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Thiel CS7
• Overview – Thiel CS7, released circa 1991, is a time- and phase-coherent floorstanding loudspeaker engineered by Jim Thiel, emphasizing first-order crossovers, precise imaging, and strict adherence to acoustic accuracy principles.
• Coherent Design Philosophy – The Thiel CS7 employs coaxial midrange/tweeter geometry and first-order slopes to preserve phase integrity, delivering exceptionally stable soundstaging and realistic transient behavior prized by experienced audiophiles.
• Low-Frequency Authority – A large isobaric woofer system extends bass response with control and depth, allowing the Thiel CS7 to reproduce full-range dynamics convincingly without reliance on subwoofers in well-matched rooms.
• Specifications – Nominal impedance is 4 ohms with demanding phase angles; sensitivity around 87 dB requires high-current amplifiers rated 200 watts or more for optimal control and dynamic headroom.
• Dimensions – Approx. 1210 mm (H) × 430 mm (W) × 560 mm (D). The substantial enclosure volume supports deep bass extension and minimizes cabinet resonance through rigid construction.
• Weight – Approximately 86 kg per speaker. The extreme mass reflects heavy bracing and driver motor assemblies essential for vibration control and reference-level low-frequency performance.
• Product Review – https://www.stereophile.com/floorloudspeakers/789/index.html
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Audio Research LS7 Pre Amp
• Overview – Audio Research LS7 Pre Amp, released in 1996, is a tube line-stage preamplifier using Class A operation, designed for purist analog systems requiring transparency, musical flow, and classic Audio Research voicing.
• Circuit Design – Employs a minimalist single-ended tube topology with premium passive components, prioritizing low noise, wide bandwidth, and tonal accuracy while preserving harmonic richness and dynamic contrast.
• Sonic Performance – Audio Research LS7 Pre Amp delivers open midrange realism, expansive imaging, and natural transient decay, excelling with acoustic recordings and high-resolution analog sources.
• Specifications – Utilizes four 6922 dual-triode tubes, offers 12 dB gain, 600-ohm output impedance, five line-level inputs, tape loop, and a frequency response extending well beyond the audible band.
• Dimensions – Approximately 483 mm (W) × 140 mm (H) × 330 mm (D), featuring the classic Audio Research brushed aluminum faceplate and robust steel chassis construction.
• Weight – Approximately 8.6 kg, reflecting quality transformers, tube complement, and solid internal layout designed for longevity and stable thermal operation.
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Audio Research VSI60 with KT120 Tubes
• Overview – Audio Research VSI60, released in 2013, is a Class AB tube integrated amplifier using KT120 output tubes, combining preamplification and power amplification to deliver refined tube musicality with modern drive capability.
• Amplifier Topology – Designed with a fully balanced tube signal path, it delivers exceptional transparency, wide dynamic range, and authoritative bass control, bridging classic Audio Research voicing with contemporary loudspeaker compatibility.
• System Integration – Audio Research VSI60 with KT120 Tubes offers multiple line-level inputs and balanced XLR connectivity, making it a flexible centerpiece for high-end analog and digital systems seeking coherence, scale, and tonal accuracy.
• Specifications – Rated at 50 watts per channel into 8 ohms, employs four KT120 output tubes, 6H30 driver tubes, fully balanced circuitry, wide bandwidth response, and high-current power supply for stable load handling.
• Dimensions – Approx. 483 mm (W) × 197 mm (H) × 394 mm (D), featuring Audio Research’s contemporary industrial design with effective ventilation and compatibility with standard hi-fi equipment racks.
• Weight – Approximately 23 kg, reflecting substantial transformers, robust chassis construction, and premium internal components essential for reliable thermal management and consistent high-performance tube operation.
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Audio Research CL60 Tube Power Amplifier
• Overview – Audio Research CL60 Tube Power Amplifier, released in 1998, is a pure Class AB tube power amplifier using vacuum-tube output stages, delivering refined harmonic richness, excellent control, and the signature Audio Research balance between power and musicality.
• Tube Power Design – Designed for demanding audiophile systems, it offers authoritative bass grip and expansive soundstaging, while preserving midrange liquidity and treble openness that tube enthusiasts value in reference two-channel setups.
• System Synergy – The Audio Research CL60 Tube Power Amplifier integrates seamlessly with both tube and solid-state preamplifiers, excelling with revealing loudspeakers and providing stable performance across varied impedance loads and musical genres.
