Product Details: The latest production HIFI audiophile power IRS2092 mono digital amplifier board can connect 2 Ohm load. Sound effortless, low-frequency flexible, dynamic class With UPC1237 protection fuction. 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 output power: 1000W / 2? 900W / 4? 600W / 8? Efficiency: >= 90% SNR: 90dB Speaker: 2-4-8? Color: silver or black Dimensions (WHD): 19470270MM Net weight: about 2.4KG. This is a mono amp. Stereo will need 2 of this. Package list: 1 × Finished mono power amplifier. 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!