API ASM164 Summing Mixer
MPN #ASM164
16-channel analog summing mixer with API's legendary discrete sound, dual stereo buses, balanced I/O, insert points, VU meters, and based on the summing section of THE BOX Console
The API ASM164 is a 16-channel rackmount analog summing mixer designed to bring the renowned API summing sound to professional and project studios. Inspired by the summing section of API's The BOX console, it offers a streamlined yet powerful way to achieve warm, punchy, and clear mixes. Each of the 16 input channels features balanced line-level connections, an API 2510 opamp, and an assignable pan control, allowing for precise stereo imaging. The mixer includes two stereo program buses (Mix-A and Mix-B) with independent inserts, giving engineers flexibility for external processing such as EQ and compression. Additionally, the ASM164 offers high-quality API 2520 opamp-driven transformer-coupled outputs, ensuring the signature depth and character that API gear is known for.
Designed for seamless integration into various workflows, the ASM164 provides comprehensive rear panel connectivity, including balanced DB-25 and XLR connections, making it easy to interface with patch bays, DAWs, and other studio gear. A dedicated External Input (EXT IN) allows additional stereo signals to be summed into the mix, while the Mix-A to Mix-B summing option enables parallel processing for added creative control. High-precision VU meters ensure accurate level monitoring, and a detented level control system provides precise recall of settings. Whether used as a standalone summing solution or combined with multiple units for expanded channel count, the API ASM164 delivers the classic analog warmth and detail that API consoles are celebrated for, all in a compact and efficient format.
Features
16 Summing Inputs " Each with balanced connections, inserts, pan control, and LED metering.Dual Stereo Mix Buses (Mix-A & Mix-B) " Independent level controls, inserts, and routing options.Mix-A to Mix-B Summing " Enables flexible signal routing and parallel processing.Balanced External Input " Assignable to Mix-A and Mix-B for additional mixing options.High-Quality API Sound " Uses API 2510 and 2520 opamps with transformer-coupled outputs.VU Meters with A/B Selection " Allows monitoring of output levels with a +10dB boost option.Comprehensive Rear Panel " Includes DB-25, XLR, and TRS connections for easy integration.External Power Supply " Provides stable and efficient performance.
Specifications
Audio Performance
Input Impedance: 30K Ohms (balanced)Mix Output Impedance: 75 Ohms (transformer-coupled, balanced)Max Input Level: +28 dBuMax Output Level: +28 dBuFrequency Response: ±0.5 dB from 20 Hz to 40 kHzTHD+N: < 0.02% @ +4 dBu, 1 kHzSignal-to-Noise Ratio: -112 dBr
Input Channels (1-16)
Balanced, line-level, low-impedance inputsConnectors: DB-25 (8-channel standard pinout)API 2510 input opamp (same as API "The BOX")Balanced insert send and returnInsert switch with illuminated indicator31-step detented level control (-? dB to +6 dB)0 dB bypass option for all channelsContinuously variable pan control with center detent4-segment LED level meter per channelAssignable to Mix-A and/or Mix-B stereo buses
External Input (EXT IN)
Stereo balanced, line-level, low-impedance inputConnectors: 3-pin female XLR (1=G, 2=+, 3=-)4-segment LED level meterAssignable to Mix-A and/or Mix-B busesFixed unity gain (0 dB)
Summing Mix Buses (Mix-A & Mix-B)
Independent stereo summing busesBalanced insert send and return for each mix busInsert switch with illuminated indicator31-step detented mix output level control (-? dB to +6 dB)Balanced, transformer-coupled, low-impedance stereo XLR outputsMix-A to Mix-B summing for flexible routingAPI 2520 opamp and transformer mix output circuits
Mix Output VU Meters
High-quality stereo analog VU metersAssignable to Mix-A or Mix-B via switch+10 dB meter shift option
Rear Panel Connections
Power: 6-pin DIN external power connector (threaded, locking)Channel Inputs: DB-25 (balanced, line-level)Channel Insert Send/Return: DB-25 (balanced, line-level)External Input (EXT IN): XLR Female (balanced)Mix Outputs: XLR Male (balanced)Mix Insert Send/Return: ¼" TRS (balanced)
Additional Features
Cascade multiple ASM164 units for expanded channel countCompatible with professional patch baysDesigned for high-end studios, project studios, and production environmentsProvides the classic "discrete" API analog summing sound
Weight & Dimensions
Actual: 12 lbs (5.5 kg)Shipping: 17 lbs (7.7 kg)Dimensions: 19" x 3.5" (2U) x 11.25" depthShipping Dimensions: 21" x 8" x 14.5"
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