NHT Essential Guide to Biamplification Methods with the SA-2 Amplifier
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„Recommended biamplification settings:

1)SUBWOOFER PHASE: 0°. If the main amplifier inverts phase, use 180°. If you are unsure about this, select the setting that results in higher bass output with the volume control unchanged.

2)SUBWOOFER VOLUME: Adjust for accuracy, listening for seamless blending between upper and lower frequency ranges. When changing electronics, it may become necessary to re-adjust the SA-2’s volume level, since the correct volume setting depends on the sensitivity of partnering electronics.

3)SATELLITE FC (High-pass filter): 50Hz. THIS SETTING ONLY APPLIES TO BIAMPLIFICATION CONNECTION METHOD #1. IF YOU ARE USING METHOD #2 OR #3, IGNORE THIS SETTING. Set the SA-2’shigh-pass filter to its lowest setting to ensure that the SA-2’shigh-pass filter does not interfere with the tower speaker’s passive crossover. In other words, the SA-2 sends only information

from 50Hz-up to the main amplifier (and consequently the speaker’s upper range drivers. The speaker itself then filters the signal further, according to the low-pass filter designed into its passive crossover.

4)SUBWOOFER FC (Low-pass filter): 150Hz. Set the SA-2’s low-pass filter to its highest setting so that the SA-2’s low-pass filter does not interfere with the tower speaker’s passive crossover. In other words, the SA-2 sends only information below 150Hz to the speak- er’s subwoofer section. The speaker itself then filters the signal further, according to the high-pass filter designed into its passive crossover.

„Biamplification: Bass Tuning Methods

Following are two bass tuning methods that can be employed to further “dial in” a tower speaker’s bass response, using the SA-2’s onboard low-pass filter.

1)If there is excessive mid-bass, lower the SA-2’s low-pass setting (SUBWOOFER Fc) until the mid-bass response is smoothed out. Lowering the SA-2’s low-pass setting allows gradually increased filtering of the bass information before the signal reaches the speak- er’s passive crossover network.

2)If there is not enough low bass output, lower the SA-2’s low-pass setting and increase its volume. This bass tuning method allows the listener to decrease the mid-bass response, but in conjunction with increased output from the subwoofer amplifier. This effectively increases the audibility of low bass information.

3)Experiment with phase.

„Operation

The SA-2 was designed to handle a wide range of listening levels, but every component has limits. It is important to use common sense and listen for signs of possible distress from the subwoofer. Noticeable distortion or harsh breakup is an indication that either the SA-2 or the subwoofer is running beyond its capacity, and the volume should be decreased. If you feel heat emanating from the front of the woofer, reduce the level immediately. Speaker damage most often occurs from sustained high volume levels, not from transient sounds or brief musical peaks. Excessive boosting of bass, treble, or equalizer controls can worsen the problem and is not recommended.

„Maintenance

Your SA-2 subwoofer amplifier has been designed for years of trouble-free operation and required minimal maintenance under normal use. The SA-2 may be cleaned by wiping with a lint-free cloth. Do not expose the SA-2 to direct sunlight, high temperatures or moisture. In the event that service is required, do not open the SA-2. Refer the unit to a qualified service technician.

„Changing the Line Voltage Setting

In the event that it is necessary to change the line voltage setting, begin by turning the power switch to the OFF position. Remove all connections from the subwoofer, including the detachable power cord. Locate the two screws holding the cover plate over the voltage selector switch, and loosen both screws two turns. DO NOT REMOVE THE SCREWS! Rotate the cover plate 45 degrees to gain access to the switch. Using a flat blade screwdriver, slide the switch to the correct position. Use the 115 VAC position for 110 to 120 VAC, and the 230 VAC position for 220 to 240 VAC. Slide the cover plate back into position. Tighten both screws. Next, you will need to replace the fuse (see “Changing the Fuse”).

„Changing the Fuse

Always replace the fuse with one of the exact same specifications. For systems operating in the 115 volt setting, use only 5 x 20 mm, T3A, 250-volt slow-blow fuses. For systems operating in the 230 volt setting, use only 5 x 20 mm, T1.6A, 250-volt slow-blow fuses.

The SA-2 subwoofer amplifier has a user-serviceable fuse. To replace or change the fuse, begin by turning the power to the OFF position and removing the detachable power cord from the amplifier. Next, remove the fuse holder cover from the power cord sock- et with a flat blade screwdriver. Remove the fuse from the holder and replace it with the appropriate type. For 110 to 120 VAC, use a 5mm x 20mm T3A 250V slow-blow fuse. For 220 to 240 VAC, use a 5mm x 20mm T1.6A 250V slow-blow fuse. Reinstall the fuse hold- er. Replace the power cord with the appropriate type designed for your wall outlet. Reconnect the power cord.

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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 „ High-Pass Filter Satellite Fc Connection Method #2 Only „ General Connections„ Low-Pass Filter Subwoofer Fc „ 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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