Design Features

•Uncompromising Design and Construction including mil-spec glass epoxy circuit boards and high current custom gold-plated solid brass connections that will accept up to 4 gauge power/ground wire.

•Auto High CurrentTM - Soundstream’s exclusive circuit which automatically customizes your amplifier to its particular application-High Current, low impedance loads (multiple subwoofers. less than 2 ohms mono) or High Power, higher impedance loads (2 ohms mono and up).

•Coherent StereoTMIMixed Mono selection for either “pure” stereo operation or mixed mono for simultaneous stereo and mono.

•ChassisinkTM Darlington Power Array Soundstream’s “overbuilding” of the output section incorporates multiple output transistors instead of a few for faster, stronger power delivery. The transistors are sandwiched between the circuit board and the heatsink in a design called ChassisinkTM to ensure cool, efficient amplifier operation.

•PowerGridTM Power Supply Design - All power supply components are located near one another, connected by thick, wide PCB traces, which ensures rapid, high current delivery The entire power supply is isolated on one side of the circuit board while the audio stage is located opposite it, guaranteeing minimal noise.

. Ultra-Low ESR Capacitance Bank Multiple small input power capacitors are used to provide lower ESR (Equivalent Series Resistance), which means more power in and out fasfer.

9 Smart Thermal RollbackTM - Most amplifiers shut off when they get too hot. In the unlikely event the REFERENCE amplifier reaches 85” C, it will gradually roll back its average power (without affecting the dynamics). Once the amplifier has cooled off, it returns to full power output. If overheating should continue, a second thermal sensing protection circuit will shut off the amplifier if the heatsink reaches 95” C.

•Fault Monitor LED on the top panel notifies you of blown power supply fuses.

. l/2 ohm Drive Ability - (Reference644s only) The REFERENCE6445 amplifier is designed to drive virtually any load-all the way down to l/2 ohm stereo (1 ohm mono).

-1 ohm Drive Ability - (Reference414s only) The REFERENCE414s amplifier is designed to drive virtually any load--all the way down to 1 ohm stereo (Zohm mono).

. Dual Discrete Class A Drive Stages -Over 12 times the drive current of most amplifiers, which maintains performance into low impedance loads.

. Drive Delay TM Muted Turn-on/off Circuit - A unique circuit which completely eliminates any amplifier-related turn-on/off noises.

. Flexible Dual Input Level Sensitivity (Reference644s only) accepts 2 voltage ranges; from 200 mV to 2.0 V and from 500 mV to 5.0 V. permitbng maximum output from the amplifier with virtually any source unit. The Reference414s has a single input range, varying from 200 mV to 5.0 V.

. Differential Balanced Input Design for added immunity to noise caused by component and vehicle electrical system interaction when using unbalanced RCA inputs.

. True Balanced Input (Reference644s only) for professional-quality performance and noise cancellation. The 6-pin DIN plug carries (+) and (-) signal information for left and right channels, audio ground, and f15 Vdc to operate the Soundstream BLT” or BLT4TM Balanced Line Transmitters.

. A/RBASSTM Upgradable - This feature allows RF remote control level adjustment while the low pass filter on the amplifier’s internal crossover is being used.

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.