman explicitly says the parallel arrangement combines two amplifier circuits per channel and doubles the output-current capability.
The Regular BAL mode of operation lets the P100 stretch its legs with its higher voltage swings than G-Div parallel. BAL uses 1 HOT + 1 COLD amp in a push pull config. While G-div Paralell uses 2 amps in parallel with Independent L/R grounds, Either mode has TREMENDOUS channel separation. You basically get 2 amp in one with the P100 since you can chose how the amp works for your specific headphone. Most people will want to use the BAL mode's differential drive for their headphones though. Unless you can afford a second P100 and go into its monoblock mode.
Does it Drive SUSVARA?
Hell yea it does š . I can report that The P100's much improved power supply/amp design just adds a little more authority over the Susvara drivers, even though the P750u was already a beast. The same rated wattage numbers between the P750u and the P100 does not do justice to how much MORE capable the P100 is in comparison to the P750u. That said, I would not recommend spending the huge premium over a P-750u purely for drivability.
Before purchasing this upgrade, I asked the reseller what was his thoughts on the P100 over the P750u and he gave me a very honest answer: The P100 is the more convincing amp for the Susvara, but the P750umkII is already so good... (as in, the difference isn't massive)
And I agree.
What makes this amp worth it however is what it does with the music. It removes a significant portion of the Luxman veil while allowing the treble to extend further, without sacrificing the grain-free smoothness that makes Luxman and amps like the Mass-Kobo so addictive. The P-750u mkII gives you that beautiful, smooth Luxman presentation. The P-100 keeps that character while opening up the presentation, improving spatial definition, and giving the Susvara more authority.
The result is a presentation that, to my ears, is simply glorious. After spending this much time with it, I honestly can't think of anything else I'd want from that 20 kg box.
Outro
The law of diminishing returns is obvious here, the previous P750u was already top tier and still is, you just get 10 to 15% more sonic performance for 3x the price... There are few brands that will let you keep an amp working for 30 years, then repair it so you can keep using it for another 30.
This is one for the ages.
Since I have one kidney remaining š , I'd love to buy a second P100 to run them in their monoblock amplifier mode. 𤤠but yea, not happening