STEG QM500.1 Mono Car Audio Amplifier
235,00 €
The STEG QM500.1 is a Class A/B mono car audio amplifier designed for a bass channel. It delivers up to 500 W RMS with a 1-ohm load and a 14.4 V supply. High-level inputs and automatic turn-on simplify connection to a factory audio system. Adjustable filters allow the reproduced bass range to be tuned.
The STEG QM500.1 amplifier is a Class A/B mono car audio amplifier designed to power a bass channel. It delivers 500 W RMS with a 14.4 V supply and a 1-ohm load. High-level inputs make it easier to integrate the amplifier into a factory-installed car audio system.
Purpose and power selection
This mono amplifier is intended for a single-channel bass system. It delivers 200 W RMS at 4 ohms and 350 W RMS at 2 ohms. With a 1-ohm load, the output increases to 500 W RMS.
When choosing a subwoofer, consider the total impedance produced by its voice coils and wiring configuration. This model can operate with a 1-, 2-, or 4-ohm mono load. A lower impedance allows the amplifier to deliver more power, but it also places a greater load on the vehicle’s electrical system.
RMS power and maximum power are not the same measurement. RMS figures are more useful when matching the continuous power capability of a system. Maximum power describes the short-term output limit. All stated power figures were measured with a 14.4 V supply voltage.
Connecting to the audio system
High-level inputs accept a speaker-level signal. This is useful when the factory head unit does not have line-level outputs. The input sensitivity range extends from 200 mV to 6 V RMS.
Automatic turn-on detects the audio signal and activates the amplifier. This feature simplifies integration in systems where installing a separate remote turn-on connection would be inconvenient.
The signal path uses a dual differential input with the G.R.I.P.S. system. The output stage incorporates Audiophile Final Stage Technology. Protection functions are controlled by a circuit that is independent of the main audio path.
Adjusting the filters
The adjustable low-pass filter operates from 45 to 255 Hz with a 12 dB slope. A setting of approximately 80 Hz can be used as a starting point. If the bass can be located too clearly at the rear of the vehicle, lower the cutoff frequency.
The subsonic filter is adjustable from 15 to 55 Hz and also has a 12 dB slope. A higher setting applies greater restriction to very low-frequency signals. Adjust this filter according to the construction of the subwoofer enclosure and the music you listen to.
Bass boost can be adjusted from 0 to +12 dB. Begin at 0 dB and increase it in small steps. Evaluate the result from the driver’s seat, and avoid changing several settings at the same time.
Installation location
The enclosure measures 264 × 56 × 184 mm and weighs 3.21 kg. Before installation, measure more than the intended mounting recess alone. Additional room will also be needed for the connectors and cable bends.
Secure the amplifier to a stable surface and leave an air gap around its enclosure. The controls should remain accessible for the initial adjustment of the filters and input sensitivity. This model is made in Italy.
Technical specifications
| Model | STEG QM500.1 |
|---|---|
| Type | Class A/B mono car audio amplifier |
| RMS power at 4 ohms | 1 × 200 W at 14.4 V |
| RMS power at 2 ohms | 1 × 350 W at 14.4 V |
| RMS power at 1 ohm | 1 × 500 W at 14.4 V |
| Maximum power at 4 ohms | 1 × 450 W at 14.4 V |
| Maximum power at 2 ohms | 1 × 600 W at 14.4 V |
| Maximum power at 1 ohm | 1 × 700 W at 14.4 V |
| Input sensitivity | 200 mV-6 V RMS |
| Low-pass filter | 45-255 Hz, 12 dB |
| Subsonic filter | 15-55 Hz, 12 dB |
| Bass boost | 0 to +12 dB |
| Inputs | High-level inputs; dual differential input with G.R.I.P.S. system |
| Automatic turn-on | Activated by a detected audio signal |
| Frequency crossover | Dual adjustment technology |
| Output stage | Audiophile Final Stage Technology |
| Protection control | Independent circuit |
| Dimensions | 264 × 56 × 184 mm |
| Weight | 3.21 kg |
| Country of manufacture | Italy |
FAQ
Can the amplifier operate with a 1-ohm load?
Yes. At 1 ohm and 14.4 V, the specified output is 500 W RMS. Consider the total impedance of all connected voice coils.
Can it be connected to a factory car stereo?
Yes, provided that a speaker-level signal is available. The high-level inputs are intended for this purpose. The audio signal can also activate the automatic turn-on function.
What filter settings should I start with?
Start by setting the low-pass filter to approximately 80 Hz. Leave the bass boost at 0 dB. Then adjust each control separately.
How should I choose a suitable installation location?
Allow room for the 264 × 56 × 184 mm enclosure, its connectors, and the cable bends. Leave an air gap around the amplifier and retain access to the controls.
Which power figure matters most when choosing a subwoofer?
When matching a subwoofer’s power handling, start with the RMS rating at the selected impedance. The maximum power figure describes a short-term output limit rather than continuous output.
