10NPM

ENCLOSURE RECOMMENDATIONS: 10NPMX8-055
Driver: 10NPMX8-055 (10NPM) — 10" Mid-Woofer / Midrange
Key T/S: Fs=64Hz, Qts=0.28, Vas=23L, Sens=97.5dB 1W/1m
Power: AES 400W / Cont 800W / Peak 1600W
Xmax=4.05mm (one-way linear), Xmech=14.55mm (protection at 17.2mm p-p)
Sd=363cm², Bl=18.3T·m, Re=4.7Ω, Mms=50.7g
Voice Coil: 3" CCAW on glass fiber former (18.6mm winding height)
Magnet: Neodymium (inside slug, flux-modulation optimized)
Cone: Carbon fiber loaded paper | Surround: Fabric (double roll,
constant geometry) | Spider: Nomex | Basket: Aluminum
NOTE: This driver's very low Qts (0.28), extremely high sensitivity
(97.5 dB), and powerful neodymium motor (Bl=18.3 T·m) make it
suitable for BOTH vented mid-woofer and sealed midrange applications.
The 400 W AES power handling — double that of the 8" NPM variants —
positions this driver for high-output professional systems. The inside
neodymium slug motor design is optimized for minimum flux modulation,
providing exceptional linearity and very low harmonic distortion. The
carbon fiber loaded paper cone with precision double roll constant
geometry surround delivers 7.5 mm of excursion linearity (peak-to-
peak). Six enclosure alignments are provided below — three vented
(mid-woofer use) and three sealed (midrange use).
  MID-WOOFER APPLICATION — Bass Reflex (Vented)
Use case: 2-way and multi-way systems, large-format line arrays, and
high-output PA systems where the 10NPM handles the low-frequency and
lower-midrange content, typically crossed over to a compression driver
at 1.2–2.5 kHz. The extreme sensitivity (97.5 dB) and high power
handling (400W AES) make this driver capable of very high continuous
SPL from each cabinet.
PORT RECOMMENDATION: Round port (76mm diameter) — standard for 10"
bass reflex enclosures. Port velocities are moderate (10–13 m/s) and
port lengths are short (79–119 mm), making port design straightforward.
Flared port ends are recommended for best practice but not critical
at these velocities.
  a) VENTED — High SPL
     Net Volume: 23 liters
     Tuning (Fb): 66 Hz
     Est. -3dB: 61 Hz
     HP Filter: 56 Hz (24dB/oct LR recommended)
     Round Port: 76mm dia × 79mm long
     Slot Port: 184mm W × 45mm H × 111mm L
     Port Velocity: 13.4 m/s
     Notes: Compact alignment with strong mid-bass control and
     maximum output per cabinet volume. Higher tuning provides
     tight, punchy low end with excellent transient response.
     Ideal for large-format 2-way tops, high-output stage
     monitors, and touring cabinets paired with subwoofers.
     The 97.5 dB sensitivity combined with 400W AES delivers
     exceptional continuous SPL from a compact enclosure.
  b) VENTED — Balanced Response
     Net Volume: 27 liters
     Tuning (Fb): 58 Hz
     Est. -3dB: 49 Hz
     HP Filter: 48 Hz (24dB/oct LR recommended)
     Round Port: 76mm dia × 93mm long
     Slot Port: 184mm W × 45mm H × 130mm L
     Port Velocity: 11.8 m/s
     Notes: General-purpose alignment with even response through
     the bass region and good transient behavior. Well-suited
     for most PA tops, multi-way systems, and installation
     loudspeakers. Provides good stand-alone bass capability
     when subwoofer support is unavailable.
  c) VENTED — Extended Low Frequency
     Net Volume: 31 liters
     Tuning (Fb): 50 Hz
     Est. -3dB: 42 Hz
     HP Filter: 40 Hz (24dB/oct LR recommended)
     Round Port: 76mm dia × 119mm long
     Slot Port: 184mm W × 45mm H × 167mm L
     Port Velocity: 10.2 m/s
     Notes: Maximum low-frequency extension for stand-alone use
     without subwoofers. Reaches into the low 40s Hz while
     maintaining the strong motor control characteristic of the
     low Qts design. Best for applications where full-range bass
     coverage from a single 10" cabinet is required (corporate
     events, larger live venues, portable entertainment systems).
