API 5500 Dual Equalizer

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 TCS-II Channel Strip The API TCS-II (The Channel Strip II) is a professional analog mono channel strip designed to deliver the classic API console sound in a compact rack unit. The signal path combines several iconic API circuits, including the 512C microphone preamp, 550A equalizer, 527A compressor and 325 line driver. The TCS-II functions as a complete recording front-end, offering microphone, line and instrument inputs together with dynamics processing, precision equalization and a high-headroom output stage. Each processing section can be individually engaged or bypassed, allowing flexible signal routing for different studio workflows. At its core are the famous API 2520 op-amps and transformer-balanced output stages, delivering the recognizable API tone with fast transients, strong midrange presence and high headroom. Sound Character The API TCS-II delivers the unmistakable API console sound: punchy, fast and highly musical. The 512C preamp provides powerful and transparent gain, while the 527A compressor with the patented THRUST® sidechain maintains tight and punchy low frequencies. The legendary 550A EQ adds musical tone shaping with proportional-Q filtering and classic API character. This makes the TCS-II an excellent channel strip for both tracking and mixing applications. Highlights ✔ complete analog channel strip ✔ API 512C microphone preamp ✔ API 527A compressor with THRUST® circuit ✔ legendary API 550A 3-band equalizer ✔ API 325 line-driver output stage ✔ mic, line and Hi-Z instrument inputs ✔ ±12 dB boost/cut per EQ band ✔ shelving modes and band-pass filter option ✔ insert points and sidechain input ✔ 10-segment LED metering ✔ individually switchable processing sections Technical Specifications ✔ device type: analog mono channel strip ✔ circuitry: API 2520 op-amps with transformer output ✔ preamp gain: 14 dB – 68 dB ✔ compressor ratio: 1:1 – ∞:1 ✔ attack time: 1 ms – 25 ms ✔ release time: 0.1 s – 3 s ✔ EQ: API 550A 3-band ±12 dB ✔ maximum output level: +30 dBu ✔ inputs: XLR mic, TRS line, Hi-Z instrument ✔ output: balanced XLR line output ✔ format: 19-inch rackmount (approx. 1U)