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Speaker Type
Subwoofer
Brand
Nobsound
Is Waterproof
FALSE
Color
Black
Speaker Maximum Output Power
100 Watts


100W Subwoofer Amplifier

Smooth Volume Control

3.5mm AUX Input

Super Mini Size

Nobsound NS-03G SUB

Packing List
  • 1 * SUB Amplifier

Parameters

  • Audio Input: 3.5mm AUX
  • Audio output: Banana plug
  • Power supply: DC 8-25V; at least 3A
  • Maximum Power: 100W @4 ohm
  • Chip: TPA3116D2 + NE5532
  • SNR ≥98dB
  • THD ≤0.04%
  • Terminating Impedance: 2~8 ohm
  • Frequency Range: 20~200Hz
  • Input Sensitivity: ≤280mV

  • Weight: 0.35Kg; 0.2Kg (without package)
  • Dimensions: 68.5 * 33 * 90 mm (not including terminals)

Panel Introduction

Nobsound NS-03G SUB Nobsound NS-03G FR Douk Audio G4 Nobsound G2 Nobsound G2 PRO Nobsound NS-03G SUB Board
Type Subwoofer Amplifier Mono Channel Amplifier Mono / Subwoofer Amplifier Mono / Subwoofer Amplifier Mono / Subwoofer Amplifier Subwoofer Amplifier Board
Max Power 100W 100W 100W 100W 300W 100W
Channel 1.0 1.0 1.0 1.0 1.0 (1.1) 1.0
Input 3.5mm AUX 3.5mm AUX 3.5mm AUX + RCA RCA RCA 3.5mm AUX
Output Passive Subwoofer Passive Mono Speaker Passive Mono Speaker / Subwoofer Passive Mono Speaker / Subwoofer Passive Mono Speaker / Subwoofer + Active Subwoofer Passive Subwoofer
THD ≤0.04% ≤0.04% ≤0.001% ≤0.03% ≤0.03% ≤0.04%
SNR ≥98dB ≥98dB ≥103dB ≥106dB ≥106dB ≥98dB
Speaker Impedance 2~8 ohm 2~8 ohm 4~8 ohm 2~8ohm 4~8 ohm 2~8 ohm
Power Input DC 8-25V >3A (not included) DC 8-25V >3A (not included) 19V 4.74A 19V 4.74A 32V 5A DC 8-25V >3A (not included)
Nobsound NS-01G PRO Douk Audio Tone Douk Audio G3 Nobsound NS-15G Douk Audio M1 PRO Nobsound NS-04G PRO
Type 2-CH Bluetooth 5.0 Power Amplifier (100W) 2-CH Bluetooth 5.0 Power Amplifier (100W) 2-CH Bluetooth 5.0 Power Amplifier (100W) 2-CH Bluetooth 5.0 Power Amplifier (200W) 2-CH Bluetooth 5.0 Power Amplifier (320W) 2-CH Digital Power Amplifier (200W)

Features & details

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.
  • This one doesn’t include a power supply. You can choose our high quality 19V power supply (ASIN: B074J81XRB) or buy the power supply you like. Please choose good quality power supply. We recommend 12~24V, at least 4A.

Product information

Product Warranty: For warranty information about this product, please click here
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Customer Questions

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Q: Is it possible to buy replacement boards from the manufacturer? I dont need the housing.

A: Hello. We have boards for sale,
sub version: https://www.amazon.com/dp/B07H337F4L?ref=my…

Seller DoukAudio | 2 years ago

Q: What is the input jack? RCA? 3.5?

A: 3.5. I run rca into a 3.5 from my radio

Jay | 2 years ago

Q: will this work with an input from a preamp?

A: Not sure. I used input from a receiver and that worked.

Bishnu R. Twanabasu | 4 years ago

Q: Power on/off creates a loud annoying pop. I would like to shut the output with a capacitor…

A: Forget this approach. It won''t work. you cant stick a capacitor on the power source becaus…

R. Allen | 3 months ago

Customer reviews

4.3 out of 54.3 out of 5
460 global ratings

Top reviews from the United States

3dprnt
3.0 out of 5 starsVerified Purchase
Good for the price, too much gain.
Reviewed in the United States on April 11, 2019
I purchased the mono subwoofer version to drive a passive sub for a basic home theater system. First thing I noticed was the gain was way too high, so I replaced the 100k feedback resistor with a 100k pot. Next problem was the cutoff frequency appeared to be around 70hz... See more
I purchased the mono subwoofer version to drive a passive sub for a basic home theater system. First thing I noticed was the gain was way too high, so I replaced the 100k feedback resistor with a 100k pot. Next problem was the cutoff frequency appeared to be around 70hz which is just a little lower then I wanted for the sub. I removed the 3 filter caps to pretty much turn this into a straight amp.

