Nobsound NS-20G Bluetooth Headphone Amp 100W+100W Review

The Nobsound NS-20G is a mini Bluetooth digital amplifier with a headphone output, priced at $45.99. It measures 78 x 90 x 23mm and weighs 160g, and its dual role suits both home and desktop use: drive passive speakers through banana jacks, or plug headphones into the 3.5mm jack.

The amplifier section uses two TPA3116 chips for a rated output of 200W total, 100W per channel, enough to drive most home speakers. The headphone section is more specific: it supports only 15-32 ohm headphones, which covers typical earbuds and portable models but not studio high-impedance cans. One clever feature is that the speaker and headphone outputs can work at the same time, so connecting the headphone output to an active subwoofer while the speaker jacks feed passive speakers builds a 2.1-channel system that greatly enhances bass.

Wirelessly, the NS-20G runs Bluetooth 5.0 with EDR and DSP for real lossless-style transmission over a 15m range, with no audible noise. Bluetooth and AUX inputs cover the usual sources: smartphones, TVs, players, computers and tablets. The front panel carries a multifunction decoding knob and a dynamic volume LED display, set into an integrated aluminum case with crystal speaker jacks, available in black, silver, gold, blue and red.

Douk Audio attaches a firm compatibility warning: the NS-20G is only suitable for 5-8 inch, 4-8 ohm, 20-120W speakers, and using mismatched speakers may result in poor sound as well as over-heat and over-load protection that can cause lag, power-off or even damage. Power input is DC 12V-20V above 60W, with a 19V power supply in the variant that includes one.

Specifications

How it compares

The NS-20G is the only one of these small Bluetooth amps whose page lists a headphone output. The Nobsound NS-01G MAX Amplifier 100W+100W review ($39.99, 78 x 70 x 23mm) has a 3.5mm PRE OUT, but its page says that output does not support headphones. The Nobsound TA-21 Bluetooth DSP Amplifier review ($46.99) shares the NS-20G's 78 x 90 x 23mm footprint and has a TPA3221 chip, yet its page lists no headphone jack. On power, the NS-20G page gives 200W (100W x 2) with no load or supply figure; the NS-01G MAX page says 100W+100W only under 24V at 8A and 30W+30W with its default 19V adapter; the TA-21 page says 100W+100W from a 9V-24V supply of 3A or more.

If your headphones are above 32 ohms, the NS-20G is the wrong tool: its page supports 15-32 ohm headphones only. The Douk Audio A5 PRO TPA3255 Bluetooth Amplifier review ($114.99) lists a headphone output of 500mW at 32 ohms that matches 16-600 ohm headphones, Bluetooth 5.1 and up to 300W x 2 at 4 ohms, in a larger 130 x 112 x 33mm, 525g case. That is a different budget and size. The NS-20G suits a desk with one pair of small speakers plus earbuds or low-impedance headphones, and the choice between it and the TA-21 largely turns on whether you want the headphone jack.

Shipping, returns and warranty

• Shipping: Douk Audio's current shipping page says orders are generally processed no later than the next business day and arrive in 2-8 business days, with duties, taxes and customs fees included in the checkout price unless noted otherwise.
• Older shipping terms are still online: airmail at 10-25 days for parcels under 2 kg, DHL, UPS or FedEx at 5-8 days above that, and a line saying the store is not responsible for import duties. Check the delivery estimate and any duties at checkout.
• Returns: ask within 30 days of delivery and wait for approval before sending anything; an approved return has to ship within 7 days. Items need all packaging and accessories and no excessive wear, or the store can refuse them or refund part of the price. Refunds go to the original payment method after inspection.
• Not refunded: original and expedited shipping, duties, taxes and customs charges, unless the law requires it or the store made the error. The return page does not say who pays return postage, and the older refund page excludes mistaken orders and change-of-mind returns from free after-sale service.
• Warranty: 24 months from purchase for manufacturing defects, with free repair, a replacement unit and free shipping both ways for covered repairs. Drops, liquid, DIY repairs, lightning, extreme temperatures and misuse are excluded (partial fees may apply), and damage from weak packing on the way back may not be covered. The older refund page still says 1 year.
• Seller: the site is run by Shenzhen Anba Technology Co., Ltd (Shenzhen, China) and HONGKONG LONGSHENG Import and Export Trading Co., Limited (Hong Kong); support is by email at [email protected]. These terms cover orders placed on doukaudio.com; other sellers apply their own.

For this product, the page lists US, UK, EU, AU and Other under 'Shipping to' and shows Free Shipping, 2-8 Days Arrival, 30-Day Return and 2-Year Warranty badges near the price.