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Availability:
In Stock.
Arrives
Jan 5 – Jan 6
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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
Mounting Type: On Your Desktop
Brand: Nobsound
Item dimensions L x W x H: 2.7 x 1.3 x 3.54 inches
Voltage: 25 Volts (DC)
Manufacturer: Nobsound
Mounting Type: On Your Desktop
Brand: Nobsound
Number of Channels: 1
Product Dimensions: 2.7 x 1.3 x 3.54 inches
Item Weight: 7 ounces
Item model number: 4330353845
Is Discontinued By Manufacturer: No
Date First Available: June 12, 2017
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jan 5 – Jan 6
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
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
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. 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 Chachi79
What a little beast. Especially for about 20 bucks. I had a subwoofer driver for a car, that I wanted to put in a box for my home entertainment center. But I decided I like watching it shake when the bass hits, so I just hooked it up in my entertainment center bare naked, and pressed it against the wood of my entertainment center so it carried the sound. It looks really cool like that. I just needed a little amp to get it started, and this does the job in spades. The only problem I had was that it seems to push more power than it's rated for, an unusual problem. As such, I ended up blowing through a couple AC adapters. This is when I was kicking up the bass of my preamp all the way. So I found another (a third) one at a thrift store, and I don't dare max it again.
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Reviewed in the United States on November 18, 2019 by M. Heu
The media could not be loaded. I bought one of these and used it to power a bass shaker under my office/gaming chair. It worked well in that capacity for a year, but then stopped working, though the light still came on. EDIT: This turned out to be downstream from the amplifier, and not the amplifier's fault. The amplifier does its job nicely as long as all the wiring is good. However, the unit will generate sparks if the power adapter is plugged to the wall before plugging it into the amplifier! See video. This happens even with the unit turned off. This behavior is apparently by design (there is a blurb in the printed instruction sheet about it), but not what I would have expected. I don't expect there's a huge safety issue with this, but I imagine the issue could be designed away with a different circuit or power jack, so to me that's worth a star.
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Reviewed in the United States on August 21, 2020 by Michael Simpson