LF
Woofer
15"
155FIND
Code: 155FINDX8-367D
Woofer/15inch/Ferrite/Paper/400W/8ohm
Key Features
- Cost effective design, yet with high spl, extended mid frequency
- Good power handling
- Lightweight paper cone, conex spider
Quick Specs
Impedance
8 Ω
Program Power
800 W
Sensitivity
94.55 dB
Fs
40.00 Hz
Magnet
Ferrite
Voice Coil
63.5 mm
Design Notes
The 154FIND is a cost-effective solution for two-way and multi-way systems, together with subwoofers. It’s lightweight yet strong cone allows the magnetic circuit to be size optimized while delivering a seizable amount of sound pressure. With its high efficiency (97 dB 1watt / 1 meter) and high power handling capabilities, this woofer will excel in all applications with tight budgets. The cone shape and material was developed to extend mid-frequency response, making the woofer good choice for two-way and multi-way systems.
Power Handling
At the core of the 154FIND is its voice coil technology featuring a composite Polyimide former material capable of withstanding peak temperatures above 280°C. The winding with high temperature handling copper wire ensures the long life of the voice coil, without the costly service cycles.
The cone is also extensively treated to withstand harsh environments and high humidity. Metal parts in the speaker assembly are coated for extreme weatherization protection.
Power Handling
At the core of the 154FIND is its voice coil technology featuring a composite Polyimide former material capable of withstanding peak temperatures above 280°C. The winding with high temperature handling copper wire ensures the long life of the voice coil, without the costly service cycles.
The cone is also extensively treated to withstand harsh environments and high humidity. Metal parts in the speaker assembly are coated for extreme weatherization protection.
Specifications
General Specs
Nominal Diameter
15"
Rated Impedance
8 Ohm
Magnet
Ferrite
Basket Material
Steel
Power Handling
AES Power
400 W
Continuous Power
800 W
Peak Power
1600 W
Voice Coil
Diameter
63.5 mm
Winding Wire
Copper
Former
Glass Fiber
Winding Height
15.5 mm
T/S Parameters
Resonant Frequency (Fs)
40.00 Hz
Re
6.20 \u2126
Qes
0.790
Qms
11.10
Qts
0.730
Vas
166.50 liters
Sd
881.00 cm\u00B2
Mms
102.60 grams
Rms
2.32
Cms
0.1500
Bl
14.38 T\u00B7m
Le
0.970 mH
Sensitivity
94.55 dB
Design Details
Surround Material
fabric
Cone/Dome Material
Paper GF
Spider
Nomex
T-Plate
6 mm
Xmax (peak)
4.75 mm
Xmech
10.75 mm
Overall Diameter
386.00 mm
Bolt Circle Diameter
373.00 mm
Baffle Cutout Dia.
352.00 mm
Mounting Holes
8
Depth (flange to rear)
142.00 mm
Net Weight
4.50 kg
Ordering Codes
Product Code
155FINDX8-367D
Downloads
Frequency Response & Impedance
2D Drawing
Technical Summary
The 155FINDX8-367D is a 15-inch woofer designed for professional PA, live sound, and installed sound systems with 94.6 dB sensitivity (1W/1m). The driver features a lightweight paper cone with fabric surround and Nomex spider, utilizing a ferrite magnet motor on a steel basket for cost-effective high-output performance. Weatherized construction with treated cone and coated metal parts supports operation in harsh environments.
In bass reflex enclosures, the driver performs best in net internal volumes of 55 to 90 liters, tuned between 36 and 48 Hz. The relatively high Qts (0.73) favors vented alignments with tuning near or above the free-air resonance frequency, providing strong mid-bass output with controlled cone excursion around the port tuning frequency. Lower tuning extends bass response but increases excursion below tuning, requiring appropriate high-pass filtering.
The driver is intended for use with high-power amplification (approx. 400 W AES / 800 W continuous) and DSP control. A high-pass filter in the range of 32–45 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. The extended cone geometry supports midrange response up to 2–2.5 kHz, making the driver suitable for two-way system configurations.
This design is particularly effective in single or multi-driver bass reflex systems used in PA, live sound, rental, and installed sound applications, where cost-effective performance, weatherized durability, and high output capability are required.
In bass reflex enclosures, the driver performs best in net internal volumes of 55 to 90 liters, tuned between 36 and 48 Hz. The relatively high Qts (0.73) favors vented alignments with tuning near or above the free-air resonance frequency, providing strong mid-bass output with controlled cone excursion around the port tuning frequency. Lower tuning extends bass response but increases excursion below tuning, requiring appropriate high-pass filtering.
The driver is intended for use with high-power amplification (approx. 400 W AES / 800 W continuous) and DSP control. A high-pass filter in the range of 32–45 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. The extended cone geometry supports midrange response up to 2–2.5 kHz, making the driver suitable for two-way system configurations.
This design is particularly effective in single or multi-driver bass reflex systems used in PA, live sound, rental, and installed sound applications, where cost-effective performance, weatherized durability, and high output capability are required.
