User manual ROLLS RP252

[. . . ] In the absence of such purchase receipt, the warranty period shall be one (1) year from the date of manufacture. This warranty shall be invalid if the product is damaged as a result of defacement, misuse, abuse, neglect, accident, destruction or alteration of the serial number, improper electrical voltages or currents, repair, alteration or maintenance by any person or party other than our own service facility or an authorized Service Center, or any use 1 2 -6 0 +4 -30 -40 dB +10 2:1 :1 10 mS 1 5 Sec . 5 -10 dB +20 -30 dB off GATE THRESH slow fast GATE REL -30 -40 dB +10 2:1 RP252 Compressor/Limiter/Gate GAIN REDUCTION 4 4:1 ACTIVE GATE 6 7:1 8 9:1 10 12 18 24 38 2. 5 0 +10 0 STEREO -18 -24 1 -12 2 -6 0 4 4:1 6 7:1 violative of instructions furnished by us. This one-year warranty is in lieu of all expressed warranties, obligations or liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILITIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, SHALL BE LIMITED IN DURATION TO THE ONE YEAR DURATION OF THIS WRITTEN LIMITED WARRANTY. [. . . ] Preventing Sound System Overload (Limiting) Applications where an abolute maximum signal level must be set to avoid distortion or speaker damage, set the RP252 for Limiting. Limiting has been defined as a signal-to-compression ratio of 10:1 or more. Start with the Ratio at infinity:1, use a fast Attack and set the Threshold at 15 dB of compression or just a few dB below the clipping point of the sound system. At low levels the RP252 won't do anything, but at higher levels the peaks will be limited to the Threshold point. Often, it is recommended the compressor/limiter be inserted just before the power amp, some systems even have a separate compressor/limiter on each output of the crossover. INTRODUCTION Thank you for choosing the ROLLS RP252 Compressor/Limiter/Gate. We recommend you take a moment and read through this manual as it provides information that will assist you in using your unit to it's fullest potential. The RP252 provides clear sonic quality and performance for the working musician, DJ, studio operator, or anyone needing a friendly Compressor/ Limiter/Gate. The RP252 incorporates "soft-knee" compression and a 100 dB log averaging detector for amazing accuracy and smooth performance. The input connectors on the rear are designed to be used with -10 dB to +4 dB signal levels. UNDERSTANDING COMPRESSION The primary purpose of a compressor is to reduce and control the dynamic range of a program; from gentle narrowing of overall levels to limiting of peaks, to squashing all dynamics. Another major use for compressors is to add punch to sloppy sounds. A compressor can do this by making the level of an instrument or a sound more consistent, or by reducing the volume of the more sustained sections of a note, which comparatively accentuates the leading edge (Attack). Sustain of instruments, especially guitars and bass can be achieved by raising the volume of low-level trailing edges of a note, which gives solid presence to the instrument. It also makes the note-by-note volume more even. All this is done by changing the gain in response to the signal. When the input is low in level, the compressor gain remains fixed, usually at 0 dB (unity gain) or greater. When the input increases above the threshold set by the compressor, the gain begins to decrease (i. e. , the amount of gain reduction increases). For very large inputs, the gain can decrease considerably, Therefore, as signals get larger, the gain reduction will increase, depending where the Threshold, Ratio and Output Level are set. GATING Gating is used to cut noise or "hiss" when there is no signal, or when the signal is below a certain threshold. Sometimes, such as with drums, the gate is used to stop all sound except when the drum is played, to remove background noise. 5 2 DESCRIPTION FRONT PANEL NOTE: Descriptions are identical for both Channels One and Two GAIN REDUCTION 1 -12 -18 -24 -30 -40 dB +10 2:1 :1 10 mS 1 5 Sec . 5 -10 dB +20 -30 dB off GATE THRESH fast slow GATE REL -6 0 +4 -30 -40 dB +10 2:1 :1 10 mS 1 5 Sec . 5 -10 dB +20 -30 dB off GATE THRESH slow fast GATE REL DESCRIPTION CONT. [. . . ] Fattening Kick Drums and Compressing Other Drum Sounds Weak, flabby kick drums often have too much boom and not enough slap. Tighen them up by increasing the Attack time and setting the threshold for 15 dB of compression on the peak of the kick. Because the RP252 takes time to react, this will emphasize the slap at the beginning of the note and reduce the boominess of its body. The RP252 also works well for tightening snare drums and tom toms and can be used with drum machines to effectively alter the character of any electronic drum sound. [. . . ]