Auto High Currenttm Power Supply

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The REFERENCE amplifier employs an extremely efficient Auto High CorrwP power supply (patent pending). This power supply circuitry automatically customizes your amplifier for optimum efficiency and power output into virtually any impedance load. When other brand amplifiers are driven at low impedances (i.e., 1 ohm or less). they shut down, squash dynamics and power output (called current limiting). or waste huge amounts of power (i.e., low efficiency). All of which reduce the “real world” power the amplifier can produce in the car. Soundstream’s Auto H;gh CurrentT” power supply allows the REFERENCE amplifiers to be one of two types of amps: either producing maximum power at higher impedances (perfect for satellites) or at lower impedances (usually with multiple subwoofers). This is done by letting the amplifier’s power supply continuously monitor the impedance of the load the amplifier is driving. If the impedance drops too low, the power supply will automatically switch into High Current mode. It will stay in this mode until the amplifier is turned off. The next time it is powered up, it will be in the High Power mode.

Unlike other amplifiers, Soundstream’s REFERENCE amplifiers can be configured to drive virtually any impedance and make maximum power! The major advantages of this power supply are:

•awesome dynamic power capabilities

•added continuous power with higher voltages

•increased amplifier efficiency and reliability

Because of the dynamic properties of most music; all audio components should be able to react accordingly. Thanks to their unique power supplies, the REFERENCE amplifiers can comfortably exceed their rated power for dynamic portions of the music.

4 INSTALLATION STEP 1 1.

COHERENT STEREOTM /

MIXED-MONO / BRlDGED MONO

The REFERENCE amplifier has the ability to operate in any one of the following modes:

Coherent SiereOrM with identical left and right stereo channels for maximum fidelity. Best choice for satellite speakers. Use this mode unless Mixed-Mono is necessary.

Mixed-Monoin order to drive stereo and mono simultaneously; works well for center channels. It can be used anytime you need a summed mono channel. Somewhat sacrifices sonic accuracy as additional circuitry is introduced lo one channel. In Mixed-Mono, the left channel is inverted, see diagram below or

on the bottom of the amplifier.

Bridged MOllO for dedicated single channel operation; ideal for driving

subwoofers. It is also used when large amounts of power are necessary for single speakers. In bridged mono, on/vthe right channel inwt is active.

COHERENT STEREO	BRIDGED MONO
+L. _R.	*L- -R+

1~Infocibudged mono, only the right channel input is active.

NOTE: If you intend to dfive a REFERENCE amp in mono but have stereo outputs from your crossover or source unit, you can pot the switch in Mixed-Mono but follow the normal wiring for Bridged Mono.

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.