Classé Audio Delta MONO
Combining Class-A finesse with formidable high-current control, the Delta MONO delivers deep, tactile bass, fluid midrange warmth and remarkably clean treble without sacrificing transparency. Aron Garrecht found its poised, large-scale performance competitive with far costlier monoblocks, while its quiet ICTunnel cooling and CAN-Bus integration make this a seriously accomplished reference-grade powerhouse.
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Deliciously Crispy
Sound Quality
95/100
Build Quality
90/100
Value for Money
94/100
Pros
Deep, tightly controlled and tactile bass combines with substantial perceived headroom and composure at high volumes.
Transparent, harmonically rich midrange and smooth, detailed treble create an unusually refined yet revealing presentation.
Excellent image focus and soundstage depth, with a relaxed sense of ease even during demanding musical passages.
High-current output is well suited to difficult low-impedance speakers, backed by strong measured power delivery.
Cons
Despite its premium appearance, the enclosure feels less materially substantial and vault-like than some similarly priced rivals.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 95/100
Reviewers consistently describe an unusually open, refined and powerful presentation, combining fine tonal detail with commanding low-frequency control. It remains composed at high levels while producing sharply focused images and convincing depth.
Transparency Resolution
96/100
Stereophile found the Delta Mono's transparency addictive, praising its impressively transparent midrange, clean smooth highs, and ability to reveal spatial differences even in compromised source material. SoundStage likewise heard extra audience detail, cymbal definition and shimmer without splashiness.
Tonal Balance Musicality
95/100
The amplifier is repeatedly characterized as beautiful, refined and musically natural rather than merely analytical. Reviewers heard harmonically complex piano, voices with body and scale, and treble that stayed smooth and clean while preserving bite and color.
Dynamics
96/100
There is strong agreement that the Delta Mono delivers effortless authority: Stereophile reported bass synths filling the room with ease, while SoundStage praised its substantial perceived headroom and surefooted behavior at demanding levels. Its 300W rating, substantial power increase into lower impedances, and measured 950W clipping output into 2 ohms support its suitability for difficult loads.
Soundstage Imaging
94/100
Stereophile heard superb image acuity, tightly focused central images and excellent stage depth. SoundStage found stage size competitive with far costlier reference monoblocks and praised the natural decay of vocal reverb into the room.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
90/100
The Delta Mono uses a serious high-current monoblock platform, with an actively regulated internal cooling tunnel designed to keep output devices at their intended operating temperature; measured testing found the chassis cool after extended use. SoundStage particularly liked the binding posts and CAN-Bus control integration, though it also felt the casework was less vault-like and materially substantial than some premium rivals.
Value for Money
94/100
At $21,998 per pair in the Stereophile review, the Delta Mono is undeniably a premium purchase, but SoundStage considered it less expensive than its principal comparison amplifiers while sounding better in that system. That reviewer gave it an unequivocal Reviewers' Choice recommendation and described performance competitive with considerably pricier monoblocks.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
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Specifications
- OVERALL DIMENSIONS
- Width: 17.50 in (444 mm) Depth: 19.37 in (492 mm) Height: 8.74 in (222 mm)
- WEIGHT
- Gross Weight: 111.6 lbs (50.6 kg) Net Weight: 97.7 lbs (44.3 kg)
- GENERAL
- Frequency Response: (-3dB, 50Ω source impedance): 1Hz – 650kHz Continuous Output Power: (at 1kHz, 0.1% THD+N): 35W / 8Ω (Pure Class-A Operation) 300W / 8Ω 600W / 4Ω 1000W / 2Ω (with AC line held constant) Harmonic Distortion: (measurement bandwidth: 500kHz, 25Vrms in 4Ω or 8 Ω): <0.0016% at 1kHz <0.0018% at 10kHz <0.0028% at 20kHz Harmonic Distortion: (measurement bandwidth: 90kHz, 25Vrms in 4Ω or 8 Ω): <0.0005% at 1kHz <0.0006% at 10kHz <0.0015% at 20kHz Peak Output Voltage: (nominal AC line): 148Vp-p into 8Ω 156Vp-p no load Input Impedance: (at 1kHz, BAL / SE): 82kΩ Voltage Gain: (at 1kHz, BAL / SE): 29dB Intermodulation Distortion: (SMPTE 4:1) (8Ω or 4Ω, BAL / SE): <0.001% Intermodulation Distortion: (CCIF) (8Ω or 4Ω, BAL / SE): <0.002% Signal-to-Noise Ratio: (A wtd in parenthesis) (22kHz BW): 117dB (119.5dBA) Slew Rate: 72V / μs Output Impedance: 0.01Ω (100Hz), 0.011Ω (1kHz), 0.015Ω (10kHz) Damping Factor: (at 1kHz, ref 8Ω): 700
Manufacturer's Description — Classé Audio
Delta MONO embodies exquisite, controlled, unending power.
