Koss JKO QZ900 - Auriculares de diadema cerrados (reducción de ruido)
Descripción del producto
Autonomía: 50 h
Color del producto: Negro, Plata
Control de volumen: Giratorio
Frecuencia de auricular: 20 - 20000 Hz
Interfaz del dispositivo: 3.5 mm (1/8 ")
Longitud de cable: 1,2 m
Obstrucción: 32 Ohmio
Sensibilidad de auricular: 100 Db
Tecnología de batería: Alcalino
Tecnología de conectividad: Alámbrico
Tipo de batería: AAA
Opiniones de clientes
Principales opiniones de clientes
El sistema de reduccion de ruido es patetico, ensuciando mas el sonido en lugar de aislarlo.
Y el colmo es que la diadema no ha aguantado ni seis meses, se ha roto. La web de Koss indica que sus auriculares estan garantizados de por vida, pero mucho me temo que esa opcion solo se encuentra disponible en terreno norteamericano.
Opiniones de clientes más útiles en Amazon.com (beta)
I did a lot of research on various noise canceling headphones and landed on the QZ900 for the following reasons: Over ear design, in-line volume control, price, previous experience with Koss headphones.
I agree with one of the other reviewers this product is capable of producing a lot of bass which I believe is a good thing. The bass is of good sound quality and clarity. One can easily adjust the EQ settings on their device to their preferred bass level. On the contrary if a headphone is not capable of producing bass, it doesn't matter how you set the EQ, you will never get good bass response. All my previous Koss products have had rich bass and I was hoping this product would follow suite and it did - I can't say the same for the Bose products I own (hit or miss).
The overall sound quality is exceptional, both in active and passive modes!
The product does a decent job of sound canceling. It is by no means sound proof. On the plane it lowers the sound level of the engines and background noises and allows one to go off into their own space without all the distractions.
The QZ900 are extremely comfortable; they are lighter and softer on the head than the PRO3AA, and I do feel like I could wear them all day without a problem.
The noise cancellation definitely works, it does not remove all ambient noise, but it removes the doldrums of large fans both at home and at work. The noise cancellation is noticeable and at about the level I expected for the price. Good, not superb.
The design to replace the battery for noise cancellation (about every 40 hours according to the manual) is incredibly poor. Prying the ear cushion off of plastic holds each week is not a good idea. However, once they break, Koss offers their lifetime warranty. Nonetheless, I wish the design was different.
Unfortunately, the sound quality is lackluster compared to the price tag. I have used them both with my iPod Touch and on a high end computer sound card with high quality VBR MP3 and FLAC audio. I expected them to sound at least on par with the PRO3AA, but they just don't have the clarity. Worse yet, the sound WITHOUT the noise cancellation turned on is pitifully flat. It is flat, flat, flat...disappointing muffled and flat. Once you turn on the noise cancellation the sound improves, but still falls short of my expectations. The clarity of the PRO3AA is never approached, and compared to the Bose over-the-ear headphones (no noise cancellation and lower cost) I tested in the store, these sound pitiful. I was hoping for better audio and these fail to deliver. If I had to compare the sound quality, I would say that it is on par with a $50 pair of quality over-the-ear headphones, not the Koss clarity I was hoping for.
I will likely return these for another Koss product, because they have repeatedly earned my business with their unparalleled warranty.
**Update November 12th 2010**
Broken left ear phone bracket. How did it break? Putting them on, the same way my Koss PRO3AA have broken 3 times. Each time Koss replaces them. After my previous review I decided not to send them back. Now I'll pay to ship them back and receive a brand new pair. It's unfortunate. Perhaps I'll appeal to Koss to replace them with a different pair of headphones, even at a lesser price.
The Koss headphones sound nearly as good, and have nearly as good noise cancellation as the Bose QC-2. They are light, compact, use a AA battery, and have a volume control on the removable cord. The one negative about the product is that the carrying case is larger (thicker) than it has to be.
If money is no object, go with the Bose QC-2s. If you can't justify the $270 for heaphones, the Koss QZ900s are a good choice.