SPECIFICATIONS
Electrical

Frequency Response: ±1dB from 20Hz to 20kHz
Dynamic Range: >90 dB "A" wtg., 20 Hz-22 kHz
Distortion (THD+N): <0.009% @1kHz, nominal level (-12 dBfs)
<0.005% @ peak level
Crosstalk: <90 dB below full scale
Power requirements: 9VAC, 13.5W (Alesis P4).

Physical
Dimensions: 19" x 1.75" x 6" (single rack space) Weight: 4.2 lbs.

Inputs
Number of Channels: 2
Format: 1/4" TRS 3-conductor jacks, balanced/unbalanced
Nominal Level: -20 dBV to +4 dBu, front-panel adjustable
Maximum Input Level: +19dBu
Input Impedance (nominal): 500K unbalanced, 20K balanced

A/D - D/A Conversions
A/D converter: 16 bit Sigma-Delta, 128 times oversampling
D/A converter: 18 bit Delta-Sigma, 64 times oversampling
Sampling Frequency: 48kHz (variable from 40.4 kHz to 50.8 kHz
under external control)

Outputs
Number of Channels: 2
Format: 1/4" TRS 3-conductor jacks, servo balanced/unbalanced
Maximum Level: +17.5dBu
Nominal Level: -20 dBV to +4 dBu, front-panel adjustable
Output Impedance (nominal): 500 ohms

Digital Input/Output
Input and Output Type: ADAT MultiChannel Optical Digital Interface
(AES/EBU and S/PDIF formats available using optional AI-1 Digital Interface and Sample Rate Converter)
48 kHz In: BNC jack for word clock connection to BRC, AI-2, or AI-1
Number of Channels: 2 (selectable to/from any of the 8 ADAT Optical channels)
Connectors: EIAJ fiber optic jacks

Processing and Memory
User Programs (RAM): 100
Factory Preset Programs (ROM): 100
Internal processing resolution: 24 bit accumulator
Delay memory: 5 seconds
EQ effects: Lowpass Nonshelving, Bandpass Nonshelving,
Highpass Nonshelving, Lowpass Shelving,
Bandpass Shelving Low & High, Highpass
Shelving, 2-Band Sweepable, 3-Band
Parametric, 4-Band Parametric, 5-Band Graphic,
1-Band Resonator, Mono Tremolo, Stereo
Tremolo, Pseudo Stereo Expander
Pitch effects: Mono Chorus, Stereo Chorus, Quad Chorus,
Mono Flanging, Stereo Flanging, Phasor, Mono
Lezlie, Stereo Lezlie, Pitch Shift, Pitch Detune,
Ring Modulator
Delays: Mono Delay, Stereo Delay, Ping Pong Delay,
Multi Tap Delay, Tap Tempo Mono Delay, Tap
Tempo Ping Pong Delay
Reverbs: Mono Room, Room 1, Hall 1, Plate 1, Chamber
1, Room 2, Hall 2, Plate 2, Chamber 2, Large
Plate, Large Room, Spring, Nonlinear, Reverse

Front Panel
Controls Input Level (Left/Right)
Output
Keypad Program Store
Compare Bypass
Type Global
Routing Name
Parameter MIDI
Mix Modulation
Indicators Dual, 4-stage LED VU meters
Custom LCD display

Rear Panel
Input (Left and Right) 1/4" 3-conductor
Output (Left and Right) 1/4" 3-conductor
Bypass 1/4" (accepts normally open or normally closed
momentary switches, such as the Alesis PD)
Advance 1/4" (as above)
Digital (In and Out) EIAJ fiber optic cable jacks (Toslink connectors)
MIDI (In and Out/Thru) 5 pin DIN
Power 4 pin Barrel