ModWright Instruments KWA 150 Owner's Manual
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ModWright Instruments KWA 150 Owner's Manual

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KWA 150/150SE Power Amplifier
Owner's Manual
Manufactured by ModWright Instruments, Inc.
21919 399th St., Amboy, WA 98601
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Summary of Contents for ModWright Instruments KWA 150

  • Page 1 KWA 150/150SE Power Amplifier Owner’s Manual Manufactured by ModWright Instruments, Inc. 21919 399th St., Amboy, WA 98601...
  • Page 2 www.modwright.com...

  • Page 3: Please Read First

    PLEASE READ FIRST: General operation and protection circuitry of amplifier. • Startup: o To power unit up, simply depress the large MWI logo on the faceplate of the amp. When you do this, the unit will turn on and logo/button and internal blue lights will flash for approximately 45 seconds, while amp output is muted.
  • Page 4 unit will void the factory warranty. If unit protection triggers and amp will not re- start, please contact factory.

  • Page 5: General Operation

    • Mono operation: o The KWA 150 may also be operated as a mono amplifier, in bridged configuration. The Mono binding posts are internally wired for bridged operation. To operate in bridged mono mode, plug preamp into the Left input (MONO), speaker cables to Mono binding posts and toggle Mono switch to the up position.
  • Page 6 Caution: Do not connect the Mono binding post to any speaker circuitry that grounds any speaker lead. If either terminal of the Mono binding post are connected to GROUND when operating in bridge-mono mode, damage to the amp may occur. It is not recommended to run the amplifier in bridged mono into 2ohm loads.

  • Page 7: Ground Switch

    • High/Low Bias Operation: o High/low bias toggle is located on the rear of the amp, above the MONO binding posts. The bias status indicates how much current the amplifier output devices receive at idle. The best sonics are typically achieved in high-bias. This bias level also generates the highest amount of radiated heat and draws the most mains current.

  • Page 8: Specifications

    Specifications: Power Ratings: • 150W @ 8 ohms (Stereo) @ .06% THD. • 450W @ 8 ohms (Bridged Mono) @ .06% THD. • 200W @ 4 ohms (Stereo) @ .06% THD. • 650W @ 8 ohms (Bridged Mono) @ .06% THD. Technical Specification: •...
  • Page 9 KWA 150SE Upgrades: • Upgraded input stage circuitry, resulting in lower distortion and noise levels. • Higher Quality Lundahl input transformer with larger signal capacity. • All ultra-pure copper, solid-core, cryo-treated audio-grade input signal wiring. • Output wiring upgraded to 12GA Cardsas Litz wire. •...

  • Page 10: Warranty

    ModWright Instruments or authorized service center. There are no user-serviceable parts inside the amplifier and evidence that someone other than a ModWright Instruments Factory Authorized service professional has opened the product enclosure or in any way tampered with the internal workings of the unit, including replacement of stock fuses, will void factory warranty.
  • Page 11 President, Owner ModWright Instruments, Inc.

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