Semiconductors and ICs used: TL074 – TL072 - TIP31E – TIP32E
Infinity CMS 2 Subwoofer - Circuit DiagramDriver . . . . . . . . . . . . . .12" WooferSpecifications
Nominal Impedance . . .4 Ω
Enclosure Design. . . . . Tuned Port
Amplifier Power . . . . .100watts RMS
Frequency Response . . 30 Hz - 150 Hz (± 3dB)
Crossover Frequency . .50 to 20 0 Hz Continuously Variable.
Dimensions
Inches . . . . . . . . . . 14½ x 14½ x 14½"
Metric . . . . . . . . . . 36.8 x 36.8 x 36.8cm plus 1¼" (32mm) for feet
Shipping Weight. .43 lbs/19.5 Kg
Standby LED - The LED will light green when the unit is plugged in and is receiving signal. When in standby mode (when the Auto mode is active but the subwoofer is receiving no signal) the LED is red.
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 “subwoofer out” jacks. If a single cable mono or subwoofer source is connected to the BU2, a Y-cable must be connected to the subwoofer for full output.
Auto Power - This Auto On/Off switch controls whether the BU2’s Automatic turn-on circuit is active. When this switch is ON, the BU2 will turn itself on, indicated by a green LED, when it is plugged in and receiving a signal. When the BU2 has not received a signal for 8 - 10 minutes, the unit will revert to the STANDBY mode, indicated by a red LED. When this switch is OFF, the unit switches 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 AC LINE.
Crossover Frequency . .50 to 20 0 Hz Continuously Variable.
Dimensions
Inches . . . . . . . . . . 14½ x 14½ x 14½"
Metric . . . . . . . . . . 36.8 x 36.8 x 36.8cm plus 1¼" (32mm) for feet
Shipping Weight. .43 lbs/19.5 Kg
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 “subwoofer out” jacks. If a single cable mono or subwoofer source is connected to the BU2, a Y-cable must be connected to the subwoofer for full output.
Auto Power - This Auto On/Off switch controls whether the BU2’s Automatic turn-on circuit is active. When this switch is ON, the BU2 will turn itself on, indicated by a green LED, when it is plugged in and receiving a signal. When the BU2 has not received a signal for 8 - 10 minutes, the unit will revert to the STANDBY mode, indicated by a red LED. When this switch is OFF, the unit switches 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 AC LINE.
PREAMP/CROSSOVER SCHEMATIC 120V VERSION
POWER SCHEMATIC 120V VERSION
POWER SCHEMATIC 230V VERSION
TL071 and TL072 INTERNAL CIRCUIT
Click on the pictures to magnify
TEST PROCEDURE
Equipment needed:
Function/signal generator/sweep generator
Integrated Amplifier
Multimeter
Cables - line level (RCA) and speaker cables
General Function UUT = Unit Under Test
1. Connect both right and left line level inputs (RCA) to signal generator and UUT. Use Y-cable if necessary from mono source. VOLUME control should be full counterclockwise.
2. Turn on generator, adjust to 50mV, 50 Hz.
3. Plug in UUT; red LED should be ON. Turn VOLUME control full clockwise.
4. LED should turn Green; immediate bass response should be heard and felt from port tube opening.
5. Turn off generator, turn VOLUME control fully counterclockwise, and disconnect RCA cables.
6. Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amplifier fed by the signal generator.
7. Turn on generator and adjust so that speaker level output is 2.0V, 50 Hz. Turn VOLUME control full clockwise.
8. Green LED should light, immediate bass response should be heard and felt from port tube opening.
Sweep Function
1. Follow steps 1 - 4 above, using a sweep generator as a signal source.
2. Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test.
Driver Function
1. Remove driver from cabinet; detach + and - wire clips.
2. Check DC resistance of driver; it should be 3.3 ohms.
3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 5.0V.
4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
