INTRODUCTION
SAFETY INFORMATION
Thank you for purchasing a pair of PSB Speakers M4U Headphones, a highly developed set of headphones that
captures all the sounds from your music and video collections, and brings them into your personal space. Producing
natural musical dynamics and precisely imaged sound, these hi-fi headphones will bring you closer to the music you
love.
Engineered with over 40 years of audio excellence and research, the M4U Headphones from PSB Speakers will
deliver unmatched sound quality, all-day comfort and fold-and-go portability for today's music enthusiasts and
professionals. With PSB's true-to-nature sound quality and stylish ergonomic designs, you can escape to a personal
concert experience that will travel anywhere with you.
By supplying this Owner's Guide, we hope you will read through this booklet to help assure that you are getting the
most out of your PSB product and your music.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
The Occupational Safety Health Administration (OSHA) has issued headphone usage recommendations for maximum
daily exposure and sound pressure levels [measured in decibels (dB)]. A decibel is a unit of sound measurement that
increases exponentially with volume. For example, conversational speech is typically around 60dB, and a rock
concert in a stadium is often about 110dB.
Maximum Sound Pressure Level Recommended For Daily Use (see below):
OSHA Guidelines for Noise Exposure Limits
Figure 1
ENGLISH
Keep batteries out of reach of children.
Do not attempt to modify this product as it could result in personal injury and/or product failure.
If water or other foreign substances permeate inside the device, fire or electric shock may result.
Long-term exposure to loud music may cause permanent hearing damage. To avoid personal injury when using
the headphones, the volume should be kept at the described levels in Figure 1, especially for extended
listening periods.
Warnings or announcements may be unnoticed when you are using the headphones. You should be aware of
ambient sounds while wearing the headphones, and recognize them as needed.
WARNING:
Figure 1
Avoid as Damage May Occur
15 Minutes30 Minutes1 Hour105dB
8 Hours
90dB 95dB 4 Hours 100dB 2 Hours
120dB
110dB 115dB
2