Enclosure Recommendations
ENCLOSURE RECOMMENDATIONS: 155FINDX8-367D
Driver: 155FINDX8-367D (155FIND) — 15" woofer
Key T/S: Fs=40.0Hz, Qts=0.73, Vas=166.5L, Sens=94.55dB
Power: AES 400W / Cont 800W / Peak 1600W
Xmax=4.75mm, Xmech=10.75mm, Sd=881.0cm², Bl=14.38T·m
RECOMMENDED ENCLOSURE TYPE: Bass Reflex (Vented)
PORT RECOMMENDATION: Round port (125mm diameter) — recommended for 15" drivers to maintain low port velocity at high excursion
NOTES ON Qts:
The relatively high Qts (0.73) indicates a softer motor control characteristic
typical of cost-optimized ferrite designs. This driver is best suited for vented
enclosures where the port resonance provides additional cone control near tuning
frequency. Sealed enclosures are not recommended as even large volumes (>150L)
would result in Qtc values well above 1.0, producing boomy, under-damped response.
a) High SPL (Compact)
Net Volume: 55 liters
Tuning (Fb): 48 Hz
Est. -3dB: 50 Hz
HP Filter: 45 Hz (24dB/oct recommended)
Round Port: 125mm dia × 289mm long
Slot Port: 200mm W × 60mm H × 282mm L
Port Velocity: 10.3 m/s
Notes: Maximum mid-bass punch, compact cabinet, suited for stage monitors
and horn-loaded sub designs; reduced low-frequency extension
b) Balanced Response
Net Volume: 70 liters
Tuning (Fb): 42 Hz
Est. -3dB: 42 Hz
HP Filter: 38 Hz (24dB/oct recommended)
Round Port: 125mm dia × 296mm long
Slot Port: 200mm W × 60mm H × 290mm L
Port Velocity: 9.0 m/s
Notes: General-purpose PA/live sound, good balance between output and
extension; recommended starting point for most applications
c) Extended Low Frequency
Net Volume: 90 liters
Tuning (Fb): 36 Hz
Est. -3dB: 35 Hz
HP Filter: 32 Hz (24dB/oct recommended)
Round Port: 125mm dia × 313mm long
Slot Port: 200mm W × 60mm H × 307mm L
Port Velocity: 7.7 m/s
Notes: Deep bass extension for sub-bass reinforcement, larger cabinet;
requires proper high-pass protection below tuning to prevent
excessive excursion
APPLICATION NOTES:
- The lightweight paper cone and extended cone geometry provide useful midrange
response, making this woofer suitable for two-way systems with crossover
points up to 2–2.5 kHz
- Weatherized construction (treated cone, coated metal parts) supports outdoor
and harsh-environment installations
- The ferrite magnet and cost-effective design make this driver ideal for
budget-conscious multi-box PA systems, rental fleets, and installed sound
- Glass fiber voice coil former with Polyimide construction handles sustained
high-power operation with reduced risk of thermal failure
- For horn-loaded applications, the compact (55L) alignment provides the
highest efficiency and mid-bass impact
Frequently Asked Questions
- - Cost effective design, yet with high spl, extended mid frequency
- - Good power handling
- - Lightweight paper cone, conex spider
ENCLOSURE RECOMMENDATIONS: 155FINDX8-367D
Driver: 155FINDX8-367D (155FIND) — 15" woofer
Key T/S: Fs=40.0Hz, Qts=0.73, Vas=166.5L, Sens=94.55dB
Power: AES 400W / Cont 800W / Peak 1600W
Xmax=4.75mm, Xmech=10.75mm, Sd=881.0cm², Bl=14.38T·m
RECOMMENDED ENCLOSURE TYPE: Bass Reflex (Vented)
PORT RECOMMENDATION: Round port (125mm diameter) — recommended for 15" drivers to maintain low port velocity at high excursion
NOTES ON Qts:
The relatively high Qts (0.73) indicates a softer motor control characteristic
typical of cost-optimized ferrite designs. This driver is best suited for vented
enclosures where the port resonance provides additional cone control near tuning
frequency. Sealed enclosures are not recommended as even large volumes (>150L)
would result in Qtc values well above 1.0, producing boomy, under-damped response.
a) High SPL (Compact)
Net Volume: 55 liters
Tuning (Fb): 48 Hz
Est. -3dB: 50 Hz
HP Filter: 45 Hz (24dB/oct recommended)
Round Port: 125mm dia × 289mm long
Slot Port: 200mm W × 60mm H × 282mm L
Port Velocity: 10.3 m/s
Notes: Maximum mid-bass punch, compact cabinet, suited for stage monitors
and horn-loaded sub designs; reduced low-frequency extension
b) Balanced Response
Net Volume: 70 liters
Tuning (Fb): 42 Hz
Est. -3dB: 42 Hz
HP Filter: 38 Hz (24dB/oct recommended)
Round Port: 125mm dia × 296mm long
Slot Port: 200mm W × 60mm H × 290mm L
Port Velocity: 9.0 m/s
Notes:...
The 155FINDX8-367D is a 15-inch woofer designed for professional PA, live sound, and installed sound systems with 94.6 dB sensitivity (1W/1m). The driver features a lightweight paper cone with fabric surround and Nomex spider, utilizing a ferrite magnet motor on a steel basket for cost-effective high-output performance. Weatherized construction with treated cone and coated metal parts supports operation in harsh environments.
In bass reflex enclosures, the driver performs best in net internal volumes of 55 to 90 liters, tuned between 36 and 48 Hz. The relatively high Qts (0.73) favors vented alignments with tuning near or above the free-air resonance frequency, providing strong mid-bass output with controlled cone excursion around the port tuning frequency. Lower tuning extends bass response but increases excursion below tuning, requiring appropriate high-pass filtering.
The driver is intended for use with high-power amplification (approx. 400 W AES / 800 W continuous) and DSP control. A high-pass filter in the range of 32–45 Hz is recommended depending on enclosure tuning, along with proper limiting to manage thermal and mechanical stress. The extended cone geometry supports midrange response up to 2–2.5 kHz, making the driver suitable for two-way system configurations.
This design is particularly effective in single or multi-driver bass reflex systems used in PA, live sound, rental, and installed sound applications, where cost-effective performance, weatherized durability, and high output capability are required.
AES Power: 400 W,
Continuous: 800 W,
Peak: 1600 W.
Sensitivity: 94.55 dB (1W/1m).
