PRO4AA Over Ear Headphones. Koss Pro4AA headphones set the standard for full size professional headphones. They were introduced in 1970 as the first dynamic headphones to deliver true full frequency and high fidelity performance with impressive noise isolating capabilities. $114.99.
The Koss Porta Pro KTC are decent-sounding and portable on-ear headphones for critical listening and mixed usage. They're lightweight, comfortable, and have a compact, retro design that will work for some. They also have a decently balanced and open sound for an on-ear device although they won't be the best sounding headphones for more serious
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sound pressure level. 90dB/mW. 111dB/mW. Devices with a higher sound pressure level are generally louder when supplied with any given audio source. has a neodymium magnet. Bose QuietComfort 35 II. Koss Porta Pro Wireless. Devices with neodymium magnets are lighter and more powerful than those which use ferrite magnets.

I strongly suspect that the variability of reviews on the Koss Wireless PortaPro sound is a reflection of the Bluetooth protocol. The headphones support Bluetooth 4.2. With AptX, the sound is just fine. Without it - paired with a mobile iOS device, there is a noticeable degradation of sound. Worse soundstage, slightly muddy reproduction overall.
Koss Porta Pro On Ear Headphones with Case, Black / Silver - Tình trạng: Hàng Brand new nguyên seal mới 100%. - Xuất xứ: Hàng USA, bảo hành 12 tháng. - Model: Koss Porta Pro - ASIN: B00001P4ZH (Google mã này để xem chi tiết thông tin và đánh giá sản phẩm trên Amazon) Koss Porta Pro tượng đài tai nghe 35
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koss porta pro bluetooth review