Spacebar Modular System User Manual
Contents
1. User Manual Revision A October 2009 The Grace Design Spacebar modular microphone positioning system allows for precise and repeatable setting of microphone capsule spacing and angle of incidence in a wide array of microphone configurations With precision scales for angle and distance engraved on the Spacebar components it becomes easy to make perfectly repeatable stereo and multichannel microphone setups The Spacebar modular system components can be purchased in pre configured assemblies for several standard microphone arrays As well it is possible to build a virtually limitless range of microphone holding structures to meet any need Spacebar Modular System User Manual Page 1 of 29 Revision A Table of Contents Standard pre conngured AMO ri ii iii ri ies 3 1SB SUR SUMTOUNO TE a ri al Dl chen Doa 3 2 SB DT Decca o lt a ee ee ee ee eee eee eee 3 E407 530m Da dolida 5 E414 tube end plU meee ne eee Pe a tr a er ar wee a erree 5 Ur UT UNV le ns AS 7 E toa Ree tes ea a Re aaa ead 9 E o e AA AN SR eee ee OPE NEON AAA EA UCSC ley ON RATER Fe 10 4 AB Stereo i hes Senet cata a et cia eae mend aaa nb area ee ena edad a E 12 9 SB 100 1 meter AB Da ct hs acne aa ora ic te et neat ch ee at o 34 FREVISION MISTONecitsactretaanieatinrdeazichiusicphteetethadhe indents nin a aaa hea aia aaia i ae barai iai aa inii 35 Spacebar Modular System User Manual Page 2 of 29 Revision A Standard pre configured a2. Button Head Cap Screw 2 6 E423 Cable Clip for 7 8 tube 4 7 SB SMA Stand Mount Adapter 1 Spacebar Modular System User Manual Page 28 of 29 Revision A Revision history Rev Description Date Initials A Initial release 10 07 09 MBG Spacebar Modular System User Manual Page 29 of 29 Revision A
3. Drawing 2 Decca Tree See the SB DT system exploded parts diagram for a list of included components 3 Blumlein The Blumlein stereo micing technique was pioneered by Alan Blumlein in the 1930s The Spacebar Blumlein configuration allows for holding two figure 8 microphones on the same vertical axis and at a precise 90 degree angle of incidence Two types of mic holder are available depending on the microphones being used For RCA 44 and RCA 77 type mics and their derivatives the SB AMHRA holder should be used Most other microphones can be mounted with the SB MH standard mic holder A unique feature of the Spacebar Blumlein configuration is that the whole vertical tube assembly can be rotated on a horizontal axis allowing the mics to be aimed up or down relative to the horizontal plane This can be very useful when micing and ensemble from above on a tall stand Spacebar Modular System User Manual Page 9 of 29 Revision A Drawing 3 Blumlein with SB AMHRA right angle mic holders shown with RCA 44 type mics See the SB BLRA system exploded parts diagram for a list of included components q Drawing 4 Blumlein with SB MH standard mic holders See the SB BL system exploded parts diagram for a list of included components Spacebar Modular System User Manual Page 10 of 29 Revision A 4 AB Stereo The AB Ste
4. H434 10 32 x 1 2 Button Head Cap Screw 4 7 E423 Cable Clip for 7 8 tube 6 8 SB TJ90 90 Degree Tube Joiner 1 9 SB SMA Stand Mount Adapter 5 8 27 Threads 1 10 H522 S Hook 13 64 Dia 2 Spacebar Modular System User Manual Page 25 of 29 Revision A SB BL Blumlien ITEM NO Grace Part DESCRIPTION QTY 1 E422 Stand Mount Right Angle 1 2 SB TJ90 90 Degree Tube Joiner 1 3 E405 24mm Nut 10 32 Thread 3 4 H436 10 32 x 7 8 FLSC SS 3 5 H402 8 32 x 1 4 Flat Head Machine Screw 2 6 SB MH Mic Holder 2 7 E414 End Plug for 0 626 ID tube 2 8 E407 Tube 53cm x 875 0D x 625 ID 1 Spacebar Modular System User Manual Page 26 of 29 Revision A 8 SB BLRA Blumlien right angle Grace Part DESCRIPTION QTY E422 Stand Mount Right Angle 1 SB TJ90 90 Degree Tube Joiner 1 E420 105 cm x 875 OD Tube 1 SB AMHRA Adjustable Mic Holder Right Angle 2 E405 24mm Nut 10 32 Thread 3 H436 10 32 x 7 8 FLSC SS 3 H402 8 32 x 1 4 Flat Head Machine Screw 2 E414 End Plug for 0 626 ID tube 2 Spacebar Modular System User Manual Page 27 of 29 Revision A 9 SB 100 1 meter AB bar ITEM NO Grace Part DESCRIPTION QTY 1 E420 105 cm x 875 OD Tube 1 2 SB AMH Adjustable Microphone Holder 2 3 E414 End Plug for 0 626 ID tube 2 4 H402 8 32 x 1 4 Flat Head Machine Screw 2 5 H434 10 32 x 1 2
