--- product_id: 306965966 title: "qtx QA400 Power Amplifier 400W" brand: "qtx" price: "2512170₫" currency: VND in_stock: false reviews_count: 5 url: https://www.desertcart.vn/products/306965966-qtx-qa400-power-amplifier-400w store_origin: VN region: Vietnam --- # 19" Rack-Mountable 240W Power Output Fan-Cooled Design qtx QA400 Power Amplifier 400W **Brand:** qtx **Price:** 2512170₫ **Availability:** ❌ Out of Stock ## Summary > 🎶 Amplify Your Sound, Elevate Your Performance! ## Quick Answers - **What is this?** qtx QA400 Power Amplifier 400W by qtx - **How much does it cost?** 2512170₫ with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/306965966-qtx-qa400-power-amplifier-400w) ## Best For - qtx enthusiasts ## Why This Product - Trusted qtx brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unleash the Power:** Experience a booming 240W output that elevates your sound to new heights. - • **Space-Saving Design:** Compact 2U size fits perfectly in any standard 19" rack setup. - • **Lightweight Champion:** Weighing in at just 5.2 kg, it's easy to transport without sacrificing power. - • **Versatile Connectivity:** Seamlessly connect with 6.3mm jack or RCA inputs for ultimate flexibility. - • **Stay Cool Under Pressure:** Innovative fan-cooled design ensures optimal performance during intense gigs. ## Overview The qtx Q240 Power Amplifier delivers a powerful 240W output, designed for DJs and performers. With versatile connectivity options, a fan-cooled system, and a compact 2U rack-mountable design, it combines performance and portability for any live event. ## Description Product Description QTX | QA400 Power Amplifier | 400W Set Contains: QTX QA Series Power Amplifiers Review: Fully agree with with what others have written about the fan noise. It is extreme - there's no way the amp could be used in a studio - or even home music area in my opinion as the fan noise is too loud. I knew this when I purchased it - I had read the reviews. Managed to get the amp for £70 delivered from desertcart and thought I'd install it and assess the unit myself. After first day, I agreed with the assessment of other buyer - the fan was too noisy and distracting for every day use, so I ordered the Noctua NF-A8 ULN. Like another reviewer, I fitted it with the sound reducing resistor. It was an easy job to open the unit and remove the existing fan - it plugs into a two pin socket on the main PCB board. Two wires only - red and black. I both of these wires at their half way point so that I could keep the same two pin PCB connector. To fit the Noctura, I added the low noise resistor cable, felt where the resistor was in the sleeve and snipped the cable AFTER the resistor. You'll find 3 cables inside the sleeve - yellow, black and black cable after the resistor. From the original two pin PCB connector, solder black to black of the Noctura cable; red to the black wire after the resistor; finally, ignore (tape back) the yellow cable. I used heat shrink sleeving over the solder joints to ensure a tidy and safe installation. I ensured the unit was not connected to the power before commencing the work and wore an earthing bracelet just in case there was any residual charge in capacitors. Unsure how QTX think this unit is sellable and fit for purpose with the factory fan installed. Factoring in my low purchase price and £20 for the new silent fin, I have a great amp now that is totally silent. Real crisp sound that sounds good over most frequencies. Review: Delighted with the amplifier, performance is excellent, much better than the previous amplifier I was using, would highly recommend it. ## Features - High power delivery - Overheat/overload protection - Multiple input and output connection types - Balanced and unbalanced inputs - 2U 19" rack mountable ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003UHO4Q6 | | Brand Name | qtx | | Customer Reviews | 3.8 3.8 out of 5 stars (53) | | Item Dimensions | 48.2 x 27 x 8.8 centimeters | | Item Type Name | qtx QA400 Power amplifier | | Item Weight | 6.8 Kilograms | | Manufacturer | Qtx Sound | | Material Type | Metal, Plastic | | Model | 172.020UK | | Mounting Type | Rack Mount | | Number of Channels | 2 | | Output Power | 400 Watts | | Package Type Name | Rack Mount Box | | Specification Met | TUV | ## Product Details - **Brand:** qtx - **Item dimensions L x W x H:** 48.2 x 27 x 8.8 centimeters - **Manufacturer:** Qtx Sound - **Mounting type:** Rack Mount - **Number of channels:** 2 ## Images ![qtx QA400 Power Amplifier 