US Audio

whirlwind

99Ling Road. Rochester NY 14612 (585) 663-8820

Fax: (585) 865-8930

techsupport@whirlwindusa.com

P-12 STEREO POWER AMPLIFIER AND HEADPHONE DRIVER OWNERS

MANUAL

Congratulations on the purchase of the US Audio P-12 power amplifier. The P-12 is a stereo 12 Watt amplifier capable of producing moderate listening levels through speakers and headphones.

Front Panel

1.Channel and 2 volume controls

These knobs vary the amplifier output level.

2.Channel and 2 Clip LEDs

These LEDs will light when the P-12 amplifier output is approximately 3dB below clipping. (You will hear audible distortion if the amplifier is run at clipping.)

3.Headphone Phones/Speaker switch

When this switch is in the speaker position (out) the speaker out terminals on the back panel are active while the headphone jack on the front panel and the XLR headphone jack on the back panel are off. When this switch is in the headphone position (in), the headphone jack on the front panel and the XLR connector on the back panel are active and the speaker terminals are off.

4.Phones jack

This is a quarter inch tip ring sleeve headphone jack. The unit will operate properly with 8 Ohm to 600 Ohm headphone impedances.

Rear Panel

1.CH1 and CH2 Input Jacks

These jacks are quarter inch, unbalanced, audio inputs.

2.Headphone Out XLR

This headphone output XLR connector is active when the Headphone/Speaker switch is in the headphone position. When used with the US Audio Headphone Satellite boxes and standard microphone cables, the P-12 can drive multiple sets of headphones, with individual volume controls.

3.CH1 and CH2 Speaker Outputs

These speaker terminals are active when the Headphone switch on the front panel is in the speaker position. The P-12 will drive impedances of 4 Ohms or greater.

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Whirlwind P-12 owner manual CH1 and CH2 Input Jacks, CH1 and CH2 Speaker Outputs

P-12 specifications

The Whirlwind P-12, also known as the R-12, is a remarkable aircraft that has captured the attention of aviation enthusiasts and historians alike. Developed by the Whirlwind Aircraft Company in the 1930s, this exceptional aircraft combines advanced design principles with innovative technologies, making it a noteworthy addition to the pantheon of early aviation.

One of the standout features of the Whirlwind P-12 is its sleek, all-metal monoplane structure, which was a revolutionary design at the time. The aircraft’s design prioritizes aerodynamics, contributing to its impressive performance and efficiency in the air. The P-12 underwent extensive wind tunnel testing, ensuring that its shape minimized drag and maximized lift. This attention to aerodynamic detail is reflected in its smooth lines and efficient wing design.

The P-12 is powered by a powerful radial engine, delivering robust performance that enables it to reach impressive speeds. The use of a liquid cooling system enhances the engine's efficiency while ensuring optimal performance during demanding flight conditions. The combination of the aircraft’s lightweight structure and the powerful engine allows for exceptional maneuverability, making it ideal for both aerobatic displays and military applications.

Another key characteristic of the P-12 is its innovative flight control system, designed to provide responsive handling and stability. The aircraft features large ailerons and elevators that enhance its agility, allowing pilots to execute complex maneuvers with precision. This responsiveness was particularly advantageous in military settings, where quick reactions and nimble flying were crucial.

The interior of the P-12 was designed with the pilot's comfort in mind, featuring a well-appointed cockpit that provided excellent visibility and accessibility to controls. The ergonomic layout allowed for easy navigation even in challenging flying conditions.

Safety features were also integral to the aircraft’s design. The P-12 was equipped with a robust landing gear system that ensured stability during takeoff and landing, further enhancing the overall safety of the aircraft.

The Whirlwind P-12 not only stands out for its impressive technical specifications and performance characteristics but also represents a significant evolution in aircraft design of its era. Its impact on aviation continues to be felt, making it a beloved model among aviation aficionados and a symbol of early 20th-century technological advancement.