User manual GML GML8200

[. . . ] Specifically, the 8200 provides complete control over a wide frequency range and "Q" setting, along with 15 dB of cut or boost on five individual bands, with the front panel controls for frequency and "Q" mounted concentrically. The addition of the "Q" characteristic represents the foremost advance in equalizer technology since the invention of the transistor as a replacement for bulky and noisy vacuum tubes, and empowers the user to maintain precise and musical control over the tonal attributes of the spectrally processed signal. (Graphical representation of the Q characteristic and gain steps may be found in Appendix A of this manual. ). The availability of up to 15 dB of gain or attenuation is significant in the audio world, since most contemporary equalizers offer at most 12 dB of cut or boost, and usually not over such flexible overlapping multiple bands. Thus, it is possible to achieve any particular "sound" that is desired, no matter if the goal is a subtle alteration or an audible coloration effect. [. . . ] The Chassis Ground terminal gives a common point of continuity for the chassis. This terminal is normally tied to the Electronics Ground terminal (D); however, in certain situations it may be advantageous and/or necessary to keep these ground references independent (to eliminate ground loops in some installations, for instance). The Output Warning sticker reminds users of the inherent danger and imminent damage associated with shorting the output. Normally, this denotes that pin 2 is wired as the hot output pin; however, older units and custom-order units may be wired pin 3 hot. Power Supply Pin-Out Legend reveals the appropriate voltages from the external power supply. Power Supply Throughput is a 5-pin XLR connector that allows a second unit to be connected to the same external power supply without the need for a "Y" cable. The Ground Strap normally connects electronics ground and chassis ground; however, it may be removed by the user if it is thought to be beneficial for a particular installation. J. The GML Serial Number Tag contains a permanent imprint of the unit's assigned serial number. The CE (European Electromagnetic Compatibility) marking indicates full compliance with EN 55013:1990 (Electromagnetic Disturbance, Sects. 4. 3, 5. 4, 6. 2, 7. 0, 8. 0). DESIGN Though the front panel controls seem very intuitive to the initiated and experienced audio engineer, the circuit design behind these controls is anything but simple and straightforward. The GML 8200 features exemplary input and output buffering circuits in addition to the actual equalization circuits. It is important to keep in mind that all circuits in any device necessarily alter the sonic character of any complex signal, though these colorations have been meticulously minimized in the design of the 8200. Many contemporary equalizer designs are not sensitive or wary of this aspect of audio electronics and thus require some amount of alteration to compensate for this additional spectral signature induced by the unit itself. Interestingly, care has also been taken--as in all aspects of the GML 8200--to select the highest quality components, from the potentiometers on the front panel to the smallest passive elements. This attention to detail partially elucidates the quality found in the GML 8200 Parametric Equalizer. These component choices, coupled with superior design and a proclivity towards innovation, combine to make the GML 8200 Parametric Equalizer the most powerful, flexible, and transparent equalizer ever designed. Another feature that distinguishes the GML 8200 from the myriad of other commercially available equalizers is its inherent dynamic range, which allows for the addition of 15 dB of gain in multiple frequency bands simultaneously without even a hint of distortion or loss of detail and authority. This amazing power is due in large part to the GML propensity to design all audio circuits from discrete components. Discrete designs, when executed properly, help to preserve not only sonic integrity and musicality, but also to allow for the widest dynamic range through the entire signal path, thus eliminating many sonic compromises and limitations. Not only do these discrete structures--and the GML 9202 discrete opamp in particular--sound better than their integrated counterparts, they also offer the ability to design for higher signal levels internally, while also optimizing dynamic range by providing a low noise floor. An additional benefit of the discrete circuit topology used in the GML 8200 Parametric Equalizer is increased bandwidth. Not only does this significant extension--of both high and low frequencies--provide for more detail and realism; it also ensures a greater degree of linearity in the traditional audio spectrum (20 Hz to 20 kHz) by locating bandwidth poles superceding these commonly-accepted limits. [. . . ] Opening the case of the unit will break several manufacturing seals and void the GML warranty--these security measures cannot be readily detected nor easily thwarted, and should be respected wholeheartedly. These measures also act to protect the intellectual property of GML so that we may continue to design the best high-end professional analog audio peripherals. CONTACTS General Information: GML, LLC. Box 1366 Franklin, TN 37065 615. 790. 1016 (ph) 615. 794. 4802 (fax) internet:: www. massenburg. com Repairs: GML, LLC. Franklin, TN 37064 615. 790. 1016 (ph) 615. 794. 4802 (fax) Engineering: GML, LLC. [. . . ]