NHT owner manual „ Dual Subwoofer Connection Method, „ The SA-2 and Biamplification

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„Multiple Subwoofer Configurations: Using two SW2Si subwoofers

While the addition of a powered subwoofer system results in significant improvements to an audio or home theater system, there are some potential drawbacks to the use of a single subwoofer in certain rooms. A single subwoofer tends to excite the resonant frequen- cies of a room, inevitably causing peaks and dips in the room response within a certain range of low frequencies.

To help counteract some inherent low frequency colorations, it can be advantageous to employ multiple subwoofers placed assymetri- cally in the room. When two subwoofers are used together and are set up properly with respect to phase and level, they tend to smooth out peaks and dips, for a flatter overall low frequency response, increased articulation and clarity.

The SA-2 was designed with sufficient high current capability to drive two SW2Si subwoofers. Adding a second SW2Si decreases the impedance load, which increases the SA-2’s power output to 165 watts.

„Dual Subwoofer Connection Method

To run two SW2Si subwoofers from a single SA-2 ampli- fier, the two subwoofers are wired in parallel.

1) Using two similar lengths of speaker cable, connect the positive (red) conductors of both cables to the positive (red) SUBWOOFER OUTPUT terminal on the SA-2, and both negative (black) conductors to the nega- tive (black) SUBWOOFER OUTPUT terminal on the SA- 2.

2) Connect one speaker cable to the first subwoofer (positive conductor to positive terminal, negative conductor to negative terminal).

3) Connect the second speaker cable to the second subwoofer, wired in the same fashion.

„The SA-2 and Biamplification

All NHT tower loudspeakers are designed with dual sets of binding posts to allow for biamplification. Biamplification is the use of two sep- arate amplifiers, one to power the low frequency (subwoofer) drivers and one to power the upper frequency (midrange / tweeter) drivers.

The advantages of biamplification include reduced distortion, increased dynamic range and power output. Since both amplifiers are spared the task of reproducing the entire frequency range, both are able to concentrate all their headroom toward a specific frequency range. In the event that the speakers are driven to elevated listening levels, the subwoofer amplifier may clip first, but this distortion will be isolated from the upper frequency ranges because they are amplified separately.

Biamplifying tower speakers with the SA-2 results in added benefits, as it transforms their built-in subwoofer sections into fully adjustable powered subwoofers. Using the SA-2’s onboard bass tuning functions, the user can fine-tune a tower loudspeaker’s bass response in a specific listening environment. For example, if the speakers are used in a room that tends to under-emphasize or over-emphasize low frequencies, it is possible to increase or decrease the volume level of the subwoofer sections independently of the upper driver sections. Additionally, the SA-2’s low-pass crossover allows the user to adjust the rolloff of low frequencies to the subwoofer sections of the speak- ers, for further fine-tuning of low- to mid-bass frequencies.

Towers may be biamplified monaurally using a single SA-2 and a full-range main (stereo) amplifier, or biamplified in stereo using two SA-2’s and a main amplifier. Additionally, the towers may be biamplified either in series or in parallel. Wired in series (Method #1), the main amplifier receives a filtered line-level signal via the high-pass output from the SA-2. Wired in parallel (Method #2), both the main amplifier and the SA-2 receive full-range signals directly from the preamplifier. The main amplifier may be a stand-alone stereo unit, dual monoblocks, or the amplifier section of an integrated amplifier or A/V receiver that features “Pre-Out” and “Main-In” jacks. The SA- 2 may be used to successfully biamplify NHT Models 2.5i and VT-1.2.

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Contents Now Hear This SA-2Important Safety Instructions Table of Contents „ Placement · Weight 15 lbs· Frequency Response 25Hz 150Hz +/-3dB „ DesignFront and Back Panel Diagram „ Low-Pass Filter Subwoofer Fc „ General Connections„ High-Pass Filter Satellite Fc Connection Method #2 Only „ Subwoofer Volume Control „ The SA-2 and SW2Si The SW2Pi Powered Subwoofer SystemUse if 2 P i C o n n e c t i o n M e t h o d #SW2Pi Connection Method #2 SW2Pi Connection Method #3 SW2Pi Connection Method #4 „ Fine Tuning the Subwoofer Solution„ The SA-2 and Biamplification „ Dual Subwoofer Connection MethodBiamplification Method #1 A m p l i f i c a t i o n M e t h o d # Biamplification Method #3 „ Biamplification Bass Tuning Methods „ Recommended biamplification settings„ Maintenance „ Changing the Line Voltage Setting„ Glossary of Terms „ TroubleshootingWarranty

SA-2 specifications

The NHT SA-2 is a remarkable achievement in the world of audio engineering, representing a synthesis of innovative design, advanced technology, and exceptional acoustic performance. Launched by NHT (Next High Technology), a company renowned for its commitment to high-fidelity audio reproduction, the SA-2 stands out for both its aesthetic appeal and high-performance specifications.

One of the standout features of the NHT SA-2 is its compact design, making it suitable for a variety of listening environments. This speaker is engineered to deliver a full-range sound experience despite its smaller footprint. The SA-2 utilizes a proprietary 5.25-inch woofer that is designed to produce deep and rich bass tones, complemented by a 1-inch silk dome tweeter that excels in handling high frequencies. This combination allows the SA-2 to reproduce a broad dynamic range, ensuring that listeners can experience their music with clarity and detail.

In terms of technology, the NHT SA-2 leverages advanced materials and construction techniques to enhance performance. The woofer cone is formed from a specially engineered composite material that offers both rigidity and lightweight properties. This helps to minimize distortion and ensures that sound waves are produced accurately. Additionally, the tweeter's silk dome design contributes to a smooth frequency response, reducing harshness and delivering a more natural sound.

Another noteworthy characteristic of the NHT SA-2 is its versatility. It is designed for both two-channel stereo setups and can easily integrate into multi-channel home theater systems. The speaker can be used in various configurations, whether as part of a dedicated music listening space or in a surround sound setup, making it a flexible choice for audiophiles and casual listeners alike.

The SA-2 also benefits from thoughtful engineering. Its rear-firing port enhances bass response, allowing for greater low-frequency extension without requiring excessive cabinet size. This design choice enables it to adapt well in different room environments, further enhancing its usability.

Overall, the NHT SA-2 embodies the core principles of high-quality audio reproduction. With its advanced construction, thoughtful engineering, and versatile application, it is an excellent choice for anyone looking to elevate their listening experience. Whether used for music, movies, or gaming, the NHT SA-2 promises a captivating and immersive sound that delights the senses.
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