5. 0 32 x 3 4 Flat Socket Head Cap Screw INIO AIA OIN gt H447 10 32 x 3 16 Cup Point Set Screw o H512 Adjustable Handle 10 32 x 78 stud o H448 10 32 x 3 8 Socket Low Head Cap Screw H515 5 8 27 24mm Nut e N E412 Adjustable Mic Holder Tube Clamp o H445 10 Wave washer crescent e SS el AS eS Page 19 of 29 Revision A 2 SB MH Standard Mic Holder Spacebar Modular System User Manual Apply Locktite 242 ITEM NO Grace Part DESCRIPTION QTY E408 Mic Holder 7 8 Tube Clamp H514 5 8 27 Threaded Boss H520 Round Pin 1 16 x 3 H436 10 32 x 7 8 FL SC SS H459 1 4 20 Flat Washer Bronze H512 Adjustable Handle 10 32 x 78 stud N OOOI AOIN gt H515 5 8 27 24mm Nut e e AAN AS Page 20 of 29 Revision A 3 SB TJ90 90 Degree Tube Joiner Grace ITEM NO Part DESCRIPTION QTY 1 E415 90 Degree Tube Joiner 1 2 H512 Adjustable Handle 10 32 x 78 stud 2 3 H459 1 4 20 Flat Washer Bronze 2 Spacebar Modular System User Manual Page 21 of 29 Revision A 4 SB AMHRA Adjustabe Mic Holder right angle Apply Locktite 242 gt Grace ITEM NO Part DESCRIPTION QTY 1 E413 Mic Holder Right Angle 3 4 Tube Clamp 1 2 E405 24mm Nut 10 32 Thre
6. ad 1 3 H520 Round Pin 1 16 x 3 2 4 H514 5 8 27 Threaded Boss 1 5 H512 Adjustable Handle 10 32 x 78 stud 1 6 H459 1 4 20 Flat Washer Bronze 1 7 E417 Adjustable Mic Holder Top 1 8 H436 10 32 x 7 8 FL SC SS 2 9 H515 5 8 27 24mm Nut 1 Spacebar Modular System User Manual Page 22 of 29 Revision A 5 SB SMA Stand Mount Adapter with 5 8 27 threads A Grace ITEM NO Part DESCRIPTION QTY 1 E416 Stand Mount 5 8 27 Threads 7 8 Tube Clamp 1 2 H512 Adjustable Handle 10 32 x 78 stud 1 3 H459 1 4 20 Flat Washer Bronze 1 Spacebar Modular System User Manual Page 23 of 29 Revision A 6 SB SUR Surround Tree ITEM NO Grace Part DESCRIPTION QTY 1 E420 105 cm x 875 OD Tube 2 2 SB AMH Adjustable Microphone Holder 5 3 E414 End Plug for 0 626 ID tube 6 4 H402 8 32 x 1 4 Flat Head Machine Screw 6 5 H434 10 32 x 1 2 Button Head Cap Screw 6 6 SB TJ90 90 Degree Tube Joiner 2 7 SB SMA Stand Mount Adapter 1 8 E407 Tube 53cm x 875 0D x 625 ID 1 Spacebar Modular System User Manual Page 24 of 29 Revision A 7 SB DT Decca Tree a Q 8 ay A 9 ay bs a Po 5 9 ITEM NO Grace Part DESCRIPTION QTY 1 E420 105 cm x 875 OD Tube 3 2 SB AMH Adjustable Microphone Holder 3 3 E418 Tube Joiner Bar 1 4 E414 End Plug for 0 626 ID tube 4 5 H402 8 32 x 1 4 Flat Head Machine Screw 6 6
7. be made by slipping the mono filament line through the shrink tubing to shorten one side of the yoke while effectively lengthening the other Spacebar Modular System User Manual Page 16 of 29 Revision A Drawing 11 Guide Line Yoke The ends of the yoke guide lines attach to the s hooks on the ends of whatever bar is being used The s hooks supplied with your Spacebar system must be mounted to the end plugs of the tube with the supplied 10 32 x 1 2 button head cap screw Use a 1 8 hex wrench Do not tighten the screw so much that it binds the s hook The screw has a thread locking compound applied to its threads so it will not loosen after screw is installed Spacebar Modular System User Manual Page 17 of 29 Revision A Drawing 12 Bar end s hook installation Drawing 13 guide line yoke attachment The vertical angle of the array can be adjusted by moving the stand mount adapter forward or rearward of the balance point Spacebar Modular System User Manual Page 18 of 29 Revision A EXPLODED PARTS DIAGRAMS 1 SB AMH Adjustable Mic holder Apply Locktite 242 Spacebar Modular System User Manual ITEM NO Grace Part DESCRIPTION o 2 E417 Adjustable Mic Holder Top H459 1 4 20 Flat Washer Bronze H432 10 32 x 1 4 SK CP SS H510 Knob Black 5 8 H514 5 8 27 Threaded Boss H520 Round Pin 1 16 x 3 H446 1
