API MC531 Monitor Controller

Grace Design M905 Digital Black The Grace Design M905 Digital (Black) is a high-end stereo monitor controller with an integrated reference-grade DAC designed for professional recording, mixing and mastering environments. Built by Grace Design in the USA, the system combines ultra-transparent analog circuitry with advanced digital monitoring functionality and an intuitive remote control interface. The M905 acts as the central hub between DAW systems, digital sources and multiple loudspeaker systems. All digital inputs pass through the internal DAC before reaching the analog monitoring path, ensuring consistent reference-quality playback across all monitoring sources. The system consists of a rack-mounted Audio Control Unit (ACU) and a desktop Remote Control Unit (RCU) featuring a graphical display and precise volume control, allowing engineers to operate the system directly from the listening position. Sound Character The M905 is designed for extremely transparent and accurate monitoring. Its high-resolution DAC and precision analog output stage provide a neutral and highly detailed sound signature with excellent dynamic range and stable stereo imaging. This level of sonic accuracy makes the system particularly suitable for critical mixing and mastering decisions. Highlights ✔ reference-grade monitor controller with integrated DAC ✔ rack audio unit with desktop remote controller ✔ high-resolution D/A conversion up to 24-bit / 192 kHz ✔ USB audio interface with multi-channel digital routing ✔ digital inputs: AES/EBU, S/PDIF, Toslink and ADAT ✔ three stereo speaker outputs plus subwoofer outputs ✔ built-in reference headphone amplifier ✔ talkback and cue monitoring facilities ✔ SPL monitoring and advanced monitoring tools ✔ relay-based signal switching for maximum transparency ✔ precise stepped volume control ✔ 19-inch rack format with desktop remote Typical Studio Applications ✔ central monitoring controller in mixing studios ✔ mastering monitoring with reference DAC ✔ switching between multiple digital and analog sources ✔ multi-speaker monitoring environments ✔ high-quality headphone monitoring station Technical Specifications ✔ Device type: stereo monitor controller with DAC ✔ D/A conversion: up to 24-bit / 192 kHz ✔ Dynamic range: approx. 121 dB ✔ Frequency response: approx. 3 Hz – 1.25 MHz ✔ Maximum output level: +26 dBu ✔ THD+N: < 0.0008 % ✔ Digital inputs: AES/EBU, S/PDIF (coax & optical), ADAT, USB ✔ Digital outputs: AES/EBU, S/PDIF ✔ Analog inputs: XLR / RCA ✔ Analog outputs: 3 stereo speaker outputs + subwoofer ✔ Headphone output: integrated reference headphone amplifier ✔ Format: 19-inch rack / 2U + desktop remote

Grace Design M905 Digital Silver The Grace Design M905 Digital (Silver) is a high-end stereo monitor controller with an integrated reference-grade DAC designed for professional recording, mixing and mastering studios. It combines ultra-transparent analog circuitry with high-resolution digital conversion and comprehensive monitoring features, acting as the central hub between a DAW, audio sources and loudspeaker systems. Technically identical to the black version, the Silver model differs only in its silver front-panel finish. The system consists of a rack-mounted Audio Control Unit (ACU) and a desktop Remote Control Unit (RCU) with display and precision volume control, allowing engineers to operate the monitoring system directly from the listening position. With its integrated DAC, flexible digital connectivity and relay-based analog signal routing, the M905 is ideally suited for critical monitoring environments where accuracy and transparency are essential. Sound Character The M905 Digital is designed for extremely transparent and accurate monitoring. Its high-resolution DAC delivers a neutral sound signature with excellent detail, wide dynamic range and stable stereo imaging, enabling precise evaluation of mix decisions. The high-quality analog output stage ensures reliable reference playback in demanding mixing and mastering workflows. Highlights ✔ reference monitor controller with integrated high-end DAC ✔ identical hardware to the black version, silver finish ✔ rack audio unit with desktop remote controller ✔ high-resolution D/A conversion up to 24-bit / 192 kHz ✔ USB audio interface with up to 10 digital channels ✔ digital inputs: AES/EBU, S/PDIF, Toslink and ADAT ✔ support for high-resolution formats including DSD128 ✔ three stereo speaker outputs plus subwoofer integration ✔ built-in reference headphone amplifier ✔ talkback and cue monitoring functions ✔ precise level control and flexible system configuration ✔ relay-based signal switching for maximum transparency Typical Studio Applications ✔ central monitoring control in mixing studios ✔ reference DAC for mastering monitoring ✔ switching between multiple digital and analog sources ✔ multi-speaker monitoring systems ✔ high-quality headphone monitoring Technical Specifications ✔ Device type: stereo monitor controller with DAC ✔ D/A conversion: 24-bit / up to 192 kHz ✔ USB audio: up to 10 channels (8× ADAT + 2× AES/S/PDIF) ✔ Digital inputs: 2× AES3, S/PDIF, Toslink, ADAT, USB ✔ Digital outputs: AES/EBU, S/PDIF ✔ Analog inputs: balanced and unbalanced line inputs ✔ Analog outputs: 3 stereo speaker outputs + subwoofer ✔ Headphone output: integrated reference headphone amplifier ✔ Control: desktop remote with display ✔ Format: 19-inch rack / 2U with remote controller

