Model | Fostex 750 instruction

Model 750

Be Warned! The easiest means of getting a very quiet recording is to have DIP switch 1 set to EXT, while having no exter- nal audio signal connected! (During initial testing of the Model 750 the guys in Studio Technologies’ lab did this more than once, causing high-SPL howls of “what hap- pened—the recording section doesn’t work anymore.”)

To keep other audio signals from interfer- ing with the record audio, the Model 750’s monitor speaker output is automatically muted whenever recording is taking place. (During initial testing, it was found that this muting feature was also very useful in an unintended way; providing an audible “marker” as to when to begin talking.)

Using the Play Functions

Three buttons are associated with the setup section’s play functions. Adjacent to each button is an LED indicator that lights whenever its respective function is active. The uniqueness of the setup section is highlighted by the use of blue LEDs, a rarity that we think adds a bit of “cool- ness” to the Model 750!

It is important to understand the operating differences between when only one of the play buttons has be set to the on (in) position, and when more than one has been set to the on position. When only one button has been selected, the function associated with that button will operate continuously. When more than one button has been selected, the selected functions will alternate according to a pre-pro- grammed schedule.

Remember, the setup section has a direct audio output. This means that any time one of the play functions is active, an audio signal will be present on the setup

direct output. The active audio signal will only be connected to the main and/or AUX buses if their respective bus assignment buttons are enabled. In the following paragraphs it is assumed that these but- tons have be set to their desired positions.

Voice Play

If the button labeled VOICE is the only one selected, playback of the L+R, L Only, and R Only voice segments will occur in a continuous sequence. The L+R voice segment will play first, connecting the recorded audio to both the left and right channels. After a 1-second pause, the L Only voice segment will connect to the left channel, with silence on the right channel. After another 1-second pause, the R Only voice segment will connect to the right channel, with silence on the left channel. After a 2-second pause the L+R voice segment will again play. And so it goes…

If a voice segment has been electronically marked as erased, it will be skipped from the playback sequence. If all three seg- ments have been “erased,” then the voice play status LED will flash in a 1-second- on/1-second-off cadence whenever the play function is enabled.

Single Tone Play

If the button labeled SINGLE TONE is the only one selected, a continuous 400Hz or 1kHz sine-wave signal will be connected to both the left and right channels. Con- figuration DIP switch 4 is used to select whether 400Hz or 1kHz will be generated.

Multi-Tone Play

If the button labeled MULTI-TONE is the only one selected, a pre-configured sequence of sine-wave signals will play continuously, each complete sequence

Model 750 User Guide	Issue 3, May 1997
Studio Technologies, Inc.	Page 29

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.