WOOFER
SPECIFICATION SHEET
The EMPHASER G5 shallow woofer product line has been engineered
with the target in mind, to allow space saving woofer installs without
compromises on either bass output or sound quality.
WOOFER KEY FEATURES
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■ MBR BUTYL RUBBER SURROUND
MBR rubber surrounds are deployed, to guarantee long service life
as well as good micro- and macrodynamics for a true and lifelike
bass performance.
■ HIGH EXCURSION NOMEX™ SPIDER
The spider design of the G5 woofer line was tuned to allow high cone
excursion in ported and bandpass systems, avoiding any kind of
long term parameter shift by the use of black Nomex™ aramide fiber
material. The spider diameter is overspec'd to endure continuous
high power use.
Proprietary Die-Cast Aluminum Basket
ND40 Neodymium Magnet Motor
Injection Moulded PP Cone
MBR Butyl Rubber Surround
High Excursion Nomex™ Spider
Polyimide Voice-Coil Former
4-Layer Wound Aluminum Wire Voice-Coil
CNC Machined Pole Plates
MBR Rubber Front Gasket
Proprietary Push Terminals
■ POLYIMIDE VOICE COIL FORMER
Polyimide voice coil formers are chosen for their non-magnetic and
temperature resistant material properties. Polyimide will not oscillate
under mechanical load and provides an eddy current free magnetic
flux for high Qms and precise sound quality.
■ PROPRIETARY DIE-CAST ALUMINUM BASKET
EMPHASER new G5 shallow basket line combines contradictory
requirements: stable, precise and antiresonant platform providing
mechanical support for all attached parts. The CAD design of this
new basket line integrates ultra shallow mounting depth with large
cone excursion capabilities, while maintaining good airflow and
cooling of parts that encounter high thermal loads and stress during
high power use.
■ ND40 NEODYMIUM MAGNET
One big Neodymium ND40 slug forms the powerful heart of each
G5 shallow woofer. This new magnet motor design is based on FEA
optimized gap geometry, resulting in less stray field as well as higher
magnetic flux – to yield high efficiency and low power compression.
■ INJECTION MOULDED PP CONE
The G5 woofers deploy a cone assembly consisting of three separate
parts that are injection moulded from PP material. The special shape
of the cone results in highest stiffness and low moving mass, providing
lowest possible cone flex at high SPL and precise hard hitting bass
lines.
■ 4-LAYER WOUND ALUMINUM WIRE VOICE COIL
4-layer wound Aluminum wire voice-coils with 2.5 or 3” diameter
provide very high thermal power handling, yet also keep the
moving mass low compared to copper voice coils, to render higher
efficiency.
■ CNC MACHINED POLE PLATES
CNC machined pole plates form tight air-gaps to extract the maximum possible magnetic energy from the magnet motor. When
chrome plated and laser etched like for the G5 woofers, they also
provide that extra look of quality and protection against environmental influences.
■ MBR RUBBER FRONT GASKET
MBR front gasket construction has been chosen and realized to allow
the G5 woofers being mounted traditionally with the magnet facing
inside the cabinet – but also in inverted manner with their cone
side facing against the cabinet – allowing to deal with any kind of
mounting situation.
■ PROPRIETARY PUSH TERMINALS
New push terminals have been designed to accept speaker wires
with large cross section, keeping electrical losses at the wire contact
junction as low as possible.
Technical Specifications
EF08N-G5
EF10N-G5
EF12N-G5
Usable Frequency Response*
30 – 150 Hz
25 – 150 Hz
20 – 150 Hz
Continuous Power Handling*
300 Wrms* 400 Wrms*
500 Wrms*
Peak Power Handling*
500 W*
600 W*
700 W*
Nominal Impedance
4 Ohms
4 Ohms
4 Ohms
Voice Coil Diameter
2 ½” / 63 mm
2 ½” / 63 mm
3“ / 76 mm
Voice Coil Winding Height
19.0 mm
21.5 mm
28.0 mm
Magnetic Gap Height
9.0 mm
9.0 mm
9.0 mm
Total Weight of NdFB Magnet
15.43 oz. / 437 g
19.29 oz. / 547 g
31.40 oz. / 890 g
*Exact performance data depending upon actual enclosure!
