OWI User Manual: Model AMP1SGRN Speaker Amplifier with Priority Audio Override
OWI Model AMP1SGRN Manual Page 7 of 28
Introduction
The OWI
AMP1SGRN
is a self powered speaker/amplifier. This unit can drive up to four
speakers connected series parallel to have a net impedance of 8 ohms. With an included UL
Listed,
Level 5
(Energy Star)
, 15 volt, 3.5 ampere power supply, the amplifier can output 32
watts, or 8 watts per speaker in a four speaker hook-up.
Special features of the OWI Mode AMP1SGRN include
:
Energy Star Sleep Mode
If no audio is present on any input for a nominal, factory set, delay time of 2 minutes, the
power amplifier is put into a low power “shutdown” mode. The delay time is settable, but for
Energy Star rating, the maximum time is 30 minutes, the factory set time is 2 minutes. During
sleep mode, power consumption of the speaker amplifier is less than one (1) watt. The power
supply, during sleep mode, draws a very small power.
Three audio inputs: Normal, Auxiliary and Priority Override
The
Normal
input accepts a balanced input via a Phoenix style screw terminal plug (A9) or an
unbalanced input via minijack A12. The A12 input can be microphone level or line level, set by
A10. The line level can range from -20dBu to 0dBu. The microphone level input can be
-40dBu. The minijack can accept mono or stereo inputs. The stereo channels are summed
together. This audio is adjusted with potentiometer adjacent to “Auxiliary Input”. This input is
muted during Priority Override. One use of the auxiliary input is for an infrared microphone.
Priority Override Feature
The
Priority
input accepts balanced input levels of jumper selected 100 volts audio, 70 volts
audio, 25 volts audio and 1 volt (approximately line level) audio. Audio on the
Priority
input
suspends audio on the
Normal
or
Auxiliary
input and switches the speaker amplifier to pass
the
Priority
audio (A8). After the
Priority
audio stops, the unit waits a selectable time delay
before returning to the
Normal
or
Auxiliary
audio input. The delay is computer settable via
RS232 from 5 to 60 seconds. With an adapter, the USB connector on a computer can be used
to set the delay.
Self Test Feature
This unit self tests itself by looking for a disconnected speaker string or otherwise high
impedance. The self test occurs when either a manual button is pressed or when it is
commanded by a computer. A good test is signaled by two flashes of a green LED and an
RS232 output of “OKAY”. A bad test is signaled by two flashes of a red LED and an RS232
output of “FAIL”. The test uses a low frequency sine wave and it senses the audio current
before and during the low frequency sine wave. The self test doesn’t interfere with the other
audio inputs and outputs.
