In 2-way stereo mode the controls are marked in black BELOW the horizontal black line.Channel One and Channel Two functions are identical in the stereo mode. Front panel controls not described in this section are not active in stereo 2-way operation.

[1] & [5] Input Gain Controls the INPUT level with +/- 12 dB of gain.

[2] & [6] Low/Mid* Selects crossover point between the LOW and HIGH outputs.

[3] & [7] Low Output Controls the Low frequency output level with a range of -∞ to +6 dB.

[4] & [8] High Output Controls the High frequency output with a range of -∞ to +6 dB.

[9] & [14] Low Cut Switch for selecting the 40 Hz high pass filter. An LED indicates the selection.

[10] & [15] x10 LED Indicates that the LOW/HIGH crossover frequency range is 450 Hz to 9.6 kHz.

[11] & [16] Phase Invert Switch for reversing the polarity on the LOW Output. An LED indicates that the phase is inverted.

[12] & [17] Phase Invert Switch for reversing the polarity on the HIGH Output. An LED indicates that the phase is inverted.

[13] Stereo LED indicating stereo mode operation.

*although this control is labeled as “Low/Mid”, it operates as the crossover frequency control between low and high frequencies in stereo 2-way operation.

Stereo 3-way Mode:

In 3-way stereo operation the controls are marked in black BELOW the horizontal black line. Channel One and Channel Two functions are identical in the stereo mode. LEDs are disabled for controls which are non-functional in this mode.

[1] & [7] Input Gain Controls the INPUT level with +/- 12 dB of gain.

[2] & [8] Low/Mid Selects crossover point between LOW and MID frequencies.

[3] & [9] Mid/High Selects crossover point between MID and HIGH frequencies.

[4] & [10] Low Output Controls the Low Frequency output level with a range of -∞ to +6 dB.

[5] & [11] Mid Output Controls the Mid Frequency output with a range of -∞ to +6 dB.

[6] & [12] High Output Controls the High Frequency output with a range of -∞ to +6 dB.

[13] & [19] Low Cut Switch for selecting the 40 Hz high pass filter. An LED indicates the selection.

[14] & [20] x10 LED Indicates that the LOW/MID crossover frequency range is 450 Hz to 9.6 kHz.

[15] & [21] Phase Invert Switch for reversing the polarity on the LOW Output. An LED indicates the selection.

[16] & [22] Phase Invert Switch for reversing the polarity on the MID Output. An LED indicates the selection.

[17] & [23] Phase Invert Switch for reversing the polarity on the HIGH Output. An LED indicates the selection.

[18] Stereo LED indicating stereo mode operation.

Mono 4-way Mode:

In 4-way mono operation the controls are marked in red ABOVE the horizontal black line. Front panel controls not described in this section are not active in mono 4-way mode. LEDs are disabled for controls which are non-functional in mono 4-way mode.

[1] Input Gain Controls the INPUT level with +/- 12 dB of gain.

[2] Low/Low-Mid Selects crossover point between LOW and LOW-MID frequencies.

[3] Low-Mid/High-Mid Selects the crossover point between LOW-MID and HIGH-MID frequencies.

[4] Low Output Controls the LOW frequency output level with a range of -∞ to +6 dB.

[5] Low-Mid Output Controls the LOW-MID frequency output level with a range of -∞ to +6 dB.

[6] High-Mid/High Selects the crossover point between HIGH-MID and HIGH frequencies.

[7] High-Mid Output Controls the HIGH-MID frequency output level with a range of -∞ to +6 dB.

[8] High Output Controls the HIGH frequency output level with a range of -∞ to +6 dB.

[9] Low Cut Switch for selecting the 40 Hz high pass filter. An LED indicates the selection.

[10] x10 LED Indicates that the LOW/LOW-MID crossover frequency range is 450 Hz to 9.6 kHz.

[11] Phase Invert Switch for reversing the polarity on the LOW Output. An LED indicates the selection.

[12] Phase Invert Switch for reversing the polarity on the LOW-MIDOutput. An LED indicates the selection.

[13] Mono LED indicating mono mode operation.

[14] Phase Invert Switch for reversing the polarity on the HIGH-MID Output. An LED indicates the selection.

[15] Phase Invert Switch for reversing the polarity on the HIGH Output. An LED indicates the selection.

Mono 3-way Mode:

In 3-way mono operation the controls are marked in red ABOVE the horizontal black line.