400W - Image 1](https://m.media-amazon.com/images/I/512r+WzxP2L.jpg) ![qtx QA400 Power Amplifier 400W - Image 2](https://m.media-amazon.com/images/I/51EUznmUFtL.jpg) ![qtx QA400 Power Amplifier 400W - Image 3](https://m.media-amazon.com/images/I/61xF0aGpAeL.jpg) ![qtx QA400 Power Amplifier 400W - Image 4](https://m.media-amazon.com/images/I/71Hokz-0KKL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐ Review *by J***G on 10 September 2021* Fully agree with with what others have written about the fan noise. It is extreme - there's no way the amp could be used in a studio - or even home music area in my opinion as the fan noise is too loud. I knew this when I purchased it - I had read the reviews. Managed to get the amp for £70 delivered from Amazon and thought I'd install it and assess the unit myself. After first day, I agreed with the assessment of other buyer - the fan was too noisy and distracting for every day use, so I ordered the Noctua NF-A8 ULN. Like another reviewer, I fitted it with the sound reducing resistor. It was an easy job to open the unit and remove the existing fan - it plugs into a two pin socket on the main PCB board. Two wires only - red and black. I both of these wires at their half way point so that I could keep the same two pin PCB connector. To fit the Noctura, I added the low noise resistor cable, felt where the resistor was in the sleeve and snipped the cable AFTER the resistor. You'll find 3 cables inside the sleeve - yellow, black and black cable after the resistor. From the original two pin PCB connector, solder black to black of the Noctura cable; red to the black wire after the resistor; finally, ignore (tape back) the yellow cable. I used heat shrink sleeving over the solder joints to ensure a tidy and safe installation. I ensured the unit was not connected to the power before commencing the work and wore an earthing bracelet just in case there was any residual charge in capacitors. Unsure how QTX think this unit is sellable and fit for purpose with the factory fan installed. Factoring in my low purchase price and £20 for the new silent fin, I have a great amp now that is totally silent. Real crisp sound that sounds good over most frequencies. ### ⭐⭐⭐⭐⭐ Review *by A***R on 18 July 2017* Delighted with the amplifier, performance is excellent, much better than the previous amplifier I was using, would highly recommend it. ### ⭐⭐⭐⭐ Review *by I***B on 1 February 2018* It's a stereo power amplifier and does what you expect in that department. I got this version because it has XLR inputs which I wanted to interface to my mixing desk and that is worth the extra money over the non-XLR version. It sounds good to my ears. Internally it's fairly bog-standard (yes, I've already busted the warranty (if there is one) by opening it up for a poke around). There's quite a lot of room in the case and a standard linear power supply running off a 36 volt toroidal transformer. The stereo amplifier is a single PCB with 2SC5200 output transistors, mounted on a chunky fan cooled heatsink. Which brings us to the fan, which is incredibly noisy; the fan in mine is some untraceable far Eastern brand, standard PC fan style (80mm, 12V, 180 mA). So I swapped that for an Arctic F8 and solved the noise problem, but that's only an option if you're comfortable with electronics and opening up the case type of stuff. So I can't recommend the item as shipped without this caveat. It's fine of course if your amp is just going to sit in a rack in a rack room somewhere and then this wouldn't be an issue. Documentation by the way is minimal; you get a single sheet of paper with no specifications or description of the amp at all, just how to plug it in and the uselessly obvious "troubleshooting" of the "is it switched on?" variety. So I dithered over awarding 3 or 4 stars and went with 4. It's otherwise a good amp for the price. If this review appears below various models by the way, mine is the QA 400, which is 70W into 8 ohm and 200W into 4 ohm RMS. ## Frequently Bought Together - qtx | Q240 Power Amplifier | 240W, 172.051UK - The Glowhouse Long Lasting High Density Smoke Fog Fluid DJ & Party Effect Mist Haze Liquid for Machines 1.75L - QTX | Long Lasting Smoke/Fog Fluid for DJ & Party Effect | 1 Litres --- ## 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.vn/products/306965966-qtx-qa400-power-amplifier-400w](https://www.desertcart.vn/products/306965966-qtx-qa400-power-amplifier-400w) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-04-23*