First, the constant pressure amplifier with fixed resistance amplifier features: 1. Such constant pressure amplifier power amplifier usually if the rated load voltage amplifier changes, then the power is also undergoing some changes accordingly. Such as 100V, 10W speakers connected to the 70V becomes 5W (100V and 70V power difference doubled). At present such constant pressure amplifier domestic standard 120V, 240V constant pressure standards abroad is 70V, 100V. It requires a certain load of the rated voltage. Constant pressure amplifier to multiple speakers in parallel given in the form of pressure connection for sound academic conference hall attack put, with the principles of the constant pressure amplifier power ≥ total power of the connected speakers * 1.3 (where 1.3 is redundant integrated amplifier TO multimedia classrooms, namely line losses). Second, the constant pressure amplifier with a fixed resistance difference amplifier output form: 1. Constant pressure is not necessarily voltage, but the output is a constant pressure in the form of the lecture hall and digital amplifier applications, it requires a certain load rated voltage. Constant pressure amplifier to form a plurality of parallel connected speakers at constant pressure, as long as the total power does not exceed the total power constant pressure amplifier. 2. Fixed resistance amplifier output load resistor certain requirements. If the load impedance changes in a given resistance amplifier, the power change occurs matched. 8 Ohm 100W amplifier connected to a given 4-ohm resistance becomes close to 200W. Conference room pure power amp | Wuhan video project (certified) | Jiuhua video amplifier is provided by Wuhan Engineering Limited. Jiuhua Video Engineering Co., Ltd., Wuhan (www.jowa-tech.com) is a leader in Wuhan, control and adjust the equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Wuhan Jiuhua video leadership with the staff warmly welcome all inquiries negotiations to create a better video Wuhan Jiuhua future.