--- product_id: 144724742 title: "Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black)" brand: "topping" price: "VT27156" currency: VUV in_stock: true category: "Electronics" url: https://www.desertcart.vu/products/144724742-topping-nx3s-portable-headphone-amplifier-opa2140-lme49720-usb-bass-gain store_origin: VU region: Vanuatu --- # Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black) **Brand:** topping **Price:** VT27156 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black) by topping - **How much does it cost?** VT27156 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/144724742-topping-nx3s-portable-headphone-amplifier-opa2140-lme49720-usb-bass-gain) ## Best For - topping enthusiasts ## Why This Product - Trusted topping brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Color:Black Topping NX3s Portable Headphone Amplifier Product Name:Topping NX3s Color: Black,Silver Size: 10.7 * 6.6 * 1.36 CM (Excluded protruding parts) Weight: 157G (Excluded accessories) Performance parameters Chipset: OPA2140 + LME49720 Charge Description: DC5V1A, (also can be charged by computer USB port). Input interface: 3.5mm headphone interface Ear output interface: 3.5mm headphone interface Battery capacity: 2400mAh Full fill charging time <4H Standby time >18H Power indicator: Blue (bright red when low power). Charge indication: red when charging (slow charging); orange (fast charge), bright green when full of electricity. Product parameters Total harmonic distortion @a-weighting <0.0017%@ 1KHZ Output=273mw (32Ω) <0.0025%@2020 khz Output=273mW (32Ω) <0.0003%@1 khz Output=50mW (300Ω) <0.0008%@20-20 khz Output=50mw (300Ω) Output amplitude: 11.5vpp @32Ω Gain=L, Bass=OFF 15 Vpp@ 300Ω Gain=L, Bass=OFF Bottom noise: <2.5uVrms @ Gain=L <6.5uVrms @ Gain=H Signal to noise ratio @ A-weighting: >120dB@1kHz Frequency response: 20Hz - 200kHz (±0.55dB) Channel crosstalk: -90db @1khz Channel balance: 0.04dB Gain: 0db/8.8dB Bass boost: 0db/4db (70HZ) Output power: 545mW x 2 @32Ω THD+N<1% 100mW x 2 @ 30Ω THD+N<1% Adapted impedance : 16 - 300Q Package included: 1 * Topping NX3s Headphone Amplifier 1 * USB charge cable 1 * 3.5mm cable 5 pairs * Velcro 2 * Bandage 1 * User's manual 1 * Warranty card 1 * Rubber pad ## Features - ♫ Powerful Input and Output: Nx3s with a 3.5mm headphone jack.NX3s's output power is up to 545mW x 2 @32Ω THD+N<1%, 100mW x 2 @300Ω THD+N<1%, its power is enough for high-impedance headphones. - ♫ Changable Op Amp: OPA2140 + LME49720. LME49720 has an operational amplifier socket and can be changed to other DIP-8 dual op amp. - ♫ Bass and Gain Adjustment：NX3s can satisfy different listening preferences and make up for the lack of earphone bass.0dB / 8.8dB gain regulation. - ♫ Rechargable Lithium Battery:NX3s built in 2400mah Lithium ion battery. NX3s can adaptively charge current of 0.5A or 1A. If 1A current charger is used, it can be filled for 4 hours. - ♫ Portable and Exquisite Design:Delicate, compact, lightweight, and cute that it can be Carry Conveniently. ## Images ![Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black) - Image 1](https://m.media-amazon.com/images/I/311g4YvA83L.jpg) ![Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black) - Image 2](https://m.media-amazon.com/images/I/31ZqPhoEzAL.jpg) ![Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black) - Image 3](https://m.media-amazon.com/images/I/41R4lrYrNuL.jpg) ![Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black) - Image 4](https://m.media-amazon.com/images/I/41vFQ-mtnlL.jpg) ![Topping NX3s Portable Headphone Amplifier OPA2140 LME49720 USB Bass Gain HiFi Digital Audio Power Amplifier(Black) - Image 5](https://m.media-amazon.com/images/I/31UBEqYm-RL.jpg) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/144724742-topping-nx3s-portable-headphone-amplifier-opa2140-lme49720-usb-bass-gain](https://www.desertcart.vu/products/144724742-topping-nx3s-portable-headphone-amplifier-opa2140-lme49720-usb-bass-gain) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-08*