Audio System AU 500.1 Car Amplifier
225,00 €
Audio System AU 500.1 is a single-channel car amplifier designed for a subwoofer system. It operates with loads of no less than 1 ohm and delivers 500 W RMS at 14.4 V into 1 ohm. Its high-level input and audio-signal-triggered automatic switch-on simplify integration with a factory head unit. Adjustable filters allow the reproduced frequency range to be matched to the connected subwoofer.
Audio System AU 500.1 is a single-channel car audio amplifier designed for a vehicle subwoofer system. It can operate with loads of no less than 1 ohm and features adjustable frequency filters. The high-level input helps integrate it with the vehicle’s factory head unit.
Power and Load Selection
The power ratings are stated as RMS values at a 14.4 V supply voltage. Amplifiers should therefore be compared only using figures measured under the same conditions.
As load impedance decreases, the amplifier can deliver more power. Before connecting multiple voice coils or speakers, calculate their total impedance. It must not fall below the amplifier’s permitted minimum load.
Signal Connection
The amplifier has a high-level input. Use it when the vehicle’s factory head unit does not provide a separate low-level signal output. The amplifier can switch on automatically when it detects an audio signal at the input.
The signal is received through a dual differential input with the G.R.I.P.S. system. Input sensitivity can be adjusted from 0.2 to 5 V RMS, allowing the amplifier to work with different source signal levels.
The sensitivity control is not a volume control. Begin with lower sensitivity and increase it gradually. Stop when you achieve sufficient output without audible distortion.
Adjusting the Frequency Filters
The low-pass filter is adjustable from 45 to 255 Hz. Choose an initial setting according to the frequency range reproduced by the connected speaker, then assess the result from the driver’s seat.
If the bass overlaps too much with the vehicle’s other speakers, lower the filter frequency. If you hear a gap between frequency bands, increase it carefully.
The subsonic filter is adjustable from 15 to 55 Hz. It limits the lowest frequencies. Raise the setting only as much as necessary to reduce unwanted ultra-low-frequency reproduction.
Bass boost is adjustable from 0 to +12 dB at 45 Hz. Begin adjustment at 0 dB. Increasing the boost places greater demands on both the amplifier and the connected speaker.
Both filters have a 12 dB-per-octave slope. Protection operation is managed by an independent circuit.
Choosing an Installation Location
Allow additional room around the 195 × 59 × 232 mm housing for connectors, cable bends, and airflow. Do not cover the amplifier with carpet trim. Secure the 2.85 kg unit firmly to a stable surface.
The amplifier is made in Italy. Choose an installation position that keeps the filter and sensitivity controls accessible during the system’s initial setup.
Technical Specifications
| Type | Single-channel car audio amplifier |
|---|---|
| Power at 4 ohms | 1 × 200 W RMS, 14.4 V |
| Power at 2 ohms | 1 × 350 W RMS, 14.4 V |
| Power at 1 ohm | 1 × 500 W RMS, 14.4 V |
| Minimum load impedance | 1 ohm |
| Frequency range | 5-300 Hz |
| Subsonic filter | Adjustable, 15-55 Hz |
| Low-pass filter | Adjustable, 45-255 Hz |
| Filter slope | 12 dB per octave |
| Bass boost | 0-12 dB at 45 Hz |
| Input sensitivity | 0.2-5 V RMS |
| Signal inputs | High-level and dual differential input with G.R.I.P.S. system |
| Automatic switch-on | Triggered by detected audio signal |
| Crossover adjustment | Separate frequency controls for the subsonic and low-pass filters |
| Protection | Managed by an independent circuit |
| Dimensions | 195 × 59 × 232 mm |
| Weight | 2.85 kg |
| Country of manufacture | Italy |
FAQ
Can I connect multiple subwoofers?
Yes, provided that the final combined load impedance is no lower than 1 ohm. When calculating the load, account for whether the voice coils are connected in series or parallel.
When should I use the high-level input?
Use it with a head unit that sends its signal through speaker outputs. Signal detection can activate the amplifier’s automatic switch-on function.
How should I begin adjusting the filters?
Set the low-pass filter first, then adjust the subsonic filter. Evaluate every change from your normal listening position.
Does bass boost replace sensitivity adjustment?
No. Sensitivity matches the amplifier to the source signal level, while bass boost emphasizes a narrower frequency region at 45 Hz.
What should I allow for when installing the amplifier?
Leave room for connectors, cable bends, and airflow. Fasten the housing securely so that it cannot move while the vehicle is being driven.
