DESCRIPTION:
http://www.xeport.com - Make sure that before you use this clip to test your earphones or loudspeakers, turn the volume of your system down and then gradually increase the setting to a comfortable level.

When you listen to music or other audio signals, there are four major parts that are important to your listening experience;

1. The source - mainly the original recording either in analog or digital format. This sound clip is produced with 44.1kHz sampling rate and set to -16dB full scale in stereo PCM format.

2. The playing system - you could use portable music players or a CD players plus pre/power amplifiers. Most of time, the differences among the audio system are very minimal except poorly made products.

3. Earphone or loudspeaker - this part of the chain is very critical since a audio transducer is like a music instrument. variations in design and production could make a profound difference in sound quality. many people invest hundreds or thousands of dollars in music players and albums while use low quality earphones which in turn wastes the valuable investment all together.

4. Your ear - each individual has different hearing abilities. As people aging over time, most people would experience some degree of hearing loss in terms of sound level and sound frequency range.

What to listen for:

1. Frequency Range - This audio clip is produced from 20Hz to 20kHz. You could test your hearing range in frequency domain.

2. Earphone balance - The sound image should be in the middle all time. At certain frequency, you may hear the sound swing from left to right or vise versa . In case you do hear such movement, most likely that the earphones are not balanced at that frequency. Another possibility is your ears are not balanced at that frequency.

3. Loudness - You should hear a rather smooth sound level cross the whole frequency spectrum. If not, then your earphones or speakers do not have a flat frequency response.

4. Upper frequency limit - In theory, human should be able to hear sound from 20Hz to 20kHz. As mentioned above, when you getting older, the upper limit would drop. I can only hear 13kHz while many teenagers could hear up to 20kHz.

5. Distortion - This sound clip is produced with one frequency at any given moment in time. You should hear only one pure tone always. If you do hear the sound not being pure, most likely you earphones or speakers are distorted. Turn down the volume would help.

Hope this clip could help you to evaluate your earphones and xeport will upload more useful testing signals for your enjoyment in the future.

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