Retain all documentation for future reference. 3 Follow all instructions printed on unit chassis for proper operation. 4 Do not use the unit if the electrical power cord is frayed or broken. The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it. 5 Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is not defeated. 6 Damage caused by connection to improper AC voltage is not covered by any warranty. Service Information Do not open unit! Opening the unit will expose you to potentially dangerous voltages. There are no user serviceable parts inside. Equipment should be serviced by qualified service personnel when: A. The equipment has been exposed to rain. B. The equipment does not appear to operate normally or exhibits a marked change in performance. C. The equipment has been dropped, or the enclosure damaged. To obtain service: contact your nearest Crest Audio Service Center Distributor Dealer or Crest Audio at 201.475.4600 USA or visit for additional information. email techserve@crestaudio.com A This symbol is used to alert the operator to follow important procedures and precautions detailed in documentation. A This symbol is used to warn operators that uninsulated "dangerous voltages" are present within the equipment enclosure that may pose a risk of electrical shock. 7 Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid. 8 The power cord of equipment should be unplugged from the outlet when left unused for a long period of time. table of contents Introduction Thank you and congratulations on your purchase of your new Crest Audio X-Rack mixer.We're confident that you will enjoy many years of trouble-free service from it.You will quickly find that it fits into a wide variety of mixing applications with ease. Due to well thought out sets of features, coupled with intelligent circuit design and the highest standards in construction & workmanship, all Crest Audio console products excel above and beyond the competitor's products, in every area. This owner's manual covers the XRM X-Rack mixer. The XRM has 12 Mono inputs and 4 Stereo inputs, adding up to a total of 20 microphone inputs. Each input can feed any of 12 outputs. Please read this manual thoroughly and keep it handy for future reference. If you have any operating concerns that are not covered in this manual, or have application questions of any type, don't hesitate to contact Crest Audio directly either by phone, fax, or email. Here is our technical support contact information: Phone: (201) 475-4600 Fax: (201) 475-4677 Email: techserve@crestaudio.com Mono Input channels p. 7 Front panel controls and rear panel connections Stereo Input channels p.19 Front panel controls and rear panel connections Master section P .29 Solo and Monitoring System, Output Masters. Front panel controls and rear panel connectors. Specifications P. 41 1 2 3 4 8823вй5 XRM BLOCK DIAGRAM <5 BICOLOR GROUND COMP BALANCED POT FADER PAD LED LED ALL SWITCHES SHOWN IN THE UP (DESELECTED) POSITION AMP(LIFIER) GAIN SHOWN IN DB WHEN NEEDED WHEN SHOWN: 1/4" TRS SWITCHING JACKS HAVE NORMALLY CLOSED CONTACTS USER OPTIONS IMPLEMENTED WITH REMOVABLE LINKSANDSOLDER BLOBS DEFAULT OPTION POSITION SHOWN UNDERLINED FITTED SOLDER LINK BLOB USER OPTIONS SWITCH SWITCH "JACK” JACK FOR UNBALANCED OPERATION: TIE PIN 3TO PIN 1, USE PIN 2 FOR OUTPUT, PIN 1 FOR GND "0" SYMBOL INDICATES POLARITY REVERSE CABLE 40 WAY i— AFFECTSBOTH —i I STEREO LO-CUT I SOLO AND MONITOR CIRCUITS x J3 o € 3 (D V) 3 0) 3 c 0) XRM block diagram how to use this manual format This manual uses a format that is intended to be easy to read, yet technical for those who need to know all the details. For feature descriptions, this is done by devoting the left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a control closeup.These images all pertain to the features and control descriptions on the right side of the page.The intention is to make the manual easy to read while including all the technical details needed for getting the most out of the X-Rack - a compact, flexible, feature-rich addition to Crest Audio's growing line of audio mixing console products. conventions Control Icons This manual uses symbols to illustrate what the control descriptions are referring to.This makes it possible to avoid redundant wording and makes the control descriptions clean n Switch in the UP non-activated position -Q- Switch in DOWN, activated position Switch that illuminates when in the DOWN position All/// o Momentary switch that illuminates when activated LED that is on, indicating that it's associated feature is activated Potentiometer Standard 1/4" TRSjack (used for line level input...