Weak current College】 【audio equipment connections.

Audio equipment in connection need to pay attention to what issues?

Audio equipment at all levels of matching between the more important. If connected improperly not only affect the equipment of the replay results, or even cause damage to the equipment.

1. equipment connected basic requirements:

(1) of the signal level of the match:

When connecting to audio equipment is important to note that the equipment between the input and output signal level differences. If the first-level equipment input signal level is too large, it will have a nonlinear distortion, otherwise it will be landing Thi Replay system-to-noise ratio, or even contribute to the next level of equipment of the amplifier, so pay attention to when the connection of equipment between level should not be too great a difference. If the actual signal level does not appear in the adapter, you must enter through the attenuation circuit to reduce the signal level, or through the amplifier so that the input signal level. For General moving coil microphone output voltage to a few millivolt, hence the need for a level amplifier the signal amplification evacuation to preamplifier. For recording, CD player and LD machine, because its output signal level 0.755 ~ 1V above, it can be directly fed into the preamplifier.

(2) impedance matching:

In HI-FI audio equipment, such as transistor power amplifier output impedance for low impedance and tube amplifiers equipment output impedance is high impedance. If they connect with speaker impedance mismatch will cause the amplifier output power distribution, or damping Ambassador speakers transient characteristics variation.

Impedance matching connection generally balanced and not balanced. The so-called balance refers to the transmit signal of two-core screened cable impedance to ground. The so-called non-balance refers to the two-core screened cable, which has a grounding. When the balance between output and unbalanced input connected, must be matched with matching transformer.

2. plug connection method:

In HI-FI audio equipment, equipment connections is dependent on various connectors, common connectors have several. Tone P14.

(1) 2-wire plug: mainly used to transport a wide variety of equipment signals between the input signal and as a microphone input jack. According to its diameter is divided into a 2.5mm, 3.5mm, 6.5mm three.

(2) Lotus plug: mainly used in the audio equipment and video equipment for the lines between the input and output jack.

(3) card Lennon plugs (XLR): mainly used for microphones and amplifiers.

(4) five core socket (DIN): mainly applicable for card recording, and the connection between the amplifier, it can be a stereo input and output signals are concentrated in a outlet.

(5) RCA connectors: RCA plug is mainly used for equipment in the video signal transmission.

(6) F, M plug: it is mainly used for audio-visual equipment in the RF signal input and output.