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  • KWA150 Front View
  • Rear of the KWA 150. Note the ground lift switch, balanced inputs and of course the mono switch
  • Internals of the KWA 150

Modwright KWA 150 Amplifier - $6995, Free Shipping

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Product Description

Modwright KWA 150

Find Out What Your Trade Is Worth | Questions? Call 303-653-6341 or email us.

modwright kwa 150

Built like a tank, weighing in at over 80 pounds, performance that bests most 250 watt amps, and gorgeous looks from the machined aluminum chassis, one would expect to pay a lot more for the Modwright KWA 150. The KWA 150 provides the strengths of both Tube and Solid State products: 3-D sound-staging, holographic imaging and beautiful midrange of tubes, combined with sparkling highs, low distortion, bass resolution and control of solid state. Free shipping applies to US destinations only.

12/09 The Absolute Sound's Dick Olsher says:

"To my ears, the KWA 150 represents a smashing success, combining the musicality of tubes with the punch, power delivery and bass reach of transistors. Factor in the performance and looks of this amp relative to its asking price and the result is a fantastic value."

04/09 Review - Terrific review, with great photos too!

Quality - "During the review period, two manufacturers or their representatives laid eyes on the KWA-150 while delivering their goods. And they invariably commented on the extravagant enclosure and its intricately carved out top. Unfamiliar with the brand, they also over-guessed the price by a factor of at least two. When I explained that this included being built in America and dealer distribution, the ensuing silence said all."

Sound - "Dynamics both micro and macro and ultra low-level fitness arguably score highest in what is a brilliant score card to begin with. I personally find macrodynamics to be less important since they apply mostly to symphonic music and anyone intent on recreating 'the real thing' on that score is hopelessly deluded. It's the microdynamics in the cramped 10dB of dynamic range that most music is recorded in today where the real differences occur between posthumous and alive, boring and compelling. Without being zippy, threadbare, nervous or hyped in the least, the ModWright KWA-150 despite its muscle beach allure is ideal for quiet yet fully satisfying sessions. Forget testosterone, that's what most music lovers do most of the time. They listen at from civilized to very subdued levels cognizant of neighbors and cohabitants, all the while longing for fulfillment from spirited sessions. That's where the KWA-150 delivers big time".- SixMoons


A revolutionary breakthrough in solid-state amp design!

The KWA 150 provides the strengths of both Tube and Solid State products:  3-D sound-staging, holographic imaging and beautiful midrange of tubes, combined with sparkling highs, low distortion, bass resolution and control of solid state.
The heart of the KWA 150 amplifier is a single voltage gain stage called the ‘Solid State Music Stage’.  The circuit was developed by Alan Kimmel, creator of the exceptional vacuum tube ‘Mu’ stage. Its also a zero global feedback design with transformer-coupled true balanced floating inputs and direct-coupling from there into fully differential, pure solid-state circuitry. ModWright Instruments capacitors are used as power supply bypasses in key locations and total power supply capacitance reserves are 216,000uF.

Output short circuit protection as well as overload circuit protection operate completely outsid the signal path. Transformer coupling blocks out-of-band noise as well as errant DC from preamp or source. Modwright uses the highest-grade Thermal Trak bipolar output devices with auto thermal bias with six pairs per channel, i.e. six transistors per phase. The amp has a hi/lo bias feature for standby or cool operation (low bias); and best sonics and greater heat dissipation (high bias). But even in high bias, it still won't run as hot as pure class A. The amp is bridgeable to mono with a third set of binding posts and a stereo/mono switch. Tests have proven that it delivers 650 watts into a 4-ohm load then.

Features include:  high-low bias switch, stereo/bridge-mono switch and true balanced floating inputs, accepting balanced and unbalanced inputs.  The design incorporates a regulated power supply for the input stage, Cardas’ best connectors, oversized heat-sinks and silent comprehensive protection circuitry operating completely outside of the signal path.  The first few watts operate in pure Class A.

Designed and built in the U.S.A.

AudioCircle thread on the KWA 150

StereoTimes RMAF 2008 commentary on the KWA 150

Design Specifications of the KWA 150:

  • Fully dual-mono internal design, including separate power transformers, power supplies and input and output stages for ideal separation and exceptional soundstage.
  • Chassis design and internal layout optimized for lowest possible noise floor, providing greater micro-detail and micro-dynamics for a natural and organics sonic presentation.
  • Fully discrete 'Solid State Music Stage' design by Alan Kimmel, offering midrange of tubes as well as muscle and speed of solid state design.
  • Zero global Negative feedback.
  • (24) High Current 'Thermatltrak' Bi-Polar output devices for extreme linearity and speed.
  • Over 180,000uf total power supply capacitance reserves for deep and tuneful bass.
  • Lundahl Input Transformer coupled floating ground design, preventing ground loops and isolation from ground mains, for exceptionally low noise floor.
  • RCA and XLR inputs transformer coupled to fully balanced circuitry.
  • Proprietary protection circuitry operating completely outside of signal path, protecting both amplifier and associated system components with ZERO impact on sonics.
  • DC input and output protection
  • Over-current protection.
  • Output short-circuit protection.
  • Thermal overload protection.
  • Proprietary 'RFB' circuit to protect amp in case of single rail fuse failure
  • Class A-AB operation.
  • Bias optimized for low distortion, heat and sonics, allowing for lower operating temperatures, and ideal sonic presentation.
  • Pure copper pcb traces, offering the lowest possible impedance.
  • Extremely short signal paths and highest quality MWI capacitors and audio grade signal path components for sonic purity.

Technical Specifications:

  • Dimensions: 17"Wx17"Dx9"H; Weight 84lb packed.
  • Power: 150W @ 8ohms; 250W @ 4 ohms; 450W @ 8 ohms bridged mono; 650W @ 4 ohms bridged mono. ALL power ratings at .05% THD!
  • Noise Floor: -100dB (Unweighted)
  • Bandwidth: 10Hz - 100Khz (+0, -1dB)
  • There are three 0.25"x20 threaded receptacles for spikes or other footers and the top cover matches the 36.5 preamp and external power supply.

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