8. holes allowing for proper centering of cross bars and measurement between cross bars and microphone holders The scales on the various bars are indicated as follows e E420 indicated in centimeters and reads O to 105cm from left to right and 105 to Ocm right to left e E421 indicated in centimeters and reads 40 0 40cm Spacebar Modular System User Manual Page 14 of 29 Revision A e 407 indicated in centimeters and reads 25 0 25cm from the center 2 E418 Tube Joiner The E418 tube joiner is used to connect any two of the 7 8 diameter tubes Typically used for the 2 meter segment of the Decca Tree or for very wide stereo bars To join two tubes simply slide the tube joiner bar into one of the tubes and secure with the 8 32 x 1 4 flat head screw Next slide the second tube over the joiner bar and secure with the other screw See diagram below Drawing 9 E418 tube joiner bar assembly 3 SB HB Hanging Bar The SB HB assembly threads into the SB SMA stand mount adaptor as shown below Spacebar Modular System User Manual Page 15 of 29 Revision A Drawing 10 SB HB assembly When hanging the microphone array can be aligned to the sound source by attaching the supplied guide line yoke to the ends of the 7 8 tubes With user supplied line the yoke can be tied to an appropriate anchor point in the venue These yoke lines are adjustable so that the microphone array can be precisely aimed Adjustments can
9. r System User Manual Page 12 of 29 Revision A Drawing 7 SB AMH Adjustable Mic Holder The angle of incidence of amounted microphone can be precisely set by using the angle indicating protractor markings which are engraved on the front of the SB AMH The angle is indicated from 90 to 90 degrees in 5 degree increments The angle adjust thumb screw must be loosened before rotating the upper portion of the microphone holder Spacebar Modular System User Manual Page 13 of 29 Revision A SB AM o o cm o poo o o o a o y 11 5040 30 20 10 O 10 20 30 40 0 1 Drawing 8 SB AMH Adjustable Mic Holder showing protractor markings and sight hole To calibrate the angle of incidence follow these steps A Loosen locking thumb screw and rotate mic holder so that 0 degrees is indicated Then re tighten the thumb screw B Thread on the microphone clip and orient it so that it is perpendicular to the Spacebar tube C Lock the microphone clip in place by tightening the jam nut against it D Now the angle of the microphone can be precisely adjusted by loosening the thumb screw and rotating the microphone The location of the microphone holder can be precisely set by using the scales that have been engraved on the tubes The SB MH and SB AMH feature a sight hole that allows microphone holder to be positioned on the centimeter indicator circles The SB T 90 tube joiner also has sight
10. reo microphone technique typically uses two omni directional microphones spaced apart by a distance The SB 100 configuration is basically a 1M wide stereo bar With the addition of another E420 tube and a E418 joiner tube the SB 100 becomes an SB 200 2 meter stereo bar cl h 105cm Drawing 5 SB 100 See the SB 100 system exploded parts diagram for a list of included components 5 Hanging Arrays For applications that require hanging a microphone array from a ceiling the SB HB hanging bar can be used The SB HB can be used with the SB SUR surround tree SB DT Decca tree and the SB 100 AB bar The SB HB has a 1 inch eye bolt on one end and threads into the SB SMA stand mount adapter at the other Spacebar Modular System User Manual Page 11 of 29 Revision A Drawing 6 Decca Tree with SB HB Hanging Bar Setup Basics 1 SB AMH SB MH All of the modular microphone holder assemblies use adjustable clamping handles to tighten and loosen the holder from the tube it is mounted on Turning the handle clockwise will tighten or clamp the holder in position on the tube The clamping action is very secure and does not require extreme torque on the handle As well the final position of the handle can be adjusted by pulling on the handle while rotating This allows the handle to be adjusted so that it can be at a convenient angle for tightening or loosening Spacebar Modula
