ONYX
OWC254 / OWC304
Thank you for choosing the MB Quart ONYX subwoofer for your car audio sound
system. With proper installation, you are on the path to experiencing your music in a
way you only imagined possible. Here at MB Quart, we call this “Sound In Every Detail.”
The ONYX series subwoofers have been designed for the enthusiast looking for
accurate bass and solid reliability in their woofer. The ONYX series subwoofers
feature the following:
- Injection Molded Polypropylene Cone
- UV Resistant Butyl Rubber Surround
- 1.5” High Temp Voice Coil
- Red Nomex Spider
- Push & Insert Style Speaker Terminals
- Deep Drawn Stamp Steel Basket
- Heat-Dispersing Vented Pole Plate
- Anti-Resonant Magnet Cover
OWC254 / OWC304
OWC254 / OWC304
Index
OWC254 - Technical Data
OWC304 - Technical Data
WIRING DIAGRAMS - DVC 4-Ohm Models
THIELE SMALL PARAMETERS & BOX DESIGNS
SUBWOOFER INSTALLATION DIRECTIONS
GLOSSARY OF TERMS
2
3
4
5
6
7
1
OWC254
260mm / 10.24”
130.3mm / 5.13”
83.96
83.96
118.5mm / 4.67”
175-350
4
35-250
25.4 cm / 10”
175-350
4
35-250
228mm / 8.98”
175-350
83.96
35-250
25.4 cm / 10”
175-350
4
83.96
35-250
4
175-350
4
83.96
35-250
25.4 cm / 10”
175-350
4
83.96
35-250
25.4 cm / 10”
25.4 cm / 10”
25.4 cm / 10”
2
OWC304
315.3mm / 12.41”
153.5mm / 6.04”
84.6
30.48 cm / 12”
84.6
139.4mm / 5.49”
175-350
4
35-250
175-350
4
35-250
278mm / 10.94”
175-350
4
84.6
35-250
30.48 cm / 12”
175-350
4
84.6
35-250
175-350
4
84.6
35-250
30.48 cm / 12”
175-350
4
84.6
35-250
30.48 cm / 12”
30.48 cm / 12”
30.48 cm / 12”
3
OWC254 / OWC304
DVC 4-Ohm Coil Wiring
PARALLEL COILS
1+ 1-
2- 2+
SERIES COILS
1+ 1-
-
+
2- 2+
-
2-Ohms
+
8-Ohms
PARALLEL COILS / PARALLEL SUBS
1+ 1-
1 2
2- 2+
-
+
1+ 1-
-
1-Ohm
+
2- 2+
SERIES COILS / PARALLEL SUBS
1+ 1-
1 2
2- 2+
-
+
1+ 1-
-
4-Ohms
+
2- 2+
SERIES COILS / PARALLEL SUBS
1+ 1-
1 2
2- 2+
-
+
1+ 1-
2- 2+
1+ 1-
-
3
+
2- 2+
SERIES COILS / PARALLEL SUBS
1+ 1-
1 2
2- 2+
-
+
1+ 1-
2- 2+
-
+
1+ 1-
-
3
+
2- 2+
1+ 1-
4
2- 2+
-
2.66-Ohms
+
-
2-Ohm
+
4
OWC254 / OWC304
5
OWC254 / OWC304
SUBWOOFER INSTALLATION DIRECTIONS
Enclosure Materials
Typically, 5/8” or 3/4” MDF (Medium Density Fiber Board) is best
for most applications. 3/4” MDF is recommended.
Enclosure Build Materials
Connecting joints need to be glued and screwed to ensure no
air escapes and joints do not separate under high pressure.
Mitered and rabbit joints also help to ensure the enclosure joints
are secure.
Bracing
Internal bracing is also recommended to prevent flexing and to
strengthen the enclosure.
Note: The volume taken up by the bracing should be added to the
total enclosure interior volume.
There are two common bracing methods.
1. Corner Bracing: These help prevent the connection joints
from separating under heavy vibration and air pressure.
Use 1” x 1” MDF at all interior joints
2. Diagonal Bracing: These internal braces connect the top side
to the bottom side as well front side to back side. This prevents
the wood from bowing or pushing outwards.
Use 1” x 2” with 1” surface contact that is glued and screwed.
6
OWC254 / OWC304
Glossary of Terms
Q The energy losses of relative damping (ratio of stored to dissipated
energy or ratio of reactive to resistive energy).
Fs Free air resonance of driver in Hz.
Qms Mechanical Q.
Vas Volume of air equivalent to driver from the rest position.
Cms Mechanical compliance of a loud speaker piston.
Mms Moving mass of total loud speaker piston assembly.
Xmax The maximum linear excursion of a loud speaker.
Sd Surface area of the cone.
Dia The piston diameter of a loud speaker.
Qes Electrical Q of a system.
Re DC resistance.
Le VC inductance.
Pe Maximum input power.
Qts Total Q of the system.
Sens Sensitivity. An efficiency measurement in dB’s.
Vc Volume of a closed or sealed enclosure
Vb Volume of a vented enclosure.
Fc The resonant frequency of a closed or sealed system
Fb The resonant frequency of a vented system
F3 The half-power (-3dB) frequency of a loud speaker enclosure
Qtc The Q of a loud speaker at Fc in a closed box, considering both
it’s electrical and mechanical resistance.
QL The Q of a vented box, resulting from all box losses.
DV Diameter of vent.
LV Length of vent.
H Height.
W Width.
D Depth
7
MAXXSONICS USA, INC
1290 Ensell Road
Lake Zurich, Illinois 60047 USA
E-Mail: info@maxxsonics.com
Website: www.maxxsonics.com
www.mbquart.com
Maxxsonics Limited Warranty
As the manufacturer of Maxxsonics, Autotek, Crunch, MB Quart and Hifonics car audio
products, Maxxsonics USA Inc. Warrants to the original consumer purchaser the
amplifier to be free from defects in material and workmanship for one (1) Year from
date of purchase.
All other parts and accessories of the system are warrantied to be free from defects in
material and workmanship for one (1) year from date of purchase. Maxxsonics will
repair or replace at it’s option and free of charge during the warranty period, any system
component that proves defective in materials and workmanship under normal installation,
use and service provided that the product is returned to the authorized Maxxsonics dealer
from where it was purchased. A photo copy of the original receipt must accompany the
product being returned.
Valid purchase receipts will contain the name and address of the authorized reseller.
Any damage to the product as a result of misuse, abuse, accident, incorrect wiring,
improper installation, alteration of date code or bar code labels, revolution, natural
disaster, or any sneaky stuff because someone messed up, repair or alteration out side
of our factory or authorized service centers and any thing else you have done that you
should not have done is not covered.
This warranty is limited to defective parts and specifically excludes any incidental
or consequential damages connected therewith. This warranty is not to be construed
as an insurance policy.
Warranty on installation labor, removal, re-installation and freight charges are not the
responsibility of Maxxsonics USA Inc.
Warranty products damaged as a result of insufficient or improper packing materials
are not covered by this limited warranty and such damaged product will be returned
“as is” at the expense of the owner.
OWC254 / OWC304
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