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 converter" available through your local car audio shop.

Connect the low level/line level RCA cables from the head unit, or signal processor, to the line level input on the amplifier. See Fig.2 system wiring diagrams.

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 battery.

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 grade against fires occurring as a result of short-circuiting.

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 recommended to ground the head unit and other audio electronics in the same location.

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 likely be a dead battery.

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, but do not install fuse at this time.

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Interfire Audio A2200.2, A1000.2, A500.4, A300.2, A700.4, A700.2, A800.5, A1100.2, A500.2, A900.4 instruction manual
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A700.4, A1100.2, A900.4, A500.2, A2200.2 specifications

Interfire Audio has established itself as a reputable brand in the automotive audio industry, with a strong lineup of amplifiers that cater to both audiophiles and casual listeners. Among their most notable offerings are the A500.4, A700.2, A800.5, A1000.2, and A300.2 amplifiers, each designed to deliver superior sound quality and performance.

The A500.4 is a compact 4-channel amplifier that packs a punch. With its efficient Class D circuitry, it delivers 125 watts per channel at 4 ohms, providing ample power for any speaker setup. This amplifier is equipped with built-in low-pass and high-pass filters, allowing users to tailor the audio output to their preference. Its robust construction and thermal management features ensure reliable performance even under demanding conditions.

Next in the lineup is the A700.2, a 2-channel amplifier that is perfect for powering a pair of high-performance speakers. This model offers 350 watts of power at 2 ohms, making it an ideal choice for those looking to achieve clear, dynamic sound. The A700.2 includes advanced circuitry designed to minimize distortion and maximize efficiency, ensuring that every note is delivered with clarity.

For those requiring multi-channel capabilities, the A800.5 is a versatile 5-channel amplifier. Capable of delivering 100 watts to four channels and 300 watts to the sub output, it is designed for full-range sound reproduction. With features such as variable crossovers and gain control, users can customize their audio experience. Its compact design allows for flexible installation options, making it a popular choice among car audio enthusiasts.

The A1000.2 stands out as one of Interfire's most powerful amplifiers, offering an impressive 500 watts per channel at 2 ohms. This powerhouse is perfect for hard-hitting bass and can drive larger subwoofers with ease. The incorporation of high-quality components ensures optimal performance, while advanced thermal protection technology safeguards against overheating during intense use.

Lastly, the A300.2 is an entry-level 2-channel amplifier that doesn’t compromise on quality. Providing 150 watts per channel at 4 ohms, it is an excellent choice for those seeking an upgrade without breaking the bank. Its durable design and user-friendly installation make it an appealing option for beginners looking to enhance their car audio experience.

In summary, Interfire Audio's A500.4, A700.2, A800.5, A1000.2, and A300.2 amplifiers each bring unique features and technologies to the table, making them worthy contenders in the competitive automotive audio market. With an emphasis on power, clarity, and user customization, these amplifiers cater to a wide range of audio needs, ensuring that every listener can find the perfect match for their setup.
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