API ASM164

API 5500 Dual Equalizer The API 5500 Dual Equalizer is a professional 2-channel 4-band equalizer in 19-inch rack format, bringing the classic sound of the legendary API 550 series into a modern stereo outboard unit. The design is directly based on the famous API 550A and 550B equalizers, combining their musical EQ curves with additional stereo and mastering functionality. Each channel uses discrete API circuitry with legendary API 2520 op-amps and transformer-balanced output stages, delivering the recognizable API sound with excellent headroom, transient clarity and strong musical presence. The equalizer provides four fully selectable frequency bands per channel, each using API’s well-known proportional-Q circuit. As boost or cut increases, bandwidth narrows automatically for highly musical tonal shaping. An additional stereo-link mode allows precise matched stereo processing for mix bus and mastering applications. Sound Character The API 5500 delivers the classic musical, punchy and direct API EQ sound. Midrange remains focused and powerful, lows stay controlled and highs sound open and natural. On stereo buses the EQ produces highly musical boosts without sounding artificial. It performs exceptionally well on mix bus, mastering, drums, vocals and subgroup processing. Highlights ✔ 2-channel 4-band equalizer in 19-inch rack format ✔ based on API 550A / 550B circuitry ✔ discrete API 2520 op-amp design ✔ 4 bands per channel ✔ classic proportional-Q circuit ✔ stereo-link mode ✔ switchable ±12 dB / ±6 dB range ✔ ideal for mixing and mastering ✔ hard bypass per channel ✔ balanced XLR connectivity ✔ 19-inch rack / 2U

API 3124V The API 3124V is a professional 4-channel microphone preamplifier in a 19-inch rack format, based on the legendary API 312 circuit used in classic API consoles from the 1970s. It combines discrete Class-A electronics with the iconic API 2520 op-amps and proprietary transformers, delivering the distinctive API sound known for punch, clarity and fast transient response. Each of the four channels features independent gain and output level controls along with comprehensive signal-processing functions. A defining feature of the 3124V is its variable output level control, allowing engineers to drive the input stage harder for transformer saturation while keeping the output level optimized for converters or downstream gear. Additional controls include -20 dB pad, polarity reverse, 48 V phantom power and a switchable 3:1 transformer output tap, providing flexible gain structure and tonal variation. Sound Character The API 3124V delivers the classic fast, punchy and forward API tone widely used in professional studios. Its discrete circuitry and transformer design provide excellent transient detail, strong midrange presence and tight low-frequency response, making it especially popular for drums, guitars and rock vocals. Highlights ✔ 4-channel microphone, line and instrument preamp ✔ classic API 312 circuit design ✔ discrete electronics with API 2520 op-amps ✔ proprietary API input and output transformers ✔ variable output level control per channel ✔ switchable 3:1 output transformer tap ✔ -20 dB pad, polarity reverse and phantom power ✔ front-panel Hi-Z instrument inputs ✔ LED metering per channel ✔ 19-inch rackmount design (1U) Technical Specifications ✔ device type: 4-channel mic / line / instrument preamp ✔ gain range: up to approx. 65 dB ✔ inputs: 4 × XLR mic, 4 × ¼" Hi-Z instrument ✔ outputs: 4 × XLR line outputs ✔ controls: pad, polarity, phantom power, transformer tap ✔ format: 19" rack / 1U ✔ power: internal power supply (IEC)

API 2500+ The API 2500+ is a professional reference-grade stereo bus compressor, based on the legendary API 2500 compressor and designed for advanced mixing, mastering and bus compression applications. The “Plus” version expands the classic API concept with additional sidechain and routing functions for modern production workflows. Its circuit uses classic API discrete technology with API 2510 and API 2520 op-amps plus transformer-balanced output stages, delivering the recognizable API sound known for punch, precision and musical density. A defining feature is the patented THRUST® sidechain circuit, which reshapes detector response to keep low frequencies tight and controlled without over-triggering compression. The compressor also offers API’s classic Old / New compression modes, allowing selection between vintage-style feedback compression and modern feed-forward behavior. Sound Character The API 2500+ delivers the signature fast, punchy and energetic API compression sound. It preserves transient detail while adding cohesion, punch and density to stereo mixes. On the mix bus it provides the classic API glue without sacrificing openness or clarity. Low frequencies remain controlled and powerful thanks to the THRUST® circuit. Highlights ✔ professional stereo bus compressor for mixing and mastering ✔ discrete API 2510 / 2520 amplifier design ✔ THRUST® sidechain circuit ✔ Old / New compression mode ✔ selectable knee characteristics ✔ variable attack and release controls ✔ adjustable stereo link control ✔ high-pass sidechain filter ✔ external sidechain insert ✔ hard relay bypass ✔ precision analog metering

