January 2026

Vitus Audio SIA-025 Mk.II Luxury Hi-Fi Int. Amp — The Definitive Review
A masterful and musically satisfying experience that had me magically mesmerized.
Review By Dr. Matthew Clott

  Caveat: Yes, the Vitus Audio SIA-025 Mk.II solid-state integrated amplifier, as reviewed here, has been out for many years. So why review it now? Well, for starters, wouldn't you say yes if you were asked to review it?!? Secondly, I think that with the introduction of some new similarly-priced integrated amplifiers and a new interest in truly reference high-end audio performance at this level, it would be irresponsible of us here at Enjoy the Music.com not to remind you that the new stuff is not always the best.

Sometimes we must look to the established to reinforce what our references actually are.

Thirdly, sometimes a review after a unit has been out for some time helps to re-evaluate its place in the market as its price matures with the flow that has represented the high-end audio world in recent years.

Vitus Audio's founder, Hans-ole Vitus, fell in love with music at the ripe old age of 12. That passion developed into a lifelong obsession with audio perfection as he matured. Vitus Audio grew from tinkering in 1985 to unofficial founding in 1995. In 2003, Mr. Vitus released the RP-100 phono stage, the RL-100 line stage, and the SM-100 mono power amp at the Stockholm Audio Show. The Reference and Signature series equipment was slowly released over the next six years, with recognition of exceptional performance from media and audiophiles the world over, and in 2009, the Masterpiece Series MP-P201 phono stage was announced.

In 2010, the opportunity arose to condense the circuit designs of the Signature series amp, line stage, and phono stage into a single chassis using the newly acquired Solidworks Design software, and Vitus' first integrated amplifier was born. In 2019, the SIA-030 integrated was released and proved to the world that truly reference-level did not always require isolated components. Eventually, the SIA-025 matured into the Vitus Audio Signature Series SIA-025 Mk.II integrated amplifier with the introduction of an improved volume control relay and incorporated the output stage from the SM-10 monaural amplifier. The circuit design became more refined, shortened the lengths of signal flow, condensed the chassis, and heightened the overall performance.

Speaking of the chassis, let us speak of materials and manufacturing befitting royalty. Vitus Audio does not make inexpensive equipment, and the quality of manufacturing represents what one would expect of an expenditure of that level. Beautifully beveled aluminum, meticulously crafted and luxuriously designed, the SIA-025 Mk.II integrated was a pleasure to look at and to interact with, either on the front of the unit or from its equally well-done remote control.

Control And Tech Specs
The remote control for the Vitus Audio SIA-025 Mk.II stereo integrated amplifier allows control of every unit in the Vitus line-up and requires infrequent charging to keep my butt in the listening chair, where it belongs; I charged it when it arrived and did not have to charge it again during its many months in my domicile. The unit offers five inputs total, both XLR balanced and RCA unbalanced, as well as pre-amplifier output to bi-amp, a full bypass function, and balanced speaker outputs. Technically, the Vitus amps and integrated offer full class A and Class AB output, easily switchable from the remote. The unit produces 25 Watts per channel (Wpc) into 8 Ohms, Class A, and 150 Wpc in AB. And to answer that question quickly and easily, I listened almost exclusively in Class A. I preferred AB when dynamics, bass, and putting some stomp in my romp were a priority, but for butt to listening chair long-term ecstasy, it was class A all the way for this reviewer's eardrums.

While it sounds silly to comment, I must commend the quality of packaging as well as the fact that the unit functioned flawlessly from unpack to goodbye. With electronics, that is simply not always the case. Handcrafted in Denmark is all over the packaging and marketing material, and I think it truly means something. From packaging to front panels, and from heat sinks to the press of the buttons, Vitus components feel bespoke, luxurious, and truly handcrafted. For an upcharge, you can select Dark Champagne, Titanium Grey, or Titanium Orange; man, I wish they sent me the orange one!

To recognize the extent of their obsession, let us look at the not-so-simple volume control topology. Vitus uses a series of fixed resistor networks with relays utilized to switch between the networks. A fixed resistor is in series with the signal path of all volume steps. As you change the volume, a different number of shunt resistors is used. The result is minimal signal degradation at a point many units struggle with or solve less elegantly.

SoundSational
But what of the sound of Danes, you ask? Vitus designers highlight musical performance over technical detail and measurements; listen first, measure later. They focus on neutrality, detail, and dynamics on a clean, low-noise background with spatial expansion and image density. That sounds like marketing hoo-hah, except it's not; those were pretty much exactly what my listening notes defined as my time with the Vitus Audio Signature Series SIA-025 Mk.II integrated stereo amplifier progressed.

My reference amps are Lamm M1.2 Reference Class A Monoblocks. They do things no other amps do, the way they do, and how they do; don't know how or why, they just do. I made the transition during my time with the Vitus from my Lamm's powering my insane value for money Rockport Atria 2 speakers (with Rel six pack) to the Vitus powering the Atria 2's, and then welcoming the Rockport Lynx speakers into my home. The Lynx are quite simply amongst the best transducers I have ever heard, and they are electron microscopes to everything upstream. The Lynx threw down the gauntlet, and the Vitus Audio SIA-025 Mk.II  yelled at the top of its' Dane lungs, "Bring it!" Or whatever the Danish translation of that is!