Front panel controls not described in this section are not active in mono 3-way mode. LEDs are disabled for controls which are non-functional in this mode.

[1] Input Gain Controls the input level with +/- 12 dB of gain.

[2] Low/Mid Selects crossover point between LOW and MID frequencies.

[3] Low Output Controls the LOW frequency output level with a range of -∞ to +6 dB.

[4] Mid/High Selects the crossover point between MID and HIGH frequencies.

[5] Mid Output Controls the MID frequency output level with a range of -∞ to +6 dB.

[6] High Output Controls the HIGH frequency output level with a range of -∞ to +6 dB.

[7] Low Cut Switch for selecting the 40 Hz high pass filter. An LED indicates the selection.

[8] x10 LED Indicates that the LOW/MID crossover range is 450 Hz to 9.6 kHz.

[9] Phase Invert Switch for reversing the polarity on the LOW Output. An LED indicates that the phase is reversed.

[10] Mono LED indicating mono mode operation.

[11] x10 LED Indicates that the MID/HIGH crossover frequency range is 450 Hz to 9.6 kHz

[12] Phase Invert Switch for reversing the polarity on the MID Output. An LED indicates that the phase is reversed.

[13] Phase Invert Switch for reversing the polarity on the High Output. An LED indicates that the phase is reversed.

• Input Connectors : XLR
• Input Type: Electronically balanced/unbalanced, RF filtered
• Input Impedance: Balanced >50k ohm, unbalanced >25k ohm
• Max Input: >+22dBu balanced or unbalanced
• CMRR: >40dB, typically >55dB at 1kHz
• Output Connectors: XLR
• Output Type: Impedance-balanaced/unbalanced, RF filtered
• Output Impedance: Balanced 60 ohm, unbalanced 30 ohm
• Max Output : >+21dBu balanced/unbalanced into 2k ohms or greater
• Bandwidth : 20Hz to 20kHz, +/-0.5dB
• Frequency Response :< 3 Hz to > 90 kHz, +0/-3 dB
• Signal to Noise Ratio:  Ref: +4 dBu, 22 kHz measurement bandwidth
• Signal-to-Noise (Stereo Mode): >94dB (Low Output), >93dB (Mid Output), >90dB (High Output)
• Signal-to-Noise (Mono Mode): >94dB (Low Output, Low/Mid Output); >92dB (High/Mid Output); >88dB (High Output)
• Dynamic Range >: 106 dB, unweighted, any output
• THD+Noise : < 0.004% at +4 dBu, 1 kHz; < 0.04% at +20 dBu, 1 kHz
• Interchannel Crosstalk: < -80 dB, 20 Hz to 20 kHz
• Crossover Frequencies (Stereo Mode) : Low/Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting); Low/High: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting); Mid/High 450Hz to 9.6kHz (x10 setting)
• Crossover Frequencies (Mono Mode): Low/Low-Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting); Low-Mid/High-Mid: 450 Hz to 9.6 kHz; High-Mid/High: 450 Hz to 9.6 kHz
• Crossover Filter Type: Linkwitz-Riley, 24 dB/octave, state-variable
• Low cut Switch: Activates 40 Hz Butterworth, 12 dB/octave high-pass filter, one switch per channel.
• Phase Invert Switch: Inverts the phase at the output, one switch per output.
• x1 / x10 Switch: Multiplies the low-high(mono: low/mid and high/mid) crossover frequency range of the front-panel markings by a factor of 1 or 10, one switch per channel.
• Mode Switch: Selects stereo/mono and 2/3/4-way operation
• LF Sum Switch: Selects normal (stereo) or mono-summed low frequency operation and disables Ch 2’s low output phase invert LED to indicate that this output is not operational in the LF sum mode.
• Indicators: Stereo Operation (Green); Mono Operation (Yellow); Low Cut (Red-per channel); x10 (Green-per channel); Phase Invert (Red-per output)
• Operating Voltage : 100-120 VAC 50/60Hz; 120 VAC 60Hz 230 VAC 50/60Hz
• Operating Temperature: 32°F to 113°F (0°C to 45°C)
• Power Consumption: 15W
• Power Connector: IEC receptacle
• Dimensions: 1.75" H X 19" W X 6.9" D (4.4cm x 48.3cm x 17.5cm)
• Unit Weight: 4.0 lbs. (1.8 kg)
• Shipping Weight: 5.8 lbs. (2.6 kg)