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German Maestro GMH C 8.40 S (GMHC840S)

InfoPoint-Series, Industrial Headset with Microphone for Intercoms, PC Gaming, and Xbox 360

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German Maestro Professional Headsets

Introducing the GMH C 8.40 S stereo headphones, the professional gaming headphone from German Maestro. Each pair of these revolutionary headsets are designed to meet the highest demands and standards that the German Maestro name represents. With a long history of sound research and speaker engineering, the company has released the GMH C 8.40 S high performance headphones. They represent the highest headphone technology and exhibit the most advanced acoustic reproduction. With emphasis on clean accurate sound, these headphone offer the highest efficiency and impressive bass performance. The trebles are crystal clear, the mid-range emphasizes each and every rich detail, and the bass reproduction is quite dynamic. They are made from durable materials that ensure the headphones last many years with constant and consistent use. The soft synthetic leather ear pads ensure a perfect fit and an excellent comfort level for each and every time you put the headset on your head. The user can wear the headphones for hours on end without any discomfort or ear ache. A microphone is built on to the headset to allow use with PC and Xbox 360 games. Now you can retain the highest quality of audio, while being able to communicate with others in the game. The microphone offers incredible sensitivity that is ideal for a gaming headset. You will be heard loud and clear. The cables themselves are highly flexible and include an additional extension cord. The simple design of the headphone allows it to sit comfortably on the ears. For a gaming headset that offers first rate audio quality, choose the GMH C 8.40 S headphones!

Product Features:
  • Info Series Professional Headphones
  • Designed for the PC gamer and audiophiles
  • Made from durable, rigid materials that withstand a lot of use
  • High-performance headphones with the latest in headphone technology
  • Designed with a microphone input for uses on Xbox 360s and PCs that require a microphone input
  • Dual 3.5mm mini-jack cables easily connect to most sound cards
  • Includes an adapter for connection to Xbox 360's
  • Low impedance 40 ohm stereo headphones
  • Meets the highest demands and the German Maestro strict standards
  • High efficiency for accurate and clear sound replication
  • Excellent bass reproduction without overpowering the mid and high frequencies
  • Crisp and clear middle to high frequencies
  • Soft synthetic leather ear pad for the ultimate in comfort
  • Circumaural ear pad
  • Earpad design is carefully engineered for comfort
  • Round cable made of low-oxygen copper for optimal signal transfer
  • Gold plated mini-jack tip
  • Closed design for amazing audio playback
  • Manufacturer Item Number: 93-6313
  • Other Aliases: GMHC8.40S, GMH C 8.40 S, GMHC840-S
  • Authorized Internet Dealer
  • 3-year Manufacturer's warranty
Headphone Specifications:
  • Frequency Response: 18-20,000 Hz
  • Nominal Impedance: 40 Ohm
  • Acoustical Principle: Closed
  • Average pressure on the ear: Approx. 6 N
  • Weight without cable: 7 oz. (200 grams)
  • Connectors: Two stereo mini-jack (3.5 mm) for headphones and microphone
  • Cables: 7.2 ft. (2.2m) Black straight cord
  • Color: Black
Microphone Specifications:
  • Characteristic: Cardioid
  • Frequency Response: 40-18,000 Hz
  • Nominal Impedance: 1000 Ohm
  • Connectors: Two stereo mini-jack (3.5 mm) for headphones and microphone
  • Phantom voltage: 1.5-9 Volts (via mini-jack)

Headphone Design

Headphone Type

Headphone type refers to the construction of the headphones.

Around the Ear means that the headphones wrap around the ear to provide a secure fit. This is most often seen in active and sports headphones.

Around the Neck means that the headphones wrap around the neck. This is also seen in active and sports headphones.

Earbuds means that the right and left sides of the headphones are separated and will fit securely into the ear. These are small, compact, and user friendly.

Over the Head headphones mean that the right and left speakers are connected with a support that goes over the head and rests on top. This is the typical headphone type.

Over the Head
Earpiece Design

This is the design of the earpieces on the headphones. Some headphones go inside the ear, while others rest on the outside of the ear. This helps you know exactly what type of headphones you will be receiving.

In-Ear: The ear buds go into the ear. Most often, the right and left ear buds are two separate pieces.

Enclosed-Ear: Usually are found on the larger headphones. They rest on top of the ear and have padding for comfort, as well as enclosing the ear to the speaker. This type of headphone helps to filter out surrounding noise.

On-Ear: This type of headphone involves the speaker sitting gently on the ear without going in the ear or sealing it off.

Specifically For
Some headphones can use an IR Transmitter in your vehicle, while some can be plugged into your media device and be used on the go or at home.
Acoustic Principle
The basic design of the headphones. There are 3 different types: Open: Have ports that allow air through the back of the diaphragms, enabling the headphones to sound like the music is coming from an outside source. Closed: Completely sealed and have no air passing through the diaphragms. Sounds like you are in a closed off room. Semi-open: Have slots or ports in the back of the cup and are partially open. This allows for a mixed sound between an open and closed headphone.

General Features

Noise Reduction technology removes unwanted noise from a signal. Background or ambient noise can be removed to produce clearer speech and enhanced hearing. Typically these Active Noise Canceling (ANC) headphones are powered and use batteries to activate the noise canceling technology. Also referred to as Noise Reduction or Noise Cancellation.
Headphone Connection
This is how the headphones connect to the audio source.

Corded means that the headphones use a cord to transfer the audio signal.

Wireless means that the audio signal is transmitted wirelessly to the headphones.

1/4" Stereo Jack Adapter
Some headphones will come with a 1/4" stereo jack adapter to connect the usual 3.5mm jack to a 1/4" stereo plug.

1/4" Stereo jack is a larger audio jack that select electronics have.

Volume Adjustment
Volume Adjustment means that the headphone (independent of the source) can adjust the playback volume. Many headphones and ear buds have in-line volume control, which allows adjusting the audible volume from a switch on the headphones cord. Other headphones have a volume knob on the headphone can.
Built-In Microphone
This means that the headphones or earbuds have a built-in microphone. This can be a microphone on the cord, built into the headphone, or even a boom microphone. These mics can be used for music devices like iPods, for Smartphones to make and receive calls, or for gaming purposes.
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
18 - 20,000 Hz
Driver Size
This refers to the diameter of the driver (speaker) on each side of the headphone.
Driver Type
The physical design of the driver in the headphones.
The opposition to electric current, a higher impedance means a higher electrical resistance. This is measured in ohms.
40 ohms
Primary Color
This is the main color of the item.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
3 years
Labor Warranty Duration
3 years
Warranty Provider

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: German Maestro GMH C 8.40 S (GMHC840S)