Chandler Limited® RS124 Compressor User Manual
Contents
1. 4 3 2 I 0 6 7 8 9 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 4 2 I 7 8 9 6 1 0 0 B 1 6 0 0 0 A 5 N O F O F FUSE dB COMPRESSION 3 0 0 2 0 1 5 1 0 5 V O C E R Y E R H OL D 3 6 4 5 I 2 F T S A O S L W 4 3 2 I 0 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T A T T A U d B T T A C A K 4 3 2 I 0 6 7 8 9 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 6 0 4 2 I 7 8 9 0 0 B 7 6 1 0 0 B 1 6 0 0 0 A 5 N O F O F FUSE 6 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited ATTACK Chandler Limited s RS124 Compressor provides adjustable attack time via the stepped switch labeled ATTACK a feature not available on historic units There are nine attack time settings available the fast est setting is achieved at the far left position labeled 1 each subsequent position is slower The Chandler Limited RS124 includes three favor ite historic RS124 compress2. ALL IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND OR ANY WARRANTY WITH REGARD TO ANY CLAIM OF INFRINGEMENT THAT MAY BE PROVIDED IN SECTION 2 312 3 OF THE UNIFORM COMMERCIAL CODE AND OR IN ANY OTHER COMPARABLE STATE STATUTE LIMITATION OF LIABILITY THE LIABILITY OF CHANDLER LIMITED IF ANY AND PURCHASER S SOLE AND EXCLUSIVE REM EDY FOR DAMAGES FOR ANY CLAIM OF ANY KIND WHATSOEVER REGARDLESS OF THE LE GAL THEORY AND WHETHER ARISING IN TORT OR CONTRACT SHALL NOT BE GREATER THAN THE ACTUAL PURCHASE PRICE OF THE PRODUCT WITH RESPECT TO WHICH SUCH CLAIM IS MADE IN NO EVENT SHALL CHANDLER LIMITED BE LIABLE TO PURCHASER FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND INCLUDING BUT NOT LIMITED TO COMPENSATION REIMBURSEMENT OR DAMAGES ON ACCOUNT OF THE LOSS OF PRESENT OR PROSPECTIVE PROFITS OR FOR ANY OTHER REASON WHATSOEVER
3. Chandler Limited is not responsible for damage resulting from improper packing and or mishandling by a shipper If sent by UPS or Federal Express ship to Chandler Limited 222 South Cherry Street Shell Rock IA 50670 If sent by Postal Service ship to Chandler Limited PO Box 38 Shell Rock IA 50670 The foregoing expresses Chandler Limited s obligations and liabilities with respect to the quality of the product its components and accessories All other warranties express or implied including the warranties of merchantability or fitness for a particular purpose are disclaimed Chandler Limited shall not be liable for the loss or use of the product its components and accessories inconvenience loss or any other damages direct or consequences arising out of the use of or inability to use the product or its components or damages resulting from or attributable to defects in the products or its compo nents No one other than Chandler Limited has authority to extend or modify the terms of this limited warranty in any manner whatsoever 11 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited DISCLAIMER OF WARRANTY EXCEPT FOR THE FOREGOING WARRANTIES CHANDLER LIMITED HEREBY DISCLAIMS AND EX CLUDES ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY AND OR
4. is a mono tube com pressor and incorporates an extended feature set over the original equipment Each historic Abbey Road Studios RS124 com pressor is unique in more ways than one and Chandler Limited s incarnation of the equipment includes the three favorite original units still in use at the historic studios in one device for the first time Your Chandler Limited RS124 Compressor has been carefully crafted and built by hand at Chandler Limited in Shell Rock IA U S A using through hole components for the ultimate analog experience At Chandler Limited we are proud of our Ameri can made products and we hope you like them Please feel free to call our shop anytime for help or questions Phone 319 885 4200 HISTORY First designed in 1960 by Abbey Road Head of Technical Bill Livey Deputy Head Len Page and seasoned EMI Audio Designer Mike Batchelor the EMI RS124 compressor is one of the most coveted pieces of recording gear ever devel oped During the late 1950 s EMI acquired Altec 436B compressors and soon realized the units were insufficient for critical recording applications Livey Page and Batchelor worked to modify the Altecs to meet their standards and ultimately ended up designing an entirely new compressor in the process the EMI RS124 The RS124 was popular with Abbey Road Stu dios engineers The RS124 added its unique character to single instruments rhythm busses and entire mixes So int
5. For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited V O C E R Y E R H OL D 3 6 4 5 I 2 F T S A O S L W 4 3 2 I 0 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T A T T A U d B T T A C A K 4 3 2 I 0 6 7 8 9 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 6 0 4 2 I 7 8 9 0 0 B 7 6 1 0 0 B 1 6 0 0 0 A 5 N O F O F FUSE dB COMPRESSION 3 0 0 2 0 1 5 1 0 5 Chandler Limited RS124 Compressor User Manual OFFICIAL EQUIPMENT 2 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited Chandler Limited RS124 Compressor User Manual Thank you for purchasing the Chandler Limited RS124 Compressor you now own a piece of EMI Abbey Road Studios official equipment The Chandler Limited RS124 Compressor is a recreation of the rare EMI Abbey Road Studios RS124 and reimagined for the modern era The Chandler Limited RS124
