- Cone excursion 56mm !!Patented design.
- 1 demodulation copper ring, powerful and innovative motor structure, innovative venting system
- Double spider with spacer, woven-in tinsel wires, reinforced cone edge.
- Designed based upon the 18XR, the 181XR was designed for professional
audio segment. The basic characters and design concept remains the same for the 181XR. We have
used newly designed 4 roll waterproof fabric surround that fully supports the high cone excursions of this incredible loud-speaker.
The target was to push the envelope of possibilities. We - are giving you a product that will not limit you to achieve even your wildest sub-woofer dreams.
Motor Design
The magnetic design incorporates large neodymium magnets placed along the voice coil winding. This has allowed us to push the cone excursion to 44mm peak to peak. Unique gap venting ensures good air circu-lation - and greatly improves the reliability of this driver. We have also developed a new technique for manufacturing deep copper caps.
The design further utilizes dual, uncom-monly large, spiders, spaced with spacer, hot-pressed tinsel wires onto the top spider, reinforced cone edge, reinforced surround to cone joint, reinforced spider to basket joints, etc.
General specs Nominal Diameter: 18 in. Rated Impedance: 4 Ohm Power handling AES Power: 1,200 Watts Program Power: 2,400 Watts Peak Power: 4,800 Watts Voice Coil Diameter: 4 in. Winding wire: Copper Former: Glass Fiber Winding height: 22 mm T/S Parameters Resonant frequency: 30 Hz Re: 3.3 ohm Qes: 0.24 Qms: 13.2 Qts: 0.23 Vas: 195 liters Sd: 1256.6 cm2 Sensitivity: 97 dB Mms: 306 grams Bl: 28.3 Le: 1.3 mH Design details Surround Material: Fabric Cone material: Paper Spider: Nomex Plate thickness: 56 mm Peak to peak linear cone Displacement 44.4 mm Overall diameter: 467.6 mm Bolt circle diameter: 442 mm Baffle cutout dia.: 442 mm Number of mounting holes: 8 Depth (flange to rear): 257.2 mm Net weight: 14.5 kg Ordering codes: 181XR-X4 ohm-350 Recone kits: RC181XRX-350 In many cases REDCATT produces 4 ohms, 8 ohms and 16 ohms versions. Indicate what impedance do you need in your request. Download: Spec download 2D drawing 3D model
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PRODUCT CODE: 181XRX4-350
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--- ENCLOSURE RECOMMENDATIONS ---
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ENCLOSURE RECOMMENDATIONS: 181XRX4-350
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Driver: 181XRX4-350 (181XR) — 18" Sub-woofer
Key T/S: Fs=30.0Hz, Qts=0.23, Vas=195.0L, Sens=96.54dB
Power: AES 1200W / Cont 2400W / Peak 4800W
Xmax=17.00mm, Sd=1256.6cm², Bl=28.3T·m
RECOMMENDED ENCLOSURE TYPE: Bass Reflex (Vented)
PORT RECOMMENDATION: Slot port (full-width or L-shaped internal duct) — provides large cross-sectional area needed for high air displacement; reduces port noise at high SPL
a) High SPL
Net Volume: 230 liters
Tuning (Fb): 28 Hz
Est. -3dB: 24 Hz
HP Filter: 25 Hz (24dB/oct recommended)
Round Ports: 2× 125mm dia × 301mm long
Slot Port: 338mm W × 75mm H × 273mm L
Port Velocity: 15.5 m/s
Notes: Strong mid-bass impact, reduced cone excursion, maximum output
b) Balanced Response
Net Volume: 275 liters
Tuning (Fb): 25 Hz
Est. -3dB: 21 Hz
HP Filter: 22 Hz (24dB/oct recommended)
Round Ports: 2× 125mm dia × 343mm long
Slot Port: 338mm W × 75mm H × 317mm L
Port Velocity: 13.6 m/s
Notes: General-purpose PA/subwoofer, even response, good transient behavior
c) Extended Low Frequency
Net Volume: 275 liters
Tuning (Fb): 23 Hz
Est. -3dB: 20 Hz
HP Filter: 20 Hz (24dB/oct recommended)
Round Ports: 2× 125mm dia × 402mm long
Slot Port: 338mm W × 75mm H × 378mm L
Port Velocity: 12.7 m/s
Notes: Deep bass extension, requires proper system protection below tuning
--- Summary ---
The 181XRX4-350 is a 18-inch high-output sub-woofer driver designed for professional subwoofer systems requiring high sensitivity (97 dB 1W/1m) and controlled low-frequency behavior. The motor and suspension are optimized to maintain consistent performance at high drive levels, with controlled excursion and reduced thermal compression during long-term operation.
