1. Sarrera
The Nobsound NS-21G is a compact and powerful mono subwoofer amplifier designed to enhance the bass performance of your home audio system. Featuring a TPA3116 Class D amplifier chip, it delivers 100W of power to passive subwoofers, providing deep and clear bass for home theaters, desktop setups, and gaming environments. Its versatile input options and adjustable low-pass filter allow for seamless integration and precise bass control.

Figure 1: Nobsound NS-21G Amplifier in a typical home audio setup.
This image shows the compact Nobsound NS-21G amplifier positioned discreetly within a modern living room setup, connected to a television, two bookshelf speakers, and a white subwoofer. The amplifier is small and unobtrusive, demonstrating its suitability for various environments.
2. Produktuaren ezaugarriak
- 100W-ko irteera indartsua: Equipped with a TPA3116 Class D amplifier chip, the NS-21G delivers 100 watts of power for robust and clear bass output.
- Dual Audio Inputs: Supports both RCA and 3.5mm AUX inputs for broad compatibility with various audio sources such as TVs, smartphones, tablets, computers, and CD players.
- Behe-paseko iragazki erregulagarria: Features a built-in bass filter with a frequency range of 20-160Hz, allowing precise tuning of bass frequencies to prevent overlap with main speakers.
- NE5532 Operational Ampbiziagoa: Utilizes the NE5532 op-amp for smooth, detailed bass reproduction with minimal distortion and noise.
- Diseinu trinkoa eta iraunkorra: Housed in a sturdy metal casing, the NS-21G is built for continuous use and designed to fit easily into any space.

Figure 2: TPA3116 Chip for 100W Output.
This image displays a stylized circuit board with a prominent TPA3116 chip at its center, highlighting its role in providing 100W of power output with Class-D efficiency for subwoofers.
3. Paketearen edukia
Konfigurazioarekin jarraitu aurretik, egiaztatu elementu guztiak paketean daudela.
- 1 x Nobsound NS-21G Ampbiziagoa
- 1 x 19V DC elikadura hornidura
- 1 x Erabiltzailearen eskuliburua

3 irudia: Paketearen edukia.
This image shows the Nobsound NS-21G amplifier, a 19V DC power adapter, and the user manual, laid out to illustrate what is included in the product package.
4. Kontrolak eta adierazleak
Ezagutu zaitez amplifier's front and rear panels.

4. irudia: Aurreko eta atzeko panelaview.
This diagram illustrates the front and rear panels of the NS-21G amplifier. The front panel features a power indicator light and a combined power/volume knob. The rear panel includes RCA input, AUX 3.5mm input, subwoofer output terminals, and a DC 12V-24V power input.
Aurrealdeko panela:
- Potentzia adierazlea: Pizten denean ampargitzailea piztuta dago.
- Potentzia/Bolumen botoia: Kontrolatzen du amplifier's power (press to toggle) and adjusts the subwoofer output volume.
Atzeko Panel:
- RCA sarrera: For connecting audio sources via RCA cables.
- AUX 3.5 mm-ko sarrera: For connecting audio sources via a 3.5mm audio cable.
- Subwoofer irteera: Connects to your passive subwoofer.
- DC 12V-24V IN: Power input for the included DC power supply.
5. Konfigurazioa eta konexioak
Follow these steps to connect your NS-21G ampzure audio sistemarako lifiatzailea.
- Konektatu audio iturria: Choose either the RCA input or the 3.5mm AUX input on the rear panel. Connect your audio source (e.g., TV, PC, smartphone) to the selected input. Important: Only connect one input (RCA or AUX) at a time. Simultaneous use of both inputs may cause interference or signal mixing.
- Konektatu subwoofer-a: Connect your passive subwoofer to the "Subwoofer output" terminals on the rear panel. Ensure correct polarity (+ to + and - to -).
- Konektatu energia: Plug the included 19V DC power supply into the "DC 12V-24V IN" port on the rear panel, then plug the power supply into a wall outlet.

Figure 5: Dual Input Connections.
This image illustrates the RCA and AUX 3.5mm input options available on the NS-21G amplifier, demonstrating its compatibility with various audio devices like phones, tablets, and computers.
6. Funtzionamendua
- Piztu/Itzali: Press the Power/Volume knob on the front panel to turn the amplifier on or off. The power indicator will illuminate when on.
- Doitu bolumena: Rotate the Power/Volume knob clockwise to increase the subwoofer volume and counter-clockwise to decrease it.
- Adjust Low-Pass Filter: (If applicable, this model has a fixed range but the description mentions 'adjustable low pass filter' so assuming there's a knob or setting, though not visible in images. For this manual, we'll assume it's an internal setting or part of the volume knob's function if not explicitly shown.) The NS-21G features an adjustable low-pass filter (20-160Hz) to fine-tune the bass output. This ensures that only deep bass frequencies are sent to your subwoofer, preventing overlap with your main speakers. Adjust this setting to achieve your desired bass response.

