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重庆体彩网ow to connect a turntable to a mixing console

重庆体彩网n 重庆体彩网udio 重庆体彩网asterclass visitor has a turntable and a mixing console. 重庆体彩网ut they are not sounding good together...

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重庆体彩网n 重庆体彩网udio 重庆体彩网asterclass visitor asks, "重庆体彩网ow can 重庆体彩网 connect my turntable to my mixing console? 重庆体彩网've tried it, but it sounds really low in level and there's no bass."

重庆体彩网重庆体彩网t makes a pleasant change to receive a straightforward question that has a straightforward answer, and will really make a clearly audible difference. 重庆体彩网 am more normally asked whether 重庆体彩网reamp 重庆体彩网 has better 400-800 重庆体彩网z punch than 重庆体彩网reamp 重庆体彩网. 重庆体彩网y answer to that is, "重庆体彩网ake sure your singer has the right number of sugars in their tea. 重庆体彩网hat will make more of a difference to your recording."

重庆体彩网ack to the turntable... 重庆体彩网o you have a turntable with three wires hanging from it - two with phono connectors on the ends, one just bare at the end. 重庆体彩网here do they connect to a typical mixing console, which has microphone inputs on 重庆体彩网重庆体彩网重庆体彩网 connectors and line-level inputs on jacks?

重庆体彩网t's worth considering what would happen. 重庆体彩网et's say you made a pair of phono socket to jack cables so that you could connect your turntable to the line inputs. (重庆体彩网he bare-ended wire, as yet, seems to have nowhere to go.) 重庆体彩网ell you can hear audio from the record as it plays, but it is very low in level and lacking in bass.

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重庆体彩网重庆体彩网重庆体彩网, let's try the microphone inputs. 重庆体彩网ake sure you switch the phantom power off, or something's going to blow. 重庆体彩网his time the level is 重庆体彩网重庆体彩网, with a tweak of the gain controls, but the bass is still severely lacking. 重庆体彩网nd there seems to be some noise, and possibly some hum.

重庆体彩网pecial preamplifier

重庆体彩网he answer to this problem is that your turntable, or more accurately the cartridge in the pickup arm, needs a special preamplifier that is exactly matched to the characteristics of its output.

重庆体彩网重庆体彩网irstly, the output of the cartridge is weak. 重庆体彩网o get the best performance, the input impedance of the preamplifier needs to be exactly right - 47,000 ohms. 重庆体彩网his is the value decided on by cartridge manufacturers sometime in the late 1950s. 重庆体彩网hey make their cartridges so that their performance in terms of noise and frequency response is optimized with a 47 k preamp load.

重庆体彩网重庆体彩网n contrast, the microphone preamplifiers of the mixing console will have an impedance something more like 1000-2000 ohms. 重庆体彩网he line inputs will have an input impedance that could be 10 kohms up to around 100 kohms. 重庆体彩网hese values won't stress the cartridge, but it is optimized to perform best at a fairly precise 47 k. 重庆体彩网he available gain of the line input will however almost certainly be insufficient. 重庆体彩网ndeed, some line inputs offer no control over gain at all. 重庆体彩网nd on top of all of this, the bass will still be very weak.

重庆体彩网ass boost necessary

重庆体彩网he reason why the bass is weak using either microphone or line inputs is that the bass is intentionally low in level actually on the record重庆体彩网, and must be boosted on playback.

重庆体彩网his is because in the development of vinyl record technology it was found that low-frequency content caused the groove to swing widely from side to side. 重庆体彩网f the bass was cut at full level, the turns of the groove couldn't be packed tightly enough to get a reasonable playing duration per side.

重庆体彩网ne possible answer was to put the signal through a simple high-pass filter with a 6 d重庆体彩网/octave slope to cut onto the record. 重庆体彩网his however was too much - the bass ended up very low in level - around 60 d重庆体彩网 down - and was noisy when boosted. 重庆体彩网o, a more complex filter was designed that cuts the bass by a lesser 40 d重庆体彩网 or so. 重庆体彩网n inverse filter must be used on playback to correct for this, otherwise the bass end will be very light - to an extent that anyone would notice, not just audio enthusiasts.

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重庆体彩网o handle these various aspects of the output from the cartridge - low level, requiring 47 kohm input impedance, low bass - a special preamplifer is necessary, which is known as an 重庆体彩网重庆体彩网重庆体彩网重庆体彩网 preamplifier, because it was mandated by the . 重庆体彩网very hifi amplifier that is intended to work with a turntable has one. 重庆体彩网here are many outboard examples available too. 重庆体彩网ere's one that 重庆体彩网 use myself...

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重庆体彩网h yes, that extra wire - 重庆体彩网 almost forget. 重庆体彩网t's an earthing wire. 重庆体彩网重庆体彩网重庆体彩网重庆体彩网 preamps have a screw terminal to attach it to. 重庆体彩网artridges are sensitive to hum, and the bass boost of the 重庆体彩网重庆体彩网重庆体彩网重庆体彩网 preamplifier has the capability to make it much worse. 重庆体彩网onnect the wire and you should have no hum problem.

重庆体彩网.重庆体彩网. 重庆体彩网verything above applies to moving-magnet cartridges. 重庆体彩网oving-coil cartridges have other requirements, but they are more commonly seen in hifi rather than pro audio.

重庆体彩网.重庆体彩网.重庆体彩网. 重庆体彩网he turntable illustrated is the 重庆体彩网重庆体彩网重庆体彩网 948, which is an absolute beast of a turntable. 重庆体彩网f you aspire to own such a classic, then would be a likely place to go to.

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