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GZ ULTRA K-165
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GZ ULTRA K-165 – GENERAL SPECIFICATIONS
Speaker type 165 mm / 6.5” SQ midwoofer
Nominal impedance 4 ohms
Frequency Response 45 Hz – 5 kHz
Basket type Multipiece machined aluminum
Cone material Carbon-fleece sandwich cone
Motor High-grade Neodymium
Voice coil diameter 34 mm / 1.34”
Max. excursion (p2p)- Xmax 10 mm / 0.39“
Power handling (RMS) 100 Watts
Power handling (max) 160 Watts
Nominal diameter 165 mm / 6.5”
Mounting diameter 147 mm / 5.79”
Mounting depth 67 mm / 2.64”
GZ ULTRA K-165 – PARAMETERS
Resonance frequency - fs 43 Hz
Efficiency - SPL 87 dB
DC voice coil resistance - Re 3.4 ohms
Driver´s Q (nonelectrical losses only) - Qms 5.56
Driver´s Q (at fs) - Qes 0.56
Total driver´s Q - Qts 0.51
Air vol. compliant to driver´s suspension - Vas 20.4 L
Moving mass incl. acoustic load - Mms 15.4 g
Product of magnetic flux density - BL 5.05 N/A
Mech. resistance of driver´s suspension - Rms 0.75 kg/s
Compliance of driver´s suspension - Cms 0.88 mm/N
Voice coil inductance - LE 0.12 mH
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GZ ULTRA K-165 – FEATURES
◦ Ultra-high-end 165 mm / 6.5” midwoofer
◦ Tightly-tolerated technical parameters
◦ Lightweight carbon-fleece sandwich cone
◦ High-excursion linear moving rubber surround
◦ High-grade neodymium motor
◦ Vented voice coil former reducing distortion
◦ Round copper wire voice coil increasing power handling
◦ Fine-blasted, black anodized GZ-design basket from machined aluminum parts
◦ Optimized motor and voice coil ventilation
◦ Airflow-optimized aluminum cast spokes
◦ Generously dimensioned flexible spider-woven lead wires
◦ Gold plated terminals
◦ Documented final technical inspection
◦ Wooden box packaging / in matching pairs
◦ GZ ULTRA 165-GRILL protection grills available separately
symbolic illustration
5 mm / 0.20“
67 mm / 2.64“
147 mm / 5.79“
165 mm / 6.5“
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α 45°
Ø 165 mm / 6.5“
Ø 156,5 mm / 6.16“
Ø 147 mm / 5.79“
4,2 mm / 0.165“
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GZ ULTRA K-165
The most sensitive frequency range of human hearing is the midrange spectrum. In 2-way loudspeaker setups this
essential part of the audio signal used to be covered rather by the midwoofer than by the tweeter. For this reason,
the target of development must be a smooth, but wide band response starting from a low resonant frequency up to
the crossover point where the tweeter takes over. At the same time high-dynamical performance and consistent
Design follows function. In fact, the design of the ULTRA K-165 midwoofer is way more than just imposing
cosmetics. The unique basket consists of a set of machined aluminum parts providing maximum stability for the
moving parts but showing no disturbing influences owing to an air-flow optimized shape of the spokes.
Two layers of carbon-fleece, impregnated with a polymeric resin and a layer of special damping in-between are
united under high temperature and pressure resulting in a high-strength, exceptionally torsional-rigid but though
extremely lightweight sandwich cone. Together with a powerful high-grade neodymium motor, that´s the perfect
Not a huge surprise but a great honour, the performance of the GZ ULTRA K-165
and T-30 charmed the members of the EISA, a group of international car audio
trade journalists, right from the very first listening sessions that much that there
was any doubt about the decision to award these speakers as simply the
audio reproduction quality at each desired output level are major requirements.
basis for the intended purpose of a midwoofer driver, sounding and performing unrivaled great.
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