101NPM

ENCLOSURE RECOMMENDATIONS: 101NPMX8-119
Driver: 101NPMX8-119 (101NPM) — 10" Mid-Woofer
Key T/S: Fs=53Hz, Qts=0.55, Vas=49.7L, Sens=95dB 1W/1m
Power: AES 150W / Cont 300W / Peak 600W
Xmax=3.25mm (one-way linear), Xmech=11.25mm (protection at 13.6mm p-p)
Sd=363cm², Bl=9.6T·m, Re=5Ω, Mms=32.6g (exceptionally light for 10")
Voice Coil: 2" CCAR (copper clad aluminum round wire) on glass fiber former
(14.5mm winding height)
Magnet: Neodymium (inside slug) with 2 aluminum shorting rings
Cone: Carbon fiber loaded paper pulp | Surround: Fabric (triple roll)
Spider: Nomex | Basket: Aluminum
NOTE: This driver is engineered specifically for lightweight, portable
professional loudspeaker products. The combination of an inside
neodymium slug motor, carbon fiber loaded paper cone, and exceptionally
low moving mass (32.6g for a 10" — roughly half the mass of a typical
professional 10" woofer) produces a very high sensitivity (95 dB)
mid-woofer that gets loud with minimal amplifier power. The 2 aluminum
shorting rings in the neodymium motor minimize flux modulation for very
low harmonic distortion. The triple roll fabric surround provides
controlled long-excursion behavior (13.6 mm peak-to-peak mechanical)
while maintaining the lightweight design ethos. Vented enclosures in
the 23–32 liter range are the optimal configuration.
  PRIMARY — Bass Reflex (Vented)
Use case: Portable 2-way and multi-way PA tops, stage monitors,
lightweight installation systems, and column speakers where the
101NPM handles the low-frequency and lower-midrange content,
typically crossed over to a compression driver or tweeter at
1.5–3 kHz. The lightweight motor and cone assembly make this
driver ideal for systems where total cabinet weight is a critical
design parameter.
PORT RECOMMENDATION: Round port (76mm diameter) — standard for 10"
bass reflex enclosures. Port velocities are very low across all
alignments (8–10 m/s) and port lengths are short (~100 mm), making
port design completely uncritical. A simple straight 76mm tube is
more than adequate. No flaring required.
  a) VENTED — High SPL
     Net Volume: 23 liters
     Tuning (Fb): 61 Hz
     Est. -3dB: 56 Hz
     HP Filter: 51 Hz (24dB/oct LR recommended)
     Round Port: 76mm dia × 102mm long
     Slot Port: 184mm W × 45mm H × 143mm L
     Port Velocity: 10.0 m/s
     Notes: Most compact vented alignment, optimized for maximum
     output per unit volume and minimum cabinet weight. Higher
     tuning provides punchy, controlled mid-bass with excellent
     transient response. Ideal for lightweight portable 2-way
     tops and stage monitors paired with subwoofers, where the
     95 dB sensitivity maximizes system headroom. A 23-liter
     cabinet with this driver and a neodymium compression driver
     produces an exceptionally lightweight, high-output system.
  b) VENTED — Balanced Response
     Net Volume: 27 liters
     Tuning (Fb): 56 Hz
     Est. -3dB: 52 Hz
     HP Filter: 46 Hz (24dB/oct LR recommended)
     Round Port: 76mm dia × 104mm long
     Slot Port: 184mm W × 45mm H × 146mm L
     Port Velocity: 9.2 m/s
     Notes: General-purpose alignment with even response through
     the bass region. Good balance between low-frequency extension,
     cabinet size, and weight. Well-suited for most portable PA
     tops, multi-way systems, and lightweight installation
     loudspeakers. Provides moderate stand-alone bass capability
     when subwoofer support is intermittent.
