Aphex Systems 9251

Aphex Systems 9251

The 9251 is an Aural Exciter module which installs in one space of the Aphex Model 9000 rack or compatible dbx 900 series rack.

The Aural Exciter is an audio processor that provides many benefits to the user, including greatly improved presence and intelligibility without altering any other part of the audio system.

"SPR"™ (Spectral Phase Refractor) restores bass clarity and punch without any increase in amplitude by adjusting the phase relationshippf the fundamentals to the harmonics.

The "Drive" control of previous Aural Exciters has been eliminated. Adjustable Harmonics mixing generates a consistent amount of harmonics over a wide dynamic range.

WHY IT'S NEEDED

The audio reproduction process is far from perfect, even under the best of circumstances. Every step causes some degradation of the audio signal. What is happening involves the loss of some of the harmonics or overtones of the sound, the fragile parts that give it intelligibility. Equalizers cannot restore clarity and realism because they can only work on what's left of the original sound, often increasing noise and distortion in the attempt.

Although the initial impression of the Aural Exciter is often that it is some form of EQ, a comparison soon proves the difference. Equalizers are a static, fixed process, and they cannot boost what is no longer there. Equalizers can also add considerable power to the amplifier output, possibly causing amplifier clipping, speaker damage, ear fatigue and/or increased reverberation.

The Aural Exciter is a dynamic process that actually recreates the missing harmonic material and adds it back in the form of a very small cue signal. Because the enhancement signal is so small, it adds little power to the audio signal. It is easily reproduced, even by low quality systems, and is not affected by acoustic problems, such as "dead zones" or reverberant fields. Because the harmonics or overtones created are derived from the main signal and are musically and dynamically related, the result is very natural and pleasing to the ear, and sounds "correct"..

Aural Exciter is a proprietary process, patented worldwide and cannot be duplicated by any other means than a genuine Aural Exciter.

FEATURES

• For Aphex Modular System Model 9000 Series Rack or compatible dbx 900 Series rack
• Adjustable harmonics mixing
• SPR "Spectral Phase Refractor"
• Electronically Servo Balanced Inputs and Outputs
• Aphex VCA 1001 harmonics generator
• Operates with I/O levels from -10dBV to +8dBm
• Operated Balanced or Unbalanced automatically
• Solo function for effects return mixing
• All switch settings LED indicated

APPLICATIONS

• Recording Studio tracking and mixdowns - adds air, sparkle, and presence to voices and music; improves imaging
• Sound Reinforcement - Adds clarity and High Freq dispersion and penetration without increasing chance of feedback
• Sampling - Extends bandwidth and adds detail
• Film and Video - Restores clarity and intelligibility to dialog tracks, sound effects, and music
• AM Broadcasting - Provides the clarity and brightess of FM
• FM Broadcasting - Restores naturalness and openness lost due to processing

Specifications - Aphex Model 9251 Aural Exciter Module

INPUT

• Type Transformerless, RF Filtered, true instrumentation,
• differential servo-balanced
• Impedance 22k ohms balanced, 11k ohms unbalanced
• Maximum Input Level +27dBm
• Nominal Operating Level User selectable -10dBV, +4dBm
• CMRR greater than 60dB 20Hz to 10kHz

SIDECHAIN

• Harmonics Generator Aphex VCA1001

OUTPUT

• Type Transformerless, RF Filtered, differential Servo-Balanced
• Output Impedance 65 ohms
• Maximum Output Level +25dBm balanced, +21dBu unbalanced
• Bandwidth ±0.5dB 5Hz to 100kHz
• Dynamic Range 110 dB
• Unweighted Noise -86dBm, 20Hz - 20kHz
• THD @ +25dBm 0.01%
• IMD (SMPTE) @ +25dBm 0.01%

OTHER SPECIFICATIONS

• Power Requirements ±15VDC
• Power Consumption (max) 76 ma
• Dimensions Board: 4.5" H x 9.5" D;  Front Panel 5.25" H x 1.5" W
• Shipping Weight 1 lb