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JBL 4635
• Overview – The JBL 4635 is a professional cinema subwoofer system engineered for high-output low-frequency reinforcement, utilizing dual 15-inch drivers in a large vented enclosure for powerful theatre-grade bass performance.
• Cinema Heritage – Designed for professional cinema installations, the JBL 4635 delivers deep, room-filling bass with exceptional dynamic capability, making it a legendary choice for large listening spaces and vintage high-efficiency systems.
• High-Output Performance – The JBL 4635 is capable of substantial acoustic output and extended low-frequency reproduction, providing impactful bass response that complements high-efficiency horn or large-format loudspeaker systems.
• Specifications – Dual 15-inch low-frequency drivers (typically JBL 2225H or 2226H depending on configuration), bass reflex enclosure, 4-ohm nominal impedance, frequency response approximately 30Hz–500Hz, high power handling exceeding 600W continuous.
• Dimensions – Approximately 1219 mm (H) × 762 mm (W) × 610 mm (D), reflecting its large cinema-grade enclosure designed for high acoustic efficiency and powerful low-frequency projection.
• Weight – Approximately 85–95 kg depending on driver configuration, constructed with heavy-duty cabinetry and professional drivers intended for demanding theatre and large venue applications.
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MBL N51 Integrated Amplifier
Specifications: MBL N51 Integrated Amplifier
• Type: Integrated amplifier
• Output Power: 380 W per channel (4 Ω), 200 W per channel (8 Ω)
• Class of Operation: Class A / AB hybrid
• Inputs: 3 × RCA (unbalanced), 2 × XLR (balanced)
• Outputs: 1 × RCA pre-out, 1 × XLR pre-out
• Frequency Response: 0.3 Hz – 330 kHz (-3 dB)
• THD: < 0.01% • Damping Factor: 200
• Input Impedance: 47 kΩ
• Dimensions (W × H × D): 45 × 17 × 40 cm
• Weight: 35 kg
• Made in Germany
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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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MBL N15 Monoblock
• Product Overview – MBL N15 Monoblock, released in 2019, is a solid-state Class AB monaural power amplifier delivering high-current authority, extreme stability, and effortless control for reference-grade loudspeaker systems.
• Amplification Architecture – Fully balanced signal topology with oversized power supplies ensures low noise, exceptional channel separation, and unwavering performance under demanding loads, reflecting MBL’s Noble Line engineering philosophy.
• Sonic Performance – MBL N15 Monoblock delivers immense dynamic headroom, deep bass grip, and expansive soundstage reproduction, maintaining tonal neutrality and composure even at high listening levels.
• Specifications – Rated at approximately 200 W into 8 ohms and 400 W into 4 ohms, with high-current output stages optimized for difficult speaker impedances and wide bandwidth signal handling.
• Dimensions – Each chassis measures approximately 480 mm (W) × 170 mm (H) × 480 mm (D), designed to integrate seamlessly into high-end audio racks while supporting robust internal power architecture.
• Weight – Each monoblock weighs approximately 33 kg, reflecting heavy-duty transformers, extensive heatsinking, and rigid construction essential for long-term thermal stability and sonic consistency.
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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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TEAC VRDS-25
• Teac VRDS-25 CD Transport Overview – The Teac VRDS-25, released in the mid-1990s, features the renowned VRDS clamping mechanism that reduces disc vibration and jitter for significantly improved digital accuracy and musical refinement.
• VRDS Precision Engineering – Its die-cast aluminium transport stabilises discs during playback, minimising errors and mechanical resonance, making the VRDS-25 a respected benchmark among vintage audiophile CD transports.
• Exceptional Digital Output Quality – Offering coaxial and optical digital outputs, the unit delivers a clean, stable signal ideal for pairing with modern DACs, allowing the Teac VRDS-25 to remain highly relevant today.
• Robust Audiophile Construction – With a thick chassis, reinforced transport base, and premium internal components, the VRDS-25 provides excellent isolation from vibration and reliable long-term performance.
