Hifonics MT Olympus series Technical manual
XXV
MT OLYMPUS
SUBWOOFERS
MT OLYMPUS SERIES
CAR AUDIO SUBWOOFERS
Congratulations on your purchase of the new Hifonics MT OLYMPUS
Series High Power subwoofer system. The MT OLYMPUS subwoofer
series offer superior sonic accuracy, intense high power sound quality
with exotic build materials and outstanding good looks. These
subwoofers are ideal for high power listening levels.
As with all high quality car audio products, we recommend professional installation by an
authorised Hifonics dealer. Your dealers knowledge and experience can ensure a problem
free and cosmetically integrated installation. If you choose to install the subwoofers yourself,
please read the entire manual very carefully.
OLM800D2 / OLM800D4:
One-Piece Pressed Paper Cone/Dustcap
High Roll Santoprene Rubber Surround
Reinforced Cone-Neck Joint
Optimally Spaced Dual Spider Design
Ultra Ridged Aluminum Die Cast Basket
w/Polished Grey Finish
Nickel Plated Push & Insert Speaker Terminals
2.5” High-Temp Voice Coil on an Aluminum Former
85oz High Energy Magnet
Heat Dispersing Ported Back Plate
OLM1600D2:
One-Piece Pressed Paper Cone/Dustcap
Uniquely Designed Foam Surround
Reinforced Cone-Neck Joint
Optimally Spaced Dual Spider Design
Ultra Ridged Aluminum Die Cast Basket
w/Polished Grey Finish
Nickel Plated Push & Insert Speaker Terminals
3” High-Temp Voice Coil on an Aluminum Former
182oz High Energy Magnet
Heat Dispersing Ported Back Plate
SUBWOOFER INSTALLATION AND WIRING 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.
Wiring
Wiring Parallel, Series or Parallel/Series will affect the final
impedance at the amp and great care must taken to ensure the
amp is not driven below it’s intended impedance capabilities.
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
Glossary of Terms
+
+
-
-
+
+
-
-
+
+
-
-
+
+
-
-
OLM800D2 / OLM1600D2
DVC 2-Ohms
SERIES COILS / PARALLEL SUBS
2-Ohms
+
-
PARALLEL COILS / PARALLEL SUBS
+
-
.5-Ohms
SERIES
PARALLEL
+
-
1-Ohm
+
-
4-Ohms
++
++
--
--
+
+
-
-
+
+
-
-
+
+
-
-
+
+
-
-
OLM800D4
DVC 4-Ohms
SERIES COILS / PARALLEL SUBS
4-Ohms
+
-
PARALLEL COILS / PARALLEL SUBS
+
-
1-Ohm
SERIES
PARALLEL
+
-
2-Ohms
+
-
8-Ohms
++
++
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14
MT Olympus Series Subwoofer Dimensions
A B C
Outside Diameter Mounting Depth Cutout Diameter
MODEL
OLM800D2 12.64” 6.03” 10.77”
OLM800D4 12.64” 6.03” 10.77”
OLM1600D2 12.64” 6.82” 10.77”
NOTE: There must be atleast 2” of clearance from the back of the
subwoofer to the enclousre.
A
B
C
HIFONICS UNIVERSAL SUBWOOFERS
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