Lumin, Leedh’ing the way

greyowl07 said:
I would like to acquire the Lumin U1 or X1 & use the Leedh processing volume control (no pre-amp). Is it possible to use a hand held remote for volume in such a set-up? The remote would be for an external Dac or the Dac within the X1 (if available). If not, how does the volume level control within the Lumin app compare to a hand held device? Thanks.
Click to expand...
You can either use the volume control from within the Lumin iOS/Android app or get the optional Lumin IR control package.
 
Thanks for replying. I'm not clear about how would an IR remote work with a transport only component like the U1? Would the Leedh still be functional with the use of such a remote? I'm looking at the U1 connected to a dac with Leedh on in the app. Would an IR remote be applicable in such a setting? Thanks.
 
Yes.

The (separately purchased) Lumin IR remote package has a USB receiver to be plugged into the Lumin transport or player.

On receiving a volume command from IR remote / Lumin app / Roon / Tidal app / Spotify app / AirPlay / UPnP app, the Lumin transport or player applies Leedh Processing Volume. If it is a transport for digital output, the volume is done digitally and the output bitstream reflects that. This volume-adjusted bitstream is sent to the DAC.
 
Currently using the Leedh Vol control of Lumin going straight into the DAC of Hegel H90 in home theater mode (@unity gain). More vibrant than the amp's vol control! Well done & well implemented dear Lumin!
 
By the way, on Roon forum there are multiple Hegel users with Lumin T2.
 
Hi
I just purchased X1 with remote control, It’s on the way.
Can I use X1 directly into my power amp which has relatively ( compared to Lumin AMP) low input impedance of 30K ohms.?
But it has reasonably good gain of 28db.

Here are the specs of my amp
KA S180Mk2

Fully balanced dual mono power amplifier. 2x180W (8 Ohm) in class A

Channel separated power supplies from a 680 VA toroidal transformer, 80.000 micro Farad filter bank and four stages of stabilisation
Frequency response DC – 300kHz +0, -3 dB
Signal to noise ratio better than -112 dB
Intermodulation distorsion less than 0,03% at rated power into 8 Ohms
Gain is 28 dB
Pink noise min RMS Power 180/300W into 8/4 Ohms (not recomended for loads under 3 Ohms)
Input impedance 30 kilo Ohm

And my speakers are 8ohm 91db efficiency.
 
From Lumin + Leedh Digital Volume control - Digital Sources, DACs, and Computer Audio - StereoNET International
I have a PS Audio BHK Signature preamp which I thought just “wasn’t right”. I placed it on Unity Volume (77) and turn on Leedh Volume on my U1 Mini. The change was so much more significant than I would have thought! When I tried initially running my DAC directly to the power amp, it sounded thin. Now it’s running through a proper preamp with all its input gains and transformers, the sound is full, voices clear and trebles have lost the brittleness. WOW!
Click to expand...
 
If unity gain is not specified in the preamp manual, please turn up the preamp volume, and turn down the Lumin Leedh volume. However, if you also use the preamp for other sources, then you must turn down the preamp volume before you switch to other sources, otherwise there would be a risk.
 
For roughly 18 months, I've had my Lumin T2 connected to my McIntosh C2600 preamp via XLR, which was then connected to my McIntosh MC275 amp via XLR. Both have had a small amount of tube rolling to taste.

I was 100% happy and content with the sound I was getting. Thrilled actually.

Over our recent holiday break I experimented a bit...

I pulled the C2600 out, and now have my T2 directly connected to my McIntosh MC275 via XLR.

I turned on the Leedh feature, fiddled a bit with the Max Volume setting (a nice feature all by itself, BTW), and the Lumin app volume control (the Circle).

I tried very hard to have zero expectations; trying to avoid confirmation bias... if anything I was probably looking to justify my preamp's existence.

Going without the preamp resulted in more detail, cleaner highs without affecting the bottom end or the mids. Lifting of the proverbial veil. The difference is astounding, and was immediately evident. I'm literally flabbergasted by the difference.

Adjusting volume via the app is a bit klutzy as I don't always use the Lumin app (Thankyou Tidal Connect).

My Lumin remote kit is on order. The C2600 will likely be for sale as the T2 is my only source.

I'm a little late to this party, but props to the folks from Lumin.

Editorial Feature Request: Quboz Connect, then I can discontinue Tidal and their MQA nonsense.
 
Re: Leedh Processing Volume free upgrade

One question:
I am using Roon with lumin X1. If volume control in Roon is activated (with Leedh activated as well in lumin app), does that mean the volume control in roon using Leedh algorithm?
 
Yes, the Lumin volume in Roon is done using Leedh processing. In the next firmware you'd actually see "Leedh" in the Roon signal path.
 
Lumin Firmware 15 added analog output balance control to our models with ESS DAC chips (X1 P1 T2 S1). To the best of my knowledge, we are the first manufacturer that makes of use Leedh Processing Volume to provide balance control.
 
Thx Peter.
Am I the only who can’t find the setting after upgrading the firmware?
App is up to date as I write this.
 
Android app has already been released. iOS app is waiting for Apple approval.
 
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