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*Please note -- This pre-owned item may show signs of use. Please refer to the photos for details of the product.
The Aphex Expressor Model 651 is a professional single-channel compressor/limiter designed to provide precise dynamic control while preserving the clarity, punch, and natural character of the original audio signal. Featuring fully adjustable input, threshold, ratio, attack, release, and output controls, the Expressor offers extensive flexibility for recording, mixing, mastering, and broadcast applications.
What sets the Model 651 apart is its combination of Aphex's proprietary High Frequency Expander (HFX) and Spectral Phase Refractor (SPR) technologies. HFX helps compensate for the high-frequency dullness commonly associated with heavy compression, while SPR enhances low-frequency clarity and punch without increasing bass amplitude. Additional features include selectable hard- and soft-knee compression, sidechain processing, a low-frequency sidechain filter, and stereo linking capabilities. With servo-balanced audio connections and comprehensive metering, the Aphex Expressor 651 delivers versatile, transparent dynamics processing for professional studio environments.
| Product Name | Aphex Expressor Model 651 Single Channel Compressor/Limiter |
|---|---|
| Brand | Aphex |
| Condition | Pre-Owned |
| MPN | MODEL651 |
| Shipping Option | Free Shipping to the Continental U.S. |
What's in the Box?
- Aphex Expressor Model 651 Single Channel Compressor/Limiter
- Single-channel professional compressor/limiter for studio and broadcast applications
- Aphex High Frequency Expander (HFX) preserves high-frequency detail during heavy compression
- Spectral Phase Refractor (SPR) enhances bass clarity and punch without increasing amplitude
- Fully adjustable input, threshold, ratio, attack, release, and output controls
- Selectable hard-knee and soft-knee compression characteristics
- Wide compression ratio range from 1.1:1 to 50:1
- Manual attack and release controls for precise dynamic shaping
- External sidechain access for customized compression control
- Switchable low-frequency sidechain filter helps prevent excessive gain reduction from bass-heavy signals
- Stereo linking capability when connecting two Expressor units
- Master/slave operation for linked processing configurations
- Servo-balanced XLR input and output connections
- Input and output level metering with gain-reduction monitoring
- Process bypass switching for convenient signal comparison
- Compact 1U rackmount chassis
| Product Type | Single-Channel Compressor/Limiter |
| Channels | 1 |
| Compression Ratio | 1.1:1 to 50:1 |
| Threshold Range | -20 dB to +20 dB |
| Attack Time | 0.05 ms to 100 ms |
| Release Time | 40 ms to 4 seconds |
| Compression Knee | Selectable Hard Knee / Soft Knee |
| Processing Modes | Manual Compression and Automatic Processing |
| High-Frequency Processing | Aphex High Frequency Expander (HFX) |
| Bass Enhancement Technology | Spectral Phase Refractor (SPR) |
| Sidechain Processing | External Sidechain Access |
| Sidechain Filter | Switchable Low-Frequency Cut |
| Stereo Linking | Yes, using two linked Expressor units |
| Input Impedance | 22 kΩ |
| Output Impedance | 65 Ω |
| Maximum Input Level | +27 dBm |
| Maximum Output Level | +25 dBm |
| Dynamic Range | 112 dB |
| Nominal Operating Level | +4 dBu |
| Audio Inputs | 1 × Servo-Balanced XLR |
| Audio Outputs | 1 × Servo-Balanced XLR |
| Sidechain Connections | 1/4-inch phone jack |
| Controls | Input, Threshold, Ratio, Attack, Release, Frequency, Output, Sidechain |
| Metering | Output Level Meter and Gain Reduction Meter |
| Bypass | Process On/Off |
| Rack Format | 1U |
| Dimensions (W × H × D) | 19 × 1.75 × 8.6 inches |
*Please note -- This pre-owned item may show signs of use. Please refer to the photos for details of the product.
The Aphex Expressor Model 651 is a professional single-channel compressor/limiter designed to provide precise dynamic control while preserving the clarity, punch, and natural character of the original audio signal. Featuring fully adjustable input, threshold, ratio, attack, release, and output controls, the Expressor offers extensive flexibility for recording, mixing, mastering, and broadcast applications.
What sets the Model 651 apart is its combination of Aphex's proprietary High Frequency Expander (HFX) and Spectral Phase Refractor (SPR) technologies. HFX helps compensate for the high-frequency dullness commonly associated with heavy compression, while SPR enhances low-frequency clarity and punch without increasing bass amplitude. Additional features include selectable hard- and soft-knee compression, sidechain processing, a low-frequency sidechain filter, and stereo linking capabilities. With servo-balanced audio connections and comprehensive metering, the Aphex Expressor 651 delivers versatile, transparent dynamics processing for professional studio environments.
| Product Name | Aphex Expressor Model 651 Single Channel Compressor/Limiter |
|---|---|
| Brand | Aphex |
| Condition | Pre-Owned |
| MPN | MODEL651 |
What's in the Box?
Aphex Expressor Model 651 Single Channel Compressor/Limiter- Single-channel professional compressor/limiter for studio and broadcast applications
- Aphex High Frequency Expander (HFX) preserves high-frequency detail during heavy compression
- Spectral Phase Refractor (SPR) enhances bass clarity and punch without increasing amplitude
- Fully adjustable input, threshold, ratio, attack, release, and output controls
- Selectable hard-knee and soft-knee compression characteristics
- Wide compression ratio range from 1.1:1 to 50:1
- Manual attack and release controls for precise dynamic shaping
- External sidechain access for customized compression control
- Switchable low-frequency sidechain filter helps prevent excessive gain reduction from bass-heavy signals
- Stereo linking capability when connecting two Expressor units
- Master/slave operation for linked processing configurations
- Servo-balanced XLR input and output connections
- Input and output level metering with gain-reduction monitoring
- Process bypass switching for convenient signal comparison
- Compact 1U rackmount chassis
| Product Type | Single-Channel Compressor/Limiter |
| Channels | 1 |
| Compression Ratio | 1.1:1 to 50:1 |
| Threshold Range | -20 dB to +20 dB |
| Attack Time | 0.05 ms to 100 ms |
| Release Time | 40 ms to 4 seconds |
| Compression Knee | Selectable Hard Knee / Soft Knee |
| Processing Modes | Manual Compression and Automatic Processing |
| High-Frequency Processing | Aphex High Frequency Expander (HFX) |
| Bass Enhancement Technology | Spectral Phase Refractor (SPR) |
| Sidechain Processing | External Sidechain Access |
| Sidechain Filter | Switchable Low-Frequency Cut |
| Stereo Linking | Yes, using two linked Expressor units |
| Input Impedance | 22 kΩ |
| Output Impedance | 65 Ω |
| Maximum Input Level | +27 dBm |
| Maximum Output Level | +25 dBm |
| Dynamic Range | 112 dB |
| Nominal Operating Level | +4 dBu |
| Audio Inputs | 1 × Servo-Balanced XLR |
| Audio Outputs | 1 × Servo-Balanced XLR |
| Sidechain Connections | 1/4-inch phone jack |
| Controls | Input, Threshold, Ratio, Attack, Release, Frequency, Output, Sidechain |
| Metering | Output Level Meter and Gain Reduction Meter |
| Bypass | Process On/Off |
| Rack Format | 1U |
| Dimensions (W × H × D) | 19 × 1.75 × 8.6 inches |
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