Interfire Audio A500.4 User Manual
It is important to have good quality power and ground connections. Remember, to complete
an electrical circuit, the ground connection is just as important as the positive power
connection. Before any power connections are made, disconnect the ground cable at the
an electrical circuit, the ground connection is just as important as the positive power
connection. Before any power connections are made, disconnect the ground cable at the
When the power supply lead, memory backup lead or ground lead are extended use a 5mm²
(AWG5) or larger automotive grade cable which will withstand friction and heat to safe
(AWG5) or larger automotive grade cable which will withstand friction and heat to safe
GND = Connect the proper gauge ground wire to the amplifier "GND" terminal. Locate the
position on the chassis of the car to which the amplifier is to be grounded. The surface must
be free from any paint or dirt. This can be accomplished with a small grinding bit, sand
paper or wire wheel. NOTE: Do not ground the amplifier to the "frame of the car. The frame
on most cars and trucks is not grounded to the chassis(body). Use Solder or a clamp ring to
connect the ground wire. Pre-drill the prepped chassis to bolt the ground ring terminal with
nut, bolt and lock washers. Insulate metal and connector with paint or silicon to prevent
rust and oxidation. Silicon also works great to prevent nuts and bolts from working loose in
a harsh environment of an automobile. Upon completion of the ground connection, grab
wire or connector and confirm that it is a solid connection. To prevent engine noise, it is
position on the chassis of the car to which the amplifier is to be grounded. The surface must
be free from any paint or dirt. This can be accomplished with a small grinding bit, sand
paper or wire wheel. NOTE: Do not ground the amplifier to the "frame of the car. The frame
on most cars and trucks is not grounded to the chassis(body). Use Solder or a clamp ring to
connect the ground wire. Pre-drill the prepped chassis to bolt the ground ring terminal with
nut, bolt and lock washers. Insulate metal and connector with paint or silicon to prevent
rust and oxidation. Silicon also works great to prevent nuts and bolts from working loose in
a harsh environment of an automobile. Upon completion of the ground connection, grab
wire or connector and confirm that it is a solid connection. To prevent engine noise, it is
REM = Connect the remote wire (power antenna output) from the head unit to the remote
turn-on wire of the amplifier. If the head unit is not equipped with a remote/antenna output,
locate a wire that is controlled by the accessory position of the key. It is important to have
the amplifier turn off with the radio or key. If the amplifier remains on, the result will most
turn-on wire of the amplifier. If the head unit is not equipped with a remote/antenna output,
locate a wire that is controlled by the accessory position of the key. It is important to have
the amplifier turn off with the radio or key. If the amplifier remains on, the result will most
12V = Connect the proper gauge power wire to the amplifier "B+" terminal. Run wire to
wards the fuse holder that is no greater then 0.5 meters from the battery. Remember, the
fuse is to protect the safety of the car in the case of a short. Connect fuse holder to battery,
wards the fuse holder that is no greater then 0.5 meters from the battery. Remember, the
fuse is to protect the safety of the car in the case of a short. Connect fuse holder to battery,
4
This amplifier will accept low level inputs only. Low level is the same as line level. The low
level signal is carried through RCA cables. It is preferred to use low level inputs to the amplifier
if the head unit is equipped with the low level outputs. If not, you can use a "high to low
level signal is carried through RCA cables. It is preferred to use low level inputs to the amplifier
if the head unit is equipped with the low level outputs. If not, you can use a "high to low
Connect the low level/line level RCA cables from the head unit, or signal processor, to the
converter" available through your local car audio shop.
line level input on the amplifier. See Fig.2 system wiring diagrams.
battery.
grade against fires occurring as a result of short-circuiting.
recommended to ground the head unit and other audio electronics in the same location.
likely be a dead battery.
but do not install fuse at this time.