Product Name: 140W Karaoke Inside Amplifier Karaoke System Player Machine Model NO.: KB-330U Conductive Mode: AB Element Number: Push-Pull Amplifier Voltage: AC 220V Output Number: 2 Function: Amplifier Combined, Pre-amplifier Tube Type: Tube Amplifier Used For: Professional Usage: Hi-Fi, AV, KTV System, Club, Disco,Dancing Hall,Theater Type: Karaoke Amplifier Brand: Qsn Series: Kb Trademark: QSN Transport Package: Carton,Woode Case,Flight Case,or as Client Order Specification: CE, ROHS, CCC, FCC, ISO9001, SGS Origin: Guangzhou, China HS Code: 8518400090 Product Description Name:140W Professional Karaoke Inside Amplifier (S-313U)cheap price&high qualityModel: S-313UMaximun output: 2 X 120W 8 ohm 2 X 160W 4ohmFrequency respone: 20Hz-20kHz -0.5dBSignal noise ratio: 78 dBInput sensitivity: 0.15 VTHD: < 0.1%Input impendance: 20KΩConsuption power: 200WMachine dimensions: 430 X 350X 135 mmMODELKB530UKB330UKB230URated output power 8Ω160W× 2140W× 2120W× 2Rated output power 4Ω240W× 2210W× 2180W× 2Frequency response20HZ-20KHZ(-0.2, +0.2dB)Signal-to-noise ratio82dB80dB78dBInput sensitivity0.24V0.24V0.24VTHD≤ 0.05%≤ 0.05%≤ 0.05%Input impedance47KΩ47KΩ47KΩSupply Rated output pawer400W350W300WExchange insurance5A3A3ANet weight9KG8KG7.5KGPackage size mm430W× 340D× 135HPackage Package size mm500W× 440D× 180H