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Tag Archives: EQ range

So some subwoofer frequencies will be pushed up a bit, this range is regulated and managed by the RIAA (Record Industry Association of America) and the EQ range has become a general rule. If you’ve ever tried to plug the Turntable’s output directly into the line-level input of the amplifier, then you usually have a very small sound and have a sound quality that is thin, bright and without bass band, that’s because Our amplifier has no phonostage circuit.

For regular MC needles or MC low-output needles (usually expensive to stick out the tongue) you need to have a Step-up transformer, this is an amplifier using 2 transformers and it amplifies the signal by the ratio. Due to the transformer a passive device works thanks to the magnetic field, the noise is almost impossible. Some MC circuits in phonostage can also adjust the gain to not use step-up for savings, but usually in a normal phonostage or less. Because MC needles need a large amplification ratio of 1:20 when 1:30 and 1:40, the use of active amplifiers will have big noise floor, which is unacceptable, so there are few big companies in this direction. The choice of step-up transformer depends on the impedance and voltage output of the MC needle so not every needle attached to the step-up is good to hear, sometimes combining the wrong impedance is a treble loss, or is a bass loss.

Each phonostage has a RIAA EQ circuit to reverse this process so it will push the bass band and reduce the treble so that the sound quality is balanced. And phonostage is also an amplifier with an output voltage of only a few thousand volts while the standard output of DACs and CDs will be from 2V – 2.5V so the output signal of the turntable should be amplified before transmitting to your amplifier.

5 / Interim

At this point, you can also understand the basic mechanism of playing music through coal, analog, without the influence of digital components. However, to set up a turntable is something that requires knowledge and meticulousness to every detail, and you can understand why such small cartridge needles have a high price and are guaranteed extremely well managed. This article still has many shortcomings about the knowledge that I will spend on the next part, will write and speak more clearly, but I hope this is enough for everyone to imagine how the vinyls work.