• Dimensions – Approx. 442 mm (W) × 125 mm (H) × 351 mm (D), offering a substantial chassis with optimal internal layout for transport stability and resonance control.
• Weight – Around 13–14 kg, reflecting the heavy VRDS mechanism and solid build quality that contribute to the unit’s speed stability and low mechanical noise.
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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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JBL Synthesis Project Array 1400
• High-Performance Overview – The JBL Synthesis Project Array 1400, launched around 2007, is a flagship floorstanding loudspeaker using a Bi-Radial horn and powerful low-frequency system to deliver dynamic, room-filling cinema-grade sound.
• Horn-Loaded Precision – The JBL Synthesis Project Array 1400 features a titanium compression driver and advanced horn geometry, providing exceptional clarity, wide dispersion, and precise imaging ideal for both music and home-theater environments.
• Deep, Controlled Bass – A massive 14-inch Neodymium woofer delivers authoritative low frequencies with excellent transient response, enabling the Project Array 1400 to handle demanding low-end material while maintaining accuracy and control.
• Ultra-High Output Capability – With high sensitivity and robust driver construction, the JBL Synthesis Project Array 1400 achieves reference-level dynamics, low distortion, and impactful realism even at elevated listening levels.
• Dimensions – Approx. 1,115 mm (H) × 508 mm (W) × 406 mm (D). Large cabinet volume supports deep bass extension and wide sound dispersion across medium to large rooms.
• Weight – Approx. 64 kg per speaker, providing exceptional mechanical stability and reducing cabinet resonance for cleaner, more accurate acoustic performance.
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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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MBL C51 Integrated Amplifier
• MBL C51 Integrated Amplifier – This premium Class AB integrated amplifier combines high-current power delivery with MBL’s signature refinement, offering holographic imaging, smooth dynamics, and authoritative control suitable for demanding loudspeaker systems.
• Advanced Pre/Power Architecture – The C51 uses discrete circuitry, ultra-low-noise voltage regulation, and precision volume control to ensure exceptional signal purity, delivering lifelike tonal accuracy and outstanding microdynamic resolution.
• High-Current Output Performance – MBL C51 Integrated Amplifier is rated at 180W into 8Ω and 300W into 4Ω, the C51 provides excellent stability, grip, and transient impact, enabling it to drive complex speaker loads effortlessly and musically.
• Premium Noble Line Engineering – Borrowing from MBL’s flagship designs, the C51 features robust internal layout, resonance-optimized chassis construction, and meticulous parts selection to ensure consistent high-end performance.
• Dimensions – Approx. 440 mm (W) × 183 mm (H) × 390 mm (D). The sculpted Noble Line chassis provides superior mechanical stability and ventilation for reliable long-term operation.
• Weight – Approximately 28 kg, offering excellent mass damping and structural rigidity that enhances noise reduction and overall sonic refinement.
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MBL N11 Preamplifier and N21 Stereo Power Amplifier
• MBL N11 Preamplifier and N21 Stereo Power Amplifier – This flagship Noble Line pairing delivers exceptional refinement, with the N21 operating in Class AB to provide authoritative drive, holographic imaging, and MBL’s signature musical realism.
• Ultra-Low-Noise Preamplifier Design – The MBL N11 employs discrete gain stages, precision resistive ladder volume control, and advanced isolation topology, ensuring absolute signal purity, superior dynamic contrast, and effortless tonal accuracy.
• High-Current Power Capability – The MBL N21 outputs 250W into 8Ω and doubles into 4Ω, offering exceptional control, stability, and dynamic reach, allowing demanding loudspeakers to perform with scale and composure.
• Noble Line System Synergy – When paired, the N11 and N21 deliver seamless coherence, expansive sound staging, and deep microdynamic detail, embodying MBL’s renowned ability to recreate live, full-bodied, three-dimensional musical presence.
• Dimensions – N11: approx. 440 × 92 × 390 mm (W × H × D).