6. cing circuit BAL including a neon bulb momentary switch and trim pot was added to the RS124 When the momentary switch was activated a ticking sound was sent to both ampli fiers with one being phase reversed If the circuit in a balanced state the ticking would be canceled out Otherwise the engineer would adjust the trim pot until the audible ticking was virtually removed This allowed for convenient in session rebalancing of the compressor by the recording engineer in a matter of seconds V O C E R Y E R H OL D 3 6 4 5 I 2 F T S A O S L W 3 2 I 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T A T T A U dB T T A C A K 4 3 2 I 0 6 7 8 9 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 6 0 4 2 I 7 8 9 0 0 B 7 6 1 0 0 B 1 6 0 0 0 A 5 N O F O F FUSE dB COMPRESSION 3 0 0 2 0 1 5 1 0 5 5 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited INPUT CONTROL The INPUT CONTROL is variable and allows adjustment of input signals applied at the XLR input connector on the rear of th
7. e compressor The INPUT CONTROL is labeled 0 to10 from left to right The RS124 is a variable transconductance compression cir cuit Clockwise adjustment of the INPUT CONTROL simulta neously raises incoming signal level while lowering the com pressor s threshold and increasing the amount of compression applied to the source material Counterclockwise rotation of the INPUT CONTROL simulta neously reduces incoming input level while raising the thresh old and lowering the amount of compression applied to the source material NOTE If switched input control is desired it can be pre or dered at time of purchase for an additional fee from an autho rized Chandler Limited dealer OUTPUT ATTENUATOR db The OUTPUT ATTENUATOR db control is vari able use this control to lower the overall output level of the RS124 Rotation in a counterclockwise motion from right to left beginning at 0 and con tinuing to 10 will attenuate the output signal of the RS124 to the desired level NOTE If a switched output attenuation control is desired it can be pre ordered at time of purchase for an additional fee from an authorized Chandler Lim ited dealer V O C E R Y E R H OL D 3 6 4 5 I 2 F T S A O S L W 4 3 2 I 0 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T A T T A U d B T T A C A K
8. egral to the recording mixing and mastering process a pair can be seen in almost every control room photo in Ab bey Road during the 60s period Still in use today at Abbey Road Studios and most recognized for its use at virtually every Beatles session the RS124 s true inner workings have remained an enigma to recording engi neers until now OFFICIAL EQUIPMENT 3 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited CONNECTIVITY POWER The Chandler Limited RS124 Compressor features an internal power supply Connection is made us ing the supplied IEC power cable Power is preset internally to operate at either 120V or 220V INPUT OUTPUT On the rear panel of the RS124 compressor exists two XLR jacks wired pin 2 hot one for input and the other for output Both input and output connections are 4 transformer balanced Output impedance is 600 200ohms switchable both offer tonal and gain differences The 600ohms setting may be more amenable to the modern studio environment The 200ohms impedance setting was Abbey Road Studios standard STEREO LINK Chandler Limited RS124 Compressors are stereo linkable via a standard cable using the female connector available on the rear of the unit While Stereo Linked each compressors control set wou
9. l fashion Over time the push pull balance may become irregular and as a result unwanted artifacts will occur in the audio This is common to most tube based compressors including the RS124 When the push pull circuit becomes unbalanced it may exhibit subtle rumbling or distortion and modulation of the source signal this is more noticeable at quiet sections of music and low frequencies Located at the far left of the front panel is the BAL con trol set a circuit re balancing utility If the RS124 is suspected of having become unbalanced simply depress the silver colored mo mentary switch This action will induce a ticking sound heard in the monitors Use a small flathead screw driver and slowly adjust the trim pot located above the BAL label back and forth across the range until the ticking sound virtually disappears in the monitors Once the ticking sound is at its minimum audible level rebalancing of the RS124 has been achieved HISTORIC NOTE Early versions of the EMI Abbey Road Studios RS124 did not have front panel BAL functionality As a result when the circuit became unbalanced the compressor would have to be pulled during the session and rebalanced by Abbey Road technical staff This was scenario was cumbersome and the resultant session interruption not ideal Abbey Road engineer Len Page had a proverbial Light Bulb moment coming up with an ingenious modification A small balan
