Power Amplifiers

The Aavik M-880 is a mono power amplifier made by Aavik, designed and assembled by Audio Group Denmark in Aalborg, Denmark. It uses a re-engineered Pure Class A output stage with eight output-transistor pairs, delivering 400 W into 8 Ω, 800 W into 4 Ω, and approximately 1,300 W into 2 Ω; distortion is specified as below 0.007% at 10 W, 1 kHz, and 8 Ω. Its technical design includes four 500 W, 20 A power-factor-corrected resonant-mode switching power supplies, a 266 mF local power bank, copper internal shielding, Ansuz noise-rejection technologies, and a wood-based laminate and stainless-steel cabinet base.

The Aavik P-188 is a stereo power amplifier made by Aavik, using the latest version of Pascal class D amplifier technology with UMAC switching modulation, lower output impedance, and reduced filtering requirements. Its power supply operates in power-factor-corrected resonant mode, and its circuitry includes active Tesla coils, active square Tesla coils, third-generation analog dither circuitry, and anti-aerial-resonance coils. It delivers 2 × 300 W into 8 ohms or 2 × 600 W into 4 ohms, with 0.0028% THD+N at 1 W, 1 kHz, and 8 ohms; dimensions are 440 × 430 × 117.8 mm and weight is 20.85 kg.

The Aavik P-280 is a stereo power amplifier made by Aavik, with outputs of 2 × 300 W into 8 ohms and 2 × 600 W into 4 ohms. It uses Aavik’s UMAC™ switching-amplifier topology with sine-wave PWM modulation, dual mixed-mode feedback, and a resonant-mode sine-wave power supply. The amplifier includes 72 active Tesla coils, 168 active square Tesla coils, 10 dither-circuitry units, and 4 anti-aerial-resonance coils, housed in a natural-based composite cabinet with reduced aluminium use.

The Aavik P-288 is a stereo power amplifier made by Aavik, rated at 2 × 300 W into 8 ohms and 2 × 600 W into 4 ohms. It uses the latest Pascal class D amplifier technology with UMAC switching modulation, a power-factor-corrected resonant-mode switching power supply, and 11 kΩ input impedance. Its noise-reduction circuitry includes 72 active Tesla coils, 187 active square Tesla coils, 7 dither-circuitry units, and 5 anti-aerial-resonance coils; dimensions are 440 × 430 × 117.8 mm and weight is 20.85 kg.

The Aavik P-580, made by Aavik, is a power amplifier rated at 2 × 300 watts into 8 ohms, with 0.006% distortion and 108 active Tesla coils. It uses Aavik’s UMAC™ switching-amplifier topology with sine-wave PWM generation and dual mixed-mode feedback, alongside a resonant-mode power supply with ultra-low-noise regulators. The amplifier has a natural-based composite cabinet, a solid-copper inner chassis, switchless LDR-based gain selection, active square Tesla coils, dither circuitry, and anti-aerial-resonance coil technology.

The Aavik P-588 is a power amplifier from Aavik, based on the latest Pascal class D amplifier technology with faster UMAC switching modulation, lower output impedance, and reduced filtering requirements. It uses a power-factor-corrected resonant-mode switching power supply and incorporates active Tesla coils, third-generation analog dither circuitry, and anti-aerial-resonance coil technology for noise reduction. The amplifier provides 2 × 300 W into 8 ohms or 2 × 600 W into 4 ohms, with 0.0028% THD+N at 1 W/1 kHz/8 ohms, 50-ohm output impedance, and dimensions of 440 × 430 × 116 mm.

The Aavik P-880 is a power amplifier made by Aavik, using a non-switching pure Class A topology with a specified output of 2 × 250 W into 8 ohms and 2 × 500 W into 4 ohms, and THD below 0.007% at 10 W, 1 kHz, and 8 ohms. It uses four 500 W power-factor-corrected resonant-mode power supplies, eight pairs of output transistors with local capacitor banks, and a solid copper enclosure with a copper, compact-laminate, and titanium bottom-plate sandwich construction. Its noise-reduction system includes 182 active Tesla coils, 411 active square Tesla coils, 18 dither-circuitry sections, 20 active zirconium anti-aerial-resonance Tesla coils, and 4 active zirconium cable anti-aerial-resonance Tesla coils.

Hybrid tube/solid-state integrated amplifier with dual mono design. Two 12AU7 tubes in preamp stage, solid-state output stage. Multiple award winner.

The ACCUSTIC ARTS AMP II–MK4 is a dual-mono reference power amplifier manufactured by ACCUSTIC ARTS, with completely isolated power supplies for its two channels and Class A operation in most applications. It uses 20 selected MOS-FET output transistors, two magnetically shielded and encapsulated toroidal-core transformers, approximately 160,000 µF of power-supply capacity, and switchable balanced XLR and unbalanced RCA inputs. Rated output is 2 × 750 W at 2 Ω, 2 × 530 W at 4 Ω, and 2 × 310 W at 8 Ω; the housing is made entirely of aluminium with a polished, chromed solid-brass inlay, and the unit is handmade in Germany.

