18″ High-Power Woofer for PA and Low-Frequency Systems

Product Overview
The 186FIND is a high-performance 18″ woofer designed for demanding PA, subwoofer, and low-frequency sound reinforcement applications. It features a large 4.5″ high-temperature voice coil capable of withstanding elevated thermal loads, a robust ferrite motor structure, and an optimized cone-and-surround assembly for extended excursion and durable performance.

This driver is built to deliver high power handling, strong low-frequency output, and long-term reliability in both portable and installed systems.

Typical Applications
● Subwoofer and LF sections in PA systems
● High-output bookshelf and floor-standing designs
● Low-frequency reinforcement in portable loudspeakers
● OEM and custom PA designs

Key Features
● High power handling: robust AES and program ratings
● Large 4.5″ voice coil for thermal resilience
● High excursion capability for increased bass output
● Durable cone and spider design for long life
● Strong ferrite motor system for efficient energy transfer

SECTION 2 — TECHNICAL REFERENCE & SYSTEM INTEGRATION DATA

Section Title
Technical Reference & System Integration Data

Subtitle (optional)
For system designers, engineers, DIY users, and AI-based technical search

Driver Classification
Driver type: High-power 18″ woofer
Intended system topology: Low-frequency reinforcement in PA / subwoofer enclosures
Design focus: High output, strong excursion, thermal durability

Electro-Acoustic Parameters (Driver-Intrinsic)
● Nominal diameter: 18 in
● Rated impedance: 8 Ω
● AES power handling: 1,800 W
● Program power: 3,600 W
● Voice coil diameter: 4.5 in
● Voice coil material: Copper
● Voice coil former: Kapton
● Voice coil winding height: 31.8 mm
● Surround material: Fabric
● Cone material: Paper pulp with glass fibers
● Spider type: Conex
● Plate thickness: 15 mm
● Peak-to-peak linear cone displacement: 19 mm

Thiele-Small Parameters
● Resonant frequency (fs): 33 Hz
● Re (DC resistance): 5.5 Ω
● Qes: 0.36
● Qms: 12.1
● Qts: 0.35
● Vas: 174.2 liters
● Sd (effective piston area): 1,256 cm²
● Mms (moving mass): 288 grams
● Bl (force factor): 30.2 T·m
● Le (voice coil inductance): 1.51 mH
● Sensitivity (1 W / 1 m): 96 dB
These T/S parameters are useful for enclosure design and simulation in speaker design software.

Mechanical Dimensions
● Overall diameter: 468 mm
● Bolt circle diameter: 442 mm
● Baffle cutout diameter: 423 mm
● Number of mounting holes: 8
● Mounting depth (flange to rear): 212 mm
● Net weight: 19.3 kg

Recommended System Integration
 Suitable enclosure types:
● Ported subwoofers (tuned low for deep bass)
● Bandpass LF boxes (for controlled LF output)
● High-output sealed designs (where low distortion is prioritized)

Recommended low-frequency target:
● Extend reliably into the 30–100 Hz range (system dependent)
 Use Thiele-Small parameters in modeling tools (WinISD, BassBox, Hornresp, etc.) to tune enclosure volumes and tuning frequencies according to your design goals.

Design Intent
The 186FIND is engineered for demanding low-frequency applications where high power handling, long excursion, and thermal resilience are essential. The robust motor and suspension system support extended performance without compromising reliability, making this driver suitable for subwoofer and LF applications in professional PA systems and high-output custom designs.

Application Guidance
Recommended for:
● Professional PA subwoofer and LF reinforcement
● High-output portable loudspeaker systems
● Custom OEM and high-power bass applications
● Systems where strong low-end impact and durability are required

Not intended for:
● Midrange or high-frequency applications
● Small full-range cabinets without proper LF extension

The following enclosure recommendations are provided as general design
 guidance based on the driver’s Thiele–Small parameters. Final enclosure
 volume, tuning, and port design should be validated through simulation
 and measurement according to the specific application.

Recommended enclosure type:
● Vented (bass-reflex)

Typical net internal volume (Vb):
● 140–160 L — compact PA subwoofer, punch-focused response
● 170–200 L — balanced PA subwoofer (recommended starting range)
● 220–260 L — extended low-frequency response (requires LF protection)

Typical tuning frequency (Fb):
● 36–40 Hz — compact, high-impact PA systems
● 33–36 Hz — balanced all-round PA use
● 30–33 Hz — extended LF designs

For high-power operation, the use of a high-pass filter is recommended,
particularly for enclosures tuned below 35 Hz, to control cone excursion
below the tuning frequency.

IMPLEMENTATION NOTES FOR DESIGNER
● Keep everything on ONE URL / ONE PAGE
● Marketing section at the top, technical section below
● Do NOT hide the technical section (no blocked content)
● Use real text (not only images or PDFs) for all data
● Section headings must be clear and descriptive
● Include numeric specs and Thiele-Small parameters because this is a cone woofer and these values are meaningful for enclosure design