10. ld still be managed individually ON OFF Cycling power to the RS124 is achieved by turning the ON OFF power switch located far right of the front panel to the desired position When the RS124 is powered on the jewel light on the front panel will illuminate V O C E R Y E R H OL D 3 6 4 5 I 2 F T S A O S L W 4 3 2 I 0 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T A T T A U d B T T A C A K 4 3 2 I 0 6 7 8 9 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 6 0 4 2 I 7 8 9 0 0 B 7 6 1 0 0 B 1 6 0 0 0 A 5 N O F O F FUSE dB COMPRESSION 3 0 0 2 0 1 5 1 0 5 OUTPUT INPUT MAINS VOLTAGE 110 120V 220 240V LINK TIP CV SLEEVE 0v E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 FUSE 25 AMP SLO BLO OUTPUT IMPEDANCE 200 600 FUSE Chandler Limited RS124 000001 4 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited BAL In any push pull amplifier one side pushes waveform while the other side pulls it in an equa
11. lfunctions i e resulting from power surges shorted or overloaded circuits etc use of any power source other than supplied by manufacturer repair by anyone other than an authorized Chandler Limited representative or damage resulting from improper packing or mishandling by a shipper 2 Normal wear and tear of parts 3 Shipping handling packaging and delivery costs of the product Who Is Covered The original purchaser Repair During The First Year During the first year all defective product components that are cov ered by this Limited Warranty will be repaired free of charge including parts and labor The purchaser will pay shipping costs AND a 35 handling fee per unit What You Must Do for Warranty Service in the United States If you live in the United States and your product was purchased through a U S Dealer please contact your dealer OR call 319 885 4200 or e mail support chandlerlimited com What You Must Do for Warranty Service outside of the United States For warranty service if you live outside of the United States please contact the dealer where you purchased the product Any products returned to Chandler Limited for repair should include 1 complete description of the problem 2 name address phone number fax number and or e mail address 3 receipt of original purchase 4 power supply and all accessories and cables The purchaser is responsible for the ship ping costs to and from Chandler Limited
12. ndlerlimited com for a list of authorized International Distributors CE Certification Chandler Limited declares under its sole responsibility that all products manufactured by them are in compliance with Electromagnetic Compatibility EMC Directive 2014 30 EU Standards EN55103 1 2009 A1 2012 EN55103 2 2009 EN55013 2013 and Low Voltage Directive LVD 2014 35 EU Standards EN60065 2002 A1 2006 A11 2008 A2 2010 A12 2011 10 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited Product Limited Warranty During the first year from the date of the original purchase this product is warranted to be free from defects in materials and workmanship under normal use service and maintenance This warranty ap plies to the original purchaser and is subject to the following terms and conditions What Is Covered The product s components as originally installed by the manufacturer that are de fective in materials or workmanship under normal use service and maintenance What Is Not Covered By This Warranty This warranty does not extend to or cover 1 Any defect due to the negligence of others failure to install operate or maintain the product properly unreasonable use accidents alteration use of unauthorized or non standardized parts acts of God theft vandalism electrical ma
13. nformation visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited METER The Chandler Limited RS124 features compres sion level monitoring facilities via the large db COMPRESSION meter located at center of the front panel The db COMPRESSION meter illustrates the amount of compression applied to the incoming signal and is labeled right to left 0 to 30db When compression is induced the db COM PRESSION meter s needle will move from right to left indicating the amount of gain reduction applied to the source signal NOTE The meter will move faster or slower de pending upon attack and recovery time settings However the meter is analog and ultimately slow in nature as a result the amount of com pression applied to the source signal may be greater than visibly observed SUPERFUSE Available on the far right of the RS124 front panel exists what appears to be a fuse cap it is not it is in fact a switch This switch disguised as a fuse cap is a feature dubbed the SuperFuse Turning the switch to the left will activate Su perFuse mode and the RS124 power jewel light becomes brighter indicating the feature has been engaged What is SuperFuse mode While we will not divulge the inner workings of this special feature it does change the personality