Dangerous Music MONITOR ST The Dangerous Music MONITOR ST is a reference-grade analog monitor controller designed for professional recording, mixing and mastering studios. Acting as the central hub between multiple audio sources, loudspeaker systems and cue feeds, it provides complete control over complex monitoring environments while maintaining fully transparent analog signal integrity. The MONITOR ST architecture is based on fully balanced analog circuitry with relay-switched signal paths and highly precise level control. This ensures the audio signal remains completely transparent even in complex studio configurations. In mastering applications, this allows highly repeatable monitoring levels and extremely accurate stereo imaging. The controller manages multiple stereo sources, several speaker outputs and dedicated cue and talkback functions. When combined with the optional MONITOR SR remote unit, full system control becomes available directly from the listening position while the main audio unit remains rack-mounted. ⸻ Monitoring & Workflow The MONITOR ST is designed for professional monitoring decisions in demanding studio environments. Multiple sources can be compared instantly, different speaker systems can be switched without affecting monitoring level, and essential functions such as mono, dim, mute and subwoofer integration remain immediately accessible. Its highly precise level control makes the system especially valuable for critical mixing, mastering and advanced recording workflows. ⸻ Highlights ✔ high-end analog monitor controller for professional studios ✔ fully balanced analog signal path ✔ relay-switched circuitry for maximum transparency ✔ multiple stereo inputs for different audio sources ✔ multiple speaker outputs for different monitor systems ✔ mono, dim, mute and speaker select functions ✔ integrated talkback system ✔ dedicated cue outputs for recording applications ✔ compatible with Dangerous MONITOR SR remote ✔ expandable for complex monitoring systems ✔ 19-inch rack format ⸻ Typical Studio Applications ✔ central monitoring control in mixing studios ✔ mastering monitoring with multiple speaker systems ✔ switching between multiple DAW or analog sources ✔ cue management in recording studios ✔ integration into complex hybrid monitoring environments ⸻ Technical Specifications ✔ Device type: analog monitor controller ✔ Inputs: multiple balanced stereo inputs ✔ Outputs: multiple speaker outputs + cue outputs ✔ Level control: high-precision analog attenuation ✔ Additional functions: mono, dim, mute, talkback ✔ Remote control: compatible with MONITOR SR ✔ Signal path: relay-switched, balanced ✔ Format: 19" rack / 1U

