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Jeff Rowland 112 Power Amplifier
• Overview – The Jeff Rowland 112 Power Amplifier, released in 2004, is a solid state Class AB stereo power amplifier delivering refined power, exceptional control, and the brand’s signature ultra-low noise performance.
• Balanced Circuit Design – Featuring fully balanced circuitry and precision-matched components, the Jeff Rowland 112 Power Amplifier delivers remarkable transparency, expansive soundstaging, and effortless dynamic scaling across demanding loudspeaker loads.
• Precision Power Delivery – With a high-current output stage and robust linear power supply, this amplifier produces authoritative bass control, smooth midrange texture, and refined high-frequency extension without harshness or strain.
• Specifications – Rated at 150 watts per channel into 8 ohms and 300 watts into 4 ohms, balanced XLR and RCA inputs, high-current output stage, frequency response 10Hz–40kHz, signal-to-noise ratio exceeding 90dB.
• Dimensions – Approximately 432 mm wide × 95 mm high × 356 mm deep, housed in a precision-machined aluminum chassis designed for thermal stability and mechanical resonance control.
• Weight – Weighs approximately 15 kg, reflecting its substantial power supply, heavy-duty transformer, and solid billet aluminum construction typical of Jeff Rowland designs.
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Edge G3 Integrated Amplifier
• Overview – The Edge G3 Integrated Amplifier, released in the early 2000s, is a solid state Class AB integrated amplifier featuring high-current output stages and refined preamplification for authoritative, full-range loudspeaker control.
• Power & Drive – Delivering substantial current capability, Edge G3 Integrated Amplifier provides confident bass authority and stable performance into demanding loads, maintaining composure and dynamic headroom during complex musical passages.
• Build & Circuitry – Built with robust chassis construction and dual-mono inspired layout, the design emphasizes short signal paths and substantial power supply reserves to preserve transparency and channel separation.
• Specifications – Solid state Class AB topology, approximately 100–150 watts per channel into 8 ohms, high-current output stage, multiple line-level inputs, frequency response extending beyond 20 Hz–20 kHz with low distortion.
• Dimensions – Approximate dimensions are 430 mm wide × 150 mm high × 400 mm deep, providing substantial internal transformer space while fitting standard hi-fi racks.
• Weight – Weighing approximately 18–22 kg, the amplifier’s mass reflects its large power transformer and heat-sinking required for sustained high-current operation.
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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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Jeff Rowland Consonance Preamplifier
• Preamplifier Overview – The Jeff Rowland Consonance Preamplifier, introduced in the mid-1990s, is a reference solid-state line stage known for its ultra-low noise floor, holographic imaging, and refined tonal balance characteristic of Rowland’s early masterpieces.
• High-Resolution Line Stage – The Consonance employs fully balanced circuitry, premium discrete components, and short signal paths, ensuring exceptional transparency, natural harmonic structure, and impressive dynamic contrast with both solid-state and tube power amplifiers.
• Silent Power Architecture – Featuring Rowland’s renowned attention to power-supply regulation and isolation, the Jeff Rowland Consonance Preamplifier delivers extremely low distortion and stable channel performance, enhancing microdetail retrieval and spatial coherence.
• Precision Build Quality – Machined aluminum chassis, high-grade connectors, and vibration-resistant internal layout reinforce long-term stability, while providing the polished aesthetic and engineering elegance expected from Jeff Rowland designs.
• Dimensions – Approx. 430 mm (W) × 90 mm (H) × 300 mm (D). Designed for compatibility with standard rack systems while maintaining optimal internal airflow and cable management.
• Weight – Approx. 8–10 kg, depending on production revision, offering solid mechanical grounding that minimizes vibration and preserves low-noise signal integrity.
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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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Goldnote DS10 and PSU10
• Goldnote DS10 and PSU10 – The Goldnote DS10 and PSU10 deliver a high-end DAC/streamer with a dedicated external linear power supply, offering enhanced dynamics, lower noise and superior musical refinement for advanced audiophile systems.
• DAC Architecture & Streaming Platform – The Goldnote DS10 uses a premium AKM converter, advanced clocking and Roon-Ready streaming, providing smooth tonality, precise detail retrieval and stable high-resolution playback across modern digital sources.
• External Power Upgrade Performance – The PSU10 employs a multi-rail linear supply with ultra-low-noise voltage regulation, significantly improving the DS10’s transient behaviour, micro-detail resolution and overall soundstage stability.
• Connectivity & System Flexibility – With USB, coaxial, optical, Ethernet, Bluetooth 5.0 and analogue output options, the Goldnote DS10 and PSU10 integrate seamlessly into hybrid digital systems requiring broad format support and low-jitter signal management.
• Product Dimensions – The Goldnote DS10 measures approx. 200 mm (W) × 80 mm (H) × 260 mm (D), while the PSU10 shares a matching footprint for uniform stacking and optimal power isolation.
• Product Weight – DS10 weighs around 3.5 kg and the PSU10 approx. 4 kg, with both units benefiting from rigid chassis construction that improves mechanical grounding and reduces noise.
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Jeff Rowland Concentra Integrated Amplifier
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Jeff Rowland Concentra Integrated Amplifier – A masterpiece of Class AB amplification, combining preamplifier finesse and power amplifier control in one chassis for pure, transparent, and emotionally engaging sound reproduction.
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Refined Class AB Topology – Delivers 100W per channel into 8Ω (170W into 4Ω), offering effortless dynamics, exceptional headroom, and authoritative grip across complex musical passages.
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Precision Analog Engineering – Features fully balanced circuitry, ultra-low-noise design, and gold-plated connectors, ensuring perfect signal integrity and channel separation for uncompromised performance.
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Timeless Design and Build – Machined from solid aircraft-grade aluminum, the Jeff Rowland Concentra Integrated Amplifier combines elegance, reliability, and the hallmark sonic purity of Rowland engineering.
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Product Dimensions – 430 mm (W) × 100 mm (H) × 400 mm (D); compact yet substantial for a high-current integrated amplifier.
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Weight – Approximately 22 kg; heavy-duty chassis ensures exceptional stability, heat dissipation, and resonance control.
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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.