API 3122V The API 3122V is a professional 2-channel microphone, line and instrument preamp in a 19-inch rack format, designed to deliver the classic API console sound in a compact studio unit. The circuit design is based on the same architecture used in well-known API preamps such as the 312, 512c and 3124V, featuring the legendary API 2520 op-amps and proprietary transformers. The unit provides two fully independent channels with flexible control options including gain, variable output level and a fixed high-pass filter. Switchable front and rear inputs allow microphones, line sources or instruments to be connected without repatching. Additional studio features include -20 dB pad, polarity reverse, 48 V phantom power and a 3:1 output transformer tap, giving engineers greater control over gain structure and tonal character. Sound Character The API 3122V delivers the classic punchy and articulate API preamp tone. Its discrete circuitry offers fast transient response, strong midrange presence and tight low-frequency control, making it ideal for drums, vocals, guitars, bass and synthesizers. Highlights ✔ 2-channel microphone / line / instrument preamp ✔ classic API 312 circuit design ✔ API 2520 op-amps with transformer-balanced output ✔ proprietary AP2516 input transformer ✔ variable output level control ✔ fixed high-pass filter (~50 Hz) ✔ 3:1 output transformer tap selection ✔ -20 dB pad, polarity reverse and phantom power ✔ front-panel Hi-Z instrument inputs ✔ analog VU meters with peak LEDs ✔ 19-inch rackmount design (1U)

API The Box II The API The Box II is a compact analog recording and mixing console designed to deliver the classic API console sound in a space-efficient studio format. It combines microphone preamps, analog summing, 500-series processing, bus compression and monitoring control in a single production console. The console features eight fully equipped input channels with API microphone preamps, line inputs and high-pass filters. Each channel also includes its own 500-series slot, allowing engineers to integrate external signal processors directly into the channel strip. The summing section supports 16 channels during recording and up to 24 channels during mixdown, enabling analog summing of DAW tracks. A built-in stereo bus compressor provides the classic API mix glue. In addition to mixing capabilities, The Box II includes a complete monitor section, cue sends, talkback system and flexible routing, making it a central hub for modern hybrid studio workflows. Sound Character The Box II delivers the unmistakable API “big console” sound with punch, clarity and powerful midrange presence. Its discrete circuitry and transformer-based design provide fast transient response and a cohesive analog mix bus, giving mixes more depth and energy. Highlights ✔ compact analog recording and mixing console ✔ 8 input channels with API microphone preamps ✔ 8 integrated 500-series slots ✔ direct output on every input channel ✔ 16 summing channels (24 during mix) ✔ built-in stereo bus compressor ✔ instrument DI inputs on channels 1–4 ✔ aux sends: 1 stereo + 2 mono ✔ cue send and headphone system ✔ full monitor control section for two speaker systems ✔ integrated talkback system ✔ extensive balanced I/O connectivity Technical Specifications ✔ device type: analog recording and mixing console ✔ inputs: 8 mic/line channels ✔ 500-series slots: 8 ✔ summing channels: 16 recording / 24 mixing ✔ aux buses: 1 stereo + 2 mono ✔ instrument inputs: 4 Hi-Z DI inputs ✔ mic gain range: approx. +30 dB to +65 dB ✔ max input level: +28 dBu ✔ frequency response: 20 Hz – 50 kHz (±0.5 dB) ✔ dimensions: 82.5 × 67 × 33.5 cm ✔ weight: approx. 40.8 kg