The Triangle I20 integrated amplifier represents a compelling proposition in the high-end audio market. This 70-pound behemoth, boasting a sleek piano black finish, delivers a listening experience that belies its understated exterior. A meticulously crafted internal design, showcasing premium components like Mundorf capacitors and a robust PCB, speaks volumes about Triangle Art's commitment to quality. This review delves into the performance and build of the I20, exploring its strengths and limitations within the context of its $12,500 price point.While the included tubes are adequate, the I20's true potential shines through its exceptional sound signature. We explore its remarkable midrange and treble clarity, detailed imaging, and immersive soundstage. However, its 20-watt output and less forceful bass response might not cater to all listening environments or speaker preferences. This review will assess whether the I20's unique blend of refined sound, precise imaging, and superior build quality justifies its hefty price tag and its place among the best high-end integrated amplifiers.
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Unboxing and First Impressions
The Triangle I20 arrived as a substantial package – 70 lbs of pure audiophile goodness. The piano black finish is sleek, although some might find the exterior design a bit understated compared to the luxurious innards. The initial setup was straightforward, with clear labeling and easy-to-use controls.

The included JJ and Tung-Sol tubes are decent, but given the $12,500 price tag, higher-quality tubes straight out of the box would have been a welcome addition. Despite this, the initial sound quality was already quite impressive.
Internal Build Quality and Components
Peeking inside the I20 reveals a meticulous design packed with top-tier components. Mundorf capacitors dominate the circuit board, a testament to Triangle Art's commitment to quality. High-quality resistors and a robust 2.5mm thick PCB with 4 oz solid copper further enhance the build quality.

The internal craftsmanship far surpasses the relatively plain exterior. This level of attention to detail is seldom found in similarly priced integrated amplifiers. The construction feels solid and substantial, reinforcing the sense of high-end quality.

Sound Quality and Performance
The Triangle I20 delivers a refined and detailed sound signature. The midrange is exceptionally smooth and non-fatiguing, effortlessly handling various musical genres. The treble is equally refined, sparkling without harshness.

While the bass response isn't the most impactful compared to solid-state counterparts, it retains impressive texture and extension. This warmth and inviting soundstage contributes to the overall listening experience. The deep soundstage is one of its key strengths.
Imaging and Soundstage
The I20’s imaging precision was a pleasant surprise. Despite the expansive soundstage, instruments were sharply defined and precisely placed, a quality often lacking in SET designs. This level of detail rivals even some similarly priced solid-state amplifiers.

The combination of a vast, engulfing soundstage and pinpoint imaging makes the I20 exceptionally captivating. This ability to create a realistic and immersive listening experience is one of its key differentiators.

Overall Conclusion and Recommendation
The Triangle I20 is not for everyone. Its 20-watt output and relatively gentle bass response might not suit listeners with large rooms or power-hungry loudspeakers (below 90dB sensitivity). Those seeking the ultimate bass slam will also want to consider alternatives.
However, for audiophiles who appreciate a refined, detailed, and immersive listening experience from high-sensitivity speakers, the I20 shines. Its exceptional midrange and treble, deep soundstage, and precise imaging make it a compelling choice in the high-end integrated amplifier market. The build quality and the ‘made in the USA’ aspect are further selling points. Despite the cost, its unique combination of qualities makes it a worthy contender.