  c) VENTED — Extended Low Frequency
     Net Volume: 32 liters
     Tuning (Fb): 50 Hz
     Est. -3dB: 42 Hz
     HP Filter: 40 Hz (24dB/oct LR recommended)
     Round Port: 76mm dia × 113mm long
     Slot Port: 184mm W × 45mm H × 158mm L
     Port Velocity: 8.2 m/s
     Notes: Maximum low-frequency extension for stand-alone use
     without subwoofers. Reaches into the low 40s Hz, providing
     substantial bass from a lightweight 10" system. The larger
     cabinet is still very manageable for portable applications
     given the lightweight neodymium motor. Best for applications
     where full-range bass coverage is needed from a single
     cabinet (e.g., portable entertainment, corporate events,
     smaller live venues).
WEIGHT ADVANTAGE: A typical professional 10" mid-woofer with ferrite
motor weighs 3–5 kg. This driver's inside neodymium slug motor,
carbon fiber loaded cone, and aluminum basket keep the total driver
weight to a minimum. Combined with lightweight enclosure materials
(plywood or composite), the complete system weight is significantly
below comparable ferrite-based designs.
  ALTERNATIVE — Sealed Enclosures (Compact Portable)
Sealed enclosures are viable where the driver is used as a mid-bass
in a multi-way system with a dedicated subwoofer handling the deep
bass. The higher Qts (0.55) means sealed Butterworth requires a very
large box (76L), so practical sealed volumes produce elevated Qtc
values. This is acceptable when the driver operates above 80–100 Hz
with active crossover filtering.
  d) SEALED — Ultra-Compact (Qtc ≈ 1.0)
     Net Volume: 22 liters
     System Resonance (fc): 96 Hz
     Qtc: 1.0
     HP Crossover: 100–150 Hz (24dB/oct LR recommended)
     Notes: Very compact sealed alignment for mid-bass use in
     multi-way systems. The fc of 96 Hz means this configuration
     is NOT suitable for stand-alone bass reproduction — it
     requires a dedicated subwoofer. However, for a crossed-over
     mid-bass driver in a 3-way or 4-way system, the compact
     cabinet and high sensitivity make this an efficient choice.
     The broad resonance peak at fc can be equalized flat with
     minimal DSP effort.
  e) SEALED — Compact (Qtc ≈ 0.85)
     Net Volume: 36 liters
     System Resonance (fc): 82 Hz
     Qtc: 0.85
     HP Crossover: 80–120 Hz (24dB/oct LR recommended)
     Notes: Larger sealed enclosure with more useful bass
     extension. The fc of 82 Hz provides some stand-alone bass
     capability in smaller rooms, with room gain extending usable
     response into the 60s Hz. A practical option for portable
     systems where sealed construction simplicity and controlled
     rolloff are preferred over vented bass extension.
  f) SEALED — Moderate (Qtc ≈ 0.78)
     Net Volume: 50 liters
     System Resonance (fc): 75 Hz
     Qtc: 0.78
     HP Crossover: 70–100 Hz (24dB/oct LR recommended)
     Notes: Largest practical sealed alignment. Provides near-flat
     response with good bass extension. The 50-liter cabinet is
     substantial for a portable product, so this alignment is
     better suited to semi-permanent installation or larger
     portable systems where deep sealed bass is a priority over
     cabinet compactness.
SEALED NOTE: For this driver's Qts of 0.55, vented enclosures
provide significantly better bass extension in smaller cabinet
volumes. Sealed enclosures are recommended only when the simpler
construction, absence of port artifacts, or specific mid-bass
crossover integration are design priorities.
EXCURSION NOTE: The linear Xmax of 3.25 mm is modest for a 10",
reflecting the efficiency-first design philosophy. The driver
produces high SPL from its sensitivity (95 dB) rather than from
excursion-limited brute force. The triple roll surround provides
controlled mechanical excursion to 13.6 mm peak-to-peak for
transient peaks well beyond the linear range. In systems requiring
high output below 60 Hz, dedicated subwoofers should supplement
this driver.