TKL Z4 4-Channel DSP Audio Mixer

1. Introduction

Thank you for choosing the TKL Z4 Professional Audio Mixer. This compact and versatile 4-channel mixer is designed for a wide range of audio applications, from studio recording and live streaming to DJ performances and karaoke. It features 99 built-in DSP effects, 48V phantom power for condenser microphones, USB connectivity for direct computer integration, and Bluetooth 5.0 for wireless audio streaming. Please read this manual thoroughly to ensure proper setup and operation of your new mixer.

2. Product Features

• Multi-Function Mixer: Can be connected directly to a computer for use.
• 99 DSP Special Effects: Includes Reverb, Delay, Pingpong Delay, Flanger, Key Echo, Chorus+Echo, Auto Wah+Echo, Voice Changer, Tremolo, Rotary Speaker, and more.
• High Fidelity Sound Quality: Equipped with new fidelity chips for lower noise and better sound restoration.
• Wireless Bluetooth 5.0: Fast and lossless Bluetooth transmission for audio streaming.
• 48V Phantom Power: Full range of support for capacitor/wired microphones.
• USB Connectivity: Easy connection to computers for live streaming and recording.
• Flash Drive Playback: Supports MP3/U disk/SD card playback.
• Balanced Regulation: Independent Treble, Tenor, and Bass adjustment knobs for precise sound tuning.
• Low Cut Button: Attenuates frequencies below 80Hz to reduce unwanted vibration and wind noise from microphones.
• Attenuating Switch (PAD): Reduces input signal by 26dB for high-level sources.
• Volume Faders: Durable straight slide faders for precise level control.

Figure 1: TKL Z4 Mixer highlighting key features.

3. Safety Information

Please observe the following safety precautions to prevent damage to the device or injury to yourself:

• Do not open the casing. There are no user-serviceable parts inside. Refer all servicing to qualified personnel.
• Keep the device away from water, moisture, and extreme temperatures.
• Ensure proper ventilation to prevent overheating.
• Use only the provided power adapter or one with identical specifications.
• Avoid placing heavy objects on the device.
• Disconnect power during lightning storms or when unused for long periods.

4. Product Overview: Controls and Interfaces

Familiarize yourself with the various controls and connection points on your TKL Z4 mixer.

Figure 2: Front panel diagram with labeled controls.

Front Panel Controls:

• MIC / LINE Inputs: XLR and 1/4" TRS combo jacks for microphones and line-level instruments.
• PAD Switch: Attenuates input signal by 26dB.
• HPF (Low Cut) Switch: High-Pass Filter, cuts frequencies below 80Hz.
• GAIN Knob: Adjusts input sensitivity for each channel.
• HIGH, MID, LOW Knobs: 3-band equalizer for Treble, Tenor (Mid), and Bass frequencies.
• FX SEND Knob: Controls the amount of signal sent to the internal DSP effects processor.
• LEVEL Knobs: Adjusts the output level for each channel.
• DSP Display: Shows the selected effect number.
• PROGRAM Knob: Selects one of the 99 DSP effects.
• PARAMETER Knob: Adjusts parameters of the selected DSP effect.
• MAIN METERS: LED indicators for main output level.
• PHANTOM Switch: Activates 48V phantom power for condenser microphones.
• USB TO PC / Bluetooth Module: Digital interface for computer connection and Bluetooth audio.
• PREV/V-, NEXT/V+, P/P, MODE Buttons: Controls for USB/Bluetooth playback.
• MP3/USB/Bluetooth Level Knob: Adjusts the volume of the digital input.
• STEREO Fader: Master volume control for the main stereo output.
• PHONES Output: 1/4" TRS jack for headphone monitoring.
• L STEREO OUT R: Main stereo output (XLR).
• FX SEND Output: 1/4" TRS output for sending signal to external effects processors.
• 3/4 RCA Inputs: Auxiliary stereo input for devices like mobile phones or media players.

Rear Panel Controls:

• POWER SWITCH: Turns the mixer on/off.
• POWER INTERFACE: Connects to the external power adapter.

5. Setup Instructions

5.1 Power Connection

Connect the provided power adapter to the POWER INTERFACE on the rear of the mixer and then to a suitable power outlet. Ensure the POWER SWITCH is in the 'OFF' position before connecting. The mixer supports various mains voltages depending on your region:

• USA/Canada: ~120V AC, 60 Hz
• U.K./Australia: ~240V AC, 50 Hz
• China: ~220V AC, 50 Hz

Please verify the correct plug type and voltage for your region. The mixer operates internally at 12V DC.

5.2 Microphone and Line Input Connection

Connect microphones or line-level instruments to the MIC / LINE inputs. For condenser microphones, activate the 48V PHANTOM switch. For high-level input sources, press the PAD switch to reduce the input signal by 26dB and prevent clipping.

