GZUA 6SQ

Owner’s Manual – EN / DE
CE Certificate of Conformity

High-performance SQ amplifier

6-channel sound quality amplifier with class A/B circuit, integrated active crossover and BIAS adjustment

6-channel SQ amplifier
Variable BIAS setting
Class AB technology
Variable active crossover with bypass function
Gold-plated connectors
Massiv heatsink with engraved Ground Zero lettering
Suitable for high quality SQ setups

Model	Sound quality amplifier
Channels	6
Output Power (@ 4Ω)	4x 110 + 2x 160 Watts RMS
Output Power (@ 2Ω)	4x 175 + 2x 280 Watts RMS
max. Output Power (CEA-2006A / 10%THD+N)	2x 425 + 650 Watts
Ouput power (@ 4Ω) bridged (CH1-4)	2x 340 Watts RMS
Frequency Response	10 Hz – 70 kHz
HPF / LPF / BPF	● / ● / ●
Bass Boost / Phase Shift	○ / ○
High-Level Input / Auto-on	○ / ○
Remote Control	○
BIAS Setting	●
Linkmode	○
Dimensions (w x l x h)	209 x 550 x 48 mm / 8.23 x 21.65 x 1.89″

GZUA 4SQ

23. May 2023 / By groundzero

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GZUA 4SQ

High-performance 4-channel SQ amplifier

Owner’s Manual – EN / DE
CE Certificate of Conformity

High-performance SQ amplifier

4-channel sound quality amplifier with class A/B circuit, integrated active crossover and BIAS adjustmenq

4-channel SQ amplifier
Variable BIAS setting
Class AB technology
Active crossover with bypass function
Soft delayed remote turn-on
Gold-plated connectors
Massiv heatsink with engraved Ground Zero lettering
Suitable for high quality SQ setups

Model	Sound quality amplifier
Channels	4
Output Power (@ 4Ω)	4x 115 Watts RMS
Output Power (@ 2Ω)	4x 185 Watts RMS
max. Output Power (CEA-2006A / 10%THD+N)	2x 440 Watts
Ouput power (@ 2Ω) bridged	2x 350 Watts RMS
Frequency Response	10 Hz – 70 kHz
HPF / LPF / BPF	● / ● / ●
Bass Boost / Phase Shift	○ / ○
High-Level Input / Auto-on	○ / ○
Remote Control	○
BIAS Setting	●
Linkmode	○
Dimensions (w x l x h)	209 x 360 x 48 mm / 8.23 x 14.17 x 1.89″

GZUA 2SQ

23. May 2023 / By groundzero

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GZUA 2SQ

High-performance 2-channel SQ amplifier

Owner’s Manual – EN / DE
CE Certificate of Conformity

High-performance SQ amplifier

2-channel sound quality amplifier with class A/B circuit, integrated active ecrossover and BIAS adjustment

2-channel SQ amplifier
Variable BIAS setting
Class AB technology
Variable active crossover with bypass function
2 ohms stable in bridged mode
Soft delayed remote turn-on
Gold-plated connectors
Massiv heatsink with engraved Ground Zero lettering
Bass remote control included
Suitable for high quality SQ setups

Model	Sound quality amplifier
Channels	2
Output Power (@ 4Ω)	2x 175 Watts RMS
Output Power (@ 2Ω)	2x 300 Watts RMS
Output Power (@ 1Ω)	2x 485 Watts RMS
max. Output Power (CEA-2006A / 10%THD+N)	1180 Watts
Ouput power (@ 2Ω) bridged	1000 Watts RMS
Frequency Response	10 Hz – 70 kHz
HPF / LPF / BPF	● / ● / ●
Bass Boost / Phase Shift	● / ●
High-Level Input / Auto-on	○ / ○
Remote Control	●
BIAS Setting	●
Linkmode	○
Dimensions (w x l x h)	209 x 360 x 48 mm / 8.23 x 14.17 x 1.89″

GZCM 8.0N-PROX

23. May 2023 / By groundzero

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GZCM 8.0N-PROX

200 mm / 8″ high power midrange speaker with neodymium motor

500 Watts max

200 mm / 8″ high end SPL midrange speaker with neodymium motor and aluminum cast basket

8″ high power midrange speaker with neodymium motor
63 mm / 2.5″ CCA voice coil
Fiber reinforced paper cone
Neodymium motor
Aluminum cast basket
Aluminum phase plug
water repellend cone
Incl. protection grill
Push terminal
1 piece / package

Model	High end midrange speaker with neodymium magnet
Diameter	200 mm / 8″
Power handling (RMS/max.)	300 / 500 Watts
Impedance	4 Ohms
Efficiency	98 dB
Frequency Response	120 Hz – 7 kHz
Voice coil	63 mm / 2.5″ CCA
Mounting Ø	181 mm / 7.13″
Mounting depth	82 mm / 3.23″