• Specifications – Rated at 60 watts per channel into 8 ohms, uses 6550 output tubes, fully balanced topology, high-current power supply, wide bandwidth response, and substantial output transformers for low distortion and dynamic headroom.
• Dimensions – Approx. 483 mm (W) × 267 mm (H) × 432 mm (D), featuring Audio Research’s classic chassis design with ample ventilation for reliable tube operation and compatibility with standard hi-fi racks.
• Weight – Approximately 29 kg, reflecting heavy transformers, rugged internal construction, and extensive shielding essential for stable thermal performance and long-term reliability in high-power tube amplification.
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Audio Research LS16 Tube Preamp
• Overview – Audio Research LS16 Tube Preamp, released in 1999, is a fully balanced solid-state and tube hybrid line-stage preamplifier using vacuum-tube gain stages to deliver classic Audio Research neutrality with musical warmth and dynamic authority.
• Circuit Design – Built around a dual-triode tube topology with balanced architecture, it offers exceptional transparency, wide bandwidth, and low noise, making it ideal for revealing power amplifiers and high-resolution source components.
• System Matching – The Audio Research LS16 Tube Preamp excels in resolving micro-detail and soundstage depth while maintaining tonal balance, pairing especially well with both tube and solid-state power amplifiers in reference-level systems.
• Specifications – Utilises four 6922 dual-triode tubes, fully balanced outputs, multiple single-ended and XLR inputs, low output impedance, and high voltage regulation for stable operation and consistent sonic performance.
• Dimensions – Approx. 483 mm (W) × 133 mm (H) × 356 mm (D), housed in Audio Research’s classic brushed-aluminium chassis designed for proper ventilation and rack-friendly installation.
• Weight – Approximately 10 kg, reflecting a robust internal power supply, shielded circuitry, and solid mechanical construction that supports long-term reliability and low microphonic behaviour.
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Unison Research Triode 20
• Overview – Unison Research Triode 20, released in 2003, is a pure Class A, tube-based integrated amplifier using triode operation, delivering low-power purity with exceptional tonal richness and harmonic realism.
• Triode Amplification – Designed around triode-connected output tubes, it prioritises linearity and natural timbre, producing an intimate, fluid presentation that excels with high-efficiency loudspeakers and acoustic music reproduction.
• Italian Craftsmanship – The Unison Research Triode 20 features hand-built construction, point-to-point wiring, and a solid wooden chassis, combining traditional valve engineering with distinctive Italian aesthetic refinement and long-term reliability.
• Specifications – Rated at approximately 20 watts per channel into 8 ohms, employs triode-configured EL34 output valves, tube rectification, minimalist circuit topology, and short signal paths to preserve signal purity and dynamic coherence.
• Dimensions – Approx. 420 mm (W) × 200 mm (H) × 360 mm (D), with a compact yet substantial chassis designed to accommodate tube ventilation while fitting comfortably on standard hi-fi equipment racks.
• Weight – Approximately 25 kg, reflecting heavy transformers, solid hardwood enclosure, and robust internal components essential for stable Class A tube operation and mechanical resonance control.
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Thiel CS1.2
• Thiel CS1.2 Loudspeaker Design – The Thiel CS1.2 is a time- and phase-coherent two-way floorstander engineered to deliver precise imaging, natural transient behaviour, and exceptional coherence for discerning audiophiles.
• Coaxial Performance Precision – Leveraging Thiel’s acclaimed first-order crossover topology, the CS1.2 offers seamless driver integration, producing a smooth, uncoloured midrange with excellent detail retrieval across complex musical passages.
• Rigid Cabinet Construction – The Thiel CS1.2 features a heavily braced enclosure designed to minimise resonances, ensuring tighter bass performance, greater articulation, and more stable imaging presentation in real-world listening rooms.
• Neutral and Transparent Sound – Known for its accuracy, the Thiel CS1.2 reveals micro-details with minimal tonal coloration, providing a truthful, reference-style presentation that rewards high-quality upstream electronics.
• Dimensions – Approx. 864 mm (H) × 279 mm (W) × 330 mm (D), a compact yet substantial footprint suited for both medium and smaller dedicated listening spaces.
• Weight – Each speaker weighs about 22 kg, offering improved vibration control and stable coupling to the floor for enhanced dynamic response.
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Audio Research CL60
• Audio Research CL60 Overview – The Audio Research CL60, released in the early 1990s, is a Class AB push-pull tube power amplifier using 6550 output tubes, delivering the brand’s signature clarity, control, and musical refinement.