Figure 3: Activating 48V Phantom Power for condenser microphones.

5.3 Computer Connection (USB)

Connect the mixer to your computer using a USB cable. The mixer will function as an audio interface, allowing you to record audio from the mixer to your computer or play audio from your computer through the mixer. No special drivers are typically required for most operating systems.

Figure 4: Connecting the mixer to a computer via USB.

5.4 Bluetooth Connection

To connect a Bluetooth device:

1. Press the MODE button on the USB/Bluetooth module until 'BLUE' appears on the DSP display.
2. On your smartphone or other Bluetooth device, search for available Bluetooth devices and select 'TKL Z4'.
3. Once connected, you can stream audio wirelessly to the mixer.

Figure 5: Bluetooth 5.0 connectivity.

5.5 USB Flash Drive / SD Card Playback

Insert a USB flash drive or SD card (via a USB card reader) into the USB port. The mixer will automatically detect and play MP3 files. Use the PREV/V-, NEXT/V+, P/P buttons to control playback.

Figure 6: USB flash drive playback.

5.6 Output Connections

Connect your main speakers or power amplifier to the L STEREO OUT R (XLR) outputs. For headphone monitoring, connect headphones to the PHONES output.

6. Operating Instructions

6.1 Basic Operation

1. Turn on the mixer using the POWER SWITCH.
2. Adjust the GAIN knob for each input channel to achieve an optimal signal level without clipping (the PEAK LED should only flash occasionally).
3. Use the HIGH, MID, and LOW EQ knobs to shape the tone of each channel.
4. Adjust individual channel LEVEL knobs to balance the mix.
5. Control the overall output volume with the STEREO fader.

6.2 Using DSP Effects

The TKL Z4 mixer includes 99 digital signal processing (DSP) effects:

• 00-39: Reverb
• 40-49: Delay
• 50-59: Pingpong Delay
• 60-69: Flanger
• 70-79: Key Echo
• 80-84: Chorus+Echo
• 85-89: Auto Wah+Echo
• 90-93: Voice Changer
• 94-96: Tremolo
• 97-99: Rotary Speaker

To apply effects:

1. Turn the PROGRAM knob to select the desired effect number (00-99). The selected number will appear on the DSP display.
2. Adjust the FX SEND knob on each channel to send the desired amount of that channel's signal to the effects processor.
3. Use the PARAMETER knob to fine-tune the selected effect (e.g., decay time for reverb, delay time for delay).

Figure 7: DSP effects selection.

6.3 Equalization

Each channel features a 3-band EQ:

• HIGH: Adjusts frequencies around 10kHz.
• MID: Adjusts frequencies around 2.5kHz.
• LOW: Adjusts frequencies around 80Hz.

Figure 8: Equalization controls.

6.4 Low Cut Function

The HPF (High-Pass Filter) or Low Cut switch on each MIC/LINE channel attenuates frequencies below 80Hz. This is useful for reducing unwanted low-frequency rumble, stage noise, or microphone handling noise.

Figure 9: Low Cut button functionality.

6.5 Product Demonstration Video

Watch this video for a visual guide on the mixer's features and operation:

7. Maintenance

• Cleaning: Use a soft, dry cloth to clean the mixer's surface. Do not use liquid cleaners or solvents.
• Storage: Store the mixer in a cool, dry place away from direct sunlight and extreme temperatures.
• Cable Care: Always grasp the plug, not the cable, when disconnecting. Avoid bending or crimping cables.
• Ventilation: Ensure the ventilation openings are not blocked to prevent overheating.

8. Troubleshooting

9. Specifications

Figure 10: Mixer dimensions.

10. User Tips

• Power Voltage: Always confirm the power supply voltage and plug type are compatible with your region before connecting. The mixer itself operates on 12V DC, but the external adapter handles the AC conversion.
• Auxiliary Input: The 3/4 RCA inputs are perfect for connecting mobile phones or other devices via an AUX cable for background music or additional audio sources.
• Computer Connectivity: If experiencing issues with computer connection (e.g., with a MacBook), ensure your operating system's audio input/output settings are correctly configured to recognize the mixer. Sometimes, a simple restart of both devices can resolve connection problems.
• SD Card Recording: While the mixer supports SD card playback via a USB card reader, direct recording to an SD card is not explicitly stated as a feature. For recording, use the USB connection to a computer with appropriate recording software.
• Active Speakers: The TKL Z4 audio mixer is compatible with active (powered) speakers. Connect them to the L STEREO OUT R (XLR) outputs.

11. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase. The manufacturer is committed to providing high-quality products and excellent customer service.