Keep Your Output Level At Unity With the API 225L Discrete Channel Compressor The API 225L Compressor is ideal for all studio, live sound and broadcast applications. Regardless of the threshold or ratio settings, the output level always remains at unity. This unique feature allows for real-time adjustments without the need for changing the output level. Threshold control from +10 to -20 dBu Variable compression ratio from 1 to infinity "OLD" or "NEW" sound HARD or SOFT compression knee Auto-makeup Gain LED Gain Reduction meter API 2510 and API 2520 op-amps Transformer output to +28 dBu Find The Method That Suits Your Style Both NEW ("feed forward") and OLD ("feed back") methods are selectable on the front panel, providing two choices of gain reduction. NEW gain reduction is typical of the newer VCA type compressors that rely on RMS detectors for the gain control voltage. OLD or Feed-Back method is what most of the classic compressors used for the gain control circuit There also is a SOFT or HARD selector. SOFT provides a more subtle compression resulting in a very natural, less compressed sound. HARD results in a more typical, sharp knee type compression that has a much more severe limiting effect. Release time is adjusted by rotating the inner concentric R knob. Release time constants: continuously variable from .3 seconds to 3 seconds. Attack time is adjusted by rotating the outer concentric A knob. Attack time constants: continuously variable from 1 millisecond to 25 milliseconds. API's 225L is designed for individual channel use, or through the use of the external LINK auto-makeup function. Two units can be combined for Stereo applications via a rear access pin. The 225L also has a side-chain input for the detector amplifier. The 225L can be used in the Legacy, Legacy Plus or Vision Series Consoles, or in the L200 Rack. The 225L Compressor makes use of the 2520 and 2510 op-amps and therefore exhibits the reliability, long life and uniformity which are characteristic of all API products. SPECIFICATIONS Size (H x W x D): 1.25 x 2.65 x 7 inches / 32 x 67 x 178 mm Shipping Size (H x W x D): 4.5 x 6.5 x 10 inches / 114 x 165 x 254 mm Actual Weight: 0.6 lb / 272 g Shipping Weight: 0.97 lb / 440 g Manufacturer: Automated Processes IncModel: 225LSKU: I384069-N-0-WHXCWe are Chuck Levin's Washington Music CenterSince 1958, Chuck Levin’s Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.