INFINITY BU-1 - SCHEMATIC - POWERED SUB-WOOFER
SPECIFICATIONS
Driver è8"Woofer
Nominal
Impedanceè4
Enclosure
Design è Tuned
Port
Amplifier
Power è 50watts
RMS
Frequency
Response è 45Hz
- 150Hz (± 3dB)
Crossover
Frequency è 50to150HzContinuously
Variable
Inputs
Line Level è
RCAjacks
High Level è (Speaker) Input
terminals
Outputs è Full range Speaker
Sensitivity
Low Level è 50mV
High level è 1V
Input
Impedance
Low Level è 10k
High level è 4.7k
Dimensions
Inches è 11½x11½x11½"
Metric è
29.2 x 29.2 x 29.2cm plus 1¼" (32mm) for feet)
Auto Power
This Auto
On/Off switch controls whether the BU1’s Automatic turn-on circuit is active.
When the switch is ON, the BU1 will turn itself on, indicated by a green LED,
when it is plugged in and receiving a signal. When the BU1 has not received a
signal for approximately ten minutes, the unit will revert to the STANDBY mode,
indicated by a red LED. When this switch is OFF, the unit will revert to the
STANDBY mode and will stay OFF, regardless of input signal. THIS IS NOT
A TRUE AC
POWER SWITCH AS IT DOES NOT DISCONNECT THE AMPLIFIER FROM THE 120VAC LINE.
High Level
Inputs
These High
Level Inputs are for receivers that do not have line-level “pre-amp out” or
“subwoofer out” jacks. When a pair of main or satellite speakers are attached
to the OUTPUT terminals, they are driven the full range of frequencies as
generated by the music source (receiver, amplifier, etc.)
Low Level
Input
These left
and right Line Level Inputs are normally used when the receiver/processor has
line-level “pre-amp out” or “sub-woofer out” jacks. If a single cable mono
or sub-woofer
source is connected to the BU1, a Y-cable must be connected to the sub-woofer
for full output.
Volume
Control
This
controls the volume level of the sub-woofer.
Frequency
The Frequency adjustment determines the upper
corner roll-off point for the BU1.
{If a problem
you are experiencing is a common (although not serious) one. It seems the "standby",
or muting circuit for the BU-1 subwoofer is very sensitive. It senses any small
voltage at either the low level or high level inputs as an input signal and
will turn the unit on. This includes above-average DC offset on the customer's
receiver/power amplifier, small amounts of 60 Hz hum or noise picked up by the
customer's input cables, etc. Since the initial testing and development of the
unit involved high quality audio equipment and connections, this tendency did
not surface at that time. The muting, or
stand-by circuit electronically shuts down the bias voltages to the amplifier section.
It does not turn off the unit's power supply. When the unit is idle it's
drawing about as much power as a 17 watt light bulb, whether or not the muting
circuit is activated. So the unit is electrically safe to leave turned on
constantly no matter what color the LED is at the time, and of
course sonically it's completely harmless.
This is not a serious problem.}
PRE-AMP SCHEMATIC
POWER AMP SCHEMATIC
230V_FEATURE
CLICK ON THE PICTURES TO MAGNIFY