GZRW 300-D2 FLAT

22. May 2023 / By groundzero

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GZRW 300-D2 FLAT

30 cm / 12″ high quality subwoofer

450 Watts RMS

12” subwoofer with shallow installation depth

12″ flat subwoofer
Efficient ferrite motor
Paper sandwich cone
Durable rubber surround
Shallow GZ-design steel basket
50 mm / 2″ copper voice coil
Polycot spider
Aluminum dust cap

Model	High-Quality SPL Subwoofer
Diameter	30 cm / 12″
Power handling (RMS)	450 Watts
Impedance	2x 2 Ohms
Efficiency	84 dB
Power recommendation	200 – 800 Watts
Voice coil	50 mm / 2″ copper
Cone	Paper sandwich cone
Max. Excursion (Xmax)	30 mm / 1.18″
Mounting diameter	278 mm / 10.94″
Mounting depth	93 mm / 3.66″
Resonance frequency (Fs)	23.5 Hz
Damping ratio (Qts)	0.44
Equiv. air volume (Vas)	60,2 L / 2.13 cu.ft.

GZRW 250-D2 FLAT

22. May 2023 / By groundzero

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GZRW 250-D2 FLAT

25 cm / 10″ high quality SPL subwoofer

400 Watts RMS

10” subwoofer with shallow installation depth

10″ flat subwoofer
Efficient ferrite motor
Paper sandwich cone
Durable rubber surround
Shallow GZ-design steel basket
50 mm / 2″ copper voice coil
Polycot spider
Aluminum dust cap

Model	High-Quality SPL Subwoofer
Diameter	25 cm / 10″
Power handling (RMS)	400 Watts
Impedance	2x 2 Ohms
Efficiency	84 dB
Power recommendation	200 – 800 Watts
Voice coil	50 mm / 2″ copper
Cone	Paper sandwich cone
Max. Excursion (Xmax)	22 mm / 0.87″
Mounting diameter	232 mm / 9.13″
Mounting depth	85 mm / 3.35″
Resonance frequency (Fs)	28 Hz
Damping ratio (Qts)	0.54
Equiv. air volume (Vas)	35.8 L / 1.26 cu.ft.

GZNM 80SQ-K

22. May 2023 / By groundzero

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GZNM 80SQ-K

80 mm / 3.15″ SQ midrange speaker with supreme sound quality

110 Watts max

3.15″ high performance midrange speaker with Kevlar® cone

80 mm / 3.15″ midrange SQ loudspeaker
20 mm / 0.79″ voice coil
High-tech Kevlar® cone
High-efficient, linearized neodymium motor
GZ-design aluminum cast basket
GZ-design hexagon style NRG protection grill
Goldplated soldering terminal
1 pair / package

Model	High performance midrange speaker
Diameter	80 mm / 3.15″
Power handling (RMS/max.)	70 / 110 Watts
Impedance	4 Ohms
Efficiency	88 dB
Frequency Response	150 Hz – 5000 Hz
Voice coil	20 mm / 0.79″
Cone	Kevlar®
Magnet material	Neodymium
Mounting diameter	77 mm / 3.03″
Mounting depth	39 mm / 1.54″
Resonance frequency (Fs)	97 Hz

GZCT 20N-PRO

22. May 2023 / By groundzero

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GZCT 20N-PRO

25 mm / 1″ high end compression tweeter with neodymium motor

100 Watts max

1″ high end compression tweeter with neodymium magnet

25 mm / 1″ high end compression tweeter
25 mm / 1″ CCA voice coil
Polyester dome
Neodymium motor
Aluminum cast horn
Circular wave guide
Soldering terminal
1 piece / package

Model	High end compression tweeter with neodymium magnet
Diameter	25 mm / 1″
Power handling (RMS/max.)	30 / 100 Watts
Impedance	4 Ohms
Efficiency	109 dB
Frequency Response	3000 Hz – 22 kHz
Voice coil	25 mm / 1″ CCA
Dome	Polyester
Mounting Ø	44 mm / 1.73″
Mounting depth	29 – 48 mm / 1.14 – 1.89″

GZCF 200NEO-PRO

22. May 2023 / By groundzero

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GZCF 200NEO-PRO

200 mm / 6.5″ High-power full range loudspeaker for active use

400 + 100 Watts max

200 mm / 8″ 2-way coaxial speaker system with coated paper cone and 25 mm / 1″ compression tweeter

2-way high-power coaxial loudspeaker system
Coated paper cone
Wave shaped textile surround
High-efficient neodymium motor
Aluminum cast basket
High efficiency (SPL)
25 mm / 1″ compression tweeter
High-efficient neodymium motor
For active use
Incl. Hexagon style protection grill

