API 525 Compressor

$1,230.25

Originally released in the 70’s, the API 525 is a “feedback” type compressor. An input (threshold) control and output (make-up gain) control are provided, along with an additional “Ceiling” fine-tune function which can increase gain reduction (lower threshold) while simultaneously raising output level to match, so the user can alter dynamics “on the fly” without level changes. A compression/limit switch sets ratio at either 2:1 or 20:1. Attack time is as fast as 15u/s. Four auto release modes are offered via two switches, 0.1s, 0.5s, 1.5s, & 2.0s. A De-Ess function inserts an inverse vocal energy curve filter in the detector for effective sibilance/pop reduction. The 525 design has been taken from the original blue prints and spec control drawings from the API archives.

Originally released in the 70’s, the API 525 is a “feedback” type compressor. An input (threshold) control and output (make-up gain) control are provided, along with an additional “Ceiling” fine-tune function which can increase gain reduction (lower threshold) while simultaneously raising output level to match, so the user can alter dynamics “on the fly” without level changes. A compression/limit switch sets ratio at either 2:1 or 20:1. Attack time is as fast as 15u/s. Four auto release modes are offered via two switches, 0.1s, 0.5s, 1.5s, & 2.0s. A De-Ess function inserts an inverse vocal energy curve filter in the detector for effective sibilance/pop reduction. The 525 design has been taken from the original blue prints and spec control drawings from the API archives.

Additional Information

Originally released in the 70’s, the API 525 is a “feedback” type compressor. An input (threshold) control and output (make-up gain) control are provided, along with an additional “Ceiling” fine-tune function which can increase gain reduction (lower threshold) while simultaneously raising output level to match, so the user can alter dynamics “on the fly” without level changes. A compression/limit switch sets ratio at either 2:1 or 20:1. Attack time is as fast as 15u/s. Four auto-release modes are offered via two switches: 0.1s, 0.5s, 1.5s, & 2.0s. A De-Ess function inserts an inverse vocal energy curve filter in the detector for effective sibilance/pop reduction. The 525 design has been taken from the original blue prints and spec control drawings from the API archives.

Release times vary with frequency, with high frequency / full bandwidth content released faster than lower frequencies for natural envelope tracking. Attack time is fixed, chosen to catch the fastest peaks without “pumping.” Equally useful as a tracking, mixdown, or program compressor/limiter, the 525 utilizes “vintage” dynamics control and an easy-to-use multi-function control set. The 525 has a hard-wire bypass switch, a balanced input, and a pinout that is the same as all the other 500 series modules. Two or more 525s can be linked for multi-channel compression.

The API 525 Compressor makes use of the 2510 and 2520 op-amps and exhibits the reliability, long life, and uniformity which are characteristic of all API products.

Features

    • Exact reissue of API’s original 525 from the early 70’s
    • Peak detecting “feedback” compressor/limiter
    • Variable Threshold and Output levels
    • Unique “Ceiling” control combines key functions
    • Analog VU meter for monitoring gain reduction
    • 4 Switchable release modes
    • De-Ess function
    • Traditional API fully discrete circuit design
    • Active Balanced Input/Output
    • Hardwire bypass

Specifications

    Connector: API 500 Edge Connector – VPR Alliance Compliant
    Input Impedance: 60K Ohms, Balanced
    Output Impedance: 75 Ohms, Transformer coupled, Balanced
    Maximum Input Level: +27 dBu
    Maximum Output Level: +28 dBu
    Attack Time: 15 micro seconds
    Release Time: 0.1, 0.5, 2.0, 2.5 seconds
    Slopes: Compression 2:1, Limit 20:1
    Maximum Gain Reduction: 25 dB
    Metering: Illuminated Analog Gain Reduction dB meter
    Frequency Response: ±0.5 dB, 20 Hz to 40 kHz
    Signal to Noise Ratio: 112 dB
    Power Consumption: 3 Watts – VPR Alliance Compliant
    Unit Size: 1.5″ X 5.25″ X 7″
    Shipping Size: 4.5″ X 6.5″ X 10″
    Unit Weight: 1.8 lbs.
    Shipping Weight: 2.2 lbs.

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Originally released in the 70’s, the API 525 is a “feedback” type compressor. An input (threshold) control and output (make-up gain) control are provided, along with an additional “Ceiling” fine-tune function which can increase gain reduction (lower threshold) while simultaneously raising output level to match, so the user can alter dynamics “on the fly” without level changes. A compression/limit switch sets ratio at either 2:1 or 20:1. Attack time is as fast as 15u/s. Four auto-release modes are offered via two switches: 0.1s, 0.5s, 1.5s, & 2.0s. A De-Ess function inserts an inverse vocal energy curve filter in the detector for effective sibilance/pop reduction. The 525 design has been taken from the original blue prints and spec control drawings from the API archives.

Release times vary with frequency, with high frequency / full bandwidth content released faster than lower frequencies for natural envelope tracking. Attack time is fixed, chosen to catch the fastest peaks without “pumping.” Equally useful as a tracking, mixdown, or program compressor/limiter, the 525 utilizes “vintage” dynamics control and an easy-to-use multi-function control set. The 525 has a hard-wire bypass switch, a balanced input, and a pinout that is the same as all the other 500 series modules. Two or more 525s can be linked for multi-channel compression.

The API 525 Compressor makes use of the 2510 and 2520 op-amps and exhibits the reliability, long life, and uniformity which are characteristic of all API products.

Features

    • Exact reissue of API’s original 525 from the early 70’s
    • Peak detecting “feedback” compressor/limiter
    • Variable Threshold and Output levels
    • Unique “Ceiling” control combines key functions
    • Analog VU meter for monitoring gain reduction
    • 4 Switchable release modes
    • De-Ess function
    • Traditional API fully discrete circuit design
    • Active Balanced Input/Output
    • Hardwire bypass

Specifications

    Connector: API 500 Edge Connector – VPR Alliance Compliant
    Input Impedance: 60K Ohms, Balanced
    Output Impedance: 75 Ohms, Transformer coupled, Balanced
    Maximum Input Level: +27 dBu
    Maximum Output Level: +28 dBu
    Attack Time: 15 micro seconds
    Release Time: 0.1, 0.5, 2.0, 2.5 seconds
    Slopes: Compression 2:1, Limit 20:1
    Maximum Gain Reduction: 25 dB
    Metering: Illuminated Analog Gain Reduction dB meter
    Frequency Response: ±0.5 dB, 20 Hz to 40 kHz
    Signal to Noise Ratio: 112 dB
    Power Consumption: 3 Watts – VPR Alliance Compliant
    Unit Size: 1.5″ X 5.25″ X 7″
    Shipping Size: 4.5″ X 6.5″ X 10″
    Unit Weight: 1.8 lbs.
    Shipping Weight: 2.2 lbs.

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