Whirlwind P-12 User Manual

US Audio

whirlwind

99 Ling Road. Rochester NY 14612 [phone]

Fax: [phone]

[e-mail]

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.

2.

3.

4.

1.

2.

3.

Channel and 2 volume controls

These knobs vary the amplifier output level.

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.)

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.

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

CH1 and CH2 Input Jacks

These jacks are quarter inch, unbalanced, audio inputs.

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.

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.

SPECIFICATIONS

Frequency response
Output power
(both channels driven)
Signal to noise ratio
Input impedance maximum
Input level output protection
Minimum output impedance

THD
Rise time
Equivalent input noise
Maximum output level

20Hz to 30kHz + or - 3dBm

11Watts RMS into 8 Ohms
14Watts RMS into 4 Ohms
Greater than 90dBm
20kOhms unbalanced
+16dBm.
Thermal and short circuit protected 4
Ohms
.2 % at 6W
3uSec

-78dBm
+18dBm