Model	2-way coaxial speakers for active use
Diameter	200 mm / 8″
Power handling (RMS/max.)	250+50 / 400+100 Watts
Impedance	4 + 4 ohms
Efficiency	99 dB
Frequency Response	120 Hz – 20 kHz
Tweeter	25 mm / 1″ PEI
Mounting Ø	181 mm / 7.13″
Mounting depth	104 mm / 4.09″
Xmax (p2p)	12 mm / 0.47″

GZCT 28M-SPL

22. May 2023 / By groundzero

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GZCT 28M-SPL

High-performance 28 mm / 1.1″ dome tweeter

110 Watts max

28 mm, 1.1″ dome tweeter with surface housing and in-line high pass filter

High-performance Mylar dome tweeter
28 mm / 1.1″ voice coil
Mylar dome
Neodymium motor
Incl. 12 dB/oct high pass filter
Ferrofluid cooled
1 pair / package

Model	High-performance tweeter with Mylar dome
Diameter	28 mm / 1.1″
Power handling (RMS/max.)	80 / 110 Watts
Impedance	4 Ohms
Efficiency	86 dB
Frequency Response	2500 Hz – 20 kHz
Crossover frequency	5500 Hz
Voice coil	28 mm / 1.1″
Dome	Mylar
Mounting Ø	48 mm / 1.89″
Mounting depth	16 mm / 0.63″

GZDB 4.50/8.20 MANL

22. May 2023 / By groundzero

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GZDB 4.50/8.20 MANL

Distribution block

4x 50 mm² / 0 AWG input / 8x 20 mm² / 4 AWG output

Solid distribution block with screw terminals

Power or ground distribution block
4x 50 mm² / 0 AWG input / 8x 20 mm² / 4 AWG output
Anodyzed solid copper
Including protection cover
Screw terminals with reducing sleeves

GZSC 2-1.50X

29. March 2023 / By groundzero

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GZSC 2-1.50X

2x 1.50 mm² speaker wire

Speaker wire

2x 1.5 mm² speaker wire / roll

High quality speaker cable
CCA multi braid wire
Plastic spool
200 m / 656 ft spool

GZPK 165SQ-C

3. March 2023 / By groundzero

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GZPK 165SQ-C

165 mm / 6.5″ high end midwoofer

200 Watts max

6.5″ high end midwoofer with GZ-design aluminum cast basket offering unique ventilation

6.5″ high end midwoofer
38 mm / 1.5″ voice coil
Aluminum-ceramics cone
High-efficient hybrid motor with neodymium and ferrite magnets
Lightweight, 2-layer copper clad aluminum voice coil
GZ-design hexagon style NRG* protection grill with logo option
Gold-plated GZ-design screw terminal
Chrome plated magnet cover
Optimized using the renowned Klippel® measurement system
1 pair / package

Model	High-quality SQ midwoofer
Diameter	165 mm / 6.5″
Power handling (RMS/max.)	140 / 200 Watts
Impedance	4 Ohms
Efficiency	89 dB
Frequency Response	40 Hz – 5000 Hz
Voice coil	38 mm / 1.5″
Cone	Aluminum-ceramics
Mounting Ø	144 mm / 5.67″
Mounting depth	70 mm / 2.76″
Resonance frequency (Fs)	38 Hz

GZNK 165SQ-K

3. March 2023 / By groundzero

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GZNK 165SQ-K

165 mm / 6.5″ SQ midwoofer with supreme sound quality

190 Watts max

6.5″ high performance midwoofer with GZ-design aluminum cast basket offering unique ventilation

6.5″ SQ midwoofer
38 mm / 1.5″ voice coil
High-tech Kevlar® cone
Impedance linearizing copper cap
Aluminum cast housing
GZ-design aluminum cast basket
GZ-design hexagon style NRG protection grill with logo option
Gold plated screw and soldering terminal
1 pair / package

Model	High-quality SQ midwoofer
Diameter	165 mm / 6.5″
Power handling (RMS/max.)	130 / 190 Watts
Impedance	4 Ohms
Efficiency	88 dB
Frequency Response	40 Hz – 5 kHz
Voice coil	38 mm / 1.5″
Cone	Kevlar
Magnet material	Neodymium-ferrite hybrid system
Mounting Ø	144 mm / 5.67″
Mounting depth	70 mm / 2.76″
Resonance frequency (Fs)	43 Hz

GZCS T-25S

3. March 2023 / By groundzero

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GZCS T-25S

25 mm / 1″ tweeter

80 Watts max

25 mm / 1″ tweeter

Universal application
2-step level adjustment
Coated soft dome
12 dB/oct in-line high pass filter
Compatible with diverse midwoofers
Neodymium motor
25 mm / 1″ silk dome tweeter
1 pair / package