Heritage Audio RAM System 5000 The Heritage Audio RAM System 5000 is a high-end reference monitor controller designed for stereo and 5.1 environments, ideal for professional recording, mixing, mastering, and post-production studios. As the flagship model of the RAM series, it combines maximum flexibility, audiophile signal integrity, and console-grade monitoring control. The system consists of a wireless desktop remote controller and a central 19" rack unit, offering intuitive operation alongside uncompromising audio performance and seamless integration into complex studio setups. Sound Character The RAM System 5000 delivers absolute transparency, precision, and reference-grade monitoring. Its fully analog signal path with gold-plated relays and a 64-step attenuation system (1 dB increments) ensures perfect stereo tracking, ultra-low distortion, and maximum clarity—comparable to large-format studio consoles. This makes it ideal for critical mixing, mastering, and surround production workflows. Highlights ✔ high-end monitor controller for stereo and 5.1 applications ✔ dual-unit system: desktop remote + rackmount unit ✔ 64-step relay-based volume control (1 dB increments) ✔ fully analog signal path with gold-plated relays ✔ configurable for stereo or 5.1 monitoring ✔ 4 stereo analog inputs + additional 5.1 / RCA inputs ✔ digital inputs: AES/EBU, S/PDIF, Toslink + 24-bit/192 kHz DAC ✔ Bluetooth connectivity for mobile devices ✔ up to 5 stereo outputs or full 5.1 monitoring + subwoofer out ✔ independent pre-fader MIX output ✔ advanced CUE system with multiple inputs/outputs ✔ built-in talkback with flexible routing ✔ two high-current audiophile headphone amplifiers ✔ subwoofer management and speaker solo/mute functions ✔ two user-assignable reference level presets Typical Applications ✔ high-end monitoring for mixing and mastering ✔ 5.1 surround and post-production studios ✔ central monitoring hub in professional control rooms ✔ complex hybrid setups with multiple sources and speakers ✔ cue mixing and talkback management for recording sessions Technical Specifications ✔ type: monitor controller (stereo / 5.1) ✔ system: desktop remote + rackmount unit ✔ volume control: 64-step relay attenuation (1 dB steps) ✔ analog inputs: 4 × stereo (+4 dBu) 1 × 5.1 input 1 × stereo RCA ✔ digital inputs: AES/EBU, S/PDIF (coax), Toslink ✔ DAC: Wolfson WM8741, 24-bit / 192 kHz ✔ outputs: 5 × stereo outputs (stereo mode) 5.1 + additional stereo outputs subwoofer output mix output (pre-fader) ✔ headphones: 2 × high-current outputs ✔ cue system: multiple cue inputs/outputs (DB25) ✔ talkback: built-in, routable ✔ format: 19" rack (approx. 2U) + desktop remote

Heritage Audio RAM System 2000 The Heritage Audio RAM System 2000 is a high-end desktop monitor controller designed for precise and flexible monitoring control in professional recording, mixing, and mastering environments. Acting as the central hub between audio sources and monitor systems, it combines audiophile analog circuitry with modern features such as Bluetooth and digital connectivity. At its core is a 64-step relay-based attenuation system with 1 dB increments, delivering console-grade precision, perfect stereo tracking, and ultra-transparent level control. Sound Character The RAM System 2000 delivers maximum transparency and accuracy. Its high-quality analog circuitry with gold-plated relays ensures a clean signal path with extremely low noise and distortion—making it ideal for critical mixing and mastering decisions. The built-in audiophile headphone amplifiers provide powerful, detailed monitoring without coloration. Highlights ✔ professional desktop monitor controller ✔ 64-step relay-based volume control (1 dB increments) ✔ fully analog signal path with gold-plated relays ✔ 3 stereo analog inputs + S/PDIF + Bluetooth ✔ 3 stereo monitor outputs + dedicated subwoofer output ✔ independent pre-fader MIX OUT for recording ✔ dedicated CUE system for headphone mixes ✔ built-in talkback microphone with flexible routing ✔ dual high-quality headphone amplifiers ✔ two user-assignable reference level presets ✔ LED metering and illuminated controls ✔ compact desktop format Typical Applications ✔ central monitor control in professional studios ✔ switching between multiple speaker systems ✔ integrating analog, digital, and mobile audio sources ✔ creating cue mixes for recording sessions ✔ precision monitoring for mixing and mastering Technical Specifications ✔ type: desktop monitor controller ✔ volume control: 64-step relay attenuation (1 dB steps) ✔ inputs: 3 × stereo analog (+4 dBu / switchable -10 dBu) 1 × S/PDIF (coax) Bluetooth (AAC, aptX, SBC) ✔ outputs: 3 × stereo monitor outputs 1 × subwoofer output 1 × mix out (pre-fader) 1 × cue out + cue in ✔ headphones: 2 × 1/4" outputs with independent control ✔ talkback: built-in, routable ✔ max output: > +27 dBu ✔ THD: < 0.001% @ 1 kHz ✔ noise: < -99 dBu ✔ power supply: external PSU ✔ dimensions: approx. 255 × 205 × 70 mm