14. of EMI IP Limited MAINTENANCE TUBES From time to time replacing vacuum tubes may be necessary The RS124 compressor requires three vacuum tubes 6BC8 6CG7 and 6AL5 WARNING HIGH VOLTAGES are present Before replacing any tubes please power off the unit dis connect the power cable and wait 5 minutes for the voltage to discharge FUSE On the rear of the unit exists a circuit protection fuse If fuse replacement is required cycle the pow er switch to OFF and use a 250mA Slow blow type 9 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks of EMI IP Limited U S SERVICE Prior to sending in your gear for repair please contact our shop at the number below We will assist you in troubleshooting the problem and if needed we will issue you an RMA to send in the gear Send repairs to Chandler Limited Inc Attention Repairs 222 S Cherry St PO Box 38 if sending via the postal service Shell Rock IA 50670 Phone 319 885 4200 Email support chandlerlimited com INTERNATIONAL SERVICE Repair of Chandler Limited products purchased outside of the United States is provided by local or regional authorized Chandler Limited distributors To obtain service or repairs please contact your local dealer or regional distributor for further instruction Visit cha
15. of RS124 to become faster and more aggressive overall When activated the source material may become more lively and appear to jump out of the monitors WARNING SuperFuse is addicting H 6 4 5 O S L W 4 3 2 I 0 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T T A U d B 4 3 2 I 0 6 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 6 0 4 2 I 0 0 B 7 6 0 N O F O F FUSE dB COMPRESSION 3 0 0 2 0 1 5 1 0 5 V O C E R Y E R H OL D 3 6 4 5 I 2 F T S A O S L W 4 3 2 I 0 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T A T T A U d B T T A C A K 4 3 2 I 0 6 7 8 9 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 6 0 4 2 I 7 8 9 0 0 B 7 6 1 0 0 B 1 6 0 0 0 A 5 N O F O F FUSE dB COMPRESSION 3 0 0 2 0 1 5 1 0 5 8 For more information visit www chandlerlimited com 2015 Chandler Limited Inc All Rights Reserved RS124_UM_102515 Abbey Road Studios EMI RS and their associated logos are trademarks
16. ors still in use at Abbey Road Studios today in a single unit for the first time ever Included amongst the nine attack options are three positions marked in red These red colored settings reflect the serial numbers 60070B 60050A and 61010B of historic RS124s To dial up one of Abbey Road s favorite historic RS124s simply set the AT TACK switch to the desired serial number HISTORIC NOTE Each historic RS124 was unique exhibiting its own character and personality varianc es between units were enough so that Abbey Road engineers would request a specific serial numbered unit depending upon the source material it was to be applied to Furthermore historic EMI Abbey Road Studios RS124s featured a fixed attack time i e the attack timing was hardwired internally to a set time constant Overall not all RS124s shared the same values RECOVERY RECOVERY is an eleven position stepped switch which controls the compression release time The RECOVERY switch provides six recovery or release time options starting left to right and from slowest 6 to fastest 1 including five identical HOLD positions denoted by a red colored dot Adjusting the RECOVERY switch to any of the HOLD positions will keep the source signal com pressed to the most recently processed peak level HISTORIC NOTE The HOLD feature was an ingenious way to prime or preset the compression level of the incoming signal as a wa
17. y to overcome potential processing issues During mastering to prevent abrupt compression onset at the beginning of a track Abbey Road engineers would roll tape forward to the highest peak level and set the RS124 to the nearest avail able HOLD position from the desired RECOVERY setting Now with the compression level held or preset the engineer would rewind the tape and begin from the top of the track and any artifact of initial compression onset was removed Another use of the HOLD facility was to prevent level in rush when there was a precipitous drop in level during quiet passages of a track below the compression threshold Here again engineers would switch the RECOVERY control to the nearest HOLD position until the quiet passage had passed before setting it back to the previous release value V O C E R Y E R H OL D 3 6 4 5 I 2 F T S A O S L W 4 3 2 I 0 6 7 8 9 5 I0 I N P T U O N C R L T O O T P T U R O U N E T A T T A U d B T T A C A K 4 3 2 I 0 6 7 8 9 5 I0 E M I L TD E R S P M O R S O C R T 4 Y PE S 2 1 6 0 4 2 I 7 8 9 0 0 B 7 6 1 0 0 B 1 6 0 0 0 A 5 N O F O F FUSE dB COMPRESSION 3 0 0 2 0 1 5 1 0 5 7 For more i
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