15NPW

Name: 15NPW
Brand: REDCATT
SKU: 15NPWX8-016

Design Notes

The 15NPW is a high efficiency, (97 dB 1watt / 1 meter) 15-inch woofer with linear frequency response characteristics, high power handling capability while generating low harmonic distortion artifacts. The 15NPW uses a lightweight carbon fiber loaded cone assembly along with a high excursion triple roll constant geometry surround. This combination provides remarkable strength, high efficiency and a peak to peak maximum excursion of 15mm. Woofer features REDCATT double silicone sealed spider.

Power Handling
At the core of the 15NPW is it’s voice coil technology featuring a composite Polyimide former material capable of withstanding peak temperatures in excess of 350degC, well beyond the thermal requirements of modern professional audio systems.
The 15NPW cone and dust cap are made using an advanced carbon fiber loaded REDCATT pulp. The woofer 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 Neodymium

Basket Material Aluminum

Power Handling

AES Power 1200 W

Continuous Power 2400 W

Peak Power 4800 W

Voice Coil

Diameter 4 mm

Winding Wire Copper

Former Glass Fiber

Winding Height 25.5 mm

T/S Parameters

Resonant Frequency (Fs) 40.00 Hz

Re 5.60 \u2126

Qes 0.280

Qms 8.77

Qts 0.270

Vas 107.00 liters

Sd 881.00 cm\u00B2

Mms 155.10 grams

Rms 4.44

Cms 0.1000

Bl 28.30 T\u00B7m

Le 1.650 mH

Sensitivity 97.34 dB

Design Details

Spider Nomex

T-Plate 14 mm

Xmax (peak) 5.75 mm

Xmech 19.75 mm

Overall Diameter 392.00 mm

Bolt Circle Diameter 373.00 mm

Baffle Cutout Dia. 360.00 mm

Mounting Holes 8

Depth (flange to rear) 155.50 mm

Net Weight 8.50 kg

Ordering Codes

Product Code 15NPWX8-016

Downloads

2D Drawing (PDF) 3D Model (STEP)

Frequency Response & Impedance

2D Drawing

Technical Summary

The 15NPWX8-016 is a 15-inch professional woofer designed for the highest-demand touring PA, installed sound, and cinema applications requiring maximum acoustic output, thermal durability, and motor linearity from a single 15-inch driver. With a sensitivity of 97.34 dB (1 W/1 m) and an AES power handling of 1200 W at 8 ohms, the driver delivers a calculated maximum SPL of approximately 128 dB at 1 metre — among the highest figures available in the professional 15-inch woofer category. The motor system uses a 4-inch copper voice coil wound on a Polyimide former rated to withstand peak temperatures in excess of 350°C, providing sustained operation at continuous programme levels without thermal compression or former failure under the most demanding long-term drive conditions. The Neodymium magnet structure produces a Bl of 28.3 T·m at a Qts of 0.27, placing the 15NPW in the strong-motor professional woofer class where vented (bass reflex) enclosures are the only appropriate alignment. The carbon fiber loaded REDCATT paper cone assembly is treated against humidity and environmental exposure; the double silicone sealed Nomex spider provides moisture ingress protection for permanent installation and touring use.

The 15NPWX8-016 is optimized for vented enclosures across a 45 to 90 litre net internal volume range, with tuning frequencies from 47 to 65 Hz. The large cone area of 881 cm² combined with Xmax=5.75 mm produces a peak displacement Vd of 506.6 cm³, requiring a minimum port aperture of 125 mm round or 250×80 mm slot; a standard 100 mm round port produces velocities exceeding 22 m/s at all practical tuning frequencies and must not be used with this driver. The compact 45 L alignment, tuned to 65 Hz with a 125 mm round port of 192 mm length (16.9 m/s) or a 250×80 mm slot of 313 mm length (10.3 m/s), delivers -3 dB at approximately 63 Hz with maximum cone control and output across the midbass working range — suited to compact trapezoidal touring cabinets, column array woofer sections, and high-SPL stage monitors. The recommended 65 L balanced alignment at 55 Hz extends the -3 dB point to approximately 53 Hz, covering the complete music programme from bass guitar through upper midrange from a standard professional two-way enclosure format; slot port velocity of 8.8 m/s is within theatre and critical installation limits. The extended 90 L alignment at 47 Hz delivers -3 dB at approximately 45 Hz, resolving bass guitar open E at 41 Hz and low orchestral bass content in cinema LF, large-venue installation, and theatre main speaker applications. Port tube lengths remain nearly constant across all three alignments (184–192 mm round, 300–313 mm slot), a useful property for cabinet designs sharing common port hardware.