In bass reflex enclosures, the driver performs best in net internal volumes of 230 to 275 liters, tuned between 23 and 28 Hz. This alignment provides a balanced combination of low-frequency extension, cone control around resonance, and efficient port loading. Lower tuning improves deep bass extension but increases excursion below tuning, requiring appropriate high-pass filtering. Higher tuning increases sensitivity and output in the upper bass region while improving mechanical control.
The driver is intended for use with high-power amplification (approx. 1200 W AES / 2400 W continuous) and DSP control. A high-pass filter in the range of 20–25 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 20–100 Hz, making it suitable for integration with mid-bass or full-range systems.
This design is particularly effective in single or multi-driver bass reflex systems used in touring, installation, and high-SPL applications, where consistent performance, durability, and output capability are critical.
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PRODUCT CODE: 181XRX8-350B
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--- ENCLOSURE RECOMMENDATIONS ---
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ENCLOSURE RECOMMENDATIONS: 181XRX4-350
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Driver: 181XRX8-350B (181XR) — 18" Sub-woofer
Key T/S: Fs=30.0Hz, Qts=0.23, Vas=195.0L, Sens=96.54dB
Power: AES 1200W / Cont 2400W / Peak 4800W
Xmax=17.00mm, Sd=1256.6cm², Bl=28.3T·m
RECOMMENDED ENCLOSURE TYPE: Bass Reflex (Vented)
PORT RECOMMENDATION: Slot port (full-width or L-shaped internal duct) — provides large cross-sectional area needed for high air displacement; reduces port noise at high SPL
a) High SPL
Net Volume: 230 liters
Tuning (Fb): 28 Hz
Est. -3dB: 24 Hz
HP Filter: 25 Hz (24dB/oct recommended)
Round Ports: 2× 125mm dia × 301mm long
Slot Port: 338mm W × 75mm H × 273mm L
Port Velocity: 15.5 m/s
Notes: Strong mid-bass impact, reduced cone excursion, maximum output
b) Balanced Response
Net Volume: 275 liters
Tuning (Fb): 25 Hz
Est. -3dB: 21 Hz
HP Filter: 22 Hz (24dB/oct recommended)
Round Ports: 2× 125mm dia × 343mm long
Slot Port: 338mm W × 75mm H × 317mm L
Port Velocity: 13.6 m/s
Notes: General-purpose PA/subwoofer, even response, good transient behavior
c) Extended Low Frequency
Net Volume: 275 liters
Tuning (Fb): 23 Hz
Est. -3dB: 20 Hz
HP Filter: 20 Hz (24dB/oct recommended)
Round Ports: 2× 125mm dia × 402mm long
Slot Port: 338mm W × 75mm H × 378mm L
Port Velocity: 12.7 m/s
Notes: Deep bass extension, requires proper system protection below tuning
--- Summary ---
The 181XRX4-350 is a 18-inch high-output sub-woofer driver designed for professional subwoofer systems requiring high sensitivity (97 dB 1W/1m) and controlled low-frequency behavior. The motor and suspension are optimized to maintain consistent performance at high drive levels, with controlled excursion and reduced thermal compression during long-term operation.
In bass reflex enclosures, the driver performs best in net internal volumes of 230 to 275 liters, tuned between 23 and 28 Hz. This alignment provides a balanced combination of low-frequency extension, cone control around resonance, and efficient port loading. Lower tuning improves deep bass extension but increases excursion below tuning, requiring appropriate high-pass filtering. Higher tuning increases sensitivity and output in the upper bass region while improving mechanical control.
The driver is intended for use with high-power amplification (approx. 1200 W AES / 2400 W continuous) and DSP control. A high-pass filter in the range of 20–25 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. Typical operating bandwidth is 20–100 Hz, making it suitable for integration with mid-bass or full-range systems.
This design is particularly effective in single or multi-driver bass reflex systems used in touring, installation, and high-SPL applications, where consistent performance, durability, and output capability are critical.
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