From a cost standpoint, the Atria 2 at $38,000 per pair makes a perfect match to the Vitus SIA-025 Mk.II's $33,600 retail price. And would make one hell of a compact, knock your socks off system! While I respected the superior performance, accuracy, massive stage, and immense presence gained by adding a pair of almost $80K Rockport Lynx speakers, I actually and honestly felt the Atria 2 was a better mate to the SIA-025 Mk.II. The Lynx is very revealing, and while I never felt the Vitus to be overly analytical, the scanning microscope that the Lynx is tested the 025 Mk.II to its limits, and was just a bit more than the 025 could chew (this is in no way an insult to the Vitus). Plus, quite simply, the Lynx need more power than what the Vitus Audio SIA-025 Mk.II can render, especially Class A.

I would imagine the Vitus Audio SIA-030 and the Lynx would blow the mind of the listener. Since I have sadly never heard an 030 (hey Vitus, did you hear that?) I can not declare that statement as fact, just a presumption. That all said, I listened extensively with the Vitus and the Atria 2 before the Lynx arrived, and then again extensively with the Vitus and the Lynx. Both proved to me how seriously top-tier the SIA-025 Mk.II truly is.

In regard to my Lamm amps, I feel that they represent otherworldly musical engagement. I was blown away at how frequently, during my time with the Vitus, I did not miss my Lamm amps. In many cases, I can appreciate the performance and prowess of whatever I am reviewing, but I just can't wait to get my Lamm's back in to settle into music without anything in its way. The Vitus does what my Lamm does; differently. Like completely differently! But it still did it; or at least gave a serious taste of it.

Vitus Audio's SIA-025 Mk.II Draws You Into The Music
Call it psychoacoustics, call it engagement, call it musicality, call it pepperoni pizza... the Vitus Audio Signature Series SIA-025 Mk.II integrated amplifier draws you in, engages and enraptures, and then transports you to that place we all want to go and forget everything but what's on the recording. The Vitus SIA-025 Mk.II made me emotional time and again, like tearing up or laugh-out-loud (LOL) silliness. I dug deep into my CD pile and reached all the way into Qobuz lossless Hi-Res Music to find whatever was next; it didn't matter. As long as something was next! As always... enjoy the music.

Making Music Sound Sensational
Sonically, the Vitus represents its origins. It is musical, engaging, wonderfully dynamic (in both class A and AB), texturally unrestricted, and throws a stage as wide as the Grand Canyon. I found that I had fewer listening notes for the Vitus than for most of the gear I review, most likely because I just spent so much time listening. On occasion, I spend more time discussing how a component or speaker made me feel than what it sounded like. I acknowledge that when given the opportunity to review the Vitus, I jumped out of my seat to say yes. I wanted to hear this integrated. I actually wanted to hear the Vitus Audio SIA-30, but when offered a Ferrari 296GTB, you don't ask for the 849 Testarossa... And like the 296GTB, I was certainly not disappointed with the Vitus Audio SIA-025 Mk.II solid-state stereo integrated amplifier.

I found what I expected to find, that Vitus Audio's Signature Series SIA-025 Mk.II integrated was a touch underpowered to play with the over $70K speakers that come in and out of my room for review, and that the new high $20K to high $30K class of integrated amplifiers that are now available can stand at the top of their game competing with separates of equal cost and allow a significantly simpler system with less accessories/cables and more focus on just listening. that is how the 025mkII made me feel most of the time, like I just didn't need more. Considering what I have and what I have access to, that is saying a lot. The power output of the 025 was more than sufficient to drive most anything one would logically mate the integrated with, especially with some consideration to speaker sensitivity and prioritizing the Class A output option. Keeping in mind that 50 Wpc into 4 Ohms in pure class A is enough to power most speakers without difficulty, do not let the "low power" spec fool you.

I can say that Vitus Audio's Signature Series SIA-025 Mk.II integrated stereo amplifier, as reviewed here at Enjoy the Music.com, always utterly satisfied, frequently mesmerized, and constantly made me forget I was supposed to be reviewing! I have heard most of the over $25,000 options in the Integrated sector and can say with certainty that it would be on my personal short list to consider the Vitus Audio SIA-025 Mk.II integrated for permanent residence; and the other integrated amplifiers on my list cost quite a bit more. If you are in the market, put the SIA-025 Mk.II at the top of your list; it's just so good.

Specifications
Type: Solid-state integrated amplifier
Frequency Response: 1 Hz to 800 kHz
Signal To noise Ratio: >100dB @ 1kHz
THD + Noise: <0.01%
Inputs: Three balanced XLR and two unbalanced RCA.
Sensitivity: 2, 4, and 8 VRMS
Impedance: 10kOhm balanced
Outputs: Balanced XLR and unbalanced RCA
Output Impedance: 0.075 Ohm balanced XLR and 33 Ohm unbalanced RCA
Power WRMS: 25 Watts Class A / ~150W Class AB @ 8 Ohm
~50W Class A / ~300W Class AB @ 4 Ohm
Volume Control: Relay controlled fixed resistor network
Volume Steps: -81dB to +11dB in 1dB steps
Dimensions: 135 x 435 x 436 mm (HxWxD)
Weight: 37 kgs
Price: $33,600

Manufacturer
AVA Group A/S,
Hammershusvej 3L,
DK7400 Herning,
Denmark

Website: VitusAudio.com

U.S. Importer
Luxury Audio Group
Voice: (725) 772-4589
E-mail: aldo@luxuryaudiogroup.com 
Website: LuxuryAudioGroup.com