Installation

Model 750

telephone numbers, and left and right channel identifiers can easily be sent. The voice audio source is selectable, with the choices being either the internal micro- phone or an externally-connected signal.

The setup section also contains a digitally- controlled sine-wave generator which, under software control, produces a “0-level” single-tone reference and multi- step tone sequences. The single-tone output is selectable for either 400Hz or 1kHz—the two industry-standard frequen- cies. The tone sequences allow frequency response testing of a transmission chain, with the choice of either a basic or an advanced sequence. In the basic setting

a1kHz “0-level” reference is generated, followed by individual 10kHz, 1kHz, and 100Hz tones. In the advanced setting a 1kHz reference is generated, followed by 14 individual tones, ranging from 15kHz to 50Hz. At the end of each sequence a left/ right channel identifier is generated. It consists of a short burst of 700Hz sent only to the left channel, followed by two short bursts of 700Hz to the right channel.

While the voice and tone setup signals can be assigned to the main and AUX output buses, a direct line-level stereo output is also provided. This allows the generation of setup and test signals without interfer- ing with normal operation of the main and AUX audio buses.

Talk Back

The Model 750 includes a “talk back” function. Two push-button switches allow the selected voice source to be routed to the setup direct output and/or the main and AUX outputs.

Mounting, Connectors, and Mains

While the Model 750 is loaded with fea- tures, it only requires two spaces in a standard 19-inch rack. XLR-type and ¼-inch 3-conductor audio connectors are used for audio interconnection. Mains power is factory configured for 100, 120, or 220/240V, 50/60Hz.

In this section you will be installing the Model 750 Audio Mixer in an equipment rack. Input and output connections will be made using the Model 750’s multitude of jacks. AC mains power will then be connected.

During normal operation, no access to the back panel of the Model 750 is required. However, there are five trim potentiom- eters that may need to be adjusted prior to the Model 750 going into service, depend- ing on the requirements of the specific installation. Since part of the calibration process involves observing the front- panel-mounted VU meters, you may want to perform the calibration process “on-the- bench,” prior to mounting the Model 750 in an equipment rack. In addition, there are a number if DIP switches that may need to be set. Refer to the Configuration section of this guide for details.

Realistically, as long as you can get the assistance of another person for about

5 minutes, go ahead and install the Model 750, wire it up, and then worry about the calibration. You will need a highly-skilled and articulate helper, capable of describ- ing the position of the VU meters’ indica- tors with words such as: “too high,” “down a little,” “almost,” “up a tad,” and “OK—you’ve got it!”

Issue 3, May 1997	Model 750 User Guide
Page 10	Studio Technologies, Inc.

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.