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Koss JKO QZ900 - Auriculares de diadema cerrados (reducción de ruido)

1.0 de un máximo de 5 estrellas 1 opinión de cliente

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  • reducción de ruido

Información de producto

Detalles técnicos
Nombre del modeloQZ900
Año de fabricación2009
Peso del producto318 g
Dimensiones del producto21,1 x 20,6 x 7,6 cm
Pilas:1 AAA (Tipo de pila necesaria)
Número de modelo del productoQZ900
Número de productoSRSQZ900
Capacidad de la memoria RAM128000 MB
Tipo de memoria del ordenadorDRAM
Discos adicionalesDVD
Número de procesadores1
Tamaño de las unidades de bastidores1
Interfaz de la tarjeta gráficaAGP
Otras característicasreducción de ruido
Dimensión de la pantalla669.29 centímetros
Tipo de salida de audio3.5 mm
Factor de forma de los auricularesDe diadema cerrados
Descripción de la bateríaAlkaline
Duración media de la batería50 horas
Pilas / baterías incluidasNo
Pilas / baterías necesarias
Tipo de conexión inalámbrica802.11b, 802.11a, 802.11g
Descripción de la interfaz de redAlámbrico
Tipo de conectorCon cable
Incluye batería recargableNo
Información adicional
Clasificación en los más vendidos de Amazon nº349.371 en Electrónica (Ver los 100 más vendidos)
Restricciones de envíoEste producto se puede enviar a España y a otros países seleccionados.
Producto en desde27 de mayo de 2009

Descripción del producto

Otras características:
Audifonos: Circumaural
Autonomía: 50 h
Cantidad: 1
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

Preguntas y respuestas de los clientes

Opiniones de clientes

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Principales opiniones de clientes

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Totalmente decepcionado con estos auriculares!!!
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.
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Opiniones de clientes más útiles en (beta) 3.0 de un máximo de 5 estrellas 31 opiniones
1.0 de un máximo de 5 estrellas Hissing and booming, easily damaged, poor responsiveness, nightmare battery replacement 7 de agosto de 2016
Por Eisenhower Republican - Publicado en
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One star for several reasons: 1) As other reviewers have noted, you have to rip out the right ear cushion to get at the battery, and the cushion on my new headphones already started to rip from the edge on the second time I removed the cushion. 2) Don't try to change the battery on an airplane. You have to somehow get the cushion off (really should use a small flat-blade screwdriver or knife as a pry bar to get it off, and as a pusher to get the cushion to snap back in), and you are not supposed to have such things on a plane. 3) Battery replacement requires juggling the headset, the ear cushion. the battery and the little battery cover, which flies off with a snap. Again, not a good thing on an airplane. 4) The sound on my set was awful -- huge booming noise on one side, and loud hissing on the other (no matter whether I put the headphones on normally, or reversed them left-to-right). In less than five minutes I knew these were terrible. 5) Requires a much stronger input signal than regular earphones. 6) Sound is nowhere as good as my Koss UR80 headphones or even my Koss earbuds. 6) Guess I have to cough up for a Bose, despite the extra expense. Ouch.
23 de 23 personas piensan que la opinión es útil
2.0 de un máximo de 5 estrellas Build quality not up to par 13 de enero de 2010
Por Steve B. - Publicado en
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UPDATE: The build quality is not sufficient. I'm on my second pair in two years and the plastic has failed again. Koss is great about replacing the product for $6, but it is like a the up front cost and then $16 / yr in maintenance ($6 for warranty and $10 to ship).

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.
9 de 9 personas piensan que la opinión es útil
2.0 de un máximo de 5 estrellas Disappointed in Most Aspects 15 de septiembre de 2010
Por Homburg Pokes - Publicado en
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I bought these headphones with the express purpose of wearing them all day at work, and am a loyal Koss buyer because of their lifetime warranty. I own several other pair of Koss headphones, including the PRO3AA which Koss has replaced each time I break the ear hinge. I'm loyal because the PRO3AA sound great and Koss treats me like they want my return business.

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.
39 de 39 personas piensan que la opinión es útil
4.0 de un máximo de 5 estrellas A good alternative to Bose QC-2 9 de septiembre de 2009
Por TXFlyer - Publicado en
I bought the Koss QZ900 headphones, after a lot of research, as a lower cost alternative to the Bose QC-2 headphones. I've had a chance to compare them to both the QC-2 and QC-3. No question, the Bose QC-2 (over the ear) headphones have the edge. However, I did not care for the QC-3 (on the ear) headphones. On a recent trip across the Atlantic, the airline I was on distributed the Bose QC-3 headphones for use during the flight. I tried the Bose QC-3s, put them up, and used my Koss QZ900 headphones instead.

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.
8 de 8 personas piensan que la opinión es útil
2.0 de un máximo de 5 estrellas Headband keeps breaking: 3pr in 2 yrs 21 de octubre de 2010
Por Y. Werde - Publicado en
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I was attracted by Koss by their lifetime warranty and reputation for reasonable quality. Sad to say that I have have to exercise that warranty 3 time on my QZX900. Each time for the same problem. The plastic band that joins the ear cup to the headband keeps breaking. I do not abuse the headphones. The breakage comes during the normal process of putting them on and taking them off. The part should not be made out out cheap plastic. I will now send my phone back with another $5 processing fee and when I get my new pair will give them to a friend to use. No more Koss for me

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