Page 1: ...PLEASE READ THE SECTION ON UNPACKING AND INSPECTION UBL UREI ELECTRONIC PRODUCTS model 7110 LIMITER COMPRESSOR JBL Incorporated 8500 BALBOA BOULEVARD P O BOX 2200 NORTHRIDGE CA 91329 USA PHONE 818 893...
Page 2: ...Installation of Optional Output Transformer 9 Section Three Operation Application 9 3 1 Turn On Procedure 9 3 2 Compressors and Limiters Definitions and Functions 9 3 3 Getting Started 1 3 3 4 The Au...
Page 3: ...damage is evident do not destroy any of the packing material or the carton and immediately notify the carrier of a possible claim for damage Damage claims must be made by you The shipping carton shou...
Page 4: ...LED display indicates the amount of gain reduction in dB D AUTO Switch Auto ON presets the Detector Attack and Ratio controls and engages a program dependent Release circuit An LED indicates that the...
Page 5: ...ed up After the power is switched on there is a 3 second delay before any processed signal is passed through the unit During this time and at any time power is off the input signal is passed directly...
Page 6: ...ip is ring is and sleeve is ground See Section 3 6 H Input Signal The input signal can be applied at the female XL type connector pin 3 pin 2 the 1 4 inch phone jack tip is ring is and sleeve is groun...
Page 7: ...ve the strap on the rear panel barrier strip which connects audio ground and chassis Removal of this strap may have a significant effect on reducing the hum Audio ground will then be referenced from t...
Page 8: ...ignal carrying conductor of the cable from that source to the V terminal of the barrier strip phone jack tip or XL connector pin 3 and wire the shield to the terminal of the barrier strip phone jack r...
Page 9: ...or at the other end of the line from the 71 1 0 in combination with the use of balanced lines will reduce the possibility of noise pickup in those lines 2 7 Impedance and Termination for 600 Ohm Lines...
Page 10: ...10 as it is connected in the system and adjust the Output Level control to achieve the system reference level at the output of the 7110 as read on an external referencejneler Then adjust the trimpot i...
Page 11: ...fore soldering bend two opposite corner leads over to provide a good mechanical mounting Check to make sure that the transformer will not move Solder all pins of the transformer 5 Reinstall top and bo...
Page 12: ...s By the definition just given the 7110 may be considered a compressor or a limiter depending on the position of the ratio control This manual will generally use the phrase compression to mean either...
Page 13: ...n has fallen below the threshold levej The release time of the average responding section of the 7110 is also variable from 50 milliseconds to 2 seconds for 1 0 dB of release As noted above the 7110 a...
Page 14: ...But a 20 dB decrease will likely not be especially if the offending high amplitude signal is present only occasionally We could try to coritrol this by hand but if the situation occurs with regularit...
Page 15: ...tch the input level and give you an idea of where the signal level is relative to the threshold level For example if the meter is reading 20 and the Threshold control is set to 10 the average signal i...
Page 16: ...le of this is known as ducking In this application the compressor is used to reduce the level of one signal whenever another more important signal is present The example most used is that of an announ...
Page 17: ...set for 100 mV of control change for 1 dB of level change 4 3 Output Amplifier Following the gain reduction VCA IC3 drives current boosting transistors Q4 and Q5 through diodes CR2 and CR3 Resistors...
Page 18: ...t source Q8 The comparators are arranged in such a manner that an input voltage lower than threshold causes the comparator output to be low sinking current for all LEDs lower in the string and simulta...
Page 19: ...please call or write to the Customer Service Department at the Service address listed on the title page of this manual for a Return Authorization Number All products returned to theJactQryjnust be acc...
Page 20: ...load 20 Hz 20 kHz 1 dB 20 Hz to 20 kHz 20 dB Average Detector Adjustable 1 50 milliseconds Peak Detector Fixed less than 100 microseconds Adjustable 100 milliseconds to 5 seconds for 10 dB of release...
Page 21: ...LICATION 1 UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCES ARE FRACTIONS DECIMALS ANGLES It XX It It I XXX It DO NOT SCALE DRAWING CONTRACT NO APPROVALS DATE J SWAN SON CHECKED W i i IS...
