LIMITED WARRANTY This product is warranted to the original consumer purchaser to be free from defects in materials and workmanship under normal installation, use and service for a period of one (1) year from the date of purchase as shown on the purchaser's receipt. The obligation of Rolls Corporation under this warranty shall be limited to repair or replacement (at our option), during the warranty period of any part which proves defective in material or workmanship under normal installation, use and service, provided the product is returned to Rolls Corporation, TRANSPORTATION CHARGES PREPAID. Products returned to us or to an authorized Service Center must be accompanied by a copy of the purchase receipt. 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. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS OR ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, WHATSOEVER. Some states do not allow the exclusion or limitation of special, incidental or consequential damages so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. 6 TIO -12 -18 -24 RATIO THRESHOLD RATIO ATTACK RELEASE LEVEL THRESHOLD GAIN REDUCTION 8 9:1 ACTIVE GATE PWR 10 12 18 24 38 2.5 0 +10 +4 :1 10 mS 1 5 Sec .5 -10 dB +20 -30 dB off GATE THRESH slow fast GATE REL 0 7:1 COMPRESSOR/LIMITER GATE RP252 ATTACK RELEASE LEVEL ROLLS CORPORATION SALT LAKE CITY, UTAH 11/01 OWNERS MANUAL 1 2 3 R109 2K C102 1U R107 100K -V R110 1 100K LM358 4 10K Q1 2N3904 C104 2N3904 47K +V 8 R116 D31 10K LDRR P8 P100K RELEASE +V R115 220K Q2 C105 10U 5 6 -V -V LM358 U2B 7 R117 1M C106 503 11 C110 10U 2 +V R112 R114 1 3 C109 OFFSET R5 +V 50K TP +V 2 7 8 9 C101 27PF 2 R104 100K U1A 4560 4 DPDT R9 R123 47K -V 503 R111 22K 3 4 R118 22K 8 IN 2 R101 10K R106 1K 3 1 R105 10K -V U2A OUTPUT TRIM R129 P100K 4.7K 4.7K R125 15 R131 C8 .001 22K 1 R132 4.7K 27PF R130 D6 LM13600 8 U3A 7 9 10 2 1 5 470 R128 8 3 47K 4.7K 1N4148 6 1 2 R102 10K 3 1 R121 220K LM13600 14 U3B 13 R134 470 +V 4560 3 +V 6 16 12 J2 XLR F PC -V R145 100K 1 4 5 6 SW4B 4PDT R146 10K U11A 4560 4 C107 120PF C108 1U 4560 2 1 2R143 100 -V C10K P12 ATTACK D37 1 N 4 1 4 87 P13 100K RATIO C10 THRESHOLD .001 500K R137 47K P14 D7 1N4148 U5B 4560 D8 4 R127 3 R119 R120 4.7K 10K C112 27PF 5 1N4148 6 2 R138 1 10K R140 10K U5A 4560 -V 3 R136 22K C111 1U R122 10 C12 470PF R124 6.8K 3 2 3 Q3 J113 4 5 U4B 7 CR3 1N4148 +V J7 PHONE 1/4 -V D40 1N 751A R126 51 R135 1M R235 1M SIDE CHAIN J8 PHONE 1/4 -V R141 10K R7 1M 1U D32 LDRR 4 5 R2 6 DPDT SW2B RELEASE 500K J3 PHONE 1/4 R203 10K C201 R201 10K 120PF 4PDT SW5A R144 100K P11 C114 10UF R208 +4/-10 P2 P100K 1 2 3 -V R139 10K R214 47K C202 1U R204 100K 2 +V GATE CLOSED R216 LDRR OFFSET 8 SW5C 4PDT 9 8 7 R233 +V +V R215 220K LM358 R217 1M R206 1K 3 7 C206 503 11 J9 PHONE 1/4 C209 R6 +V 50K TP +V 2 15 R231 470 R223 47K 2 R202 10K 3 U6A 1 4 2 +V C203 120PF 33K R212 RELEASE R209 P1 10K 2K P100K R207 Q7 2N3904 100K -V C204 R210 C205 Q8 10U 1100K U7A 5 503 3 LM358 4560 R205 10K -V R211 22K -V 2N3904 -V 6 4.7K R225 U7B 3 4 22K R229 OUTPUT TRIM P100K 4.7K P3 R8 C9 .001 D9 1 27PF R230 R228 8 C210 10U 47K 4.7K +V 9 10 R232 4.7K 3 R234 470 1 2 Q10 J113 J10 XLR JACK M 1 -V R221 LM13600 LM13600 220K 14 8 U8A U8B 7 13 J4 XLR F PC 4 C207 120PF 1 5 1N4148 6 1 BYPASS SW3A 1 4560 -V +V 8 6 16 12 2 R218 22K 3 2 2 D35 1N4148 R245 100K SW1A DPDT STEREO/MONO 1 3 4560 U9A R224 3 6.8K R246 10K 1 U12A 4560 4 C11 THRESHOLD .001 R237 P7 500K 47K 1 R222 10 4 5 6 R243 2 100 SW5B 4PDT -V R244 100K 8 2 R227 3 2 3 Q9 J113 D38 ATTACK 1 N 4 1 4 8 7 4 5 18K C208 1U R226 51 U10B 4560 C10K P5 +V 5 6 4560 U11B R148 18K R147 22K CR1 C117 .047 E1 E2 D1 1N4001 1 1N4001 D2 E3 1N4001 D3 7812 U17 I G U9B 7 3 DPDT 5 1N4148 6 R238 1 10K P6 100K RATIO P4 500K 7 RELEASE C214 10UF R241 10K R239 10K R240 10K D36 C212 27PF U10A 4560 4 2 3 R220 R219 4.7K 10K R236 22K C13 470PF C211 1U -V D39 1N 751A -V J11 PHONE 1/4 D33 LDRG 4 J12 PHONE 1/4 +V 8 D34 LDRR SW1B 5 R4 6 4.7K 6 DPDT R263 10K 5 R150 R152 R154 +V R151 R153 +V 3 O C3 1U 2 4 5 R3 4.7K -V 4560 R158 R160 R162 +V R159 R161 1N751 R247 22K 2K X5 2K X5 6 U12B 7 5 R250 R252 R254 +V R251 R253 C217 503 CR2 1N751 C1 POWER C5 LDSG 503 D5 1 SW3B DPDT -V 6 +V 8 1 X5 R155 4.7K R149 10K C6 503 C2 G 8 2 2 0 0 U . 1 6 V2 2 0 0 U . 