Fostex 750 manual Model

Page 34

Model 750

Faux VU Meters

In the spirit of George Washington (and to make our mother proud of us) we have to “tell the truth” and admit that while the meters selected for the Model 750 are of very good quality, they don’t meet the specifications of a “true” VU meter. So why was a less-than-perfect meter se- lected for the Model 750? The answer is easy and not surprising. While the Model 750’s existing meter is already quite ex- pensive, being built in England by a top- notch meter manufacturer, the cost for

a “true” VU meter is about five times as much!

The technical difference between the meter used on the Model 750 and a “true” VU meter lies in the ballistic characteris- tics, i.e. how the pointer accelerates and decelerates in response to audio signals. The Model 750’s meter pointer moves very close to, but not exactly in the manner required to be “perfect.”

For the Model 750 operator, the selected meter provides a completely acceptable indication of level. But as a technically- oriented company, we wanted to “come clean” about our actions. Too bad so many other audio companies don’t tell you that their “VU meters” are fakes— many don’t even come close to meeting the specs!

VU Meter Calibration

From the factory the VU meters are cali- brated so that a +4dBu signal level, as measured on main output 1, results in a reading of 0 VU on the meters. (The meter source button is set to the monitor (in) position and the source is selected to

be main stereo.) However, it may be observed that the meters may no longer

be precisely calibrated when the meter source button is set to the main (out) position. (In this position the main audio bus is directly connected to the meters.) A difference of up to 0.5dB from the cali- brated value could be expected. This is due to tolerance variations in the compo- nents of the monitor circuitry. In reality, only when a steady tone is present on the main audio bus will this variation become apparent. During actual operation it un- likely to become a factor.

Model 750 User Guide

Issue 3, May 1997

Studio Technologies, Inc.

Page 37

Page 33 Page 35
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Page 33 Page 35
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 OutputsSetup Direct Output Configurable OutputsAUX 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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