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• Use damping materials, like AZ audiocomp FONOMAT, onto internal walls in order
to eliminate vibrations.
• When building a reflex box, please note that the closer the port is to internal
panels, the longer it virtually seems lowering frequency; thus, if you place the port
next to a corner, make it 30% shorter approximately.
• Avoid to put the box rear panel close to the speaker bottom plate. Place it at least
5 cm far from it not to affect the correct functioning of the speaker rear vented hole.
(see page Installation Patterns - Distance from bottom)
• Build your box of rigid, anti-vibration material not to compromise the project
acoustic performances: use high-density wood, MDF, multilayer sea wood, etc.
• Employ some sound-proof materials like AZ audiocomp FONOFORM to cover the
box internal walls, considering that this operation virtually increases internal volume
of around 10%. This is useful since it permits to limit the box size.
• After finishing your reflex box, please test it into your car compartment by changing
the port length and, thus, frequency, or the quantity of sound-proof material in the
enclosure. This is the only way to be sure you get the acoustic results you want.
By making the port shorter or decreasing the quantity of sound-proof material, you
increase frequency and get clearer, crisper bass; vice versa, bass will be deeper but
less sharp.
Choosing your cable (see page: Choosing your cable)
Power cables are extremely important since they directly affect the system damping
factor; in the enclosed table, we show cable diameters, which we recommend
according to length and applied power.
Tuning
After finishing your box or installing it in your car, you need to spend some time
to tune your system and calibrate your amplifier:
• The amplifier gain level should be adjusted in order to keep power in a linear
functioning area, without distorsions or saturation that might damage the speaker.
• Cut-off frequency should be between 80 and 50 Hz, according to the configuration
you use (direct emission like Reflex Box and Free Air or indirect emission like
Asymmetric Bandpass or Double Reflex).
• If possible, use subsonic filter by setting its cut-off frequency around 25 Hz.
• Avoid to use loudness or equalisers at low frequencies (<150 Hz): MILLE
subwoofers have full, flat response and don’t need any corrections, that might
cause the amplifier saturation or distorsion.
• The subwoofer connection phase determines acoustic results and needs to
be tested by being listened to. It might be necessary to invert it according to
configuration, main speakers and other electronic devices in the system.
Make some listening tests in both ways and choose the solution you prefer.
(see page Installation Patterns - Electric connections).
• It is extremely difficult to know in advance the results you will get in your car
compartment; let us remind you that you can adjust your bass also by changing
the subwoofer position inside your car. Before designing the complete structure
of your trunk, make some tests by moving the box and the port and speaker
emitting direction. (see page Installation Patterns - Placement).
Warning
• In order to avoid possible damages, keep all components in their package until
you install them.
• Always wear protective eyewear when using tools that may generate splinters.
• Before you start your installation, turn off the head unit, the amplifier if you have
one, and all electrical devices in your audio system, in order to prevent any
damages.
• Make sure the location you chose for your speakers doesn’t hinder the correct
functioning of all mechanical or electric devices in your car.
• Don’t put cables close to electronic gearcases.
• Use extreme caution when cutting or drilling the car plate, verifying there are no
electrical wiring or structural elements underneath.
• Protect conductor with a rubber ring if wires pass through a hole in the plate or
with proper materials if they pass close to heat-generating parts.
• Firmly fix the boxes or the subwoofer to the vehicle chassis in a reliable way
through brackets, screws, nuts and bolts, in order to insure safety while driving.
Warranty restrictions
Please carefully read warranty terms and keep both the manual and the original box.
HERTZ has restricted warranty, according to the terms written below:
Warranty duration: 2 years
Subject: This warranty is valid only for HERTZ products sold by HERTZ authorised
dealers.
Object: Products found to be defective during the warranty period will be repaired or
replaced with an equivalent product at HERTZ’s discretion.
Warranty is void:
1. For damages caused by accidents, abuse, improper operation, water, theft.
2. If after sale service is performed by anyone other than HERTZ authorised service
centers.
3. If serial number has been spoiled, altered or removed from the product.
4. For damages caused by overdriving or excessive distorsion due to non-linear
functioning of power supply and excessive distorsion.
HERTZ accepts no liabilities for possible damages that result from disregarding what
is written in this manual.
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