Model	25 mm / 1″ tweeter
Diameter	25 mm / 1″
Power handling (RMS/max.)	50 / 80 Watts
Impedance	4 Ohms
Efficiency	87 dB
Frequency Response	4 kHz – 20 kHz
Voice coil	25 mm / 1″ copper
Mounting Ø	44 mm / 1.73”
Mounting depth	22 mm / 0.87”
Resonance frequency (Fs)	1460 Hz

GZCS T-25VW

3. March 2023 / By groundzero

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GZCS T-25VW

Car specific 25 mm / 1″ tweeter

Plug´n´play installation

Car specific 25 mm / 1″ tweeter for VW and identical brands

Coated soft dome
12 dB/oct in-line high pass filter
Adapter frame for two different mounting positions
Neodymium motor
25 mm / 1″ silk dome tweeter
Car specific connection
1 pair / package

Model	Car specific tweeter for VW and identical brands
Diameter	25 mm / 1″
Power handling (RMS/max.)	50 / 80 Watts
Impedance	4 Ohms
Efficiency	87 dB
Frequency Response	4 Hz – 20 kHz
Voice coil	25 mm / 1″ copper
Tweeter	Coated soft dome

GZCS K-200VW

3. March 2023 / By groundzero

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GZCS K-200VW

Car specific 200 mm / 8″ midrange speaker

Plug´n´play installation

Car specific 200 mm / 8″ midrange speaker for VW and identical brands

compatible with VW and identical brands
Retrofit or replacement for factory loudspeakers
Coated paper cone
Powerful ferrite motor
Resonance free steel basket
6 dB/oct in-line low pass filter
Car specific connection
1 pair / package

Model	Car specific midrange speaker
Diameter	200 mm / 8″
Power handling (RMS/max.)	80 / 120 Watts
Impedance	3 Ohms
Efficiency	89 dB
Frequency Response	40 Hz – 4.5 kHz
Voice coil	38 mm / 1.5″ copper
Cone	Reinforced paper
Mounting Ø	180 mm / 7.10″
Mounting depth	70 mm / 2.76″
Resonance frequency (Fs)	48 Hz
Damping ratio (Qts)	0.61
Equiv. air volume (Vas)	30.3 L / 1.01 ft³

GZCS K-165VW

3. March 2023 / By groundzero

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GZCS K-165VW

Car specific 165 mm / 6.5″ midrange speaker

Plug´n´play installation

Car specific 165 mm / 6.5″ midrange speaker for VW and identical brands

compatible with VW and identical brands
Retrofit or replacement for factory loudspeakers
Coated paper cone
Powerful ferrite motor
Resonance free steel basket
6 dB/oct in-line low pass filter
VW-specific (and identical) mounting rim
Car specific connection
1 pair / package

Model	Car specific midrange speaker
Diameter	165 mm / 6.5″
Power handling (RMS/max.)	70 / 100 Watts
Impedance	3 Ohms
Efficiency	87 dB
Frequency Response	50 Hz – 5 kHz
Voice coil	38 mm / 1.5″ copper
Cone	Reinforced paper
Mounting Ø	142 mm / 5.59″
Mounting depth	62 mm / 2.44″
Resonance frequency (Fs)	60 Hz
Damping ratio (Qts)	0.61
Equiv. air volume (Vas)	11.4 L / 0.40 ft³

GZCS 100.2BMW

3. March 2023 / By groundzero

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GZCS 100.2BMW

Car specific 100 mm / 4″ 2-way speaker system

Plug´n´play installation

Car specific 100 mm / 4″ 2-way speaker system for BMW

2-way speaker
Suitable for various vehicles
Glas fiber cone
neodymium motor
GZ design aluminum cast basket
GZ design aluminum mounting frame for BMW
25 mm / 1″ silk dome tweeter
Car specific connection
1 pair / package

Model	Car specific 2-way speakers
Diameter	100 mm / 4″
Power handling (RMS/max.)	70 / 110 Watts
Impedance	4 Ohms
Efficiency	87 dB
Frequency Response	70 Hz – 24 kHz
Voice coil	25 mm / 1″ copper
Midwoofer	Glass fiber cone

Crossover install information

GZCS 100MB-C

3. March 2023 / By groundzero

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GZCS 100MB-C

Car specific 100 mm / 4″ center speaker

Plug´n´play installation

Car specific 100 mm / 4″ center speaker for Mercedes

Center speaker for MERCEDES
Suitable for various vehicles
Glas fiber cone
neodymium motor
Car specific compound basket
Neodymium motor
Car specific connection
1 piece / package

Model	Car specific center speaker
Diameter	100 mm / 4″
Power handling (RMS/max.)	40 / 60 Watts
Impedance	4+4 ohms
Efficiency	82 dB
Frequency Response	100 Hz – 17 kHz