Goss Porta Pro Headphones Review

Koss [Chinese name: Gauss] This company, which was founded after the family name, started to use TV rental as its business. Since 1953, it has been involved in the field of stereo headphones. It is not popular among ordinary consumers and belongs to a small brand. The number of its product lines is a headset product that targets the low-end consumer market. However, some models of KOSS also have a certain reputation in "fans", such as high-end electrostatic headphones + amp kit ESP950, but the most popular representative is this Portable headset Porta Pro [referred to as PP].

Porta Pro's headset was launched in 1984! The oldest version was discontinued in 2003, and it has been nearly 20 years since its initial launch. Its appearance has not changed at all, and its unique shape has become a sign. KOSS PP and Sennheiser PX100, Beyerdynamic DT231, AKG K420 and other products are similar in positioning, and have a high reputation, belonging to the older generation of portable earphone products, due to low price and portability, still the headset manufacturers Important revenue source. KOSS PP not only can be partially folded, but also the headband can be contracted, which can control the volume to be smaller and more convenient to carry out. The 1.2-meter-long wire is also suitable for use with a Walkman or mobile phone.

However, an 84-year-old earphone product, no matter how fashionable and forward-looking at the time, PP's shape is absolutely counter-trend rebellious from the perspective of today's people, stainless steel headband and plastic-like unit. Of course, the simple line does not challenge the mold as much as the PX100, but the demolding of the inner plastic is also easy to see. The rough temperament is free to reveal, just like the rambler H500, if it is the 84 version or the 25th anniversary edition. Braided wire, it must be a very durable Internet cafe with headphones... But from the official KOSS product line, most of its headphone products are also the same. Only in recent years, the products have begun to use rich colors and relatively fashionable. The appearance of the stainless steel headband can also withstand a certain degree of bending, from the quality reliability should be much stronger than the PX100.

Rustic is rustic, but KOSS PP wearing comfort is also good in portable headphones. The most complicated active structure of the whole earphone is the comfortZone switch on the left and right channels, which not only becomes an important feature of PP mechanical modeling, but also with the headband. The connecting part and the lower unit are connected by this comfortZone switch, which can adjust the tilting angle of the unit part and the headband in three steps, and the operation mode is also quite strange. It is necessary to press the switch to slide, the degree of tightness is from Light to Firm, to the head. The difference between the pressure feedback of the different gears on the ears is still obvious. The upper part also has a thick sponge as a buffer. The wearing is not only controllable, but also comfortable, suitable for long-term wear. Currently KOSS PP is priced at 379 yuan, not expensive, but the version of the line control and microphone that support the iPhone is priced at 568 yuan. Because this headset has a lot of fakes, consumers who are interested in buying Regular channels of low-priced goods should be cautious, try to choose a seller with formal sales and after-sales protection.

The KOSS PP unit has an impedance of 60 ohms and a sensitivity of 101 dB. Although it seems to be a little hard to drive from the indicator, it only needs to integrate the sound card of the computer motherboard or the mobile phone with a higher output level. The opening of the PP is a bit hard and hard. The low frequency is rustling, but the sound pattern is good, the sound field is relatively open. After 100 hours of continuous downtime, the low frequency becomes relatively soft, and the intermediate frequency resolution is also improved. Then the machine is down for 50 hours, the change is not obvious. Subjective audition, mainly X portable 3S, iPod Touch and other portable audio sources, the sound card part with Monitor 06MX, Surface2 Pro integrated sound card for reference. The main comparison object is Sennheiser PX100II and Edifier H840/H850.

Low-frequency performance: PP's low frequency is the focus of various introductions and propaganda, to highlight the low-frequency sense, style biased to the popular. KOSS's low-frequency dive and texture are not enough, and the details are not as good as many sound quality better new generations of the same grade The earphone products are embossed in the drums, and they are slightly stiff on the integrated sound card and mobile devices. The parts with outstanding sense of volume are in the low frequency band, and the speed is moderate. When playing piano instruments such as piano, the dynamic performance of the low frequency part is stable. Not losing control, but more generous style, but the sense of detail is weak. PP low frequency can also be adjusted by elastic, if adjusted to Light, the amount of low frequency is relatively less.

IF performance: Because the medium and low frequency sense is more, the frequency transient is affected by certain speed, the speed is slower, but the sound is more open and not rigid, the image is stable, but the resolution is relatively poor. If you change the headphones with better grades, It can be easily found that the intermediate frequency level of PP can draw a rough outline, the longitudinal sound field is somewhat inclined, but the loss of detail is quite large, it is difficult to distinguish the difference in detail between high quality MP3 and lossless format. The frequency particles are very thick and the heavy male voice is expressed. And the female voice is slightly older, but the style of this phase sound is more resistant. If you put on a device with better driving force or bile duct amp, although the resolution and dynamic wood are improved, the sound becomes slow. The slow and slugged midrange is believed to be something that some people like.

High-frequency performance: KOSS PP's high frequency is darker, and the speed is faster, the transient performance is general. This style of earphones listens to high-frequency, more detailed orchestral music, silk bamboo music is very unsuitable, although stable but too little detail, high The frequency makes PP's whole sound form somewhat inadequate. It lacks youthful vitality when expressing vocals, especially young female voices. Of course, in the performance of late tastes and stimulating saliva songs and rock music, it can neutralize the harsh high frequency and become More comfortable and resistant.

We also tried to drive PP on HP11, its overall sound improvement is small, but the full driving force will make the sound more slack and warm. KOSS PP sound line is thick, sound is stable, listen to some nostalgic saliva There are certain characteristics in songs, light music or rock metal music. The overall resolution is relatively small compared to the relatively young "antique" of PX100 and H500. It can be seen that the unit technology may not have much progress since 1984. Dynamic stability, sound shape is also relatively healthy, the sound field is relatively open, if you can improve PP a little thick diaphragm, the sound performance may be significantly improved, the high frequency will be more balanced. But consider the ordinary consumer audio quality of that era It is far worse than today. Perhaps the antique desktop radio, tape drive or CD with better headphone drive is more in line with the sound style and positioning of this product. It is also a good choice for game entertainment. Although it is about the modification of PP unit sound and There are a lot of DIYs in various earmuffs, but the sound improvement potential of PP is very small, and there is no tossing value. It is natural to comfortably listen to small volume.