BlieSMa M74B-6 74mm midrange speakers Berylium dome 6 ohm

Bliesma M74B-6 features large beryllium dome for low non-lineal distrotions. Moving mass of the driver is as low as 1.8 g.

Single-layer ribbon voice coil of Bliesma M74B-6 is wound with copper-clad aluminum wire (CCAW) on titanium former. Wire terminals are gold plated.

Beryllium dome of Bliesma M74B-6 midrange is protected with grill. Thick aluminium mounting flange is black powder coated, aluminium rear chamber is filled with natural wool damping.

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Characteristics :

• 74 mm beryllium lens extremely low distortion
• Best impulse response and highest efficiency (97dB @ 2.83V) of the dome midrange drivers
• Recommended frequency range 400 Hz-8 kHz
• Membrane resonance at about 15kHz
• Extremely low moving mass for even better dynamics, even better response and even higher efficiency
• Fully saturated copper-capped neodymium motor for low non-linear distortion and exceptionally low intermodulation distortion 2.4 mm linear excursion and large vent channel for undistorted playback at low frequencies
• Flush-mounted surround and rear-mounted magnet system for a flat frequency response and a wide off-axis response.
• No ferrofluid for improved dynamics
• Copper-coated aluminum underhung voice coil on titanium bobbin
• Flexible and lightweight connection wires, made in Denmark
• Thick, powder-coated aluminum flange
• Aluminum rear chamber with natural wool damping
• Gold plated wire connectors

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Specifications :

• Nominal Impedance: 6Ω
• Rated power*: - W
• Sensitivity 2.83V/1m: 97dB
• Net Weight: 0.68kg
• Effective piston area: Sd 50.25 cm²
• Moving mass, mms: 1.8 g
• Force factor: Bl 6.8 T*m
• Resonance frequency: Fs 440Hz
• Mechanical Q factor: Qms 7.6
• Electrical Q factor, Qes 0.94
• Overall Q-Factor: Qts 0.84
• Magnetic Flux Density: 1.35T
• Air Gap Height: 4.2mm
• Linear Excursion (p-p): 2.4mm
• Voice coil diameter: 74 mm
• Voice coil height: 1.8 mm
• Voice coil layers: 1
• Voice coil inductance: Le 0.036 mH
• DC resistance: Re 5.6Ω
• Wire Material: CCAW
• * IEC 268-5, 2nd order high-pass Butterworth filter, 400 Hz