The 15NPWX8-016 requires professional high-power amplification of 1200–2400 W into 8 ohms, with DSP control mandatory for all alignments. A 24 dB/octave high-pass filter set at 50, 42, or 36 Hz depending on the alignment is required; the vented enclosure unloads the cone below Fb, and with Xprot=14.6 mm, displacement limiting must be active at full amplifier power to prevent progressive mechanical overload below the tuning frequency at high programme levels. The recommended operating bandwidth is approximately 40 Hz to 1.5 kHz, with a 24 dB/octave low-pass crossover to a compression driver or high-frequency section at 1.0–1.5 kHz appropriate for standard two-way system integration.

The 15NPWX8-016 is suited for: two-way touring PA enclosures requiring maximum SPL from a single 15-inch driver; flyable and fixed-install main speakers for theatres, stadia, arenas, houses of worship, and outdoor festivals; cinema main LF speaker assemblies where thermal durability and programme-consistent output across extended programme durations are required; high-SPL column array woofer sections; and reference two-way installed PA systems for venues where a single 15-inch cabinet must deliver full-bandwidth coverage at continuous programme levels without supplementary sub-bass reinforcement. Its combination of 97.34 dB sensitivity, 1200 W AES power handling, Neodymium motor with 350°C-rated Polyimide former, and carbon fiber loaded cone positions the 15NPW as the highest-output 15-inch driver in the REDCATT NPW platform for mid-to-large-scale professional audio applications.

Enclosure Recommendations

ENCLOSURE RECOMMENDATIONS: 15NPWX8-016
Driver: 15NPWX8-016 (15NPW) — 15" neodymium pro woofer, 8 ohm
Key T/S: Fs=40Hz, Qts=0.27, Qes=0.28, Qms=8.77, Vas=107L, Sens=97.34dB
Power: AES 1200W / Cont 2400W / Peak 4800W
Xmax=5.75mm (linear), Xmech=19.75mm, Xprot=14.6mm
Sd=881cm², Bl=28.3T·m, Le=1.65mH, Re=5.6Ω
Voice coil: 4-inch, copper winding, Polyimide former (350°C rated)
Cone: carbon fiber loaded REDCATT paper pulp, environmentally treated
Spider: Nomex, double silicone sealed
Surround: triple roll constant geometry
Depth: 155.5mm | Baffle cutout: 360mm | Neodymium motor | Aluminum basket

NPW PLATFORM CONTEXT:
  The 15NPW shares its fundamental motor architecture with the 12NPW
  (122NPWX8-102): 4-inch copper voice coil, Polyimide former rated to
  350°C, L-winding=25.5, double silicone sealed Nomex spider, and carbon
  fiber loaded paper cone. The 15-inch format increases Sd by 60% over
  the 12-inch (881 vs 551 cm²), raising displacement capacity and SPL
  ceiling, while the 1200W AES power rating — 50% above the 12NPW —
  places the 15NPW at the top tier of single-driver professional woofer
  power handling in this format.

ENCLOSURE TYPE RATIONALE:
  Qts=0.27 is within the low-motor-force professional woofer range,
  clearly favouring vented (bass reflex) enclosures. A sealed alignment
  would produce an overdamped, low-efficiency system with insufficient
  bass output relative to the driver's acoustic capability. Vented
  enclosures are the only recommended alignment for this driver.

  The large Sd=881cm² and Xmax=5.75mm produce a peak displacement
  Vd=506.6cm³ — the largest of any driver in this series at this excursion
  class. A 100mm round port produces velocities exceeding 22 m/s at all
  practical tuning frequencies and must not be used. Port sizing requires
  a minimum 125mm round tube or a slot port of at least 200cm² aperture
  area. The 250×80mm slot port is the preferred option for touring and
  installation cabinetry.

