Weak current College】 【power amplifier and speakers of IP-Power By】 【China power house network.

<br> <br> Design, installation of a sound system, from art, power amplifier and speakers of IP in the tone should be moderate and warm friendly, soft, eventually the whole set equipment restore tone is neutral. From technical considerations, the .power amplifier and speaker adaptors have the following note: power matching; power reserve match; impedance matching; damping coefficient of the match. If we recognise in matching the above four points, the performance of the equipment is fully tapped. <br> <br .> «Ò» ¡ .¢ power matching: in order to achieve high-fidelity listening, rating should be based on the best listening to sound pressure to determine. We all have this feeling: the volume hour sound weak, thin, dynamic out, Matt, lack of low- .frequency significantly, chubbiness, sounds like condensation inside out. Volume is appropriate when sound natural, clear and mellow, soft, supple, strong and dynamic out. But the volume is too large, the sound is not muted, rough and hard, pierced ears .. Therefore to burst pressure level and sound quality is more related to listen to the tempo of the sound pressure level best to 80 ~ 85dB (A weighted), we can hear the tempo to the speaker's distance and speaker features a sensitivity to calculate speaker's rated .power and power amplifier power rating. <br> <br> Second, the power reserve match: speakers: in order to enable them to withstand the programme signals in bursts of intense impact without damage or distortion. Here is an experience value may refer to .: the selected speaker nominal power rating is calculated by the theoretical power of 3 times. <br> <br> Power amplifier: tube amplifier and transistor amplifiers, the law of reserves is different. This is because the electron tube amplifier overload a gentle curve .. On the peak of the musical signal, electron tube amplifier does not clearly clipping phenomenon, just to the top of the sophisticated variable round. This is what we used to say of flexible shear peak. The transistor amplifier in overload, nonlinear distortion rapidly increase ., signal have severe clipping, it does not make the top variable round it neatly squared. Someone with resistors, inductors, capacitors, composed of composite of impedance analog speakers, on several high-quality transistor amplifier for the actual output capacity of the test. .The results show that there is a phase-shifting load, including a logo that 100W amplifier, distortion when 1 per cent of the actual output power only 5W! this for transistor amplifier reserves selection: <br> Gaobaozhengong placed: 10 times <br> .Commercial-grade power amplifier: 6-7 times <br> Civil mid-range power: 3 ~ 4 times <br> While electronic tube power amplifier you can considerably less than the above ratio. <br> <br> For the system's average .sound pressure level and the maximum sound pressure level shall be kept of the number of allowances shall be considered broadcasting under the program's content, the work environment. The redundancy of minimum 10dB, modern pop music, playing music, such as di need 20 ~ 25dB .redundancy so that you can make sound system security, and stability. <br> <br> Third, impedance matching: it refers to the amplifier's rated output impedance, and speaker impedance rating. At this point, the power is in the best design load .line status, so you can give a maximum distortion power, if the speaker impedance rating is greater than the amplifier's rated output impedance of the amplifier's actual output will be less than the rated output power. If the sound is less than the rated impedance of the .amplifier's rated output impedance of the audio system can work, but the power amplifier is in danger, call the overload power amplifier has a comprehensive over-current protection measures to address, on the tube amplifier, impedance matching requirements more stringent. <br> < .br> IV. damping coefficient of match: damping coefficient KD is defined as: KD = amplifier rated output impedance (equal to speakers rated impedance) / internal resistance power amplifier output. Because of the power amplifier output resistance does become speaker of damping devices, .we have decided the KD value sound damping of the electrical. KD the higher the value, the heavier the damping capacity of course power amplifier of KD value is not a better value than General Assembly, KD to speakers, ranging from electric damper overweight so pulse .frontier establishment time growth, reduce the transient response indicators. So when you select the power amplifier should not be one-sided pursuit of KD value. As household gaobaozhengong on damping coefficient has an experience value of reference, the minimum requirements: transistor amplifier KD value .is greater than or equal to 40, electron tube amplifier KD value greater than or equal to 6. <br> <br> Ensure playback of steady-state characteristics and transient characteristics of good basic conditions, should pay attention to the speaker of the effectiveness .of quality factors such as (Qm) and amplifier damping coefficient (KD). This combined with the speaker of the feeder as part of the audio system as a whole. The speaker of the feeder equivalent resistance is small enough, small and speaker impedance rating .is negligible in comparison. In fact, speaker feeder power loss should be less than 0.5dB (about 12 per cent) to achieve this. <br> <br> <br> <br>.