     Requires proper high-pass protection below tuning.
  MIDRANGE APPLICATION — Sealed
Use case: Large-format line array midrange sections, horn-loaded
midrange systems, coaxial cabinets, and dedicated mid-high enclosures
where the 10NPM handles the midrange band (typically 200–2500 Hz or
narrower), with bass duties handled by separate woofer/subwoofer
sections. The larger Sd (363 cm²) compared to 8" midranges provides
higher midrange output per driver — a key advantage in large-format
line arrays and high-SPL point-source designs.
  d) SEALED — High SPL (Qtc ≈ 1.0)
     Net Volume: 2.0 liters
     System Resonance (fc): 229 Hz
     Qtc: 1.0
     Response: Broad gentle lift near fc, maximum midrange output
     Crossover HP: 220–300 Hz (24dB/oct LR recommended)
     Notes: Compact sealed chamber for maximum acoustic output
     in the midrange passband. The elevated Qtc provides a gentle
     broad peak near system resonance that can be equalized flat
     via DSP or used as a passband sensitivity boost. Ideal for
     high-output touring line arrays and horn-loaded midrange
     systems where output per driver is the primary requirement.
     The 97.5 dB sensitivity in a 2-liter sealed chamber makes
     this a formidable midrange source.
  e) SEALED — Balanced (Qtc ≈ 0.85)
     Net Volume: 2.8 liters
     System Resonance (fc): 194 Hz
     Qtc: 0.85
     Response: Slightly warm, smooth transition through resonance
     Crossover HP: 180–250 Hz (24dB/oct LR recommended)
     Notes: Good compromise between midrange output and response
     flatness. Suitable for most professional midrange applications
     including line arrays, point-source cabinets, and large-format
     stage monitors. The slight warmth near resonance is easily
     managed with DSP.
  f) SEALED — Butterworth (Qtc ≈ 0.707)
     Net Volume: 4.3 liters
     System Resonance (fc): 162 Hz
     Qtc: 0.707
     Response: Maximally flat amplitude, textbook Butterworth alignment
     Crossover HP: 150–200 Hz (24dB/oct LR recommended)
     Notes: Flattest possible sealed response with lowest system
     resonance. Allows a lower crossover frequency and extended
     lower-midrange coverage. Best for applications prioritizing
     accuracy, smooth crossover integration, and minimal DSP
     correction. The larger volume (4.3L) is still very compact
     for a 10" driver.
THERMAL NOTE: The 3" CCAW voice coil on glass fiber former, combined
with the inside neodymium slug motor and aluminum basket, provides an
efficient thermal path. The 400W AES rating represents genuine
sustained power handling capability — double the 8" NPM variants —
making this driver suitable for the most demanding continuous-duty
applications in touring and installation.
DESIGN NOTE: The flux-modulation-optimized inside neodymium slug
motor with aluminum shorting features minimizes harmonic and
intermodulation distortion across the full operating range. The carbon
fiber loaded paper cone with precision double roll constant geometry
surround provides 7.5 mm peak-to-peak excursion linearity with a
lightweight, stiff piston characteristic. The Nomex spider ensures
consistent restoring force throughout the excursion range.
COMPARISON vs 8" NPM VARIANTS:
  Parameter        8NPM (157)   81NPM (373A)  10NPM (055)
  Size             8"           8"            10"
  Qts              0.29         0.28          0.28
  Sensitivity      96 dB        93 dB         97.5 dB
  AES Power        200W         200W          400W
  Bl               14.2 T·m     19.3 T·m      18.3 T·m
  Xmax             3.7mm        4.05mm        4.05mm
  Sd               213.8 cm²    219 cm²       363 cm²
  Vented volumes   10–14L       10–14L        23–31L
  Sealed volumes   1.0–2.2L     0.9–1.9L      2.0–4.3L
The 10NPM scales the NPM platform to 10" with proportionally
larger enclosure volumes, +1.5 dB sensitivity gain, and double
the power handling — making it the natural choice for larger-format
systems and line arrays requiring higher per-driver output.