Mackie SR18S 18" 1600W Professional Powered Subwoofer

The Mackie SR18S is a professional 18" powered subwoofer with a mighty 1600W Class D amplifier, designed to add serious low-end authority to any modern PA system. Packed with advanced acoustic processing, flexible voicing modes and robust protection, it delivers deep, punchy bass that stays controlled and musical, gig after gig.

Whether you are a working band, DJ, venue or events company, the SR18S slots straight into your existing rig and immediately boosts overall system performance. By taking care of the heavy lifting in the low frequencies, it frees up your full-range tops to sound cleaner and louder, while Mackie’s transparent limiting keeps everything safe without choking your sound.

Powerful, Controlled Low End

At the heart of the SR18S is a 1600W Class D amplifier driving a custom high-efficiency 18" transducer. This combination delivers impressive low-frequency extension from 33 Hz up to 200 Hz with a maximum SPL of 133 dB, giving your kick drums, synth bass and backing tracks the weight and impact they deserve. The amp is engineered for consistent, ultra-reliable performance, so you can push your system hard without worrying about thermal issues or unexpected shutdowns.

Smart Processing That Protects Your Sound

Instead of simply clamping down on the overall output when levels get hot, the SR18S uses processor-controlled system monitoring and multi-band compression. It analyses the incoming signal in real time and only tames the specific frequency areas that need attention, maintaining tonal balance and low-end punch even under heavy limiting. Input limiting also keeps overly hot signals in check, helping you avoid distortion and protecting both the amplifier and driver without sacrificing clarity.

Flexible Voicing For Any Gig

Selectable voicing presets make it easy to tailor the SR18S to your music and venue. Flat mode offers a natural balance between depth and output for general use, Deep mode emphasises ultra-low frequencies for dance, rap and electronic sets, while Punch mode prioritises maximum impact and headroom, ideal for rock bands and high-energy live shows. A variable crossover and polarity invert switch further refine how the sub integrates with your tops.

Built-Like-A-Tank Construction

The SR18S is built around a rugged wooden cabinet with a tough steel grille, ready to withstand the knocks of regular transport and stage use. Despite its solid build, it remains manageable in weight for loading in and out of venues. An integrated M20 threaded pole cup allows for straightforward deployment with compatible full-range loudspeakers, making it easy to create a clean, professional-looking PA stack.

Versatile Connectivity And System Integration

With stereo XLR inputs, full-range XLR outputs and high-pass XLR outputs, the SR18S offers multiple configuration options for single or dual sub setups. You can run stereo or mono-summed operation, adjust the output level to match your system, and even defeat the front LED if you prefer a more discreet stage presence. A universal power supply with Power Factor Correction ensures stable operation across a wide range of mains conditions, ideal for touring and mobile rigs.

• 1600W Class D Power - The high-output Class D amplifier delivers up to 1600W of power for deep, room-filling bass and a maximum SPL of 133 dB. This gives your PA the headroom it needs to handle demanding material without strain, keeping your low end tight and controlled at any volume.
• Custom 18" High-Efficiency Driver - A purpose-designed 18" transducer provides extended low-frequency response from 33 Hz to 200 Hz with excellent punch and definition. By handling the lows more efficiently, it allows your full-range loudspeakers to focus on mids and highs, improving overall clarity and system efficiency.
• Advanced Protection And Multi-Band Limiting - Dedicated processing constantly monitors the amplifier and incoming signal, applying intelligent multi-band compression only where needed. This maintains your chosen tonal balance and perceived loudness while protecting the system, so you avoid the dull, pumping sound associated with more basic limiters.
• Flexible Voicing And Connectivity - Flat, Deep and Punch voicing presets, a variable crossover, polarity invert and variable level control make it simple to integrate the SR18S into almost any PA. Stereo inputs and both full-range and high-pass outputs support a wide range of setups, from a single sub with two tops to more complex multi-sub systems.

General

• Product: Mackie SR18S 18" Professional Powered Subwoofer
• Application: Live sound, DJs, events, venues and installed PA systems

Amplifier

• Amplifier Type: Class D
• Power: 1600W
• System Protection: Processor-controlled monitoring with multi-band compression
• Input Limiting: Yes

Speaker

• Transducer: Custom high-efficiency 18" driver
• Frequency Response: 33 Hz to 200 Hz
• Maximum SPL: 133 dB

Voicing And Processing

• Voicing Presets: Flat, Deep, Punch
• Crossover: Variable crossover frequency
• Polarity: Polarity invert switch
• Front LED: Defeatable

Inputs And Outputs

• Inputs: Stereo XLR inputs
• Outputs: Stereo full-range XLR outputs
• High-Pass Outputs: Stereo high-pass XLR outputs
• Configuration: Stereo or mono-summing for single or dual subwoofer deployment
• Level Control: Variable level control (-6 dBU to +6 dBU)

Power

• Power Supply: Universal 100 V to 240 V AC
• Power Factor Correction: Yes

Construction

• Cabinet: Rugged wood construction
• Grille: Tough steel grille
• Pole Mount: Integrated M20 threaded pole cup

Physical

• Weight: 33.8 kg (74.5 lb)
• Dimensions (H x W x D): 592 x 584 x 686 mm (23.3 x 23.0 x 27.0 in)