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Authorized dealers for Alexus Audio 845SE Single-Ended Class A Power Amplifier

  • Salon One Audio — in-store — Ormond Beach, Florida, United States (website)
Alexus Audio 845SE Single-Ended Class A Power Amplifier #1
Alexus Audio 845SE Single-Ended Class A Power Amplifier variant 1

Alexus Audio 845SE Single-Ended Class A Power Amplifier

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Alexus Audio’s 845SE monoblocks deliver a rich, harmonically textured Class A presentation, combining warm piano body, sonorous brass and satisfying bass bloom. Audiophilepure also heard stable image placement and an involving, groove-led sense of musical density. With 50W of parallel single-ended 845 power, these are compelling partners for sympathetic high-efficiency speakers.

View at Alexus Audio
Specifications2 reviews & sources

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85/100
Rating for 845SE Single-Ended Class A Power Amplifier

Nicely Roasted

Sound Quality

84/100

Build Quality

86/100

Value for Money

85/100

Pros

Rich instrumental tone with warm piano body, sonorous brass and rewarding overtones.

Strong bass bloom and dense, meaty musical momentum that brings the groove to life.

Stable spatial focus, with centrally placed cymbal details holding firmly in the soundstage.

Cons

Can sound overly dark and dense in an unsuitable system, so careful speaker and component matching is important.

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What Reviewers Are Saying

"The 845SE’s show warts and all, they give you what you give them."

— Audiophilepure

SOUND QUALITY PERFORMANCE 84/100

The available listening report finds a richly textured, spatially stable presentation with appealing instrumental color. Its warmth and density can be highly involving, although the reviewer found the balance too dark and dense in one associated system.

Transparency Resolution

84/100

The reviewer says the 845SE will "show warts and all" and gives listeners what they feed it, suggesting an honest, revealing character. There is limited direct commentary on fine-detail retrieval, air, or background silence.

Tonal Balance Musicality

82/100

The amplifier brought warm piano body, rich textures, overtones, sonorous brass, and a sweet cymbal ring to the recording. However, the reviewer also found it overall too dark and dense with the system used, making component matching important.

Dynamics

86/100

Music was described as thick, meaty, dense, and full of rewarding texture, with the performance strongly illuminating the groove. The review does not directly assess large-scale transient attack, low-impedance control, or composure at very high levels.

Soundstage Imaging

84/100

A cymbal tap placed at the center of the image held a strong, stable position in space. Beyond that observation, the review says little about stage width, depth, or image layering.

Assessments of Build Quality, Usability, and Overall Propositions.

Build Quality

86/100

This is a substantial 50kg pure-Class-A monoblock using parallel single-ended 845 output tubes, with selectable 4- and 8-ohm speaker taps. Its 350W power consumption and dedicated monaural architecture indicate a serious implementation, though the review offers little direct comment on chassis finish, reliability, or long-term ownership.

Value for Money

85/100

The review identifies a $16,995 asking price, placing the 845SE among costly specialist tube monoblocks. None of the supplied review material directly compares its value against competing amplifiers or states whether its performance justifies that price.

Reviews & Sources

Professional reviews and sources for this product's Watt'n Potatoes analysis.

Online Reviews & Mentions

YouTube Reviews

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Specifications

Amplifier Type
845 parallel single-ended, Pure Class A monaural
Model
845SE
Power Output
50W @ 1kHz, 0.5% THD – perfect for high-efficiency speakers
Frequency Response
10Hz – 30kHz (+/- 1dB) for deep lows and shimmering highs
Input Impedance
RCA unbalanced / 100kΩ for seamless integration with preamps
Speaker Output
Switchable between 4Ω and 8Ω for flexibility with various speaker types
Gain
28dB to deliver precise control and headroom
Vacuum Tube Complement
845 x 2: Iconic power tubes renowned for their sonic purity and richness 300B: Adds musicality and depth 6S45P: For exceptional signal stability and detail retrieval
Power Consumption
350W
Dimensions (W x H x D)
320mm x 370mm x 458mm – a compact yet commanding presence
Weight
50kg, showcasing its robust build and premium materials
Balance Control

Manufacturer's Description — Alexus Audio

The 845SE represents the pinnacle of single-ended amplifier design, delivering extraordinary warmth, detail, and dynamic range. Crafted for audiophiles who demand uncompromising sound quality, this Pure Class A amplifier combines cutting-edge engineering with timeless vacuum tube technology to provide an unmatched listening experience.


Designed to drive even the most demanding speakers with finesse, the 845SE’s parallel single-ended configuration ensures exceptional clarity and tonal accuracy. Each component has been carefully selected to optimize performance, making this amplifier a true statement piece in any high-end audio system.


The 845SE Mono Blocks are designed not just as amplifiers but as instruments that elevate your music to new heights, ensuring every nuance is faithfully reproduced.


Rediscover your favorite music with the timeless elegance and performance of the Alexus Audio 845SE.


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Authorized dealers for Alexus Audio 845SE Single-Ended Class A Power Amplifier

  • Salon One Audio — in-store — Ormond Beach, Florida, United States (website)
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