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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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Krell KAV-300I Integrated Amplifier
• Product Overview – The Krell KAV-300I Integrated Amplifier was released in 1999 as a solid-state Class A/AB design, combining preamplifier and high-current power amplification for authoritative control and classic Krell drive.
• Amplification Performance – Delivering exceptional grip and dynamics, the amplifier provides effortless current delivery, wide bandwidth, and low noise, making it ideal for demanding loudspeakers and high-resolution analogue or digital sources.
• Build & Sonic Character – The Krell KAV-300I Integrated Amplifier features Krell’s robust power supply architecture, discrete circuitry, and minimalist signal path, resulting in tight bass, transparent midrange, and extended, controlled high frequencies.
• Specifications – Rated at approximately 150 W per channel into 8 ohms and 300 W into 4 ohms, with high-current output stages, wide frequency response, and stable operation into low-impedance speaker loads.
• Dimensions – Measures approximately 432 mm (W) × 178 mm (H) × 457 mm (D), requiring a sturdy, well-ventilated rack to accommodate its substantial chassis depth and heat dissipation.
• Weight – Weighs roughly 31 kg, reflecting its oversized transformer, large capacitor bank, and heavy aluminum chassis designed for mechanical stability and long-term electrical performance.
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Krell KSA200S Amplifier
• Product Overview – The Krell KSA200S Amplifier, released in 1995, is a solid-state pure Class A stereo power amplifier delivering legendary current capability, extreme control, and the authoritative sonic signature Krell is known for.
• Amplification Topology – Designed with massive power supplies and fully balanced circuitry, the KSA200S operates in continuous Class A, providing unwavering drive, low distortion, and exceptional loudspeaker control even under demanding loads.
• Sonic Performance – Krell KSA200S Amplifier delivers explosive dynamics, deep controlled bass, and a neutral tonal balance, excelling with difficult speakers and large-scale orchestral or rock recordings at realistic listening levels.
• Specifications – Rated at 200 watts per channel into 8 ohms, doubling into 4 ohms, with stable operation into 2 ohms, ultra-high current output, and extremely low output impedance for maximum damping factor.
• Dimensions – Chassis measures approximately 438 mm (W) × 197 mm (H) × 546 mm (D), reflecting the substantial heatsinking and transformer size required for sustained Class A operation.
• Weight – Weighs approximately 72 kg, with the extreme mass attributed to oversized transformers, extensive heatsinks, and heavy internal construction designed for thermal stability and long-term reliability.
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Harmonix XDC-2 Power Cable (1.5m)
• Overview – Harmonix XDC-2 Power Cable, released in the early 2000s, is a Japanese audiophile-grade power cable designed to prioritise tonal naturalness, musical flow, and noise reduction over sheer current delivery.
• Design Philosophy – Developed using Harmonix’s tuning-by-ear approach, the cable focuses on resonance control, material synergy, and vibration damping to achieve a relaxed, organic presentation across analog and digital components.
• Sonic Performance – Harmonix XDC-2 Power Cable is renowned for smooth treble, rich midrange tonality, and coherent timing, making it especially attractive for tube systems and musically voiced solid-state equipment.
• Specifications – High-purity copper conductors, moderate gauge design, carefully selected dielectric materials, effective mechanical damping, and high-quality connectors optimized for stable contact and consistent AC power transfer.
• Dimensions – Commonly supplied in approximately 1.5 m length, featuring a flexible outer jacket that allows easy routing while maintaining consistent electrical and mechanical characteristics.
• Weight – Approximately 0.9 kg per cable, reflecting dense conductor materials and internal damping without excessive stiffness or stress on component IEC sockets.
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Krell FPB MC250 Monoblock
• Overview – Krell FPB MC250 Monoblock, released in 2001, is a solid-state Class A/AB monaural power amplifier designed to deliver immense current capability, extreme control, and reference-level dynamics for demanding loudspeakers.
• Amplifier Topology – Built on Krell’s Full Power Balanced architecture, it operates in high-bias Class A before transitioning to Class AB, ensuring low distortion, fast transient response, and consistent performance across complex loads.
