The HD-231 is dual, 31 band, 1/3 octave graphic equalizer ideal for live sound systems, PA systems, permanent or fixed Installations, church systems, nightclub systems, practice PA systems, DJ sound systems, as well as home and project studios. With so many useful features and rugged construction, the HD-231 EQ will prove its value with every gig and live performance.

Features:

• Accurate Constant Q Precision Center Frequencies
• Exceptional Frequency Response at 20-20KHz, +/-0.5dB
• Equipped with XLR, 1/4Ó Phone and Euroblock Barrier Strip Connectors
• Independent Variable Hi and Low Pass Filtering deliver optimum control
• Automatic Bypass Relays provided in case power is lost to the unit
• Extremely Quiet Operation
• Rugged Chassis Design

Specifications:

• Overall Gain Range: Off to +6dB (Unbal. out) sliders centered; Off to +12dB (Bal. out) sliders centered
• Filter Type: Constant Q, 3% Center Frequency
• Input Type: Active Balanced/Unbalanced; 3-pin XLR, 1/4" TRS (Bal.), Euroblock
• Input Impedance: 24k ohms (balanced); 12k ohms (Unbal.)
• Max Input Level: +22dBm (level control at center)
• Output Type: Active Balanced/Unbalanced; 3-pin XLR, 1/4" TRS (Balanced), Euroblock
• Output Impedance: Typical <150 ohms
• Max Level: +22 dBm (Bal. 600 ohm load) +16dBm (Unbal., 2k ohm load)
• RFI Filters: Yes
• Bypass Switches: Passive
• Overload: LED Threshold 6 dB below clipping, (all filters set to flat)
• High Pass Filter: 10-250Hz, 12dB/Oct
• Low Pass Filter: 3k-40kHz, 12dB/Oct
• Frequency Response: 20-20kHz, +/-0.5dB
• THD + Noise: less than 0.01% (20Hz-20kHz, 0dBu)
• IM Distortion (SMPTE): 0.005%
• S/N Ratio: >98dB, Ref. 0dBu, (Bal.) 20Hz-20kHz, unweighted
• Headroom: +22dB, Ref, 0dBu (Bal.) (+/-6dB and +/-12dB range)
• Dynamic Range: >117dB (Bal)
• Channel Separation: >60dB
• Common Mode Rejection: 50dB typical
• Range: +/-6dB or +/-12dB (Selectable)
• Size (H x W x D): 3.5" x 19" x 7"
• Slider Travel: 20mm (Positive Center Detent)
• Weight: 12 lbs