Build Quality9
Value For Money8
Our Score

I am usually a bit hesitant at any literary toe dipping into the cult of personality, especially when it comes to audio gadgets given the rate of tech R&D share out there but in this instance I could be persuaded to change my mind given the pedigree of a certain Jason Wei-Min Lim. Cue the Troy McClure jokes but you may have heard of him in such previous classics as Ex-CEO of NuForce (yup who has not had the uDAC at one time in their life or another) and current brains behind Heap Venture PTE Ltd whose brands include NuPrime Audio and Celsus Sound.

Unlike dear old Troy though Jason very much isn’t in retirement mode, at least not yet and with the Celsus brand he might just be onto something pretty cool that could well be ahead of the competitive curve. For his sake I hope not too soon but in any event the all new Celsus Companion One DAC is one heck of a Swiss army knife of hi-res listening options. Hi-res streaming, heck even the word hi-res, is trending heavily right now in audiophile circles and has the mainstream gadget merchants chattering on its plus and negative points. Just recently the New York Post waded into the Pono/hi-res debate with a decidedly chilly overview on the benefits of lossless to the average Joe blaming it all on the illogical OCD lust of wallet emptying audiophiles needs for perfection without any sort of grip on reality. Each to our own dream I say and after a few solid weeks with the Companion One I would take a solid $50 bet to the New York Post along with a few earphones and just say “try it!”.

What is most striking about the Companion One is that it pretty much captures just about 99% of our current listening styles in one achingly modern looking device. I am not just talking about USB and perhaps OTG and lightening compatibility and a healthy dose of lossless codecs. That has been done to death by some great units for the past few years. It is the addition of a built-in wifi network and in particular wifi streaming in hi-res mode is what makes the Companion One a very interesting device indeed, particularly if you just took out a subscription to say Spotify or one of the hi-res streaming sites that are now cropping up all over the place.

I did say achingly modern looking right? Just catch a look at that case alone in the picture below. Celsus designed this modern audio slab as an ‘on the go’ package.



The leather carry case is probably light years ahead of most “me too” satin or velvet draw string pouches you get these days masquerading as high end carry cases. The split inside is just perfect housing for a regular size 4-5″ phone (boo I have the Z Ultra) and the Companion One (2 slots). It really does scream “we thought of who might like this and we know how you want it to look”. Just for giggles I put the Oppo HA-2 in slot number 2 beside the Companion One. It felt manly, stylish, like an executive listening pack of connectivity devices. If this doesn’t find its way into an Apple Store at some point then I do not know what qualifies as stylish anymore.

The rest of the Companion One connectivity package is a simple set of white cables, much like the Aurender Flow, for connecting to the wired device of your choice and for charging the Companion One itself. One for OTG, one for Lightening iOS, a 30 pin connector for those who resisted the ‘upgraditus’ over the last few years and a USB A to USB Micro B charging cable/DAC cable for PC/Mac’s. Sadly no SPDIF or optical cable in sight which would have completed the line up in terms of all round wired connectivity. Otherwise it is a neat and tidy accessories kit with the emphasis on the unit and the ‘spiffing’ leather case with a spare screen protector and microfiber cleaning cloth.

The One is Many

No kidding this is one myriad of features housed in a very minimalist modern design. From afar you could be forgiven for thinking it is a rather thick Smartphone or iPhone given the familiar lines and curves. Close up it much bulkier than the iPhone but those lines give it a familiar feeling in your hand. You almost expect the top black screen to light up with some sort of information but it doesn’t. Instead the only digital interaction you get is at the top and bottom of that ubiquitous black panel with a 4 LED light battery indicator (bottom) and the LED mode wave form light (top) to indicate USB or Wifi. You will not be receiving any unwanted in-law’s “Face Time” calls on this device instead all you get is the Celsus One logo, albeit a classy looking logo.


The build quality is top notch though and finger friendly. One caveat is that the top panel, gorilla glass toughened and stylish as it maybe, does not have any etched labeling apart from hints on the out of the box plastic peel off cover. Take that off without familiarizing yourself with what output and input does what and you could be using that PDF manual more than you bargained for. There are no physical buttons at the top either, it is all on the sides alongside some strategically place air vents.


The physical button and input/output control on the side is a mix of the familiar and the new. To the rear you have two different micro USB inputs. The first is a universal micro USB input for charging the Companion One and the second, to the right, is a recessed micro USB for source input. To the front you have an SPDIF 3.5mm output and a 3.5mm analog headphone jack output. To the left you have a digital +/- 100 step volume control and on the opposite side you have a USB/Wifi toggle, gain and the wifi network control buttons. It is this side that will give you most cause for a careful read of the manual.

Battery Life

You can charge the Companion One via USB via your computer or any DC 5V/1250mA compatible AC and you can gauge its charge levels at any time with the 4 LED blue lights at the base of the black gorilla glass top plate. The LED lights will go into ascending blink mode 1 to 4 during the charge cycle and when charging is complete it will stop blinking and remain steady blue. The more battery you use up the lower the LED light count. Each LED accounts for roughly around 25% on the battery. Kind of like how the Cayin C5 amplifier LED system works (though they do 3 instead of 4).

When the battery hits a low point the top LED “wave form” light will go from either blue or green (wifi or USB) to red. There is no degradation of the sound on low battery it simply shuts down. Battery life is projected to play around 10 hours on average with a 6000 mAh battery packed inside but this may vary slightly depending on how you use it. You will get longer cycles on wired than wireless naturally and increased gain or output demands will lower by 1-2 hours roughly. Thankfully for those like me who nod off during charge cycles the Companion One will shut down 3 seconds after a full charge to prevent it being over charged. Just as well as it takes a whopping 8 hours for a full charge meaning basically an overnighter.

Page 2: Functionality

4 Responses

  1. SallyMaeSusan

    Please forgive me if I missed something but this is an amp as well, right?

    • headfonics

      Yes that is correct – It is a portable wired and wireless DAC and amp.


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