Page 1
GZPW REFERENCE 250
GROUND ZERO GmbH – Erlenweg 25 – 85658 Egmating – Germany
GroundZeroAudioCom
www.ground-zero-audio.com
info@ground-zero-audio.com
Page 2
Product name
GZPW Reference 250
Product type
Subwoofer chassis
H.Art .nr.
125053
Diameter
275 mm / 10.8“
Mounting diameter
235 mm / 9.25“
Mounting depth
128 mm / 5.04“
Magnet dimension
2 x 133x 19 mm
Total weight
5,1 KG / 11.244 lb
Voice coil diameter
50 mm / 2 “ Round Wire
Voice coil winding height
35 mm / 1.38“
Voice coil wire material
Copper
Voice coil former material
Glass Fiber
Top plate height
6 mm / 0.236“
Linear excursion (one direction)
15 mm / 0.59 “
Effective Xmax
40 mm / 1.57“
Top Plate and T-Yoke color
Black
Basket material
Aluminium Cast
Basket color
Black matt
Spider
1x BIMAX
1x Connex
Surround
Rubber
Cone
3 Layer Sandwich
Dustcap
Pressed paper
Magnetcover
Machined & polished Alu
Gasket
Aluminum
Terminal
Chrome push terminal
Power handling
500 WRMS
Impedance
2 x 2 Ohm
Re
3.8 Ohm
Res
54.7 Ohm
FS
31.3 Hz
Qms
7.22
Qes
0.43
Qts
0.40
Rms
3.2 kg/s
Cms
0.22 mm/N
Mms
119.1 gr
BL
14.4 N/A
SPL
86 dB
VAS
36.5 L / 1.29 cu.ft
Le
0.94 mH
Recommended freq. response
20 – 60 Hz
Subsonic: 20Hz @ min24dB
LPF: 50 - 60Hz @ min 12dB
Recommended amplifier power
300 – 600 WRMS @ 4 Ohm (1 Ohm)
Sound Quality
JJJJJJ (max. JJJJJJ)
SPL Competition
(max. JJJJJJ)
Low bass performance 20-50Hz
JJJJJJ (max. JJJJJJ)
Mid bass performance 50-80Hz
JJJJJJ (max. JJJJJJ)
GZPW REFERENCE 250
A
275 mm / 10.8“
B
235 mm / 9.25“
C
128 mm / 5.04“
D
142 mm / 5.59“
E
6 mm / 0.236“
TECHNICAL SPECIFICATIONS
A
D
B
C
E
GROUND ZERO GmbH – Erlenweg 25 – 85658 Egmating – Germany
GroundZeroAudioCom
www.ground-zero-audio.com
info@ground-zero-audio.com
Page 3
GZPW REFERENCE 250
BOX RECOMMENDATION
A
A
B
D
V
L
C
C
a
L2
B
V
L1
b
Small size vented box for punchy bass
V: 32 L / 1.13 cu.ft
D: 80 mm / 3.15“
L: 300 mm / 11.8“
Tuning: 36 Hz
F3: 34 Hz
Outer dimensions based on 22 mm / 0.87“ Wood:
A: 520 mm / 20.5“
B: 350 mm / 13.8“
C: 300 mm / 11.8“
Polyester damping behind the port
Medium size vented box for extremely low bass
V: 35 L / 1.24 cu.ft
Portarea:
a: 300 mm / 11.8“
b: 25 mm / 0.98“
L1: 280 mm / 11“
L2: 270 mm / 10.63“
Port thickness: 22 mm / 0.87“
Tuning: 31 Hz
F3: 32 Hz
Port rounded inside and outside!!
Outer dimensions based on 22 mm / 0.87“ Wood:
A: 620 mm / 24.4“
B: 302 mm / 11.89“
C: 344 mm / 13.54“
Polyester damping behind the woofer
V
Die hier aufgeführten Gehäusevorschläge sind nur einige, der möglichen Varianten.
Bitte beachten Sie zudem, dass die finale Abstimmung, speziell die Port Längen je nach Fahrzeug und eigenem Geschmack variiert werden sollte.
Above-mentioned enclosure recommendations are just a few possible variations.
Please note that you should find the perfect tuning, especially port length, based on your car and own taste.
GROUND ZERO GmbH – Erlenweg 25 – 85658 Egmating – Germany
Small size sealed box
V: 12 – 25L / 0.42 – 0.88 cu.ft
Qtc: 0.82 – 0.62
F3: 54 Hz
40 - 60% Sheep whool
GroundZeroAudioCom
www.ground-zero-audio.com
info@ground-zero-audio.com
Page 4
GZPW REFERENCE 250
Curve
Type
Volume
F3/ Qtc
Black
Vented
32 L / 1.13 cu.ft
33 Hz
Green
Vented
35 L / 1.24 cu.ft
32 Hz
Yellow
Sealed
12 L / 0.42 cu.ft
54 Hz / 0.82
Blue
Sealed
18 L / 0.64 cu.ft
54 Hz / 0.70
Red
Sealed
25 L / 0.88 cu.ft
54 Hz / 0.62
Die hier aufgeführten Gehäusevorschläge sind nur einige, der möglichen Varianten.
Bitte beachten Sie zudem, dass die finale Abstimmung, speziell die Port Längen je nach Fahrzeug und eigenem Geschmack variiert werden sollte.
Above-mentioned enclosure recommendations are just a few possible variations.
Please note that you should find the perfect tuning, especially port length, based on your car and own taste.
GROUND ZERO GmbH – Erlenweg 25 – 85658 Egmating – Germany
GroundZeroAudioCom
www.ground-zero-audio.com
info@ground-zero-audio.com
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