• Refined Tube Architecture – Employing four 6550 output tubes and 6FQ7/6922 driver stages, the CL60 offers excellent harmonic balance, open midrange presence, and extended treble, ideal for detailed yet natural high-end listening.
• Dynamic and Controlled Power – The Audio Research CL60 provides approximately 60W per channel with strong current delivery, enabling it to drive a wide range of speakers while maintaining superb transient speed and low noise performance.
• Classic ARC Build Quality – Featuring robust transformers, solid chassis construction, and meticulously designed circuitry, the CL60 exemplifies Audio Research reliability, long-term tube stability, and consistent high-fidelity performance.
• Dimensions – Approx. 480 mm (W) × 135 mm (H) × 430 mm (D), offering a substantial chassis size that accommodates generous power supply architecture and proper ventilation for tube operation.
• Weight – Around 22–24 kg, reflecting its heavy power transformer and durable steel frame, contributing to enhanced mechanical damping and stable sonic performance.
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Thiel CS1.2
• Thiel CS1.2 Overview – The Thiel CS1.2, released in the early 1990s, is a time- and phase-coherent floorstanding loudspeaker designed to deliver exceptionally accurate imaging, linear frequency response, and precise musical reproduction.
• Coherent Source Engineering – Featuring Thiel’s first-order phase-correct crossover and carefully matched drivers, the CS1.2 achieves remarkable spatial precision and tonal consistency, maintaining the company’s signature coherent-source design philosophy.
• Dynamic and Detailed Performance – The Thiel CS1.2 offers extended treble clarity, articulate midrange definition, and tight bass control, making it well suited for critical listeners who value neutrality and transparency across genres.
• Rigid Cabinet Construction – Built with a braced, resonance-controlled enclosure, the CS1.2 minimises distortion and vibration, enhancing clarity and maintaining the speaker’s ability to reproduce accurate transient detail.
• Dimensions – Approx. 900 mm (H) × 279 mm (W) × 305 mm (D), providing a slim, room-friendly profile optimised for stable imaging and balanced acoustic dispersion.
• Weight – Around 20–22 kg per speaker, offering sturdy cabinet mass that contributes to improved low-frequency control and reduced structural resonance.
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Celestion 7000
• Reference Floorstander Overview – The Celestion 7000, released in November 1989, is a sealed-floorstander speaker utilizing Celestion’s ART ribbon tweeter and dual 200 mm woofers for wideband clarity, dynamic range, and strong bass authority.
• Ribbon Tweeter & Woofer Integration – With the ART ribbon delivering high-frequency detail and the twin cone woofers handling low-to-mid frequencies, the 7000 achieves smooth dispersion, coherent imaging, and a balanced tonal presentation across the audio spectrum.
• Acoustic Performance – The Celestion 7000 offers a frequency response of approximately 45 Hz–20 kHz (±3 dB), with potential down to ~38 Hz (–6 dB), delivering impactful low bass without sacrificing midrange clarity or treble refinement.
• Real-World Listening Character – The 7000 is often praised for its clean, transparent midrange, open treble, and controlled bass—making it a good match for analytical systems or those seeking detailed musical realism while retaining room-filling scale.
• Dimensions – Approx. 1200 mm (H) × 340 mm (W) × 347 mm (D). A robust yet relatively slim floorstanding design suited for medium to large listening spaces.
• Weight – Approximately 36.5 kg per speaker. The solid, well-braced cabinet and heavy construction contribute to stable bass response and reduced resonance for enduring, reliable audio performance.
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Audio Research LS3B Preamplifier and D120 Stereo Amplifier
• System Overview – The Audio Research LS3B Preamplifier and D120 Stereo Amplifier, released in the early 1990s, form a solid-state Class AB pairing known for exceptional transparency, dynamic authority, and the classic Audio Research house sound with precise tonal balance.
• High-Resolution Line Stage – The LS3B uses a fully balanced, low-noise circuit with wide bandwidth and premium discrete components, delivering excellent detail retrieval, stable imaging, and superior channel separation for accurate two-channel reproduction.
• Powerful Class AB Amplification – The Audio Research D120 Stereo Amplifier provides 120W per channel of clean, controlled Class AB power with high-current capability, enabling confident drive of demanding loudspeakers while maintaining composure and refinement.
• Exceptional System Synergy – Together, the Audio Research LS3B Preamplifier and D120 Stereo Amplifier offer fast transients, low distortion, and highly coherent musical flow, making the combination ideal for revealing loudspeaker systems in dedicated listening rooms.