• System Authority – The Krell FPB MC250 Monoblock excels at driving low-impedance and difficult speakers, producing authoritative bass grip, wide dynamic headroom, and effortless scale without compression at realistic listening levels.
• Specifications – Rated at 250 watts into 8 ohms, doubling to 500 watts into 4 ohms and higher into lower impedances, featuring extremely high damping factor, wide bandwidth, and fully balanced discrete circuitry.
• Dimensions – Approx. 438 mm (W) × 305 mm (H) × 533 mm (D), housed in a massive aluminium chassis with extensive heatsinking and internal isolation for thermal stability and vibration control.
• Weight – Approximately 68 kg per monoblock, reflecting enormous transformers, capacitor banks, and Krell’s uncompromising mechanical construction required for sustained high-current operation.
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Harmonix SYN 100 Spikes and RF909x Spike Base
• Product Overview – Harmonix SYN 100 Spikes and RF909x Spike Base, released in the mid-2000s, are vibration control accessories designed to optimize mechanical grounding, resonance dissipation, and tonal balance in high-end audio systems.
• Tuning Philosophy – Developed using Harmonix’s tuning-based approach, the combination controls energy flow rather than fully isolating components, preserving musicality, timing accuracy, and natural harmonic structure.
• System Enhancement – Harmonix SYN 100 Spikes and RF909x Spike Base improve focus, bass articulation, and soundstage stability when used under loudspeakers, racks, or electronics, especially in revealing high-resolution systems.
• Specifications – Precision-machined metal spikes with matched base interfaces, resonance-tuned materials, point-contact energy transfer, and compatibility with most speaker and rack threaded inserts for universal audiophile applications.
• Dimensions – Individual spike height is approximately 25 mm, with RF909x bases measuring roughly 50 mm in diameter, allowing discreet placement while maintaining effective mechanical coupling.
• Weight – Each spike and base set weighs approximately 150–200 g, providing sufficient mass for stability while supporting controlled resonance behavior and consistent component grounding.
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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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Krell KSL Pre Amp, FPB 200 Power Amp & KAV 300 CD Player
• Krell KSL Pre Amp, FPB 200 Power Amp & KAV 300 CD Player Overview – This early-2000s Krell trio delivers reference solid-state Class A/AB performance, combining authoritative power, ultra-low distortion, and exceptional transparency for serious high-end stereo systems.
• High-Resolution Preamplifier Clarity – The KSL preamp provides wide bandwidth, fully balanced circuitry, and a low-noise signal path, offering precise imaging, excellent channel separation, and a clean, neutral tonal balance suited for revealing systems.
• FPB 200 Class A/AB Power Authority – The Krell KSL Pre Amp, FPB 200 Power Amp & KAV 300 CD Player system is anchored by the FPB 200, delivering 200W per channel with Krell’s Sustained Plateau Bias for massive current and effortless control.
• Premium Digital Playback – The KAV 300 CD Player employs Krell’s advanced jitter-reduction, high-precision DAC architecture, and robust transport mechanism to produce detailed, dynamic, and musically engaging CD reproduction.
• Dimensions – KSL: approx. 432 × 76 × 381 mm. FPB 200: approx. 483 × 254 × 610 mm. KAV 300 CD: approx. 483 × 89 × 410 mm, all designed for rack-friendly installation.
• Weight – FPB 200 approx. 45–50 kg due to its massive transformers; KSL approx. 8 kg; KAV 300 CD approx. 10 kg, reflecting Krell’s heavy-duty, resonance-free construction.
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Adcom GFP-555 Preamp and GFA-5800 Power Amp
• Classic Adcom System – The Adcom GFP-555 Preamp and GFA-5800 Power Amp, introduced in the early 1990s, deliver robust solid-state performance with high-current Class AB amplification, offering strong dynamics and clean, authoritative control.
• High-Resolution Preamp Design – The GFP-555 features low-noise circuitry, precise tone controls, a high-quality phono stage, and multiple inputs, giving the Adcom GFP-555 Preamp and GFA-5800 Power Amp excellent system flexibility.