So if your going to use this with anything that has bass management buy the non subwoofer version and let the equipment handle the crossover.

Why 3 stars, mostly the gain, what were they thinking.
18 people found this helpful
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Dale B.
4.0 out of 5 starsVerified Purchase
Cheap replacement for a plate amp
Reviewed in the United States on January 25, 2019
I needed to replace a bad sub amp plate which would have cost close to $100. Instead I took a chance with this Nobsound 100 watt Digital sub amp. It works great for what it is but only with some additional parts: The volume knob doubles as a power switch and... See more
I needed to replace a bad sub amp plate which would have cost close to $100. Instead I took a chance with this Nobsound 100 watt Digital sub amp. It works great for what it is but only with some additional parts:

The volume knob doubles as a power switch and there is no Auto-on feature like most powered subs have.
I''m using a remote power switch(Etekcity) for the sub which avoids having to adjust the bass level every time it''s turned on.
You''ll need your own power supply. Many laptop power supplies will work. I''m using a 24 Volt - 5 Amp brick from an old sound bar and it seems to give about the same power as my previous plate amp that was rated at 100 watts.

You will also need a 3.5 mm to RCA male to male adapter cord to plug your amp/receiver''s sub output into the Nobsound''s input, if your amp has the typical RCA sub out jack.
Connect the Nobsound to your sub speaker with bare wire or binding posts and you''re done.
Like a decent sub should do this little black box runs deep and silent with no hum or buzz, just clean bass sound!
15 people found this helpful
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Jason H.
5.0 out of 5 starsVerified Purchase
Works great on Tactile Transducers
Reviewed in the United States on September 14, 2018
Using it to power 2x 8ohm Tactile Transducers to 4ohm. I''m pulling signal from an already powered sub and was afraid that the high level input wouldn''t be acceptable and would need to convert it to low level but it''s working amazing! I only have it turned to about 30%... See more
Using it to power 2x 8ohm Tactile Transducers to 4ohm. I''m pulling signal from an already powered sub and was afraid that the high level input wouldn''t be acceptable and would need to convert it to low level but it''s working amazing! I only have it turned to about 30% volume as I don''t want them to bottom out or out perform the subwoofer too much! I''ll probably be buying another one when I do a box build and for when I put another transducer on my PC chair!
In the image, I made a center leg for my couch in which these guys are mounted on.
20 people found this helpful
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bpofpv
4.0 out of 5 starsVerified Purchase
Packs a Punch for the Price
Reviewed in the United States on September 22, 2017
The Nobsound arrived promptly with no instructions,specs or diagrams. Trial and error found that an old 65 watt laptop power supply had the right matching barrel connector and that the audio input jack is a standard mini din--same as the jack on an old iPad. The voltage... See more
The Nobsound arrived promptly with no instructions,specs or diagrams. Trial and error found that an old 65 watt laptop power supply had the right matching barrel connector and that the audio input jack is a standard mini din--same as the jack on an old iPad. The voltage range, unspecified, was assumed to be about 10 to 20 volts, as that is what is specified by related products from Douk audio (the presumed parent of Nobsound.)
I salvaged an old Visio 65 watt 3 ohm speaker, packaged it into a 11'''' by 11" plywood box and fired it up.
It worked fine and by driving it with $2.95 Tone Generator App from mediapunkstudios.com, I could verify that the output was reasonable flat from about 40 hz to 400 hz. I did not want to overdrive the speaker, so I cannot comment if the Nobsound can really meet its 100W spec.
The variable resistor that controls the volume works smoothly and a power "on" light is all that is needed for controls.
My total cost for a nice small subwoofer...about $30.
28 people found this helpful
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TJ
4.0 out of 5 starsVerified Purchase
Does the trick
Reviewed in the United States on October 21, 2020
We had a surround sound system in one of the rooms in our house, but no receiver or amp for the passive subwoofer. I picked up a receiver a while back and finally decided to get an amp for the subwoofer. This amp is sleek looking and does the job. The docking of a star is... See more
We had a surround sound system in one of the rooms in our house, but no receiver or amp for the passive subwoofer. I picked up a receiver a while back and finally decided to get an amp for the subwoofer. This amp is sleek looking and does the job. The docking of a star is two-fold. First, it''s not immediately obvious, but the power adapter isn''t included. I picked up an adjustable one from Menards for something around $15 and it works just fine (the one that is sold separately for this is like $18) and that little detail nearly doubles the cost of this amp. The other thing is the banana plugs in the back were torqued down. I tried loosening the one and the whole connector tried spinning in the housing so I wound up just using some banana plug connectors instead of bare wires which was another couple of dollars. If this was a "kit" for perhaps $30 - $35 including the power supply then it would be a complete package.
3 people found this helpful
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Michael Simpson
3.0 out of 5 starsVerified Purchase
Nice Little Amp, With One Design Issue
Reviewed in the United States on August 21, 2020
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... See more
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.
3 people found this helpful
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Not Impressed
4.0 out of 5 starsVerified Purchase
Better than expected.
Reviewed in the United States on December 3, 2019
I purchased this amp and the power supply recommended in the description to replace the PA amp that I had been using to power my home theater sub woofer. Considering the price and size of this amp, I had very low expectations. Upon connecting this little gem, I was amazed.... See more
I purchased this amp and the power supply recommended in the description to replace the PA amp that I had been using to power my home theater sub woofer. Considering the price and size of this amp, I had very low expectations. Upon connecting this little gem, I was amazed. This tiny little box delivers more than enough power to drive the sub. The volume control is smooth, with no noticeable pops, cracks or distortion which is common in an amp in this price range. The sound quality is better than I was expecting as well.