The ACCUSTIC ARTS MONO II–MK2 is a single-channel mono power amplifier made by ACCUSTIC ARTS and handmade in Germany. It uses a current-mirror driver stage, 10 MOS-FET output transistors, a magnetically shielded and encapsulated toroidal transformer, more than 80,000 µF of power-supply capacity, and switchable damping-factor linearization. It delivers up to 750 W at 2 Ω, 530 W at 4 Ω, and 310 W at 8 Ω, with balanced XLR and unbalanced RCA inputs, and is housed in a resonance-optimized aluminum chassis with a polished chromed-brass inlay.

The ACCUSTIC ARTS MONO VI is a mono power amplifier made by ACCUSTIC ARTS and handmade in Germany. It uses 20 MOS-FET output transistors, magnetically shielded and encapsulated toroidal-core transformers, more than 110,000 µF of power-supply capacity, and a massive aluminium housing with a polished, chromed brass inlay. It provides switchable balanced XLR and unbalanced RCA inputs, switchable damping-factor linearization, and rated output of more than 1,600 W at 2 Ω, 1,500 W at 4 Ω, and 950 W at 8 Ω; it weighs approximately 74 kg.

The ACCUSTIC ARTS MONO VI is a mono power amplifier made by ACCUSTIC ARTS and handmade in Germany. It uses 20 MOS-FET output transistors, magnetically shielded and encapsulated toroidal-core transformers, more than 110,000 µF of power-supply capacity, and a massive aluminium housing with a polished, chromed brass inlay. It provides switchable balanced XLR and unbalanced RCA inputs, switchable damping-factor linearization, and rated output of more than 1,600 W at 2 Ω, 1,500 W at 4 Ω, and 950 W at 8 Ω; it weighs approximately 74 kg.

The ACCUSTIC ARTS® POWER I is an integrated stereo power amplifier manufactured by ACCUSTIC ARTS® in Germany since 2002. Its topology includes 12 selected bipolar output transistors, an encapsulated 500 VA toroidal transformer with separate preamplifier and power-amplifier windings, more than 80,000 µF of power-supply capacity, and a rated output of 2 × 260 W at 4 Ω or 2 × 170 W at 8 Ω. It has two balanced XLR inputs, three unbalanced RCA inputs, a configurable RCA pre-output, a switchable headphone amplifier, a full-metal housing with a brushed-aluminum front panel, and chromed-brass controls.

The ACCUSTIC ARTS® POWER II is an audiophile integrated stereo power amplifier with an integrated switchable headphones amplifier, made by ACCUSTIC ARTS® and handmade in Germany. Its topology includes 12 selected Bipolar output transistors, an encapsulated 550 VA toroidal transformer with separate windings for the preamplifier and power-amplifier sections, and more than 80,000 µF of power-supply capacity. It provides 2 × 315 W at 2 Ω, 2 × 235 W at 4 Ω, and 2 × 180 W at 8 Ω, with two balanced XLR inputs, three unbalanced RCA inputs, a configurable RCA input/output, a 6.3 mm headphone output, a brushed-aluminum front panel, chromed-brass controls, and a full-metal housing.

The ACCUSTIC ARTS MONO II–MK2 is a single-channel mono power amplifier made by ACCUSTIC ARTS and handmade in Germany. It uses a current-mirror driver stage, 10 MOS-FET output transistors, a magnetically shielded and encapsulated toroidal transformer, more than 80,000 µF of power-supply capacity, and switchable damping-factor linearization. It delivers up to 750 W at 2 Ω, 530 W at 4 Ω, and 310 W at 8 Ω, with balanced XLR and unbalanced RCA inputs, and is housed in a resonance-optimized aluminum chassis with a polished chromed-brass inlay.

Hand-wired EL34 push-pull stereo power amplifier from A&M Ltd with custom Hashimoto output transformers and point-to-point wiring; a refinement of the original 1986 ATM-1.

Reference single-ended 300B stereo amplifier from Osaka, hand-wired point-to-point and delivering 9Wpc. $16,995 with Electro-Harmonix 300Bs; $19,995 with Takatsuki 300Bs.

Allnic Audio is a small South Korean workshop founded and helmed by veteran designer Kang Su Park, building transformer- and tube-based electronics in low volumes for a narrow global dealer network; the A-6000 is a double-parallel single-ended 300B monoblock that was Allnic's flagship power amp before being superseded by the A-10000.

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Atma-Sphere Music Systems is a small, hand-assembly manufacturer based in Saint Paul, Minnesota, best known for pioneering output-transformerless (OTL) tube amplifier designs sold in small numbers directly and through a limited specialty-dealer network; the M-60 Mk.3.3 is the smallest monoblock in Atma-Sphere's OTL range, sharing the topology of its larger, more expensive siblings.

Flagship 211 parallel single-ended monaural power amplifier. Pure triode design with no feedback. Legendary SET sonics with robust power delivery.

The Reference 160S is Audio Research's stereo-chassis take on its acclaimed Reference 160M monoblocks, packing the same eight KT150 output tubes, floating "GhostMeter" displays, and switchable Triode/Ultralinear operation into a single, more affordable box. It offers nearly the same sound quality as the monoblock pair at roughly two-thirds the price (Stereophile).