Thiele – Small Parameters
EF08N-G5
EF10N-G5
EF12N-G5
Free-Air Resonance
(Fs)
43.0 Hz
35 Hz
31 Hz
DC Resistance
(Re)
4.1 Ohms
4.1 Ohms
3.9 Ohms
Electrical Damping
(Qes)
0.22
0.23
0.25
Mechanical Damping
(Qms)
8.9
6.6
8.0
Total Damping
(Qts)
0.22
0.23
0.24
Equivalent Volume of Compliance
(Vas)
8.9 l
54.2 l
41.7 l
Moving Mass incl. Air Load
(Mms)
96.9 g
129.4 g
209.5 g
Electrically Limited Cone Excursion
(Xmax)
10.0 mm (p-p)
12.5 mm (p-p)
19.0 mm (p-p)
Effective Cone Surface
(Sd)
214 cm²
491 cm²
510 cm²
Volume Displacement of Cone
(Vd)
214 cm³
613 cm³
969 cm³
Voice Coil Inductance @ 1kHz
(Le)
3.4 mH
3.6 mH
2.4 mH
Efficiency @ 2.00V
(RefSPL)
87.4 dB/1W/1m
89,4 dB/1W/1m
89.3 dB/1W/1m
EF08N-G5
EF10N-G5
EF12N-G5
Mounting Cutout Diameter
190 mm
235 mm
286 mm
Rear Mounting Clearance (Mounting Depth)
64 mm
72 mm
77 mm
Mounting Dimensions
Enclosure Suggestions
EMPHASER Laboratories recommend to use the G5 shallow woofers in combination with vented or bandpass enclosures. To obtain the best possible performance of this woofer in your car audio system, make sure to follow the stated basic enclosure suggestions listed below. If the provided
enclosure suggestions are not applicable to your system or vehicle, contact your authorized EMPHASER dealer to ask for further assistance.
EF08N-G5
EF10N-G5
EF12N-G5
Net Volume:
25 l
35 l
56 l
Inner Diameter of Port:
1 x 8 cm
1 x 10 cm
2 x 10 cm
Length of Port:
19 cm
22 cm
23 cm each
Net Volume:
30 l
40 l
65 l
Inner Diameter of Port:
1 x 8 cm
1 x 10 cm
1 x 10 cm
Length of Port:
28 cm
26 cm each
26 cm each
Net Volume Ported Chamber:
23 l
29 l
35 l
Net Volume Sealed Chamber:
15 l
18 l
24 l
Inside Diameter of Ports:
1 x 10 cm
1 x 10 cm
2 x 10 cm
Port Length:
15 cm each
20 cm
23 cm each
Ported Enclosure I (SPL)
Ported Enclosure II (LOW BASS)
Bandpass Enclosure
Enclosure Construction/Cabinet Damping/Break-In Info
➔ Always use at least 19 mm MDF or birch plywood to build the bass enclosure. Make sure all joints are well sealed, since a woofer can only
reach optimum performance when mounted to an airtight cabinet!
➔ The enclosures should be lined with damping material according to their function principle: The sealed enclosure must be filled with polyfill
(bonded acrylic fiber). The inner walls of the ported enclosure should be lined out with egg crate PU-foam. The sealed chamber of the bandpass
enclosure has to be lined with PU-foam, while the ported chamber usually remains free of any damping material.
➔ Loudspeakers that deploy spiders made of Nomex™ aramide fiber material need extra time to break-in! Out of the box, the suspension sytem
of any G5 woofer model is stiff. To achieve optimum bass response, consider at least two weeks of daily playing at elevated playback levels.
After that period of time, the suspension system has reached its equilibrium and will remain stable for the entire life-span of this product.
WARRANTY
EMPHASER Inc. Wyoming, Michigan U.S.A. warrants this woofer
to be free of defects in materials and workmanship for two years
from the original date of purchase at retail, contingent upon installation being performed or approved by an authorized EMPHASER
dealer. EMPHASER Inc. will at its own discretion repair or replace
any mechanically defective woofer at no charge, during the warranty period. This warranty is limited to the original purchaser.
Should your EMPHASER woofer require warranty service, please
return it to the retailer from whom it was purchased. Please do not
send any product to EMPHASER Inc., Wyoming, Michigan U.S.A.
Should you have difficulty in finding an authorized EMPHASER
dealer or service center, details are available from the national
distributor in the country of purchase.
Abuse of this loudspeaker is not covered under warranty.
The warranty does NOT cover:
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Woofers that have been exposed to electrical input exceeding
the rated power handling
Any kind of freight damage
Woofers damaged due to amplifier clipping
Woofers exposed to water, oil, solvents or excessive heat
Repair attempts by unauthorized individuals
Install damage (i.e. screwdriver holes)
EMPHASER Inc. Wyoming, Michigan U.S.A