N21: approx. 440 × 210 × 460 mm. Both share the distinctive Noble Line geometry and robust internal architecture.
• Weight – N11 approx. 12 kg; N21 approx. 38 kg. Heavy, resonance-controlled chassis construction enhances mechanical stability, lowers noise, and maximizes overall sonic performance.
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JBL HP 520 Speakers
• High-Performance Design – The JBL HP 520 Speakers deliver dynamic, room-filling sound with impressive bass depth, refined midrange clarity, and excellent dispersion, making them ideal for audiophiles seeking a powerful yet balanced presentation.
• Acoustic Precision – Featuring advanced JBL driver engineering and a well-tuned cabinet, these speakers offer articulate imaging, smooth frequency response, and reliable performance across a wide range of musical genres and listening environments.
• Versatile System Matching – The JBL HP 520 Speakers pair effectively with solid-state or tube amplification, offering stable impedance behavior and strong efficiency, ensuring consistent performance across diverse hi-fi system setups.
• Robust Build Quality – Constructed with solid cabinetry and high-quality drivers, the JBL HP 520 Speakers provide durability, low resonance, and long-term performance ideal for serious home audio enthusiasts.
• Dimensions – Each speaker measures approximately 680 mm (H) × 380 mm (W) × 300 mm (D), offering a substantial footprint while remaining manageable for medium to large listening rooms.
• Weight – Each unit weighs around 18–20 kg, providing cabinet stability and reducing unwanted vibration for improved sonic accuracy.
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Teac NT-503 (Black)
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TEAC NT-503 (Black) – A dual-monaural USB DAC and network player with reference-level audio architecture built for discerning digital hi-fi systems.
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Precision digital architecture – Supports PCM up to 384 kHz/32-bit and native DSD up to 11.2 MHz with dual AKM VERITA AK4490 DACs.
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Network and source flexibility – Includes DLNA 1.5, Bluetooth aptX/AAC/SBC, front-USB Type-A, rear-USB Type-B, Ethernet, optical/coax inputs and full app control.
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Product dimensions – 290 mm (W) × 81 mm (H) × 249 mm (D) / ~11.4″ × 3.2″ × 9.8″, designed for compact high-end rigs.
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Weight – Approximately 3.9 kg (8.6 lbs) ensuring high mechanical stability and premium build quality.
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Advanced features – Fully balanced analog outputs (XLR/RCA), 10 MHz external clock input, up-conversion to 12.2 MHz DSD or 384 kHz PCM, plus built-in headphone amplifier (500 mW + 500 mW).
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MBL 116F Radialstrahler Loudspeaker
• Omnidirectional Loudspeaker Overview – The MBL 116F Radialstrahler Loudspeaker delivers full-range 360-degree radiation with exceptional coherence, holographic staging and organic musical flow, offering a truly immersive high-end listening experience for advanced systems.
• Radialstrahler Driver Architecture – Using MBL’s patented Radialstrahler transducers, the design produces uniform dispersion, natural tonal density and lifelike spatial imaging, with one mention of MBL 116F Radialstrahler Loudspeaker across the system description.
• Bass System & Dynamic Behaviour – Featuring dedicated woofers and a powerful low-frequency chamber, the speaker provides deep, controlled bass, outstanding transient speed and exceptional dynamic scaling, with one additional mention of MBL 116F Radialstrahler Loudspeaker.
• Cabinet Engineering & Vibration Control – The rigid, multi-chamber enclosure minimises resonances while supporting seamless driver integration, allowing improved clarity, stable imaging and highly accurate reproduction across complex acoustic environments.
• Product Dimensions – Each loudspeaker measures approximately 1,200 mm (H) × 310 mm (W) × 430 mm (D), offering a sculptural footprint designed for ideal dispersion and room placement flexibility.
• Product Weight – Weighing around 50–55 kg per speaker, the substantial cabinet structure enhances mechanical stability, reduces coloration and supports superior bass definition and overall acoustic performance.
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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.