• Designed in Push-Pull technology, combines brutal power with sweet mid-range, exceptional delicacy, and everything one could expect from a truly hi-end equipment
• A pair of KT-120s allows easy selection of wide range of speakers
• Manually adjustable bias, reduces the noise and expands the life time of tubes
• A lovely electronic work of art, beautiful to behold and elegant all around

Sound Performance

The way Fortissimo shifts and builds a realistic musical event in the room is the most impressive thing about it. The amplifier has the level of sound quality that is unreachable for most amplifiers on the market, regardless of the price, since it preserves the very best  attributes of „tube sound", while adding extension and control in bass:

• The sound is described as based on solid, deep and meety bass 
• It shows very sophisticated midrange with clean and natural vocals 
• The sound is not overheated and the vocals are phenomenal 

The most impressive thing about it is that, while listening to it, you have a feeling the musicians are playing only for you, in your room. You can easily hear all the ancillary noises made by the cellist, mainly breathing and an occasional sigh. Interestingly, these human noises are distinctly separate from the cello in three-dimensional space, hanging somewhat above and in front of the instrument.

The other area in which the Fortissimo strutted its stuff, is in its ability to cast a lovely glow on the midrange, while placing just enough music to liven up the sound of the speakers.

Bias Adjustment

The output tubes need to be biased at initial setup and after the amplifier have gotten warmed up a bit. It is an easy task involving turning small potentiometers, located on the top plate and behind the tubes. Once adjusted, tubes retain their desired bias current for some time, but it can be re-adjusted if necessary.
A small miliampermeter on top plate shows values for each tube separately ( V1, V2, V3, V4 ). When the stable value 55 mA is reached, measuring can be repeated after 1 hour.

Design

Fortissimo is a perfect example of a hi-end tube amplifier made in a truly uncompromising manner, designed with a lot of courage and no visible restrictions. It is also an electronic work of art, where each element is refined and beautiful. 
The huge casing is made entirely of metal, adorned with wooden side panels with the company logo. The amp is equipped with an input selector, volume control, remote and a basic system of setting the output tubes bias. At the back, there are three unbalanced input and one XLR input, loudspeaker outputs with 4 and 8 Ω terminals and a three-bay power socket with the main switch.
If you happen to encounter one in a room loaded with gear, your eyes will leap at Fortissimo.

Testimonials

„The first listening test literally punched me into the floor. The loudspeakers exploded with dynamics and huge soundstage. Fortissimo needed thirty minutes to convince me it's one of the best amplifiers I ever reviewed. That's just the fact." - Tomasz Karasinski, StereoLife Magazine

„I throughly enjoyed my time with the AurisAudio Fortisimo, and if you are in the market for such a product in the price range, I reckon you might enjoy too. It‘s a top-flight product well worth seeking out, so I‘d advise you to get right to it!" - John Richardson, Part-time Audiophile