DISPLACEMENT:
  Vd = Sd × Xmax = 881 cm² × 0.575 cm = 506.6 cm³ (peak, one-way)

WEATHERIZATION:
  The carbon fiber loaded paper cone and dust cap are treated against
  humidity and environmental exposure. Metal basket components are
  aluminum with environmental coating. The double silicone sealed Nomex
  spider resists moisture ingress. Suitable for permanent indoor and
  semi-outdoor installations.
VENTED (BASS REFLEX) ALIGNMENTS
Ports: 125mm diameter round tube (Ap=1.227×10⁻² m²)
       OR 250×80mm slot port (Ap=2.000×10⁻² m²)

DO NOT use 100mm round port — velocity exceeds 22 m/s at all alignments.

Port velocity limit (pro PA / touring): ≤22 m/s
Port velocity limit (install / theatre): ≤17 m/s
ALIGNMENT A — COMPACT TOURING (45 L net internal)
  Box volume:        45 L (net internal)
  Tuning freq (Fb): 65 Hz
  125mm round port:  192mm long
    Port velocity:   16.9 m/s (peak, at Xmax)
  Slot port (250×80mm): 313mm long
    Port velocity:   10.3 m/s (peak, at Xmax)
  System f-3dB:      ~63 Hz
  HP filter:         50 Hz, 24 dB/oct DSP (mandatory)
  Max SPL (1200W, 1m): ~128 dB
  Application:       Compact two-way touring PA cabinet, 15" top box,
                     column array woofer, high-SPL stage monitor.
  Notes: Maximum output in the smallest enclosure. Fb=65Hz (1.63×Fs)
         places tuning firmly in the midbass band, delivering maximum
         cone control and output in the 65Hz–1.5kHz working range of a
         professional two-way woofer. At 45L, the enclosure is compatible
         with compact trapezoidal touring formats of approximately
         510×490×240mm external. The 125mm round port at 192mm length is
         practical in any panel position; the 250×80mm slot at 313mm is
         appropriate for rear-panel or baffle-integrated installation.
         The 50Hz HP filter is critical — below Fb, cone excursion rises
         rapidly and at 1200W, Xprot=14.6mm is approached quickly without
         DSP limiting.
ALIGNMENT B — STANDARD PA (65 L net internal)
  Box volume:        65 L (net internal)
  Tuning freq (Fb): 55 Hz
  125mm round port:  186mm long
    Port velocity:   14.3 m/s (peak, at Xmax)
  Slot port (250×80mm): 303mm long
    Port velocity:    8.8 m/s (peak, at Xmax)
  System f-3dB:      ~53 Hz
  HP filter:         42 Hz, 24 dB/oct DSP (mandatory)
  Max SPL (1200W, 1m): ~128 dB
  Application:       General-purpose two-way PA cabinet, installed main
                     speaker (theatre, stadium, HoW, arena), flyable
                     touring enclosure, large-format top box.
  Notes: The recommended all-purpose alignment. At 53Hz -3dB the system
         covers the complete music programme from bass guitar through
         upper vocals. The 65L enclosure is compatible with standard 15"
         professional two-way formats at approximately 560×530×290mm
         external. Both port options produce velocities well within PA
         and install limits. The 303mm slot port velocity of 8.8 m/s
         is appropriate for theatre and critical installation environments.
         With 97.34dB sensitivity and 1200W AES, peak acoustic output
         of ~128dB at 1m makes the 15NPW one of the highest-output
         single-driver two-way woofer solutions available in the 15-inch
         format.
ALIGNMENT C — EXTENDED LF (90 L net internal)
  Box volume:        90 L (net internal)
  Tuning freq (Fb): 47 Hz
  125mm round port:  184mm long
    Port velocity:   12.2 m/s (peak, at Xmax)
  Slot port (250×80mm): 300mm long
    Port velocity:    7.5 m/s (peak, at Xmax)
  System f-3dB:      ~45 Hz
  HP filter:         36 Hz, 24 dB/oct DSP (mandatory)
  Max SPL (1200W, 1m): ~128 dB
  Application:       Extended LF two-way cabinet, cinema main speaker
                     LF section, installed music system, large theatre
                     or arena main array woofer.
  Notes: The deepest available alignment. At 45Hz -3dB the system
         resolves bass guitar open E (41Hz), bass drum fundamentals, and
         the lower registers of keyboard and orchestral bass instruments.
         The 90L cabinet at approximately 610×580×330mm external is
         the practical upper limit for a flyable 15" two-way format;
         fixed-install enclosures can reach this volume more readily.
         Internal cross-bracing is recommended. Port tube lengths are
         nearly equal across all three alignments (184–192mm round,
         300–313mm slot) — a consequence of the larger Vb compensating
         for lower Fb — simplifying port specification across a product
         family sharing common port hardware.
SYSTEM SUMMARY TABLE
  | Alignment   | Volume | Fb    | f-3dB | 125mm Port | v      | Slot 250×80mm | v      | HP     |
  |-------------|--------|-------|-------|------------|--------|---------------|--------|--------|
  | A Compact   | 45 L   | 65 Hz | ~63Hz | 192mm      | 16.9   | 313mm         | 10.3   | 50 Hz  |
  | B Standard  | 65 L   | 55 Hz | ~53Hz | 186mm      | 14.3   | 303mm         | 8.8    | 42 Hz  |
  | C Extended  | 90 L   | 47 Hz | ~45Hz | 184mm      | 12.2   | 300mm         | 7.5    | 36 Hz  |
  All velocity figures in m/s (peak, at Xmax).

