Locating the Unit, Mounting, Audio Inputs and Outputs

Model 750

Locating the Unit

Physical access and mechanical noise are the primary factors when choosing a mounting location. By its very nature as an audio mixer, an operator will need easy access to all the controls, as well as good sight lines to the meters. In most cases the internal microphone, located on the upper right side of the front panel, will be used, so be careful that you don’t have a cooling fan blowing directly onto it.

As a device that contains high gain audio stages, hum and noise pickup is possible through the chassis and associated ca- bling. Locating the unit away from devices that radiate strong AC fields is an excellent idea. The left side of the Model 750, which contains the microphone preamplifiers, is the area most sensitive to noise pickup.

Also, it is possible that the Model 750’s power transformer may radiate energy into adjacent equipment. It is located at the right, bottom rear corner of the unit, and may need to be physically isolated from sensitive equipment, especially videotape recorders.

Mounting

The Model 750 is intended for rack mount- ing, requiring two standard rack spaces (3.5 inches). It weights approximately 14 pounds (6.4kg), and operates on either 100, 120, or 200/240V, 50/60Hz. The unit is secured to the front mounting rails of an equipment rack using two mounting screws per side.

Audio Inputs and Outputs

The Model 750’s audio input and output connections are made using 3-pin XLR- type and ¼-inch 3-conductor phone jacks.

Balanced Connections

(Input & Output)

Ring (–)

Tip ( + )

Sleeve (Shield)

(Switchcraft No. 297, Neutrik NP3C, or equivalent)

Figure 3. Recommended phone plugs

Don’t be concerned about our use of phone jacks as part of a “professional” product. The jacks used feature gold- plated contacts for high reliability. As much as we wanted to, there was simply no room in only two rack spaces to use all XLR-type connectors.

Caution: For reliable audio intercon- nection, the phone plugs you use must comply with industry-standard RS-453. Switchcraft No. 297 or Neutrik NP3C are highly recommended.

Mic/Line Inputs

The Model 750 contains four input chan- nels that are compatible with microphone or line-level sources. Each of the four Mic/Line inputs use a single 3-pin female XLR-type connector. Prepare the mating connectors (males) so that pin 2 is signal high (+ or hot), pin 3 is low (– or cold), and pin 1 is shield.

It is expected that the mic/line inputs will be wired to input/output connector panels located on the side or rear of the vehicle. It’s also nice to have one or two of the inputs “multed” to connectors inside the vehicle, allowing the quick connection of

Model 750 User Guide	Issue 3, May 1997
Studio Technologies, Inc.	Page 11

750 specifications

The Fostex 750 is a premium closed-back headphone that has garnered attention for its combination of advanced technology, comfort, and sound fidelity. Designed primarily for studio applications, the Fostex 750 delivers an exceptional listening experience that caters to both professionals and audiophiles alike.

One of the main features of the Fostex 750 is its dynamic driver technology. The headphones are equipped with large 50mm titanium-coated drivers that provide a powerful and clear sound reproduction. This driver configuration is engineered to deliver a wide frequency response, ranging from deep bass to sparkling highs, ensuring that every detail of the audio is captured. With an impedance of 25 Ohms, the headphones are highly efficient and can be easily driven by a variety of devices, including portable music players and digital audio converters.

Comfort is another highlight of the Fostex 750. The headphones feature plush ear pads made from soft polyurethane, which provide excellent cushioning for extended listening sessions. The adjustable headband offers a customizable fit, allowing users to achieve an optimal acoustic seal that enhances sound isolation. This is particularly beneficial in studio environments, where external noise can interfere with critical listening.

In terms of build quality, the Fostex 750 boasts a robust yet lightweight design. The combination of high-quality plastics and metal components contributes to its durability, while the foldable structure makes it portable and convenient for travel. This practicality is further enhanced by the detachable cable, which allows for easy replacement in case of wear.

Another notable technology integrated into the Fostex 750 is the use of new acoustic engineering principles. These headphones feature a closed-back design that minimizes sound leakage and provides an immersive listening experience. This design is complemented by the innovative bass reflex system, which enhances low-end response without compromising clarity in other frequency ranges.

Overall, the Fostex 750 is an impressive headphone that combines advanced sound technology, comfort, and durability. Its dynamic drivers, ergonomic design, and acoustic engineering make it an ideal choice for both professional monitoring and casual listening. Whether you are mixing in a studio or enjoying music on the go, the Fostex 750 delivers an unmatched audio experience that is sure to satisfy even the most discerning listeners.