Product Details: It adopts American IRFP4227 and IRS2092S design, the rated effective power is 1kW, and it can be connected with 28 ohm speakers. The intelligent temperature-controlled fan can not only dissipate heat and save energy but also reduce noise. All imported components are added with SMT technology, which has excellent workmanship, low distortion, and stable and reliable performance. It is equipped with AVX tantalum capacitors, ELNA blue robe infinite audio capacitors, imported high-frequency capacitors and other high-end components. The sound is mellow and the bass is flexible and powerful. It is a must for every enthusiast Great product to play. With output short-circuit protection, output DC bias protection, namely speaker protection, and over-temperature protection. American CMC816 gold-plated RCA terminal, crystal speaker terminal. Note: This is a pure Power amp. Please connect with preamp to use it. And before power on, Please first set the preamp at low volume. Specifications: Working voltage: AC110V or AC220V (optional) Note: The AC110V version power board is different from the picture. AC110-AC120V input, the power supply board need to custom-make. Maximum rated output power: 1000W (4 ohm load, 1% distortion) Efficiency: >=90% Signal to noise ratio: 90dB Total harmonic distortion: 1000W 4 ohm speaker, distortion degree. The AC power cord is not included by default. We are dedicated to offer the best audio-visual products at the lowest price to our customers. Bringing great products and customer service, and thus help enriching our customers’ lives is our ultimate goal. (Except some countries and APO/FPO). You should check the product’s appearance safety before to sign receipt. Else we can’t seek compensation with the couriers. Since online shopping uncertainty, so thank u very much for choosing&trusting us. Our service is ready to help u any time, your feedback is extremely important to us. If you are satisfied, please leave 5 stars positive feedbacks, It’s very honored for us to achieve generous authentic assessments, thx!