Fostex 750 manual Model

Page 30

Model 750

The monitor source push-button switches were chosen to allow more than one source to be selected at a time. The ability to simultaneously depress and lock mul- tiple buttons is not a “glitch,” but is a fea- ture which can prove useful in some specialized situations. An example is where

a“mix-minus” cue signal from a remotely- located facility is being returned to the Model 750 by means of external monitor input 1. By selecting both EXT 1 and main stereo, a composite signal is created for monitoring.

Monaural Function

A function is provided that allows the sel- ected monitor source to be combined to form a monaural signal. The monaural fun- ction is useful for checking a stereo audio signal’s “image” across the left/right field, as well as determining its monaural com- patibility. When the stereo/mono button is in the mono (in) position, the left and right channels of the monitor source are com- bined (summed) and the level of the sum- med signal is dropped by 6dB. The 6dB level reduction is a standard part of the monaural function on virtually all audio consoles, preventing level buildup caused by the summing of phase coherent signals.

The monaural function does not impact the main and AUX audio buses, affecting only the monitor speaker output, headphone output, and the meters. Note that the monaural function effects the monitor source selected by the push-button switches, as well as, if configured and active, the AUX interrupt signal.

Metering

Two VU-type meters and associated LEDs are provided for visual level monitoring. The meters provide the operator with an

excellent sense of the average signal level, while the LEDs display peak signal condi- tions. A “peak” LED lights whenever the level of the signal being monitored reaches within 6dB of the maximum inter- nal bus level. In the “real world,” audio material with large transient information may only display a moderate signal level on the VU meters. While the fast response time of the peak LEDs will allow the pres- ence of such transients to be displayed.

Apush-button switch, located at the top of the monitor section, allows the audio source for the meters to be selected.

When the button is in the main (out) posi- tion the left channel of the main audio bus is sent to the left meter, the right channel of the main audio bus is sent to the right meter. When the button is in the monitor (in) position the monitor source selected for the speaker and headphone outputs is connected to the meters. Reviewing the ramifications of the meter source button may prove useful; we do so in the follow- ing paragraphs:

Allowing the meters to directly monitor the main audio bus is provided for operator peace-of-mind. It allows a continuous display of what is, in most situations, the “on-air” audio bus, no matter what is happening in the monitor section. Note that when the meter source button is set to the main (out) position, use of the stereo/ mono button will have no impact on the meters. Activation of the AUX interrupt function won’t affect the meters either.

With the meters selected to observe the monitor source, great flexibility is possible. However, unless a full understanding of how the meters function in this mode is gained, the flexibility can be accompanied by confusion!

Model 750 User Guide

Issue 3, May 1997

Studio Technologies, Inc.

Page 33

Page 29 Page 31
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Page 29 Page 31
Contents Model Table of Contents Foreword Introduction What This User Guide CoversSystem Features Model Installation Audio Inputs and Outputs Locating the UnitMounting Mic/Line InputsStereo Line Inputs Main OutputsConfigurable Outputs Setup Direct OutputAUX Output External Monitor Inputs Monitor OutputConnecting AC Mains Power Record/Talk Back External Audio InputConfiguration Model External Record/TB Audio Source VU Meter Calibration Model Configuration DIP Switches REC/TB Audio Source EXT / INTREC L ONLY/R only Disable / Enable Operation Model Model Detail of front panel showing setup section Setup Functions Model Model Master Output Detail of front panel showing master output sectionMonitor Section Detail of front panel showing monitor sectionModel Model Model Practical Operating Tips Technical Notes Model Specifications LED Appendix A-1. Basic Multi-Tone Sequence Appendix A-2. Advanced Multi-Tone Sequence Page Page Page Page Page

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.
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