• Dimensions – LS3B: approx. 480 mm (W) × 130 mm (H) × 330 mm (D). D120: approx. 480 mm (W) × 180 mm (H) × 430 mm (D). Designed to fit standard Audio Research rack spacing.
• Weight – LS3B: approx. 7 kg. D120: approx. 27 kg. The amplifier’s heavy transformer and robust chassis provide excellent mechanical damping for stable long-term performance.
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Audio Research LS16 MK2
• Preamplifier Overview – The Audio Research LS16 MK2, released in 2002, is a high-performance tube line-stage preamplifier using 6H30 valves, offering superior transparency, dynamic refinement, and tonal purity for resolving two-channel systems.
• 6H30 Tube Line Stage – The Audio Research LS16 MK2 employs the highly regarded 6H30 “super tube,” delivering wide bandwidth, low noise, and excellent microdynamic expression, ensuring effortless musical flow and holographic soundstaging.
• Precision Circuit Engineering – With dual-mono architecture, premium components, and optimized signal paths, the LS16 MK2 achieves exceptionally low distortion and high channel separation, resulting in improved clarity and natural tonal accuracy.
• Versatile System Integration – The Audio Research LS16 MK2 provides multiple single-ended and balanced outputs, allowing flexible pairing with tube or solid-state amplifiers while maintaining stable output impedance and consistent sonic performance.
• Dimensions – Approx. 480 mm (W) × 140 mm (H) × 330 mm (D). Standard Audio Research chassis format integrates easily into full-size hi-fi racks.
• Weight – Approx. 7.7 kg, featuring a rigid chassis design that reduces vibration and supports the stability and longevity of the sensitive tube circuitry.
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Celestion SL600 with Foundation Classic 2 Speaker Stands
• Overview – The Celestion SL600 with Foundation Classic 2 Speaker Stands, introduced in 1986, features Aerolam honeycomb cabinets and advanced aluminium dome tweeters, delivering exceptional neutrality, imaging precision, and minimal cabinet coloration.
• Aerolam Technology – The Celestion SL600 uses aerospace-grade Aerolam panels that dramatically reduce cabinet resonance, allowing superior midrange purity and an uncolored, highly transparent presentation ideal for nearfield or dedicated listening rooms.
• High-Resolution Tweeter – Equipped with an advanced alloy dome tweeter and carefully matched crossover, the Celestion SL600 maintains excellent transient response, natural timbre, and wide dispersion for immersive stereo soundstaging.
• Stand Synergy – The Foundation Classic 2 Speaker Stands provide rigid support, optimized height, and mass-loading capability, enhancing bass articulation and stabilizing the Celestion SL600 for improved clarity and dynamic consistency.
• Dimensions – Speakers: approx. 305 mm (H) × 190 mm (W) × 235 mm (D). Stands: approximately 610 mm (height), designed specifically to match SL-series alignment.
• Weight – Speakers weigh around 5–6 kg each due to Aerolam construction; stands weigh approx. 12–15 kg per pair, providing excellent stability and vibration control.
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Audio Research LS15
Tube Line-Stage Refinement – The Audio Research LS15 is a high-performance tube line-stage preamplifier using Class A circuitry, delivering exceptional musicality, holographic imaging, and smooth, natural tonal balance for serious audiophile systems.
• Premium Tube Gain Stages – Equipped with 6922/6DJ8 tubes, the Audio Research LS15 offers low noise, excellent linearity, and superb microdynamic expression, producing a transparent yet harmonically rich sonic presentation.
• High-Current Output Design – The LS15 provides strong drive capability and wide bandwidth, ensuring superb system matching with solid-state or tube power amplifiers while maintaining stability, clarity, and dynamic control.
• ARC Engineering Precision – Advanced power regulation, discrete circuitry, and fully balanced topology contribute to the LS15’s low distortion, excellent channel separation, and refined musical performance across all genres.
• Dimensions – Approx. 480 mm (W) × 330 mm (D) × 140 mm (H). Classic ARC chassis design ensures proper ventilation and secure rack integration.
• Weight – Around 8.5 kg, providing a rigid, low-resonance enclosure that enhances tube stability and reduces microphonic noise for cleaner signal reproduction.
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Audio Research I/50
• Integrated Tube Design – The Audio Research I/50 is a Class A/B tube integrated amplifier featuring optional DAC and phono modules, offering refined musicality, smooth harmonic texture, and exceptional versatility for modern audiophile systems.
