4070 - 4 Ohm 3W Rectangular Speaker Full Range Audio Driver for Arduino & DIY

Specifications:

• Dimensions: 40mm x 70mm (Rectangular)
  
• Impedance: 4 Ohm
  
• Power Rating: 3 Watts (RMS)
  
• Type: Passive, Full-Range Audio Driver
  
• Mounting: Integrated M3 screw holes on the frame for easy installation
  
• Connectivity: Two-point solder pads for secure wiring

Key Applications & Projects

• Home Automation: Voice feedback for smart home hubs or security systems.
  
• Gaming: Compact stereo speakers for DIY RetroPie or MAME arcade builds.
  
• Industrial: Audible alerts and instructions for HMI panels and kiosks.
  
• Repair: High-quality replacement for flat-screen monitors and television internal speakers.

Project Evolution 

• Past Projects (Prerequisites): If you have mastered basic beep codes using a passive piezo buzzer, you are ready for this upgrade.
  
• Feature Upgrade: Transitioning from a buzzer to this 4070 driver unlocks High-Definition Voice Synthesis and music playback. Unlike buzzers, this speaker can reproduce complex waveforms, making your project sound professional.
  
• Effort/Requirements: Intermediate. Requires an external amplifier module (like the PAM8403) as microcontrollers cannot drive 3W speakers directly.

Virtual Technician & Wiring

⚠️ SAFETY WARNING: Never connect this speaker directly to an Arduino or ESP32 GPIO pin. Doing so will draw too much current and likely destroy your microcontroller. Always use an audio amplifier.
 
 Wiring Guide:

Connect Speaker (+) to the L-OUT+ or R-OUT+ on your amplifier.
Connect Speaker (-) to the L-OUT- or R-OUT- on your amplifier.
Ensure your amplifier is powered by a stable 5V source to prevent audio clipping.

Package includes:

1 X 4070 - 4 Ohm 3W Rectangular Speaker Full Range Audio Driver for Arduino & DIY

Frequently Asked Questions (FAQ)

1. Can I use this speaker with an Arduino?
   Yes, but only if you use an amplifier module like the PAM8403 between the Arduino and the speaker.
2. What is the distance between the mounting holes?
   The mounting holes are typically spaced at 33mm (vertical) and 63mm (horizontal) centers.
3. Is this speaker waterproof?
   No, this is a paper-cone speaker and should be kept away from moisture.
4. Does it come with wires pre-soldered?
   Usually, these come with solder tabs. We recommend using 24AWG wire for connections.
5. Can I use a 5W amplifier with this 3W speaker?
   Yes, but avoid turning the volume to 100% to prevent "blowing" the speaker cone.
6. What is the frequency response of the 4070?
   It is optimized for the human vocal range (approx. 200Hz - 15kHz).
7. Is 4 Ohm better than 8 Ohm for my project?
   4 Ohm speakers allow more current to flow, meaning they are generally louder at lower voltages (like 5V) compared to 8 Ohm speakers.
8. Can I use two of these for stereo sound?
   Absolutely. Use a 2-channel amplifier to create a compact stereo setup.
9. How do I mount this in an enclosure?
   Use M3 screws or strong double-sided mounting tape on the flat plastic rim.
10. Will this work with a Raspberry Pi?
    Yes, via the 3.5mm jack (with an amp) or via an I2S DAC/Amp shim.
11. Does this speaker require a crossover?
    No, it is a full-range driver and does not require a crossover.
12. Can it play bass music?
    While it handles mid-bass, the small size means it won't produce deep sub-bass frequencies.
13. Is the magnet shielded?
    No, avoid placing it directly against old CRT monitors or sensitive magnetic sensors.
14. What happens if I reverse the polarity?
    The speaker will still work, but the "phase" will be inverted. In a stereo setup, this might make the sound feel "hollow."
15. How much heat does it generate?
    The speaker itself generates very little heat, but the amplifier driving it might get warm.
16. Is this compatible with the ESP32 internal DAC?
    Yes, if fed through an amplifier.
17. Can I use this for a portable Bluetooth speaker?
    Yes, it is a very popular choice for DIY Bluetooth speaker builds due to its slim profile.
18. What is the depth of the speaker?
    The total depth including the magnet is approximately 18-20mm.
19. Can I use it as a microphone?
    Technically yes (speakers and mics are transducers), but the sensitivity will be very poor.
20. Is this speaker compatible with TV repair?
    Yes, the 4070 is a standard size for many 19-inch to 24-inch LED monitors and TVs.