Is this tiny little box comparable to an audiophile amp like the Marantz Mono-block amplifier? No, but the cost is also significantly less. For the price, this is an incredible value. It does exactly what it should and doesn''t break the bank doing it. I can confidently recommend this amp to anyone looking for a decent product at a good price.
4 people found this helpful
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555bts
4.0 out of 5 starsVerified Purchase
Great replacement for panel amplifier
Reviewed in the United States on January 26, 2020
I have a older Polk Audio subwoofer, the built in panel amplifier died years ago and I put it on a shelf in the basement as the replacement amp was over $120. I came across this Nobsound NS-03G sub amp and decided to give it a try. At $25, it was worth a shot.... See more
I have a older Polk Audio subwoofer, the built in panel amplifier died years ago and I put it on a shelf in the basement as the replacement amp was over $120.

I came across this Nobsound NS-03G sub amp and decided to give it a try. At $25, it was worth a shot. The amp does not come with a power supply, which was no surprise considering the price. I found an old IBM laptop power supply at Goodwill for $2.10, problem solved.

I removed the panel amplifier from the sub and cut a piece of plywood to fill the hole and added speaker terminals.

In the end, the total cost of repair was about $30 for a now functioning sub. My only real complaint is the 3.5 mm output jack, it should be an RCA style jack.

Great value for the money.
4 people found this helpful
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Top reviews from other countries