  Sensitivity:     97.34 dB (1W/1m)
  Max SPL (1200W): ~128 dB at 1m
  Impedance:       8 ohm nominal (Re=5.6Ω)
  Voice coil:      4-inch, copper, Polyimide former (350°C rated)
  WARNING:         Do not use 100mm round port — velocity exceeds limits.
                   Minimum port: 125mm round or 250×80mm slot.

Frequently Asked Questions

- Carbon fiber loaded paper cone
- Double silicone spider
- High power handling

ENCLOSURE RECOMMENDATIONS: 15NPWX8-016
Driver: 15NPWX8-016 (15NPW) — 15" neodymium pro woofer, 8 ohm
Key T/S: Fs=40Hz, Qts=0.27, Qes=0.28, Qms=8.77, Vas=107L, Sens=97.34dB
Power: AES 1200W / Cont 2400W / Peak 4800W
Xmax=5.75mm (linear), Xmech=19.75mm, Xprot=14.6mm
Sd=881cm², Bl=28.3T·m, Le=1.65mH, Re=5.6Ω
Voice coil: 4-inch, copper winding, Polyimide former (350°C rated)
Cone: carbon fiber loaded REDCATT paper pulp, environmentally treated
Spider: Nomex, double silicone sealed
Surround: triple roll constant geometry
Depth: 155.5mm | Baffle cutout: 360mm | Neodymium motor | Aluminum basket

NPW PLATFORM CONTEXT:
  The 15NPW shares its fundamental motor architecture with the 12NPW
  (122NPWX8-102): 4-inch copper voice coil, Polyimide former rated to
  350°C, L-winding=25.5, double silicone sealed Nomex spider, and carbon
  fiber loaded paper cone. The 15-inch format increases Sd by 60% over
  the 12-inch (881 vs 551 cm²), raising displacement capacity and SPL
  ceiling, while the 1200W AES power rating — 50% above the 12NPW —
  places the 15NPW at the top tier of single-driver professional woofer
  power handling in this format.

ENCLOSURE TYPE RATIONALE:
  Qts=0.27 is within the low-motor-force professional woofer range,
  clearly favouring vented (bass reflex) enclosures. A sealed alignment
  would produce an overdamped, low-efficiency system with insufficient
  bass output relative to the driver's acoustic capability. Vented
  enclosures are the only recommended alignment fo...

