Sound Performance Lab Parametric Equalizer owner manual Introduction, Optimizer

INTRODUCTION

The OPTIMIZER is designed for both corrective and creative applications, producing effects impossible to achieve using conventional EQ.

Yet it remains very simple to operate.

Rather working out a theore- tically ideal filter response on paper, we have taken a more creative tack, experimenting directly with perceived sound across a wide range of fre- quencies.

The Optimizer provides a powerful, flexible and easy- to-operate means of equali- zing sound.

The Optimizer produces a smooth and linear phase res- ponse giving unsurpassed musicality and sonic transpa- rency

The advantage of proportional-Q is that it produces a more musical result and fine tuning of the filters is much easier.

Congratulations on purchasing the Optimizer, one of the most advanced and musical sounding parametric equalizer currently available.

The Optimizer is a highly specialized and creative equali- zer. In addition to familiar parametric functions, it features a range of modes that enable it to perform Band-pass, High- pass, Low-pass and Notch filtering. As you would expect from SPL - the company that developed the highly acclaimed Vitalizer psychoacoustic equalizer - the Optimizer is no ordi- nary equalizer. It excels in both corrective and creative applications and can produce many effects impossible to achieve using conventional parametric equalizers. Yet it remains very simple to operate.

The design of the Optimizer has been based on proven psychoacoustic principles and particular regard has been taken to the way the human hearing system perceives sound, at all stages of development. Rather working out a theoretically ideal filter response on paper and trying to emulate it, we have taken a more creative tack, experimen- ting directly with perceived sound across a wide range of fre- quencies.

The result of this creative work is an equalizer without equal, both technically and artistically. Not only does it pro- vide a powerful, flexible and easy-to-operate means of equa- lizing sound, but it boasts a noise level approaching the theoretical minimum for advanced analogue circuit design and a dynamic range even better than 18-bit digital systems.

The filter circuits are based on an advanced state-varia- ble filter topography which employs the "proportional-Q" principle, active output stages for each filter-band and the new "roll-off"-function to produce a smooth and linear phase response giving the Optimizer unsurpassed musicality and sonic transparency.

Rather than employing the standard "constant-Q" equali- zer design commonly used in sound reinforcement and room equalizers, the Optimizer works on the proportional-Q prin- ciple. The advantage of proportional-Q is that it produces a more musical result and fine tuning of the filters is much easier. The signal level is dependent of the bandwidth setting - eliminating the need for constant level readjustment when

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