How To Repair Koss Pro 4aa Headphones

Headphones Koss PRO-4AA Titanium

I noticed immediately that these headphones is not for the weak ears: impressive weight and great effort of cushions tin can cause discomfort. Closed design and dumbo material also makes it difficult ventilation. But the headphones are Soundproofed and skillful sensitivity. Even so, a high resistance 250 Ohm) will make information technology difficult for quality reproduction for use with portable appliances. For their buildup demand a powerful amplifier. Characteristic of the given model in the use of titanium blanket for increased stiffness of the cone of the radiator. Twisted cords will not become in the style and will permit you to focus on the music.

Significant prevalence of bass and lower mid causes a shift of the tonal system down, and painting in this part of the range, which, however, does non extend upward. Headphones weakly damping bass. Loftier-frequency detail in the sound PRO-4AAT missing. When the model reproduces large write performing groups: orchestras and bigband), lost the depth of the prototype, line "bunch up". This model can exist recommended to those who love to the sound was a lot of bass.

Side view.

Fig.1. Frequency Response

Fig.2. Nonlinear distortion cistron

Fig.iii. Module input impedance

Immediately catches the eye hump response in depression frequencies (40 Hz - 1 kHz), with a height of 16 dB. It is noticeable shifts tonal balance in the management of the bass. Nevertheless, it should be noted that this is not accompanied past an increase in non-linear distortion and throughout the surge THD is at a very low level. Next, from 1 kHz to 10 kHz frequency response is characterized by a minor imbalance and depression inequality. Here CED increases slightly, only remains at quite reasonable. To a higher place 10 kHz frequency response forms a ravine with a depth of 16 dB. Although the schedule is returned once again to nil to xx kHz, a deep failure creates a shortage of high-frequency components. At the lesser of the ravine (fifteen kHz) also noted a sharp increment in not-linear distortions. Co-ordinate to the schedule CED shows that distortion strongly depend on bespeak strength, and to high volume them to the lowest degree of all in the whole measuring range. Probably, it is connected with more severe and rigid cone with titanium coating.