Question 1

cna these be used with an ipad?

Accepted Answer

I would think they would, they come with a large plug converter down to the small plug. Which I removed to allow it to connect to a sound card on a personal computer (which is the same plug on the device you want to use it on).

The problem is going to be in amplification. These earphones have large diaphram speakers, which require a lot of power to be driven, or listened to. At least with any volume. You may be able to get the volume up to adequate listening, but it may require a lot of battery power, or pre-amplification. Thus using more of your battery, and not giving you much time to listen before you look for a recharge. This is one of the reasons smaller devices use ear buds, as they dont require much power to get smaller drivers to high volumes.

The other issue, and one I would think anyone using these earphones should be concerned with, is, the isolation of outside sounds. As I mentioned in my original review, these earphones insolate the listener so much, that, you really don't hear outside sounds, like warning horns, emergency alerts, etc... These earphones are far more a concern than ear buds when it comes to using them outdoors. Not so much the fact you can't get them so loud you can't hear the World around you, but that they insolate the listener more, even at lower volume levels.

Question 2

What features make the KOSS QZ-99 headphones suitable for noise reduction?

Accepted Answer

The KOSS QZ-99 headphones feature closed Pneumalite ear cushions and an extra-secure headband that create a tight seal around the ear, eliminating all ambient noise. They also have neodymium magnet structures for outstanding clarity and definition.

Question 3

What is the frequency response range of the KOSS QZ-99 headphones?

Accepted Answer

The frequency response range of the KOSS QZ-99 headphones is 40Hz to 20KHz.

Frequency Response	40 - 20,000Hz
Impedance	60 Ohms
Sensitivity	102dB SPL/1mW
Cord	Coiled, Single Entry, 8 feet with 3.5mm plug

Type	Noise Cancelling
Color	Black
Frequency Response	40Hz-20KHz
THD	<0.3%
Input Impedance	60 ohms
Sensitivity	102 dB SPL/1mW
Connector	3.5mm/ 6.3mm
Ear Coupling	Circumaural
Cord Length	Coiled, Single Entry, 8ft
Weight	15 oz
Noise Cancelling	Passive

Compatibility	N/A
Features	The Koss Quiet Zone QZ99 stereophone is an extra-durable stereophone that delivers amazing passive noise reduction. Designed initially for use with racing radio scanners and metal detectors, the QZ99 has been a favorite for a wide range of listeners who need to cut high levels of ambient noise. Built to withstand the rigors of outdoor or indoor use, the QZ99 features both a 3.5 mm and 6.4 mm plug and will connect to most radios and scanners. The QZ99 features neodymium magnet structures for outstanding clarity and definition. Closed, Pneumalite ear cushions and extra-secure headband pressure create a complete seal around the ear eliminating all ambient noise from getting through. A volume control on the ear cup allows for easy level adjustment if the sound source is out of reach. A Stereo/Mono switch extends your user flexibility.

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KOSS Black QZ-99 3.5mm/ 6.3mm Connector Circumaural Headphone

Overview

KOSS QZ99 Passive Noise Reduction Headphones

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Model
Brand	KOSS
Model	QZ-99

Item#: N82E16826106370