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Availability:
In Stock.
Arrives
Saturday, Jun 13
Features
- NS-03G is a sub power amplifier for passive subwoofer. Please note it is not compatible with active/powered subwoofers as well as normal speakers.
- It adopts TPA3116D2 chip and can offer 100W high power. With smooth volume control knob.
- Super mini size and solid shell. It can be easily placed on your desktop or your subwoofer.
- 3.5mm AUX input. You can connect various sound sources like phones, CD players, TV very easily.
Item dimensions L x W x H: 2.7 x 1.3 x 3.54 inches
Voltage: 25 Volts (DC)
Manufacturer: Nobsound
Maximum Supply Voltage: 25 Volts (DC)
Minimum Supply Voltage: 12 Volts (DC)
Voltage: 25 Volts (DC)
Maximum Supply Voltage: 25 Volts (DC)
Minimum Supply Voltage: 12 Volts (DC)
Mounting Type: On Your Desktop
Number of Channels: 1
Output Power: 100 Watts
Maximum Output Power: 100W
Item Dimensions: 2.7 x 1.3 x 3.54 inches
Specification Met: Industry Standards (Hifi)
Manufacturer: Nobsound
Model: 4330353845
Brand Name: Nobsound
Part Number: SUB&FR
Item Weight: 0.2 Kilograms
Unit Count: 1 Count
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Jun 13
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Been looking around to power my unpowered sub woofer that I picked up for cheap at a thrift store. It breathed new life into the sub, and works great now. It completed our 5.1 surround system. Plenty of power - just make sure you have a power adapter that'll work with it. The power cord that I had on hand is a bit underpowered, but gives us plenty of bass.
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Reviewed in the United States on September 24, 2025 by Lena
NOTE: This is for woofer speakers that are not amplified and where your main amp does not provide an amplified woofer channel. This amp is doing a great job with the woofer of my sound system! The clarity is awesome and the volume is more than we need for our room! The pricing was very affordable. A couple of things for buyers: This amp requires a separate power supply - the list clearly says this but, of course, I missed that. You can use your own power supply, but since this vendor has a cheap power supply that works, I ordered it and it was there the next day - great service! Easy to setup the amp and power supply (took like 2 minutes) and the bass sound is outstanding! For tech geeks only: the instructions and the website have one MINOR spec contradiction: The amp supports woofer speakers that are as low as 2 ohms and as high as 8 ohms of impedance. The instruction page that comes in the box says it only supports 4 ohms to 8 ohms of impedance, not 2. I talked to the firm and 2 ohms is the correct spec
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Reviewed in the United States on December 18, 2025 by C. Moran
The amp with the recommended power supply work quite well. I am satisfied with it and will keep it. It stays cool at high volumes (8-ohm load). However, here's a few points: (1) The info card states a Terminating Impedance: of 4-8 ohm load.. I think you should disregard the 2 ohm in Amazon spec. (2) They state the terminators are for Banana plugs, but you can connect bare wire by unscrewing the terminals to reveal holes in the posts that can accommodate up to 14 gauge wire. (3) Don't expect good sound anywhere close to 100w with the recommended power supply. (4) An 8-ohm load will sound good up to about 25 watts with the ported enclosure I have - plenty loud for a large room. Your mileage may vary. I have shared the 'manual' in the photo section. Hope this helps...
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Reviewed in the United States on September 19, 2025 by Tim H.