A perfectly detailed enclosure cradles a highly innovative blend of technologies and hand-selected components which deliver effortless, refined sound.
AMPLIFICATION
Delta MONO is crafted for exceptional performance and durability – every detail superbly refined. The first 35W of power are pure Class A, and with over 300W per unit total (1,000W @ 2Ω) at its command, Delta MONO will confidently control any loudspeaker.
- Up to 35W delivered in pure Class A operation
- 300W per unit total
- Massive, high-quality power supply
- Custom toroidal transformer
CLARITY
Delta MONO delivers the utmost clarity in everything you hear. Every detail communicates natural, authoritative sound. An expansive dynamic range with infinitesimal noise delivers unsurpassed fidelity to the musical source. Start listening.
- Hand-laid circuit boards
- 6-layer circuit boards provide for shortened signal and power pathways with lowest noise
- Fully balanced output stage and balanced circuitry
- 22 4-pole Mundorf® capacitors
- Custom-made Navcom® feet to absorb vibrations
- Furutech® rhodium-plated RCA and torque-guard speaker connectors
DESIGN
Delta MONO continues Classé’s reputation for monumental design. The amplifier creates an immediate presence in any room or installation through its unique form and superb materials. The illuminated VU meter beautifully communicates output with elegance and detail. This is an amplifier that looks as iconic as it sounds.
- Harmony between minimal design and unrivalled performance
- Luxurious anodized aluminum body
- Custom, illuminated VU meters
- Perfectly complements other components in the Delta family
VERSATILITY
Thanks to the unique ICTunnel™ cooling technology, Delta MONO is stackable and rackable in a way no conventionally-cooled amplifier can match. Internal temperature is continuously monitored and controlled, ensuring performance in any configuration. Combined with Delta MONO’s construction, ICTunnel supports a lifetime of unrivalled amplification performance.
- Proprietary ICTunnel™ temperature regulation technology
- Power-on to optimal temperature in minutes
- Active sensing and regulation of optimal amplifier temperature
- Low-noise operation suitable for studio applications
Verified Dealers
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Authorized dealers for Classé Audio Delta MONO
- Abt Electronics — online and in-store — Glenview, Illinois, United States (website)
- Acoustica — online and in-store — Chester, England, United Kingdom (website)
- Alta Fedelta — online and in-store — Lombardia, Italy (website)
- Area Hifi — online and in-store — L'Eixample, Comunidad Valenciana, Spain (website)
- Audio & Video Expressions — in-store — Philadelphia, Pennsylvania, United States (website)
- Audio Advice — online and in-store — Raleigh, North Carolina, United States (website)
- Audio Aktoren — online and in-store — Horten, Vestfold, Norway (website)
- Audio Center (website)
- Audio Classics — in-store — New York, United States (website)
- Audio Experience — online and in-store — Derby, Connecticut, United States (website)
and 62 more verified dealers