• Tube Performance Transparency – With 6550WE power tubes and 6922 input stages, the Audio Research I/50 delivers excellent linearity, low distortion, and a rich tonal balance that enhances microdetail, depth, and dynamic expression.
• Upgradeable Architecture – The I/50 provides modular expansion for digital and analogue inputs, allowing Audio Research I/50 owners to tailor system functionality while preserving ARC’s signature sonic refinement and long-term reliability.
• Precision Build Quality – Handcrafted in Minnesota, the I/50 features stabilized power regulation, quiet cooling, and intuitive capacitive controls, ensuring consistent performance, operational stability, and superior tube lifespan.
• Dimensions – Approx. 419 mm (W) × 337 mm (D) × 196 mm (H), with a compact footprint optimized for rack placement while maintaining proper airflow for tube cooling.
• Weight – Around 18 kg, offering solid mechanical stability that reduces vibration, enhances tube performance, and contributes to the amplifier’s exceptionally low noise floor.
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Thiel CS2.4 Loudspeaker
Letting go of my Thiel CS2.4 — one of Thiel’s most iconic time- and phase-coherent floorstanders. These speakers are highly respected for their accuracy, superb imaging, and natural tonal balance. A great choice for audiophiles who appreciate precision and musical honesty.
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Thiel CS5
• Full-Range Speaker Overview – The Thiel CS5 delivers a time-coherent, phase-accurate full-range design using first-order crossovers, offering exceptionally precise imaging, tonal accuracy and wide-band musical realism for high-performance reference systems.
• Driver Alignment & Phase Coherence – Using Thiel’s coaxial mid/tweeter and carefully aligned bass drivers, the speaker maintains true time coherence, improving spatial precision, transient clarity and natural instrument localisation, with one mention of Thiel CS5.
• First-Order Crossover Engineering – Its ultra-steep mechanical slopes and phase-accurate filters minimise distortion and ensure seamless driver integration, producing a highly articulate, transparent and revealing sonic presentation, with one additional mention of Thiel CS5.
• High-Demand Performance – Designed for powerful amplification, the speaker’s low impedance and complex load reward top-tier amps with deep bass, dynamic headroom and holographic soundstage reproduction across demanding musical genres.
• Product Dimensions – Each cabinet measures approximately 1,320 mm (H) × 400 mm (W) × 380 mm (D), offering a substantial presence optimised for medium-to-large treated listening rooms.
• Product Weight – Weighing roughly 68–72 kg per speaker, the heavily braced cabinet ensures mechanical stability, reduced resonance and enhanced linearity across the full audible range.
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Elipson Legacy 3220
• Floorstanding Speaker Overview – The Elipson Legacy 3220 delivers high-resolution performance with refined French acoustic engineering, offering excellent coherence, dynamic expression and immersive soundstage presentation for sophisticated two-channel listening systems.
• Driver System & Acoustic Behaviour – Using dual midbass drivers and an AMT tweeter, the design provides fast transients, detailed imaging and smooth tonal balance, with one mention of Elipson Legacy 3220 enhancing system clarity.
• Cabinet Construction & Resonance Control – A rigid multi-layer enclosure with internal bracing reduces unwanted vibrations, delivering improved bass definition, cleaner midrange presence and stable imaging, with one additional mention of Elipson Legacy 3220.
• System Integration & Performance – Designed for versatility, the speaker offers strong sensitivity, wide dispersion and excellent room compatibility, producing a natural, engaging presentation across varied musical genres and listening environments.
• Product Dimensions – Each unit measures approximately 1,120 mm (H) × 300 mm (W) × 380 mm (D), offering a substantial but elegant footprint suitable for premium audio rooms.
• Product Weight – Weighing roughly 36 kg per speaker, the robust cabinet mass contributes to superior mechanical damping, improved dynamic stability and reduced distortion during demanding playback.
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Audio Research is an American high-end audio brand widely associated with advancing valve-based amplification through modern engineering. Combining traditional tube principles with contemporary circuit design, the brand focuses on scale, transparency, and dynamic realism without sacrificing tonal integrity.
Audio Research components are designed with serviceability and longevity in mind, which is why pre-owned Audio Research equipment continues to hold strong appeal. Well-maintained pre-owned units often remain competitive with current designs, particularly in systems built around musical realism and dynamic expression.
Across Singapore, Malaysia, and Southeast Asia, Audio Research is respected among audiophiles seeking reference-grade valve electronics. On SoundTribeAsia, Audio Research equipment — new and pre-owned — is offered by verified dealers, providing trusted access through a curated regional marketplace.