INTRODUCTION
Thank you for purchasing a pair of PSB Speakers M4U 8 MKII Headphones. Producing natural musical dynamics and
precisely imaged sound, these high-fidelity headphones bring you closer to the music you love.
Engineered with 50 years of audio excellence and research, the M4U 8 MKII delievers unmatched sound quality, all-day
comfort and fold-and-go portability, for music enthusiasts and professionals. PSB’s true-to-nature sound quality and stylish
ergonomic design allow you to escape to a personal concert experience that travels anywhere with you.
REGULATORY INFORMATION
Operating Temperature Range:
5°C – 40°C
Operating Frequency Range:
Bluetooth 2.4G
Max Output Power:
5.5mW
Input
Rating:
5VDC,
1A
Battery
Rating:
1.2V,
1000mAh
Battery Charging Time:
4 hours
Weight:
332
grams
Is in compliance with the essential requirements and other relevant provisions of Directive 2014/53/EU.
Date of Manufacture: The second and third digits in the serial number indicates the year of manufacture; “21” is 2021.
Responsible Party: Lenbrook Industries Limited. 633 Granite Court, Pickering, Ontario, Canada L1W 3K1. Phone: (905) 831-
6333, Facsimile: (905) 831-6936
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use if such marks
by PSB Speakers is under license.
The N-Mark is a trademark or registered trademark of the NFC Forum, Inc. in the United States and in other countries.
To prevent possible hearing damage, do not listen at high volume levels for long periods.
OSHA Guidelines for Noise Exposure Limits
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.
SAFETY INFORMATION
Please read this booklet to ensure that you are getting the most out of your PSB product and 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.
FCC ID: SVC-PSBM4U8MKII
90dB
8 hours
95dB
4 hours
100dB
2 hours
105dB
1 Hour
110dB
30 minutes
115dB
15 minutes
120dB
Avoid as damage may occur