Introduction
This manual provides essential instructions for the safe and efficient operation of your Ahuja UB-30 25W PA Amplifier. Please read this manual thoroughly before using the amplifier and retain it for future reference.
The Ahuja UB-30 is a compact 25W Public Address (PA) amplifier designed for various audio applications, offering versatile input and output options.
Important Safety Instructions
- Power Source: Connect the amplifier only to the specified AC mains voltage (220-240V, 50/60Hz) or a 12V DC car battery.
- Grounding: Ensure the equipment is properly earthed. Disconnect from mains before removing any covers.
- Ventilation: Do not block ventilation openings. Ensure adequate airflow around the unit to prevent overheating.
- Moisture: Do not expose the amplifier to rain or moisture to prevent fire or electric shock.
- Servicing: Refer all servicing to qualified service personnel. Do not attempt to service this product yourself.
- Placement: Place the amplifier on a stable, flat surface. Avoid placing it near heat sources or in direct sunlight.
Product Overview
The Ahuja UB-30 amplifier features multiple input channels and various speaker output options for flexible connectivity.
Figure 1: Front view of the Ahuja UB-30 amplifier, showing the control panel and power cable.
Figure 2: Rear view of the Ahuja UB-30 amplifier, displaying the power input, fuse, and speaker output terminals.
Controls and Connections
Front Panel Controls
Figure 3: Detailed view of the amplifier's front panel, highlighting input jacks and control knobs.
- MIC-1 Input: 6.3mm jack for microphone input.
- MIC-1 Volume Control: Adjusts the volume level for MIC-1.
- MIC-2/AUX Input: 6.3mm jack for microphone or auxiliary input.
- MIC-2/AUX Volume Control: Adjusts the volume level for MIC-2 or AUX input.
- TONE Control: Adjusts the tonal balance (bass/treble) of the output. Labeled 'CUT' to 'FLAT'.
- POWER Switch: Toggles the amplifier's power ON/OFF.
- POWER Indicator: Illuminates when the amplifier is powered ON.
Rear Panel Connections
Figure 4: Detailed view of the amplifier's rear panel, showing power input, fuse, and speaker terminals.
- AC Power Input: Connects to 220-240V AC mains supply.
- DC Power Input: Terminals for 12V DC car battery connection. Observe polarity (+/-).
- DC FUSE: T 6A L fuse for DC power protection.
- Speaker Outputs: Screw terminals for connecting speakers. Options include COM (Common), 4Ω, 8Ω, 16Ω, and 100V line output.
Setup
1. Unboxing and Inspection
Carefully remove the amplifier from its packaging. Inspect the unit for any signs of damage. Ensure all components are present.
2. Power Connection
The UB-30 can be powered by either AC mains or a 12V DC battery.
- AC Mains (220-240V): Connect the provided AC power cord to the AC power input on the rear panel and then to a suitable wall outlet.
- DC Battery (12V): For portable use, connect a 12V car battery to the DC input terminals on the rear panel. Ensure correct polarity: positive (+) to positive, negative (-) to negative.
Caution: Always ensure the amplifier is switched OFF before connecting or disconnecting power sources.
3. Speaker Connection
Connect your speakers to the appropriate terminals on the rear panel. Match the speaker impedance to the amplifier's output impedance for optimal performance and to prevent damage.
- Connect the common (negative) terminal of your speaker(s) to the COM terminal on the amplifier.
- Connect the positive terminal of your speaker(s) to the 4Ω, 8Ω, or 16Ω terminal, matching your speaker's impedance.
- For 100V line speakers, connect to the 100V terminal and COM. Ensure your speakers are compatible with 100V line systems.
Important: Do not connect speakers to multiple impedance terminals simultaneously. Ensure all connections are secure.
4. Input Device Connection
- Microphones: Connect microphones to the MIC-1 and/or MIC-2/AUX 6.3mm input jacks on the front panel.
- Auxiliary Devices: Connect audio sources like smartphones, CD players, or laptops to the MIC-2/AUX input jack using an appropriate cable.
Operating Instructions
1. Powering On
- Ensure all volume controls (MIC-1, MIC-2/AUX) are set to their minimum position (fully counter-clockwise).
- Press the POWER switch on the front panel to the 'ON' position. The power indicator light will illuminate.
2. Adjusting Volume
- For MIC-1, slowly turn the MIC-1 Volume Control clockwise until the desired sound level is achieved.
- For MIC-2 or AUX input, slowly turn the MIC-2/AUX Volume Control clockwise until the desired sound level is achieved.
- Avoid setting the volume too high, which can cause distortion or damage to speakers.
3. Tone Adjustment
Use the TONE Control knob to adjust the frequency response of the amplifier. Turning it towards 'CUT' will reduce higher frequencies (treble), while turning it towards 'FLAT' will provide a more balanced, full-range sound.
4. Powering Off
- Turn all volume controls to their minimum position.
- Press the POWER switch to the 'OFF' position. The power indicator light will turn off.
Maintenance
Cleaning
Wipe the exterior of the amplifier with a soft, dry cloth. Do not use liquid cleaners or abrasive materials, as they may damage the finish or internal components.
Fuse Replacement (DC Fuse)
If the amplifier fails to power on when using DC battery power, the DC fuse may need replacement. The fuse is located on the rear panel.
- Important: Disconnect all power sources (AC and DC) before attempting to replace the fuse.
- Unscrew the fuse holder cap on the rear panel.
- Remove the old fuse and replace it with a new fuse of the same type and rating (T 6A L).
- Securely screw the fuse holder cap back into place.
Caution: Always replace fuses with the specified type and rating to prevent damage to the amplifier or risk of fire.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power, power indicator off. |
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| No sound output. |
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| Distorted sound. |
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Specifications
| Feature | Detail |
|---|---|
| Power Output | 30W RMS Max., 25W RMS at 10% THD |
| Input Channels | 2 × Mic (1.0mV / 4.7kΩ), 1 × Aux (100mV / 470kΩ) |
| Speaker Outputs | 4Ω, 8Ω, 16Ω & 100V Line |
| Frequency Response | 150-10,000Hz ±3dB |
| Power Supply | AC: 220-240V 50/60Hz, DC: 12V (Car Battery) |
| Dimensions (L x W x H) | 12 x 20 x 28 Centimeters |
| Item Weight | 2.9 kg |
| Manufacturer | AHUJA |
| Country of Origin | India |
Figure 5: Size comparison of the Ahuja UB-30 amplifier, illustrating its compact dimensions.
Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact Ahuja customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.
Manufacturer: AHUJA
