The charm of the erhu's tone lies in the resonance of the piano skin, and as the vibration frequency increases, the piano skin will gradually loosen, the fibers will age, and the density will decrease. As the skin changes, the timbre of the erhu changes from raw to cooked, from sharp to round, and from hard to soft. Therefore, we must judge the potential and development space of the new erhu from the perspective of development, and grasp the advance amount in order to have a real good erhu. So how to choose a good erhu with development potential?

Step 1: Observe the materials and craftsmanship.

In terms of material, the color and texture of the wood of the piano should be basically the same, and there should be no scars. The uneven density of the wood of the piano will seriously affect the pronunciation of the erhu. It is better to use straight lines on the piano bar, and there is no scar at the position below the jin line. When selecting the piano, the flat end barrel is used to check whether the piano bar is bent or not by aiming at the target. The python skin is required to be medium to thick, the scales are full and uniform in shape, and one or two scales are not affected, but there should be no large or multiple irregular scales. Looking in from the sound window, there is no yellow thread on the back of the python skin, and there is no obvious difference between light and shade.

In terms of technology, the overall balance is better, the mortise is tight, the two axes are parallel and the spacing is equal, and the middle line of the string groove is consistent with the middle line of the leather surface. There is no gap between the edge of the piano skin and the spacer. The skin is tight and even and is hand-skinned. If the skin is soft, the new piano will sound familiar, but it will not last long.

Step 2: Determine whether the piano is born.

The so-called raw qin is first of all to cover the skin tightly, press the skin with the thumb, only a small concave surface. When playing vigorously, it has obvious graininess and good endurance. The sound has the characteristics of "hard, brittle and bright", and the sensitivity is slightly lower. Shuqin (a piano with a loose skin) has a pleasant, mellow sound, less wolf sound, and is easy to master. It is suitable for professionals who are eager to start performing, or Hu friends who don’t have time to start playing. From the concept of "selecting a piano from a development perspective", a new piano must be selected for a new piano.

Step 3: Check the sound quality and volume.

The evaluation standard of sound quality is common and objective, and the judgment of sound quality is a basic skill that needs to be continuously improved in practice. When selecting a piano, the relative consistency of the sound of the upper and lower bars and the inner and outer strings is detected by various strengths, the scales are played with a balanced volume, and the artificial and natural overtones are bright. It is especially important to test several key points of the wolf sound. The key points are no wolf sound. Basically clean. The reverberation of the open strings is long and even.

Since many competitions and performances now do not use loudspeakers, but choose concert halls with good reverberation, the importance of loud volume has been significantly increased in the selection of pianos. The sound of new pianos must be as concentrated as possible, and loud but not scattered. .

If you choose erhu according to the above method, you will generally not miss a good erhu.