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RCF SUB-708AS-MK2: Active 18
RCF SUB-708AS-MK2: Active 18
RCF SUB-708AS-MK2: Active 18
RCF SUB-708AS-MK2: Active 18
RCF SUB-708AS-MK2: Active 18
RCF SUB-708AS-MK2: Active 18
RCF

RCF SUB-708AS-MK2: Active 18" Subwoofer with 3" Voice Coil

★★★★★5.0 (2 reviews)
400WXLR

Professional active 18-inch subwoofer delivering 1400 watts of deep, controlled bass for live sound reinforcement.

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Overview

The RCF SUB-708AS-MK2 is an active subwoofer designed for professional live sound environments where powerful, well-defined bass is non-negotiable. At its core is an 18-inch woofer paired with a 3-inch voice coil, engineered to move large volumes of air while maintaining control at high output levels. The built-in 1400W amplifier is matched to the driver, which means the subwoofer arrives ready to perform without the need for external amplification — reducing rack gear, cabling, and setup time.

Integration with existing PA systems is made straightforward through stereo XLR inputs and outputs, switchable crossover frequencies, and a phase reverse function. These controls let you dial in the sub's performance relative to your top cabinets without relying on an external processor for basic system tuning. Whether you are reinforcing a band on a festival stage, providing low end for a DJ setup, or anchoring a house-of-worship sound system, the SUB-708AS-MK2 delivers the kind of consistent, deep output that professional applications demand.

Key Features

1,400W Powered Subwoofer with 18" Woofer

Switchable Crossover Frequencies

Stereo XLR Inputs

Stereo Crossover

Phase Reverse

Specifications

Type
Active Subwoofer
Woofer Size
18 inches
Voice Coil
3 inches
Amplifier Power
1400W
Inputs
Stereo XLR
Outputs
Stereo XLR
Crossover
Switchable Crossover Frequencies
Phase
Phase Reverse

Pros & Cons

👍 Pros

  • 1400W onboard amplifier eliminates the need for a separate power amp and simplifies setup
  • 18-inch woofer with 3-inch voice coil delivers deep, powerful bass with high output capability
  • Switchable crossover frequencies allow flexible integration with a variety of top speakers
  • Stereo XLR inputs and outputs make daisy-chaining and system expansion straightforward
  • Phase reverse switch ensures proper alignment with the rest of your PA system

👎 Cons

  • An 18-inch active subwoofer is heavy and bulky, making transport and load-in physically demanding
  • Higher price point compared to passive subs, though it eliminates separate amplifier costs
  • Single 18-inch driver design means pairing two units may be necessary for larger venues
  • High SPL output requires careful placement and tuning to avoid overwhelming mid-size rooms

Frequently Asked Questions

It features a built-in 1400W amplifier, so no external power amp is needed.
Yes, it includes switchable crossover frequencies so you can match it to your main speakers without an external crossover processor.
It has stereo XLR inputs and stereo XLR outputs for daisy-chaining to additional speakers or tops.
Yes, a phase reverse function is included, allowing you to align its output with your main speakers for coherent bass reproduction.
It uses an 18-inch woofer with a 3-inch voice coil, designed for high power handling and deep low-frequency extension.

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