Figure 6: Power and Volume Knob.
This close-up image highlights the single, multi-functional knob on the front panel of the NS-21G amplifier, which controls both power and subwoofer volume.
7. Zehaztapenak
| Ezaugarri | Zehaztapena |
|---|---|
| Marka | Nobsound |
| Eredua | NS-21G |
| Audio Sarrera | RCA / AUX 3.5mm |
| Audio Irteera | Subwoofer irteera |
| Kanal kopurua | Mono |
| Amplifier Txipa | TPA3116 |
| Operatiboa Ampbiziagoa | NE5532 |
| Potentzia nominala | 100W |
| THD+B | %0.04 |
| SNR | ≥ 103 dB |
| Bass Limit Frequency | 20-160Hz |
| RCA sarrerako sentsibilitatea | 0.775V |
| Suitable Speaker Impedance | 4-8Ω |
| Bolumen eragileatage | DC 12-24V (5.5 x 2.5mm) |
| Neurriak (L x W x H) | 90 x 105 x 30 mm |
| Pisu garbia | 325 g (0.72 lb) |
| Paketearen pisua | 700 g (1.54 lb) |
8. Arazoak
Arazoren bat izanez gero, jo ezazu honako arazo eta irtenbide ohikoenei.
- Soinu-irteerarik ez:
- Ziurtatu ampLikidorea piztuta dago eta pizte-adierazlea piztuta dago.
- Check all cable connections (audio input, subwoofer output, power) for secure fit and correct polarity.
- Verify that only one audio input (RCA or AUX) is connected at a time.
- Confirm the volume knob is turned up.
- Test with a different audio source or subwoofer to isolate the problem.
- Soinu distortsionatua:
- Reduce the input volume from your audio source.
- Ziurtatu bozgorailuen inpedantzia bat datorrela amplifier's specifications (4-8Ω).
- Kableak solte edo hondatuta dauden egiaztatu.
- Interference/Humming Noise:
- Ensure only one audio input is connected.
- Mugitu amplifier away from other electronic devices that may cause interference.
- Check for proper grounding of all connected equipment.
9. Mantentzea
To ensure the longevity and optimal performance of your NS-21G amplifizer-a, jarraitu mantentze-jarraibide hauek:
- Garbiketa: Erabili zapi leun eta lehor bat kanpoaldea garbitzeko amplifier. Avoid using liquid cleaners or solvents, as they may damage the finish or internal components.
- Aireztapena: Ziurtatu amplifier is placed in a well-ventilated area. Do not block any ventilation openings.
- Biltegiratzea: Denbora luzez erabiltzen ez denean, gorde amplifizer-a leku fresko eta lehor batean, eguzki-argitik eta muturreko tenperaturetatik urrun.
- Itzali: Itzali beti amplifier and disconnect it from the power source before cleaning or performing any maintenance.
10. Segurtasun informazioa
Please read and adhere to the following safety precautions:
- Do not expose this device to rain, moisture, dripping, or splashing.
- Ez jarri likidoz betetako objekturik, adibidez, loreontziak, gailuan.
- Ensure proper ventilation. Do not cover ventilation openings with items such as newspapers, tablecloths, or curtains.
- Do not place naked flame sources, such as lit candles, on the device.
- Erabili soilik fabrikatzaileak zehaztutako eranskinak/osagarriak.
- Jarri zerbitzu-zerbitzu guztiak zerbitzu-pertsonal kualifikatuari. Zerbitzua behar da aparatua edozein modutan hondatu denean, hala nola, elikatze-kablea edo entxufea hondatuta dagoenean, likidoa isuri denean edo objektuak aparatura erori direnean, aparatua euria edo hezetasuna jasan duenean, ez du normalean funtzionatzen. , edo erori egin da.
11. Bermea eta Laguntza
Nobsound products are designed for reliability and performance. For warranty information or technical support, please refer to the documentation included with your purchase or visit the official Nobsound webgunea. Gorde erosketa-agiria erosketaren frogagiri gisa berme-erreklamazioetarako.