Altec Model 1650 Active Equaliser
A classic piece of Altec engineering, the Model 1650 is an Acousta-Voicing filter set designed to shape and correct the frequency response of a sound system with precision. Built for professional installations, it offers detailed control over problem frequencies, making it equally at home in studio, live sound, or vintage hi-fi setups.
At its core, the 1650 features multiple band-rejection filters with continuously variable sliders, allowing you to tame peaks, lift valleys, and refine the overall “house curve” of a system. The controls are detented for repeatability, making it easy to recall settings across different rooms or applications - a thoughtful touch that reflects its original use in calibrated environments.
Unlike many passive EQs of the era, the 1650 is an active design with internal gain compensation, ensuring that your output level remains consistent even after significant tonal shaping. Once your curve is dialled in, the gain stage restores level without sacrificing headroom or clarity.
Physically, it's a rackmount unit with a shrouded front panel cover to prevent accidental adjustments - a detail that speaks to its intended use in fixed installations and critical listening spaces.
Key Features
- Multi-band Acousta-Voicing filter set for precise system tuning
- Continuously variable sliders with detented positions for accurate recall
- Active circuitry with up to +20 dB gain reinsertion
- Designed for 150Ω or 600Ω input and output systems
- Rackmount format with protective shrouded front panel
- Optional accessory modules (including transformers and noise generator compatibility)
The 1650 comes from a time when system tuning was done by ear, measurement, and patience. It encourages a more deliberate approach - working through one or two frequency corrections at a time until the response is balanced. For those into vintage studio gear, broadcast equipment, or classic PA systems, it's a genuinely useful tool with a distinctive workflow.
A solid choice for anyone looking to add a piece of Altec history to their rack, or to bring hands-on, analogue control back into system EQ.
Modified with 2 x TRS Sockets for easy connection.
Product Specs
- Item Number: 41736
- Make: Altec
- Model: Model 1650
- Condition: Very Good
- Finish: Black
- Categories: pro-audio ⇒ equalizers
- Year: Late 1970s
- Made In: United States
- MPN: 41736
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Altec Model 1650 Active Equaliser
Altec Model 1650 Active Equaliser
A classic piece of Altec engineering, the Model 1650 is an Acousta-Voicing filter set designed to shape and correct the frequency response of a sound system with precision. Built for professional installations, it offers detailed control over problem frequencies, making it equally at home in studio, live sound, or vintage hi-fi setups.
At its core, the 1650 features multiple band-rejection filters with continuously variable sliders, allowing you to tame peaks, lift valleys, and refine the overall “house curve” of a system. The controls are detented for repeatability, making it easy to recall settings across different rooms or applications - a thoughtful touch that reflects its original use in calibrated environments.
Unlike many passive EQs of the era, the 1650 is an active design with internal gain compensation, ensuring that your output level remains consistent even after significant tonal shaping. Once your curve is dialled in, the gain stage restores level without sacrificing headroom or clarity.
Physically, it's a rackmount unit with a shrouded front panel cover to prevent accidental adjustments - a detail that speaks to its intended use in fixed installations and critical listening spaces.
Key Features
- Multi-band Acousta-Voicing filter set for precise system tuning
- Continuously variable sliders with detented positions for accurate recall
- Active circuitry with up to +20 dB gain reinsertion
- Designed for 150Ω or 600Ω input and output systems
- Rackmount format with protective shrouded front panel
- Optional accessory modules (including transformers and noise generator compatibility)
The 1650 comes from a time when system tuning was done by ear, measurement, and patience. It encourages a more deliberate approach - working through one or two frequency corrections at a time until the response is balanced. For those into vintage studio gear, broadcast equipment, or classic PA systems, it's a genuinely useful tool with a distinctive workflow.
A solid choice for anyone looking to add a piece of Altec history to their rack, or to bring hands-on, analogue control back into system EQ.
Modified with 2 x TRS Sockets for easy connection.
Product Specs
- Item Number: 41736
- Make: Altec
- Model: Model 1650
- Condition: Very Good
- Finish: Black
- Categories: pro-audio ⇒ equalizers
- Year: Late 1970s
- Made In: United States
- MPN: 41736
Original: $106.60
-65%$106.60
$37.31Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
A classic piece of Altec engineering, the Model 1650 is an Acousta-Voicing filter set designed to shape and correct the frequency response of a sound system with precision. Built for professional installations, it offers detailed control over problem frequencies, making it equally at home in studio, live sound, or vintage hi-fi setups.
At its core, the 1650 features multiple band-rejection filters with continuously variable sliders, allowing you to tame peaks, lift valleys, and refine the overall “house curve” of a system. The controls are detented for repeatability, making it easy to recall settings across different rooms or applications - a thoughtful touch that reflects its original use in calibrated environments.
Unlike many passive EQs of the era, the 1650 is an active design with internal gain compensation, ensuring that your output level remains consistent even after significant tonal shaping. Once your curve is dialled in, the gain stage restores level without sacrificing headroom or clarity.
Physically, it's a rackmount unit with a shrouded front panel cover to prevent accidental adjustments - a detail that speaks to its intended use in fixed installations and critical listening spaces.
Key Features
- Multi-band Acousta-Voicing filter set for precise system tuning
- Continuously variable sliders with detented positions for accurate recall
- Active circuitry with up to +20 dB gain reinsertion
- Designed for 150Ω or 600Ω input and output systems
- Rackmount format with protective shrouded front panel
- Optional accessory modules (including transformers and noise generator compatibility)
The 1650 comes from a time when system tuning was done by ear, measurement, and patience. It encourages a more deliberate approach - working through one or two frequency corrections at a time until the response is balanced. For those into vintage studio gear, broadcast equipment, or classic PA systems, it's a genuinely useful tool with a distinctive workflow.
A solid choice for anyone looking to add a piece of Altec history to their rack, or to bring hands-on, analogue control back into system EQ.
Modified with 2 x TRS Sockets for easy connection.
Product Specs
- Item Number: 41736
- Make: Altec
- Model: Model 1650
- Condition: Very Good
- Finish: Black
- Categories: pro-audio ⇒ equalizers
- Year: Late 1970s
- Made In: United States
- MPN: 41736
