.( INSTALLATION STEP 5 L

LEVEL SETTING

The input levels are adjusted by means of the individual channel input level controls located on the front of the amplifier. This is a unique dual-stage circuit that adjusts both level and gain. This topology maintains better Signal-to-Noise ratios even when using sources with minimal output.

In the ideal situation, all components in the audio system reach maximum undistorted output at the same time. The reason is because an amplifier will only make what comes into it bigger. So, if you send it a distorted signal from the head unit, the amplifier is going to amplify distorted information. The same thing holds true if an outboard processor or crossover begins to distort before you have maximum output from the amplifier. By setting all components to reach clipping at the same time, you can maximize the output of your system. For the REFERENCE amplifiers, follow the steps below for the quickest, easiest means of setting the levels.

Level Setting the Reference414s

1.Turn the amp’s input levels to minimum position (fully counter-clockwise).

2.Set source unit volume to approximately 3/4 of full volume.

3.While playing dynamic source material, slowly increase the amplifier’s input level until a near maximum undistorted level is heard in the system.

4.Continue to adjust the gains independently in order to adjust the desired balance between satellite speakers and subwoofers.

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NOTE: Even though the S/N ratio with low output sources is better with the REFERENCE414s amplifier than others, your best combination of output level and Signal - to - Noise ratio will be achieved when the input levels are set between 1.0 V and 5.0 V.

Level Setting the Reference644s

1.Turn the amp’s input levels to minimum position (fully counter-dockwise). If any channel is in low pass mode, set the subwoofer level pot to the 0 dB position (12 o’clock).

2.Begin with the input level switches in the 0.5 5.0 Volt position.

3.Set source unit volume to approximately 3/4 of full volume.

4.While playing dynamic source material, slowly increase the amplifier’s input levels until a near maximum undistorted level is heard in the system.

5.If you can’t get enough gain out of the amplifier, set the input level switch to the 0.2 2.0 Volt position, and repeat steps 3 and 4.

6.If any channel is in low pas mode, you may have to adjust the subwoofer level control pot to achieve a good balance between satellites and subwoofers.

If your preamplifier / source unit has an extremely high output level, be sure to pay attention to the clipping indicators located on the top of the amplifier. These indicators will notify you if you are clipping the PREAMPLlFlER stage of the amplifier. If the amplifier’s output is distorted and the clipping lights are not blinking, you are most likely clipping the OUTPUTS of the amplifier, or driving the speaker to distortion.

There is an additional control for subwoofer level adjustment on the Reference644s. The purpose of this control is to provide additional range of adjustment for the subwoofer signal in relation to the high pass signal. This control adjusts the level of any channels or RCA signal outputs in low pass mode.

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Soundstream Technologies 414s, 644s owner manual Installation L, Level Setting
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414s, 644s specifications

Soundstream Technologies has made significant waves in the automotive audio industry with its innovative products, especially the 644s and 414s models. These two amplifiers are designed for audiophiles seeking high-quality sound and reliability in their car audio systems.

The Soundstream Technologies 644s is a 4-channel amplifier that delivers clean, powerful sound with a peak power output of 400 watts, making it ideal for driving a full range of speakers. It features a Class A/B design, which ensures high efficiency and minimal distortion, resulting in an impressive audio experience. This amplifier is equipped with adjustable crossovers, allowing users to customize the sound to fit their preferences and ensure optimal performance for both highs and lows. Additionally, the 644s has a built-in bass boost feature, enhancing low-end frequencies for those who appreciate deep, resonating bass in their music.

On the other hand, the Soundstream Technologies 414s is a robust 2-channel amplifier that outputs up to 300 watts of peak power. Like the 644s, the 414s also employs Class A/B technology, which contributes to its impressive sound dynamics and low distortion levels. This model is designed for users looking to power two speakers or a single subwoofer, providing clear and reliable audio output. The 414s features a variable gain control, which helps users balance the sound levels according to their preferences.

Both models boast a sleek design with an aircraft-grade aluminum chassis that not only enhances their durability but also contributes to effective heat dissipation, ensuring long-lasting performance. The built-in protection circuitry prevents overheating and short-circuiting, protecting both the amplifier and the audio components connected to it.

Additionally, both the 644s and 414s incorporate professional-grade connectors and wire terminals that ensure secure, low-resistance connections. This attention to detail in design and technology makes them a reliable choice for serious audio enthusiasts.

In summary, the Soundstream Technologies 644s and 414s amplifiers embody the company’s commitment to delivering high-quality audio solutions. With their feature-rich designs, effective sound customization options, and robust build quality, these amplifiers remain a popular choice among car audio aficionados looking for exceptional sound performance on the road.
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