GM
5.0 out of 5 starsVerified Purchase
Great value and it fits in your palm.
Reviewed in Canada on July 31, 2019
Works very well for the price and size, I made an old Creative sub shake walls with this little gem. The built in crossover network seems to work well enough to keep the vast majority of unwanted sound out of the sub channel. As a note the 100 watts is only in to a two ohm...See more
Works very well for the price and size, I made an old Creative sub shake walls with this little gem. The built in crossover network seems to work well enough to keep the vast majority of unwanted sound out of the sub channel. As a note the 100 watts is only in to a two ohm load and will decrease as the resistance increases, you also must power it correctly with a power supply capable of outputting the amperage it will draw, this will affect not only the amp''s performance in terms of output ability but also sound quality so don''t skimp, same goes for your wiring to your sub, bigger is better. The only down side is the input jack being 3.5 mm rather than a standard RCA, easy enough to work around with minor soldering skills and a few jacks and wire. Over all for desktop, medium room or project use I think you''d be hard pressed to find something better at this price point or even double.
7 people found this helpful
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Ken
4.0 out of 5 starsVerified Purchase
Decent little amp, little being the best part of it.
Reviewed in Canada on March 10, 2020
I purchased this to pair with a 6.5 inch pyramid subwoofer to compliment my Edifier R980T speakers. I had been running the sub with a car audio amplifier (100w Rockford Fosgate) which is pretty big and unsightly setup to have in my livingroom. It''s decent and I am...See more
I purchased this to pair with a 6.5 inch pyramid subwoofer to compliment my Edifier R980T speakers. I had been running the sub with a car audio amplifier (100w Rockford Fosgate) which is pretty big and unsightly setup to have in my livingroom. It''s decent and I am continuing to use it over the rockford setup but there is a drop in sound quality, the sound is definitely different, the RF setup had better, smoother sustained bass and while I''m only using a 19v 6A power adapter the speaker doesn''t get enough juice to use it at more than 50% volume without it sounding as if it''s under powered. I''m trying to decide whether or not I should try a 24v 6A+ power adapter or just going in a different direction, definitely going to be keeping this, although not perfect it adds just enough oomf a 40% volume to compliment the R980T''s, I''ll probably try a 24v power adapter and if that doesn''t work I''m going to swap out the capacitors in it with much larger ones I have laying around and see if that helps. I think this would be perfect if you had a old subwoofer from a surround sound system that you wanted to power separately which is most likely where this will end up for a tiny powered sub at camp.
2 people found this helpful
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Jon Dough
5.0 out of 5 starsVerified Purchase
Good value for the price.
Reviewed in Canada on October 20, 2019
Replacement surround sound receiver only has line out for sub so I needed a small amp. This one works very well but only if you provide the full rated power supply. It will work on the minimum voltage and current listed but sound quality will suffer greatly. With a 20v, 5A...See more
Replacement surround sound receiver only has line out for sub so I needed a small amp. This one works very well but only if you provide the full rated power supply. It will work on the minimum voltage and current listed but sound quality will suffer greatly. With a 20v, 5A supply this little thing provides lots of power and doesn’t get very warm at all. Way better than shelling out a few hundred bucks for a powered sub when I already have a good sub. I’m using the subwoofer version so no idea what the full range sound quality is like and the seller doesn’t list much for specifications either on amazon or with the unit.
2 people found this helpful
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Kay R
5.0 out of 5 starsVerified Purchase
Great price for a replacement subwoofer amplifier.
Reviewed in Canada on December 17, 2019
This amp is literally the only subwoofer amplifier on the market for a home audio setup that doesn''t cost over $100+. All you need to do is buy a power supply and you can do that at any liquidation electronics store. They have plenty of laptop power supplies that will work...See more
This amp is literally the only subwoofer amplifier on the market for a home audio setup that doesn''t cost over $100+. All you need to do is buy a power supply and you can do that at any liquidation electronics store. They have plenty of laptop power supplies that will work and that''s what I''m using. This is powering a 3" subwoofer in a 3D printed enclosure engineered by Hexibase. Impressive for a tiny amp powering a tiny sub. Perfect if you need low frequencies.
2 people found this helpful
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Massimo Fasciano
4.0 out of 5 starsVerified Purchase
great little subwoofer amp
Reviewed in Canada on June 1, 2020
This is a great little subwoofer amp. It''s powerful with the right power supply. It has a proper preamp section with stereo to mono summing and a low pass filter. The cut off is perfect for very small subwoofers. Any normal sized sub will need additional lower low pass....See more
This is a great little subwoofer amp. It''s powerful with the right power supply. It has a proper preamp section with stereo to mono summing and a low pass filter. The cut off is perfect for very small subwoofers. Any normal sized sub will need additional lower low pass. Speaker posts are screw in for thin cables or banana for larger ones. Two things I dislike: 1) on-off is built into the volume knob so no way of turning off and keeping the volume set to our liking 2) audio in is mini TRS instead of dual RCA. The jack is loose and any small movement of the cable creates awful popping noises. I tried multiple cables audio cables and none of them are held tighly. There is a pop when turning on or off but it''s not too loud. It stays pretty cool during operation. Overall I''m very happy with my purchase after a few days of testing. Will update this later.
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