- Very high efficiency midrange
- Ultra low harmonic distortion
- High power handling
- The 6NPM is a very high efficiency, (97 dB 1watt / 1 meter in 1l enclosure) 6-inch midrange speaker with incredibly linear frequency response characteristics and ultra low harmonic distortion artifacts. The 6NPM has extremely high sound quality. The 6NPM uses a lightweight paper pulp, specifically developed for this application. This unique cone provides the ideal weight to strength ratio.Voice CoilAt the core of the 6NPM is
- it’s voice coil technology featuring edge wounded aluminum ribbon wire. Unique lightweight and very short former provides the ideal transfer of power between the voice coil and the cone assembly and assists in reducing the distortion artifacts. By combining this material with the state of the art adhesives, the 6NPM delivers incredible performance.The neodymium magnet is in a direct contact with the CNC exposed aluminum section
- of the basket, hold in place by our thermal transfer adhesives. This design dramatically improves the heat transfer. Further more, based upon a request, we have developed added on aluminum heat-sink. The heat-sink is a recommended optional accessory for applications in sealed mid-range, low volume enclosures.
General specs Nominal Diameter: 6 in. Rated Impedance: 8 Ohm Power handling AES Power: 180 Watts Program Power: 360 Watts Voice Coil Diameter: 1.75 in. Winding wire: Aluminum Former: kapton Winding height: 6.8 mm T/S Parameters Resonant frequency: 150 Hz Re: 6.9 ohm Qes: 0.38 Qms: 4.58 Qts: 0.35 Vas: 2.9 liters Sd: 143.1 cm2 Mms: 11.1 grams Bl: 13.7 Le: 0.16 mH Sensitivity: 96.79 dB Design details Surround Material: Fabric Cone material: Paper Spider: Nomex Plate thickness: 6 mm Peak to peak linear cone Displacement 7.2 mm Overall diameter: 162 mm Bolt circle diameter: 172 mm Baffle cutout dia.: 145 mm Number of mounting holes: 4 Depth (flange to rear): 52.5 mm Net weight: 1.2 kg Ordering codes: 8 ohm version: 6NPMX8-164 Recone kits: Download: Spec download 2D drawing 3D model
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PRODUCT CODE: 6NPMX8-164
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--- ENCLOSURE RECOMMENDATIONS ---
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ENCLOSURE RECOMMENDATIONS: 6NPMX8-164
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Driver: 6NPMX8-164 (6NPM) — 6.5" Midrange
Key T/S: Fs=150Hz, Qts=0.35, Vas=2.9L, Sens=96.8dB 1W/1m
Power: AES 180W / Cont 360W / Peak 720W
Xmax=0.4mm, Sd=143.1cm², Bl=13.7T·m, Re=6.9Ω
Voice Coil: 1.75" aluminum edge-wound on glass fiber former
Magnet: Neodymium | Cone: Paper pulp | Surround: Fabric
RECOMMENDED ENCLOSURE TYPE: Sealed
NOTE: This is a high-efficiency midrange driver with Fs=150Hz and
very low Vas (2.9L). Small sealed enclosures raise the system
resonance well above the intended crossover point (typically 300–500Hz)
and provide controlled acoustic loading for maximum SPL in the
midrange passband. The low Qts (0.35) allows very compact sealed
volumes without excessive peaking.
SEALED ALIGNMENTS:
a) High SPL (Qtc ≈ 1.0)
Net Volume: 0.4 liters
System Resonance (fc): 429 Hz
Qtc: 1.0
Response: Slight broad peak near fc, maximum output in passband
Crossover HP: 400–500 Hz (24dB/oct LR recommended)
Notes: Maximum acoustic output in midrange passband; the elevated
Qtc provides a gentle lift near system resonance that can be EQ'd
flat or used as a passband boost. Ideal for high-SPL touring
applications where maximum output per driver is required.
b) Balanced (Qtc ≈ 0.85)
Net Volume: 0.6 liters
System Resonance (fc): 364 Hz
Qtc: 0.85
Response: Slightly warm, smooth transition through resonance
Crossover HP: 300–400 Hz (24dB/oct LR recommended)
Notes: Good compromise between SPL output and response flatness.
Suitable for most professional midrange applications including
line arrays, point-source cabinets, and stage monitors.
c) Extended / Butterworth (Qtc ≈ 0.707)
Net Volume: 1.0 liters
System Resonance (fc): 303 Hz
Qtc: 0.707
Response: Maximally flat amplitude, textbook Butterworth alignment
Crossover HP: 250–350 Hz (24dB/oct LR recommended)
Notes: Flattest possible sealed response. Lower system resonance
allows a lower crossover point. Best for applications prioritizing
accuracy and smooth crossover integration over maximum SPL.
THERMAL NOTE: The neodymium motor assembly is in direct thermal contact
with the CNC-machined aluminum basket section. For sustained high-power
operation in small sealed volumes (especially ≤0.6L), the optional
bolt-on aluminum heatsink is recommended to manage voice coil temperature.
--- AI SUMMARY (copy/paste ready) ---
The 6NPMX8-164 is a 6.5-inch high-efficiency neodymium midrange driver designed for professional sound reinforcement systems requiring high sensitivity (97 dB 1W/1m) and controlled, low-distortion reproduction in the 300–5000 Hz range. It features a lightweight paper pulp cone on a fabric surround, driven by a 1.75-inch edge-wound aluminum voice coil on a glass fiber former. The motor and suspension are optimized to maintain consistent performance at high drive levels, with controlled excursion and reduced thermal compression during long-term operation.
In sealed enclosures, the driver is intended for very compact net internal volumes of 0.4 to 1.0 liters, producing system resonances between 300 and 430 Hz. Smaller volumes (0.4–0.6 liters, Qtc 0.85–1.0) maximize acoustic output in the midrange passband, providing a broad sensitivity lift that can be used directly for high-SPL applications or equalized flat via DSP. Larger volumes approaching 1.0 liters yield a Butterworth-class response (Qtc 0.707) with maximally flat amplitude, better suited to applications where accuracy and smooth crossover integration are priorities. The very low Vas (2.9 liters) and moderate Qts (0.35) make this driver particularly well-suited to the small sealed chambers found in professional line array modules, compact coaxial cabinets, and horn-loaded midrange systems.
The driver is rated for approximately 180 W AES / 360 W continuous power handling and requires active DSP crossover management. A high-pass filter in the range of 300–500 Hz (24 dB/octave Linkwitz-Riley recommended) should be set according to the chosen enclosure volume and system architecture. The neodymium motor provides direct thermal coupling to the aluminum basket, and an optional bolt-on aluminum heatsink is available for sustained high-power operation in sealed low-volume enclosures where thermal management is critical.
This driver is particularly effective in professional touring line arrays, compact point-source loudspeakers, coaxial monitor systems, and horn-loaded midrange applications, where high sensitivity, low distortion, and compact enclosure requirements are priorities.
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