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Audio Accessories & Misc.

APHEX 108 Easyrider

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Item #:MO21977
Condition:Reference Item
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Model Description:
2-Channel Easyrider™ Auto Compressor

Model Details

The Model 108 is a two channel auto compressor incorporating the exclusive Easyrider technology for the best sounding, most transparent compression available. Unlike conventional compressors, the Easyrider thinks with you and for you, continuously monitoring the complexity of the program material and instantly adjusting the compression ratio and time constants accordingly. You'll find the Model 108 easy to use, simple and quick to set up. It sounds completely transparent on individual voices, instruments and submixes as well as full program material. So if you're looking for an extra hand in the studio, this may be just what you're looking for.


  • Wave Dependent Compressor™ (WDC) circuitry automatically adjusts time constants
  • No-Knee™ compression curve varies ratio automatically
  • Rotary speed control varies range of WDC release time
  • Dial up to 20dB compression
  • Gain reduction meter with 10 LED steps

Additional Detailed Information:

1. The DRIVE CONTROL adjusts input gain. Since the 108 has a fixed threshold, DRIVE not only sets the input sensitivity, it also drives the amount of compression action as it is adjusted clockwise.

2. The GAIN REDUCTION meter is a 10 segment LED bar indicating 2dB of gain reduction per segment for a maximum of 20dB.

3. When the PROCESS IN/OUT SWITCH is IN, the Easyrider circuit is engaged. Process OUT is a hardwire bypass.

4. The SPEED CONTROL adjusts the range of release times.

5. The OUTPUT CONTROL sets the output level after the desired amount of compression is set by the Drive control.

6. The POWER INDICATOR LED confirms power is connected to the unit.

7. Engage the STEREO LINK switch to link the VCA's in channels one and two. In this mode, the channel that has the most compression forces the same amount of gain reduction in the other channel.




(user selectable on back)+4dBu-10dBu
Connector:TRS 1/4 phone jacksame
Type:Transformerless, differential servo balancedsame
Impedance: Balanced20K-ohms13K-ohms
Impedance: Unbalanced6.5K-ohms6.5K-ohms
Nominal Level:+4dBu-10dBV (-7.8dBu)
Maximum Level:+29dBu+14dBV (+16.2dBu)
CMRR (typical):52dBsame
Connector:TRS 1/4 phone jacksame
Type:Single-ended, impedance balanced*
(may be used unbalanced)
Impedance: Balanced (SEIB*)120-ohms120-ohms
Impedance: Unbalanced56-ohms56-ohms
Nominal Level:+4dBu-10dBV (-7.8dBu)
Maximum Level:+22dBu+8dBV (+10.2dBu)
Frequency Response:±0.5dB 10Hz-30kHz
(-3dB points: 3Hz and 54kHz)
Dynamic Range:94dBsame
Hum and Noise: (unweighted 10Hz-22kHz)-72dB-83dB
Crosstalk (10Hz-22kHz @ max output)-80dBsame
THD with 10dB GR (Fastest Setting).26-%same
THD with 20dB GR (Fastest Setting).5-%same
THD with 10dB GR (Slowest Setting).03-%same
THD with 20dB GR (Slowest Setting).05-%same

Compression Parameters
Threshold:Fixed - Traditional threshold point is not definable due to No-Knee Compression curve
Ratio:The Easyrider No-Knee Compression Curve starts at 1.1:1 and ends at 5:1
Attack Time:Complex-Program (Waveform) Dependent
Release Time:Complex-Program (Waveform) Dependent
Input DRIVE Control Range:40dB
OUTPUT Control Range:30dB
Controls, Function Switches and Metering
(See panel illustration above)
Other Specifications
Power Requirements:Unit is powered by an external 24-volt, 600mA transformer (supplied with unit). Primary voltage, connectorization and agency listings of transformers supplied with units are appropriate for local power at points of destination.
Power Connector:2.5 mm "barrel" connector, located on rear panel; fits mating connector on transformer (see above).
Power Consumption (maximum):13watts
Dimensions:19" W x 1.75 " H x 5.75" overall depth, depth behind front panel: 4.5" Unit mounts in standard 19" rack, using 1 RU of vertical space.
Net Weights:Rack- mount chassis -3 lbs. external transformer -13.3 oz. (USA model)
Shipping Weight:5 lbs.

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