The 15NPWX8-016 is a 15-inch professional woofer designed for the highest-demand touring PA, installed sound, and cinema applications requiring maximum acoustic output, thermal durability, and motor linearity from a single 15-inch driver. With a sensitivity of 97.34 dB (1 W/1 m) and an AES power handling of 1200 W at 8 ohms, the driver delivers a calculated maximum SPL of approximately 128 dB at 1 metre — among the highest figures available in the professional 15-inch woofer category. The motor system uses a 4-inch copper voice coil wound on a Polyimide former rated to withstand peak temperatures in excess of 350°C, providing sustained operation at continuous programme levels without thermal compression or former failure under the most demanding long-term drive conditions. The Neodymium magnet structure produces a Bl of 28.3 T·m at a Qts of 0.27, placing the 15NPW in the strong-motor professional woofer class where vented (bass reflex) enclosures are the only appropriate alignment. The carbon fiber loaded REDCATT paper cone assembly is treated against humidity and environmental exposure; the double silicone sealed Nomex spider provides moisture ingress protection for permanent installation and touring use. The 15NPWX8-016 is optimized for vented enclosures across a 45 to 90 litre net internal volume range, with tuning frequencies from 47 to 65 Hz. The large cone area of 881 cm² combined with Xmax=5.75 mm produces a peak displacement Vd of 506.6 cm³, requiring a minimum port aperture of 125 mm round or 250×80 mm slot; a standard 100 mm round port produces velocities exceeding 22 m/s at all practical tuning frequencies and must not be used with this driver. The compact 45 L alignment, tuned to 65 Hz with a 125 mm round port of 192 mm length (16.9 m/s) or a 250×80 mm slot of 313 mm length (10.3 m/s), delivers -3 dB at approximately 63 Hz with maximum cone control and output across the midbass working range — suited to compact trapezoidal touring cabinets, column array woofer sections, and high-SPL stage monitors. The recommended 65 L balanced alignment at 55 Hz extends the -3 dB point to approximately 53 Hz, covering the complete music programme from bass guitar through upper midrange from a standard professional two-way enclosure format; slot port velocity of 8.8 m/s is within theatre and critical installation limits. The extended 90 L alignment at 47 Hz delivers -3 dB at approximately 45 Hz, resolving bass guitar open E at 41 Hz and low orchestral bass content in cinema LF, large-venue installation, and theatre main speaker applications. Port tube lengths remain nearly constant across all three alignments (184–192 mm round, 300–313 mm slot), a useful property for cabinet designs sharing common port hardware. The 15NPWX8-016 requires professional high-power amplification of 1200–2400 W into 8 ohms, with DSP control mandatory for all alignments. A 24 dB/octave high-pass filter set at 50, 42, or 36 Hz depending on the alignment is required; the vented enclosure unloads the cone below Fb, and with Xprot=14.6 mm, displacement limiting must be active at full amplifier power to prevent progressive mechanical overload below the tuning frequency at high programme levels. The recommended operating bandwidth is approximately 40 Hz to 1.5 kHz, with a 24 dB/octave low-pass crossover to a compression driver or high-frequency section at 1.0–1.5 kHz appropriate for standard two-way system integration. The 15NPWX8-016 is suited for: two-way touring PA enclosures requiring maximum SPL from a single 15-inch driver; flyable and fixed-install main speakers for theatres, stadia, arenas, houses of worship, and outdoor festivals; cinema main LF speaker assemblies where thermal durability and programme-consistent output across extended programme durations are required; high-SPL column array woofer sections; and reference two-way installed PA systems for venues where a single 15-inch cabinet must deliver full-bandwidth coverage at continuous programme levels without supplementary sub-bass reinforcement. Its combination of 97.34 dB sensitivity, 1200 W AES power handling, Neodymium motor with 350°C-rated Polyimide former, and carbon fiber loaded cone positions the 15NPW as the highest-output 15-inch driver in the REDCATT NPW platform for mid-to-large-scale professional audio applications.

AES Power: 1200 W, Continuous: 2400 W, Peak: 4800 W. Sensitivity: 97.34 dB (1W/1m).

Key Features

Quick Specs