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manual abstract
U' , * J' . ■'•is CmSl 'A*'.» M 'a* (See) ««^,^»£^0 -ao 10 -a -a tv. ■ -i s * a s o **■ -MO («1 0 CL-50E ■ - . .. ■■■ -Gain Reduction (dB]-Output (dGJ-(Op)-—-Gan ficducoon (dBl— ASHLY » i « • i nuumiB .« .« -w -a « -a o o * o ZJ hl i < i • ig n m n ^ ^ • *»»*»»»»*» ^ »00353535 0 -jo _ _ ~q- ___ Q» 1 i»- —i* '» Oi2 Storo OualChamd u- a- '1» •« "to .*> ar* y 'io •»' '> '•« IdB) Ratio AoacMrftS) Reteitw tSocl Output (dB) CL-52E shly's Compressor/Limiters are tings of the front panel controls. The used to place a ceiling on the detector in Ashly's Compressor/Limiters is peak levels of program materi- a fully symmetrical peak responding type, al. When peaks exceed this and includes a ‘send-return' loop which ceiling, gain is reduced to keep allows frequency selective limiting and peaks within specified limits, other effects. The amount of gain reduction, The detector must constantly adjust the attack and release times, and the output gain of the audio path in a manner which gain matching are all precise and inde- keeps the level under control while still pendent adjustments. This makes the CL- sounding acceptable to the listener. This 50E and the CL-52E extremely useful for constantly changing gain is a dynamic such diverse applications as loudspeaker action, while conventional audio measure- protection, broadcast limiting or compres- ments like noise and distortion checks are sion, recording, tape-to-disc transfer, spe- static (constant level). This led us to use a cial effects, vocal level control, and purely subjective approach in the design musical instrument sustain. of the detector; we did a lot of listening to The two important components of any determine what sounded good and what limiter are the VCA (Voltage Controlled didn't. As a result of this research, we Amplifier), which actually performs the designed the detector to allow the attack function of reducing gain, and the detec- and release times to speed up as more tor, which essentially tells the VCA what to and more limiting occurs (the compression do, i.e. when to reduce reduce the gain ratio also increases), and we utilized a and by how much. On the surface, it might double-release time constant to minimize seem like the VCA is the most critical 'pumping' and 'breathing'. The result is a component, since audio actually passes natural-sounding compressor/limiter that through it while the detector merely pro- responds very well to a wide variety of vides it with a DC control voltage, but audio applications, experience has shown us that both are The CL-50E is Ashly's single channel crucial to the overall sound. compressor/limiter. The CL-52E is essen- The VCA in Ashly's Compressor/ tially two CL-50E’s in one rack space, but Limiters represents a new generation of it offers improved metering and switching, integrated circuits that offer exceptionally The CL-52E can be used as a stereo low noise and distortion figures, flat fre- compressor/limiter or as two separate quency response, freedom from thermal mono units. Ten-level meters are provided drift and excellent reliability. Audio signals on each channel to indicate gain-reduc- passing through the VCA emerge clean tion and output level, and uncolored. The CL-50E and CL-52E compressor/ The detector has the task of monitoring limiters, like all Ashly products, are now incoming audio levels and changing the fully covered by Ashly's exclusive five- gain of the VCA as determined by the set- year worry-free warranty. A <3 Extremely Low Noise and Distortion Detector Patch Points for Frequency-Selective Limiting Gain Reduction Meters In-Out Bypass Switching Inputs and Outputs May Be Used Balanced or Unbalanced Unusually Wide Control Range on All Parameters Output Level Meters and Clipping Indicators (CL-52E) Front Panel Stereo Tie Switch (CL-52E) Specifications CONTROLS stereo tie switch (CL-52E ONLY) defeat switch gain: ±30dB ratio: 2:1-« attack time: 200uS. - 20mS. release time: 100mS - 2Sec. output: -40dBV - +20dBV Detector Patch Point: allows the connection of an EQ for frequency selective limiting Maximum Input/Output Level: +20dBm Input Impedance: 10kQ balanced bridging Output Impedance: 50£2 term, w/ 600Q or more Frequency Response: ±.2dB 20Hz - 20kHz Distortion: <.015% THD, OdBV 20 Hz • 20kHz, no limiting <.15% +l8dBV worst case Hum and Noise: -95dBV unity gain Power Requirements: 120 VAC, 50-60HZ, 5W Size: 19" L x 1 3/4"H x 6”D Shipping Weight: 8lbs Architect’s Specification The unit shall be a single (CL-50E) or dual (CL-52E) channel compressor/limiter with independent attack, release and ratio adjustments. It shall have detector patch points which allow con* nection of an external equalizer in the detector loop to produce frequency selective limiting. It shall have front panel mounted switches for engaging/ defeating the compressor/limiter functions, Performance specifications of a typical production unit shall me...