RHPA4: How To Set Up & Use

Introduction

The Rockville RHPA4 4-Channel Headphone Amplifier is a versatile solution for podcasters, recording artists, and bands. It allows multiple users to monitor audio with high sound quality, making it ideal for setups where multiple headphones need to be used simultaneously. Whether you're recording a podcast, rehearsing with a band, or simply monitoring sound during a recording session, this headphone amplifier provides clear and reliable audio for all participants.

What You’ll Need

• RHPA4 4-Channel Headphone Amplifier
• Power cable and USB adapter (included)
• Quarter-inch TRS cables (for connecting to interfaces or mixers)
• Headphones (multiple if necessary)
• Audio interface, mixer, or another audio source
• USB block or power outlet (for powering the amp)

Step-by-Step Instructions

1. Set Up Power

• Connect the Power Cable: Plug the DC 5V USB cable into the amplifier’s power input, then connect the other end to a power outlet using the USB block or to a laptop.
• Power On: Once connected, you’ll see the power light lit up, indicating the amplifier is powered on.

2. Connect the Audio Source

The RHPA4 offers three input options:

• Quarter-Inch TRS Input: Ideal for connecting an audio interface or mixer with a quarter-inch headphone output.
• 3.5mm Aux Input: Can be used to connect a phone, tablet, or smaller audio devices.
• XLR Input: Also available for connecting to an interface or mixer with an XLR output.

For this setup, we’ll use a quarter-inch TRS cable to connect the headphone amplifier to the audio interface.

• Plug into the Interface: Take one end of the quarter-inch TRS cable and plug it into the quarter-inch headphone output of your interface or mixer.
• Connect to the Amplifier: Plug the other end of the TRS cable into the quarter-inch input on the back of the headphone amplifier.

3. Connect Headphones

• Choose a Channel: Plug your headphones into any of the available output channels on the front of the amplifier. The RHPA4 has four quarter-inch outputs and three 3.5mm outputs, allowing multiple headphones to be connected simultaneously.
• Adjust Volume: Each channel has its own volume control, so adjust the volume knob on the amplifier to your desired level.

4. Adjust the Settings for Your Setup

• Mic Gain and Interface Volume: On your interface, raise the gain on your microphone or instrument channel to ensure it’s sending a strong signal.
• Monitor Volume: Raise the headphone volume on the headphone amplifier. You can adjust this based on how loud you want the signal in your headphones.
• Monitor Sound: Put on your headphones, and you should hear the audio from your microphone or instruments in real-time.

5. Set Stereo or Mono Mode

• Stereo Mode: If you prefer to hear separate left and right tracks, set the stereo/mono switch to stereo. This will give you full stereo separation in your headphones.
• Mono Mode: Set the switch to mono if you want to hear all channels equally from both sides of your headphones, which is useful in certain recording or live environments.

6. Use Multiple Headphones

• Multiple Headphones on One Channel: You can connect two headphones to each channel by using both the quarter-inch and 3.5mm outputs. However, both headphones will share the same volume control for that channel.
• Connect More Headphones with Additional Amplifiers: To connect more than four headphones, simply use the 3.5mm output of the first headphone amplifier and connect it to the 3.5mm input of another RHPA4 unit. This will allow you to connect up to 16 headphones.

7. Band Rehearsal Setup (Optional)

• Using with a Mixer: For band rehearsals, connect the headphone amplifier to your mixer using a quarter-inch cable.
• Adjust Mixer Settings: Set the gain on your microphone or instrument channel and raise the main left and right faders on the mixer to send audio to the amplifier.
• Volume Control: Adjust the headphone volume on your mixer to ensure the sound is sent through the amplifier to the headphones.

8. Testing the Setup

• Test with Audio: Play some audio through your interface, mixer, or another connected device. You should now hear the audio from your headphones, whether it’s a recording, live sound, or a podcast.
• Fine-Tune: Adjust the volume on the amplifier and interface to balance the levels. Make sure everyone using headphones has a good listening level.

Conclusion

Setting up the Rockville RHPA4 4-Channel Headphone Amplifier is quick and easy. It’s a great solution for podcasters, recording artists, and band members who need to hear themselves or each other during recording sessions or rehearsals. With the ability to connect multiple headphones and adjust the sound quality, this amplifier ensures everyone has a clear and balanced listening experience.