• / INSTALLATION STEP 6 k

CROSSOVER ADJUSTMENTS

The REFERENCE644s and REFERENCE414s amplifiers incorporate an on- board staggered electronic crossover. They also have RCA outputs to drive an external amplifier. No external electronic crossover is necessary. The high and low pass portions of the crossover can be set independently of one another.

In most car audio installations, there is a tendency for a “midbass boom.” Because of their interior dimensions, most cars will resonate or ring at these midbass frequencies. If we design the system so there is less musical information in this region, the final response is very smooth and natural sounding. The high pass filter is variable from 60 to 240 Hz at 12 dB/octave, while the low pass filter is variable from 30 to 120 Hz at 24 dB/octave.

For initial crossover setup, try setting the low pass filter to approximately 60 Hz, and the high pass filter(s) to approximately 100 Hz. Change the cro~swer points to accommodate a good mixture of frequency response, power handling. and personal preference.

full range is detived from ~ When the RCA sianal outout is ~

summed from Channels I, 2; j the REFERENCE644s also !

AIRBASSTM ACCESSORY OPT/ON

Soundstream’s newA/RBASSTY feature can be added to the REFERENCE6445

&REFERENCE414s amplifiers. This feature allows wireless RF remote conlrol level adjustment of the amplifier, while the low pass filter on the amplifier’s internal crossover is engaged. (AIRBASS TM does not control the level of the

RCA signal outputs.)

111

~

NOTE: The A/RBASSTM accessory ;s intended to be used only while the REFERENCE amplifiers are diving a subwoofer( When the AIRBASSTH accessory is added to a REFERENCE414.s a n d REFERENCE644q it controls the level of any channel receiving informabon from the low pass filter in the amplifier. The Coherent StereoTM / Mixed Mono / Bridged Mono switches still function as nomlal.

Installing AiRBASS TM involves removing the bottom plate of the amplifier. adding the AIRBASSTM circuit board, and flipping a switch. The switch is labeled on the amplifier’s main circuit board. DO NOT set the AIRBASSTM switch to the “IN” position unless theAIRBASSTM module has been added. DO NOT move the A/RBASSTM switch while the amplifier is “ON”. Doing so may damage your speakers. (Please refer to the AIRBASS”* owner’s I installation manual for more details.)

18

19

Page 9 Page 11
Page 10
Image 10
Soundstream Technologies 644s, 414s owner manual Crossover Adjustments, Airbasstm Accessory OPT/ON
Page 9 Page 11

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.
Top Page Image Contents