EDIT 17 Aug 2025 Long story short, the new version is a terrible subwoofer amplifier. Note 1: Connect the power supply to the amplifier before plugging it into the wall or power strip. The new version can cause sparks if you reverse that order. Note 2: This amplifier requires a power supply with a 5.5x2.5mm plug. A 5.5x2.1mm plug will not fit. I LOVE my first little Nobsound subwoofer amplifier, but the MFG has changed the design radically since my first purchase in 2022. I cannot give this product more than 1-star as a subwoofer amplifier. There are now fewer capacitors, so this no longer has the power to drive even a modest subwoofer. This is now identical to the full-range amplifier, but with a jumper that sends audio through an RC low-pass filter. The MFG reduced costs not only by reducing the number of capacitors, but also by using electrolytic capacitors rated at 25V instead of polymer capacitors rated for 35V. I do NOT recommend running this higher than 20V. Similarly, the MFG removed the DIP switches (for adjusting the gain) to reduce cost. As a full-frequency amplifier, the power seems similar to a stereo TPA-3118 amplifier I own, though the Nobsound does appear to be using a TPA-3116. While my stereo TPA-3118 amp produces about the same volume on two channels, the Nobsound generates no noticeable hiss. I never noticed any hiss on the older Nobsound amplifier, either, so I am not sure why the new Nobsound has such low power output. I estimate I am getting about 10W out of an 8ohm load with the new Nobsound amplifier. My older Nobsound is probably pushing close to 30W into the same load. Do NOT waste money on the subwoofer version. If you want a clean-sounding mono amplifier to drive a small surround/center channel, go buy the full-range version and a 19V power supply. The cheaper components, fewer capacitors, and seemingly reduced gain make this a terrible subwoofer amp. EDIT 29 July 2025 I love my first subwoofer amp so much, I decided to buy a second one. My first amp has a Blue power light, the new one I received has a Red light. The Blue sounds great powering my 8", 8-ohm HTIAB sub under my desk. I swapped the Blue for the Red to test the new amplifier, and I had to crank the Red volume to max to get what Blue puts out at ~30%. Same cables and power supply, so I know the issue is the Red amp. To further test the new amp, I powered my computer chair bass shakers with the Red amplifier on a 24V 200W Meanwell power supply. Boosting the signal by 21dB through a DSP, I managed to get a reasonable amount of shaking with the volume cranked to 90%, but it shouldn't take this kind of signal boost. Either this amplifier is damaged, or something else is wonky. Returning to Amazon for a replacement amp. Will update review once I receive the new amplifier. ORIGINAL 5-STAR REVIEW 12 Nov 2024 Class-D amplifier uses very little power when not used, so it does not need an auto-off switch. Volume knob doubles as power switch, so you can turn it off manually without unplugging it. A benefit of this type of power switch is that it mitigates any power-on/off popping. Works perfectly with an old 8-ohm 8" passive HTIAB subwoofer rated for 100W. I haven't noticed any noise or hissing with this amp, unlike a different (much higher priced) Class-D sub amp I own. I don't think the Nobsound gets to 100W, but the speaker is plenty loud for a medium room. Connected to a passive sub, this Nobsound amp won't shake the seats in your home cinema... but it would if used as a bass shaker amp. This amp pairs nicely with a 65W/19v laptop power supply and a 50W BST-1 bass shaker. I love how my lounge chair rumbles while watching The Dark Knight, especially when the Batmobile is on screen. I've also hooked it up to four 16ohm 25 watt bass shakers and an old 135W laptop power supply to make my computer chair shake with movies and games alike. I have picked up spare ~19V laptop power supplies free from office buildings being renovated, so I have a few options. This amp has a decent low pass filter, especially for the price, but it will pass the lowest voice frequencies to bass shakers if fed a full signal. I recommend a 70Hz low pass filter, or use an LFE port set to 80Hz, if you plan to drive a bass shaker. The only real negative is it only has a 3.5mm minijack input. I did a head-to-head comparison between this amp and a PBTL/Sub amp from a big F-brand on Amazon. That PBTL/Sub amp did NOT work well at filtering voice frequencies, no matter how I turned the knob. I ended up returning that one and keeping this Nobsound amp. The Nobsound doesn't have a ton of features, but it just works.
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Reviewed in the United States on November 12, 2024 by Chachi79
For its size it works fantastic. I have an old Polk audio subwoofer that the main board inside stopped working. I bought this to bypass that board so I can continue using the sub. The sub is a 4ohm 12" sub in the polk audio box. The amp has no problem driving it. (The included instructions say to use it with 8" or smaller) I have the amp connected to the subwoofer output on my receiver, I did have to get creative with the adaptors. The receiver output is a mono channel RCA (LFE) and the input to this amp has to be a stereo 1/8". I had some extra adaptors laying around so that wasn't an issue. Once connected, powered up and volume adjusted it works great. Doesn't get hot and no static. Hopefully it'll last longer than the Polk audio board did. 5 Star for me. If I come across another broken sub I will buy one of these again.
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Reviewed in the United States on March 3, 2023 by Matt
I bought this little guy to power my Aura bass shaker and WOW! For something the size of a pack of cigarettes this does the trick extremely well. Now to address "the sparks" (oh no, run hide) that people are mentioning. If you cant seem to follow BASIC instructions and unplug the power supply from the amp before unplugging from the wall then yes you do see a few tiny sparks less noteworthy than flicking a lighter once. Big deal, follow instructions. Not sure whats up with the smoking references since I don't but moving on. Now I will concede, the hole the power supply plugs into is a bit big making the connection feel wobbly but once mounted properly youd never have an issue. Buy this cheap, tiny yet powerful amp, buy the SEPERATE power cord (both combined are still very affordable so stop whining), and go town with this thing. VERY IMPRESSED AND WILL BUY ANOTHER SOON!
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Reviewed in the United States on April 6, 2019 by Lisa Conarroe