CC8-SUB: How To Tap / Set

Introduction

The Rockville CC8 70V Subwoofer is designed to work seamlessly in large-scale audio setups where multiple speakers need to be powered efficiently. 70V technology allows multiple speakers to be connected over long distances without requiring a large amplifier.

In this guide, we will cover:

• What 70V technology is
• How to set the tap for your CC8 subwoofer
• How to wire it into a 70V system

What is 70V Technology?

A 70V system enables you to connect multiple speakers across large areas without needing an amplifier with excessive power. Each 70V speaker has a built-in transformer that allows it to draw a fixed amount of wattage from the amplifier, ensuring consistent volume and power distribution.

Why is Tapping Important?

Tapping lets you control how much power the speaker pulls from the amplifier. Properly setting taps ensures:

Your amplifier isn’t overloaded
Speakers receive the correct power level
Balanced sound distribution across your system

Step 1: Setting the Tap on Your CC8 Subwoofer

The tap setting determines how much power the subwoofer draws from your amplifier.

How to Adjust the Tap Setting

1. Remove the magnetic grille from the front of the subwoofer.
2. Locate the tap selector (marked inside).
3. Use a flathead screwdriver to rotate the selector to your desired wattage.

Tap Settings Available on the CC8

Tip:

• Lower tap settings are best for background music.
• Higher tap settings (like 50W) will provide deeper bass and better performance.
• If using an 8Ω amplifier, set the tap to 8Ω mode.

Step 2: Calculating Your Amplifier Power Needs

Before wiring your system, ensure your amplifier can handle all speakers.

Formula:
Total Power Required = (Number of Speakers) × (Wattage per Speaker)

Example:

• 10 speakers tapped at 10W each → 100W total
• Choose an amplifier rated for at least 110W to ensure smooth operation.

Tip: Always select an amplifier with slightly more power than needed to avoid strain.
 

Step 3: Wiring the Subwoofer in a 70V System

The CC8 uses parallel wiring, meaning all speakers receive the same signal level.

Using the Quick-Disconnect Terminal

On the back of the subwoofer, locate the green quick-disconnect terminal block.

1. Pull the terminal block out from the subwoofer.
2. Identify terminal connections (a diagram is on top of the block).
   • Inner two terminals → Signal IN (from amplifier or previous speaker)
   • Outer two terminals → Signal OUT (to next speaker)

Connecting Speaker Wires

1. Insert speaker wire from the amplifier:
   • Positive (+) wire → Connect to first inner terminal.
   • Negative (-) wire → Connect to second inner terminal.
2. Insert speaker wire going to the next speaker:
   • Positive (+) wire → Connect to first outer terminal.
   • Negative (-) wire → Connect to second outer terminal.
3. Push the terminal block back into the subwoofer.

Tip:

• Use high-quality 70V speaker wire for longer distances.
• Ensure all connections are secure before powering on the system.

Step 4: Completing Your 70V Speaker Chain

• Repeat the wiring process for each speaker in the chain.
• Double-check that all speakers are tapped correctly.
• Power on your amplifier and test for balanced sound.

Conclusion

The Rockville CC8 70V Subwoofer is easy to integrate into commercial and residential audio systems. With proper tapping and wiring, you can ensure optimal performance and longevity.

Key Takeaways: 

Set the correct tap level based on your power needs.
Calculate amplifier requirements to prevent overload.
Use parallel wiring for proper signal distribution.
Test your system before finalizing the setup.