• Powerful Amplification – The GFA-5800, designed by Nelson Pass, provides 250W per channel into 8 ohms with massive current reserves. This ensures the Adcom GFP-555 Preamp and GFA-5800 Power Amp can drive difficult speakers with ease.
• Musical, Neutral Presentation – The pairing delivers fast transient response, wide soundstage, and neutral tonal balance, making it a sought-after vintage combo for both audiophiles and collectors seeking reliable performance.
• Dimensions – Preamp: approx. 432 × 89 × 330 mm. Power amp: approx. 432 × 203 × 483 mm. Designed to fit standard audio racks with deep shelves.
• Weight – Preamp weighs about 7 kg; power amp around 28–30 kg, thanks to its heavy transformer and large heat sinks for stable high-current operation.
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Adcom GFP-345 Pre-Amp and GFA-535 mk2 Amplifier
• Adcom GFP-345 Pre-Amp and GFA-535 Mk2 Amplifier – A classic solid-state pairing featuring a fully Class AB power stage, offering clean, authoritative drive and exceptional value for enthusiasts seeking transparent, reliable high-fidelity performance.
• Refined Preamp Control – The GFP-345 provides precise volume management, clean signal routing, high-quality phono stage support, and low-noise circuitry, enabling a neutral presentation with impressive musical clarity across varied source components.
• Dynamic Class AB Power – The GFA-535 Mk2 delivers approximately 60W per channel into 8 ohms with robust current delivery, maintaining excellent channel separation, punchy dynamics, and stable operation even with moderately difficult loudspeaker loads.
• Synergistic System Performance – Together, the GFP-345 and GFA-535 Mk2 create a cohesive soundstage with firm bass control, open midrange, and smooth treble, making this combo a proven choice for budget-conscious yet discerning listeners.
• Dimensions – GFP-345: approx. 432 mm (W) × 76 mm (H) × 330 mm (D). GFA-535 Mk2: approx. 432 mm (W) × 140 mm (H) × 330 mm (D). Fits standard racks comfortably.
• Weight – GFP-345 weighs around 5–6 kg, while GFA-535 Mk2 weighs roughly 10–11 kg, with a solid transformer and steel chassis enhancing durability and vibration resistance.
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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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Krell KSA-300S Stereo Amplifier
• Krell KSA-300S Stereo Amplifier – This powerhouse Class A/AB sliding-bias design delivers massive current, exceptional control, and the unmistakable Krell authority, driving even the most demanding speakers with effortless precision.
• Sustained Power Delivery – Known for its enormous current reserves and stability into extremely low impedances, the KSA-300S provides grip, dynamics, and low-frequency impact unmatched by typical solid-state amplifiers of its era.
• Sophisticated Krell Topology – Featuring Krell’s proprietary Sustained Plateau Biasing, the amplifier achieves Class A performance at practical efficiency levels, offering transparency, speed, and refined musical detail.
• System Integration – Balanced and single-ended inputs, robust binding posts, and a highly inert chassis ensure quiet operation, excellent grounding, and seamless matching with high-end preamps and loudspeakers.
• Dimensions – Krell KSA-300S Stereo Amplifier Measures approximately 483 mm (W) × 241 mm (H) × 686 mm (D), requiring a sturdy rack with ample ventilation due to its substantial heat dissipation needs.
• Weight – Weighs roughly 68–70 kg, attributed to its heavy transformer architecture and oversized power supply, ensuring rock-solid stability and peak performance under demanding loads.
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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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Adcom is an American audio electronics brand known for delivering high-current amplification and robust engineering at accessible price points. Rising to prominence through its power amplifiers and preamplifiers, Adcom focused on reliability, drive capability, and straightforward circuit design.
Adcom amplifiers are built with conservative engineering margins and substantial power supplies, allowing many models to remain in active use decades after release. This makes pre-owned Adcom equipment especially attractive to listeners seeking dependable amplification with lasting performance.
Across Singapore, Malaysia, and Southeast Asia, Adcom continues to appeal to value-conscious audiophiles building reliable systems. On SoundTribeAsia, Adcom equipment — new and pre-owned — is offered by verified dealers, providing transparent listings and trusted access through a regional marketplace.