Behringer MX9000 user manual Looming problems, Bay

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Bay 8:

L7 & R8 equals the L/R recording input to the 2-tracks. On Bay 8 we have hard-wired these to recording outputs 1 to 6 in order to drive all recorders simultaneously. Copying from any 2-track source to all recorders may be done by patching the source outputs into L7 and R8.

We have assumed you have a HiFi amp available to enable a variety of secondary sources to be condensed into the XTRN (external) input for easy monitoring selection via the HiFi amp’s input selector switch, if you want to record from any of these sources, best patch direct from the individual outputs (17 to 22) rather than the HiFi amp mix (15 and 16) for the cleanest result. (The exception being vinyl, which will need to use the HiFi amp’s RIAA pre-amp to present the mixer with a flat response signal).

Fig. 8.2: Wiring for bay 8 (for advanced wiring scheme refer to section 11)

8.3 Looming problems

Loom wiring is an art unto itself, and it is worth taking time out to get it right. First off, it is important to avoid earth loops. (A looped wire acts as an ariel, picking up electromagnetic radiation.) Think of a tree. Every part of that tree is connected to every other part, but only by one route. That’s how the total earth picture for your entire studio should look. Don’t take the earth off your power cable plug to reduce audible 50 Hz mains hum (or it’s harmonics). Rather you should be looking at disconnecting the signal screen somewhere.

You could do worse than ensure that all screens are commoned at the patchbay in which case all unearthed equipment would pick up earth from this point via a single screen (more than 1 route = an earth loop), while mains-earthed equipment would have all screens cut at the equipment end.

+Some quality equipment has an independent signal and mains earth. In this case at least one, and possibly all, screens should carry earth to the equipment. Sometimes the only way to find out is “suck and see”.

Take care to ensure that using the patchbay does not disturb the studio’s earth architecture. Always use short as possible patch leads with the screen connected at both ends.

If you’re really serious about hum levels, you could run balanced lines wherever appropriate. The earth wiring scheme would be the same as before. By shorting the ring to the barrel for all balanced jack sockets connected to unbalanced equipment, you could use balanced patch leads throughout. (There is no percentage in wiring a balanced output to a balanced input with a mono patch cord!) (See section 12 “(UN)BALANCED LINES”.)

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Contents EURODESKMX9000 Safety Instructions Foreword Table of Content Track Recording with 2 Samplers Manual Eurodesk OverviewPSU Power Supply Unit MeteringChannel strip Input switchingINPUT/OUTPUT Channel Input gain setting Channel input switching architectureMain equalizer Aux sendsRouting and muting Aux sendsChannel RoutingInserts B-channelSubgroup and Direct Outputs SubgroupsStereo subgroup channel schematic Master Panel Direct outputsAux masters Aux sendsAux returns Stereo aux returns Solo MIX-B masterAux returns 1 Monitoring MonitoringHeadphones PhonesTalkback 1 PFLExpander port bus inputs ConnectionsRear panel Auxiliary sends Auxiliary returnsSubgroup inserts Track in/outTrack/external inputs Main insertsStereo outputs Phones 1/2Meter/analyzer out Master balanced outputsPlug soldering guide Page Page Patchfield PatchfieldNormalized bay Example of patchbay configurations Looming problems BayEqualization Gain Optimization Impedances and Tuning Unbalanced LinesA balanced microphone line START-UP Channel setting up procedureDesk/tape setting up procedures Track Midi SUITE/DANCE Production Studio Multitrack initialization13.2.3Recording levels 13.2.4Auditioning a mixAlternatively Auxless headphones mixSends Slightly more complicated auxless headphones mix ReturnsTrack Recording with 2 Samplers Lining up record/sample inputsMixdown RecordingHeadphones Professional 24-TRACK StudioVery tricky headphones Tab .1 Channel assignmentWet monitoring Live P.A. with 2-TRACK Recording FOHLive Concert with 24-TRACK Recording Tab .2 Front/rear/stage monitors routing Expanding the Eurodesk MX9000 TimecodeConnections AlignmentHowever BouncingSequencing Live INPUT/OUTPUT Configuration ModificationsLED meters pre fader Aux sends post EQMIX-B source post fader Specifications General Power supplyDimensions/weight Warranty § 1 Warranty CARD/ONLINE RegistrationPage
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