1 6 V 9 8 7 6 5 4 3 2 1 9 8 7 6 5 4 3 2 1 9 8 7 6 5 4 3 2 1 I D4 1N4001 U18 7912 O -V 4.7K R1 10K R156 1K U13 BA6125 D10, D11, D12, D13, D14 U14 BA6125 R164 10K D15, D16, D17, D18, D19 U15 BA6125 D20, D21, D22, D23, D24 9 8 7 6 5 4 3 2 1 1 Description Front Panel Rear Panel Operation Schematic Warranty Table of Contents Inspection Specifications SPECIFICATIONS Input Impedance: Max Input Level: THD: Threshold range: Attack Time: Release Time: Compression Ratio: Gate Threshold: Output Gain: Dimensions: 1 1 1 2 2 2 3 3 4 4-5 6 Back Cover 10k9 balanced +21 dBu .05% typical -40dBu to +10dBu 1 - 10ms. 0.5 - 5 Sec. 2:1 - infinity:1 -30 to +4 dB, and Off. -10 - +20dB 1.75" x 6" x 19" (44mm x 152mm 483mm) R108 +4/-10 P9 P100K C103 120PF 33K GATE CLOSED +V SW2A I/0 DPDT X4 SW4C R133 470 J5 PHONE 1/4 TABLE OF CONTENTS Introduction Understanding Compression Gating INSPECTION 1. Unpack and Inspect the RP252 package Your RP252 was carefully packed at the factory in a protective carton. Nonetheless, be sure to examine the unit and the carton for any signs of damage that may have occurred during shipping. If obvious physical damage is noticed, contact the carrier immediately to make a damage claim. We suggest saving the shipping carton and packing materials for safely transporting the unit in the future. 2. Please complete the Warranty Registration Card and return it to the factory. J1 PHONE 1/4 4PDT R103 SW4A 10K OUT J6 XLR JACK M Q4 J113 3 2 4560 U1B +V 2K 2K X5 R248 18K R163 10K R157 10K R255 4.7K C4 47U 2 3 R256 1K 6 R249 10K C7 503 R264 R257 10K 5 U6B +V 4560 7 R260 R258 R259R261 R262 7 ROLLS CORPORATION U16 BA6125 D25, D26, D27, D28, D29 Size: 5968 South 350 West Salt Lake City, UT 84107 COMPRESSOR / LIMITER / GATE RP252 Document Number: Rb RP252.SCH Date: 14 October 2001 Rev: E Sheet 1 of 1 SCHEMATIC 6 OPERATION CONT Raising the Signal Out of a Mix Since reducing dynamic range can increase the average signal level and meter readings, a single track can be brought up out of a mix by boosting its level slightly and applying compression. Set the Threshold for 4 dB to 6 dB of compression. 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. Control is the main idea. 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. REAR PANEL NOTE: Descriptions are identical for both Channels One and Two MODEL RP252 SERIAL NUMBER 252C US ACTIVE GATE GAIN REDUCTION CHANNEL 2 SIDE CHAIN OUTPUT INPUT CHANNEL 1 SIDE CHAIN OUTPUT INPUT ACTIVE GATE PWR WARNING: To reduce the risk of electric shock or fire, do not expose this device to rain or moisture. : CAUTION: To reduce the risk 2 4 4:1 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 8 9:1 10 12 18 24 38 2.5 0 +10 +4 0 RATIO COMPRESSOR/LIMITER GATE RP252 120 VAC 50/60 Hz 15 VA MADE IN U.S.A. RISQUE DE CHOC - NE PAS ENLEVER OUTPUT INPUT INST LINE OUTPUT INPUT INST LINE THRESHOLD RATIO ATTACK RELEASE LEVEL THRESHOLD ATTACK RELEASE LEVEL of electric shock do not remove lid. No user serviceable parts inside. Refer servicing to qualified service personnel. THRESHOLD: Sets the level at which the RP252 becomes active. When the signal level is below the threshold point, the signal is unprocessed. When the signal level is above the threshold point, there may be compression/limiting. RATIO: This sets the ratio of input signal to signal compression. Called `signal-tocompression ratio, at 1:1 the signal is left unprocessed and at infinity:1, no matter how much the input increases, the output will not be above the threshold - this is called limiting. ATTACK: Adjusts how fast the control circuits respond to the dynamics of the input. If this is set longer, it will take more time for gain reduction to occur, so rapidly rising inputs will go through for a short period of time. RELEASE: Adjusts how long before the control circuits return to a steady state. A short release time can make sound be choppy and gated. A long release time can make music seem to rise and fall as a wave. It is recommended to start with a long Release time, then shorten it if necessary. OUTPUT LEVEL: Sets the output level to help compensate for compression losses. If the Threshold is set low, more output level may be needed because gain reduction starts at a low level. ...