1. Introduction
The COOLMUSIC DK35S is a versatile 50W multi-function amplifier designed for various electronic instruments, including electric drums, keyboards, and microphones. It features Bluetooth connectivity, USB input, and a recording function, making it suitable for practice, small performances, and home studio use. This manual provides detailed instructions for safe and effective operation of your DK35S amplifier.
2. Key Features
- 50W Output Power: Equipped with a 10-inch woofer and a 3.0-inch tweeter for rich tone.
- Multi-Instrument Compatibility: Functions as an amplifier for acoustic guitars, keyboards, bass guitars, and electronic drums.
- Dual Instrument Inputs: Two 1/4" instrument input, 3-band EQ, Tone and Gain control.
- XLR Microphone Input: Dedicated XLR input for microphones with Reverb control.
- Bluetooth & USB Connectivity: Built-in Bluetooth and MP3 functions for playing background music from phones or PCs.
- Recording Function: One-key record knob allows users to record their performance.
- Headphone Output: Includes an earphone socket for private monitoring.
- D.I. Output: Direct Injection output for connecting to a mixing console or another amplifier.
- Durable Design: Irregular shape style cabinet designed for drop resistance and easy portability with a durable hand belt.
3. Setup Guide
3.1 Unpacking and Placement
Carefully remove the DK35S amplifier from its packaging. Place the amplifier on a stable, flat surface. The unique cabinet design allows for angled placement, which can optimize sound projection depending on your listening position.
Figure 3.1: The COOLMUSIC DK35S amplifier, showcasing its angled cabinet design for enhanced sound projection and drop resistance.
3.2 Power Connection
Connect the provided power cord to the amplifier's power input on the rear panel and then to a suitable electrical outlet. Ensure the power switch is in the OFF position before connecting. Once connected, you can turn the power switch ON. A blue indicator light on the control panel will illuminate.
Figure 3.2: Rear panel of the DK35S, illustrating the power input, fuse, and power switch for safe connection.
Video 3.1: A short demonstration of connecting the power cable and turning on the amplifier, showing the blue indicator light.
3.3 Instrument and Microphone Connections
The DK35S features multiple input options. Connect your instruments (electronic drums, keyboards, guitars) to the 1/4" LINE inputs. For microphones, use the XLR MIC input. Ensure all cables are securely connected.
Figure 3.3: Connection diagram for microphone, keyboard, and electronic drums to the DK35S amplifier.
4. Operating Instructions
4.1 Control Panel Overview
The front panel of the DK35S amplifier provides access to all controls for inputs, effects, and volume. Familiarize yourself with the layout before operation.
Figure 4.1: Labeled control panel of the DK35S amplifier, indicating all knobs and inputs.
4.2 Adjusting Sound
- GAIN: Adjusts the input sensitivity for each channel. Start with a low setting and increase gradually to avoid distortion.
- TONE: Controls the overall tonal character for instrument inputs.
- BASS/TREBLE: Fine-tune the low and high frequencies for instrument inputs.
- REVERB: Adds a reverberation effect, primarily for the microphone input.
- VOLUME: Master volume control for the entire amplifier output.
4.3 Bluetooth Connectivity
To connect a Bluetooth device:
- Ensure the amplifier is powered on.
- Activate Bluetooth on your mobile device or computer.
- Select "Coolmusic" from the list of available devices.
- Once paired, the Bluetooth indicator light on the amplifier will stabilize, and you can play audio through the amplifier.
Figure 4.2: A smartphone displaying its Bluetooth settings, connected to the "Coolmusic" amplifier.
Video 4.1: A demonstration of connecting a keyboard to the DK35S amplifier and playing music, showcasing the amplifier's sound output.
4.4 Recording Function
The DK35S includes a one-key record function. Connect a USB drive to the USB input. Press the "Record" button to start recording your performance. Press it again to stop. The recorded audio will be saved to the USB drive.
4.5 Headphone and D.I. Outputs
- PHONES: Connect headphones to this output for private monitoring. The main speaker output will be muted when headphones are connected.
- D.I. OUT: Use this XLR output to send a balanced signal directly to a mixing console or another amplifier for larger sound systems or recording.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the amplifier. Avoid using abrasive cleaners or solvents.
- Storage: Store the amplifier in a cool, dry place away from direct sunlight and extreme temperatures.
- Transportation: Utilize the durable hand belt for easy and safe transportation. The robust cabinet design helps protect against minor impacts.
Figure 5.1: The DK35S amplifier being carried, highlighting its portability and integrated handle.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord not connected, power switch off, blown fuse. | Check power cord connection, ensure switch is ON, replace fuse if necessary. |
| No sound from instrument | Volume too low, incorrect input selected, faulty cable, instrument not powered. | Increase volume, check input connections, test with a different cable, ensure instrument is on. |
| Distorted sound | GAIN too high, VOLUME too high, faulty instrument/cable. | Reduce GAIN and VOLUME, test with different instrument/cable. |
| Bluetooth not connecting | Bluetooth not enabled on device, amplifier not in pairing mode, device too far. | Ensure Bluetooth is on and discoverable, restart amplifier and device, move closer. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | COOLMUSIC |
| Model Name | DK35S |
| Output Wattage | 50 Watts |
| Speaker Configuration | 10-inch woofer, 3.0-inch tweeter |
| Number of Bands EQ | 3 (Bass, Mid, Treble) |
| Inputs | 2 x 1/4" Instrument, 1 x XLR Microphone, USB |
| Outputs | 1 x 1/4" Headphone, 1 x XLR D.I. Out |
| Connectivity | Bluetooth, USB |
| Power Source | Corded Electric |
| Material | Plastic (Enclosure) |
| Color | Black |
8. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or visit the official COOLMUSIC website. Keep your purchase receipt as proof of purchase for any warranty claims.