11. rom 304 stainless steel Very strong Spacebar Modular System User Manual Page 5 of 29 Revision A 10 E420 105cm bar 11 E421 80cm bar 12 E422 90 degree stand mount 13 E405 42mm thumb nut w 10 32 x 7 8 screw Note All components which feature microphone mounts come standard with 5 8 27 American standard threads As well all microphone mounts can be ordered with the European standard 3 8 16 British Standard Whitworth threads These part numbers will have a BSW suffix The Spacebar modular system components are precision fabricated from machined aircraft aluminum brass and stainless steel If properly cared for it should last a lifetime Spacebar Modular System User Manual Page 6 of 29 Revision A Spacebar Configurations Detail 1 Surround Tree The micropho SB SUR system allows for mounting of 5 microphones In its standard configuration three nes can be mounted as a front triplet and two microphones can be mounted as a rear pair All microphone spacings can be precisely adjusted using the engraved centimeter scales on the bars Also all microphone angles of incidence can be precisely adjusted in 5 degree increments The the front left and right microphone ho F420 105cm bar and 6cm to 50cm For Surround microphone arrays using www mmad info This website was created by Michael Williams who has written much about multichannel microphone a
12. rray design It contains an interactive design decision sequence for tailoring your microphone configuration to your specific acoustic venue The underlying theory for this design approach is contained in a series of AES papers written by Michael Williams Spacebar Modular System User Manual der spacing can be adjusted from 6cm to 102cm if using E407 53cm bar the SB SUR system we highly recommend visiting http Page 7 of 29 Revision A r5 al e 105cm 53cm a q_ o mo O mo p GarO W T Orm 1 I 105cm Drawing 1 Surround Tree See the SB SUR system exploded parts diagram for a list of included components 2 Decca Tree This classic microphone configuration was developed by Decca Records engineers in the 1950s The Spacebar Decca Tree configuration provides a simple precise and easy to set up solution for this technique The standard Spacebar Decca Tree comes with three E420 1 meter tubes an SB SMA 5 8 27stand mount adapter and three SB AMH adjustable mic holders These are configured to provide a 2 meter spacing between left and right microphones and a center microphone 1 meter forward Since the stand mount adapter can move front to back on the 1 meter tube it should be located at the balance point for maximum stability Spacebar Modular System User Manual Page 8 of 29 Revision A 105cm Qor Al El E E 210cm
13. rrays 1 SB SUR Surround Tree Holds 5 microphones 2 SB DT Decca Tree Standard 3 microphone tree 2M x 1M or 3 SB BL Blumlien Holds standard large diaphragm microphones in a vertical Blumlien configuration 4 SB BLRA Blumlien right angle Holds RCA 44 type ribbon microphones in a vertical Blumlien configuration Ole 5 SB 100 1 meter AB bar Straight 1 meter stereo bar Can be extended to 2 meters Spacebar Modular System User Manual Page 3 of 29 Revision A Spacebar modular components 1 SB AMH Adjustable Mic Holder Mic holder with precision angle scale 5 degree markings from 90 to 90 degrees 2 SB MH Mic Holder Standard mic holder A 3 SB AMHRA Adjustable Mic Holder Right Angle 4 SB HB Hanging Bar Spacebar Modular System User Manual Page 4 of 29 Revision A 5 SB TJ90 90 Degree Tube Joiner Allows any two 7 8 tubes to be joined at a 90 degree angle 6 SB SMA Stand Mount Adapter with 5 8 27 thread Comes with 3 8 16 European style thread adapter 7 E407 53cm bar 7 8 diameter LASER etched scale reads 25 0 25cm 8 E414 tube end plug Attaches to the end of any of the 7 8 tubes Provides a threaded hole for attaching hooks for guide lines or an E414 24m thumb screw to provide a safety stop for microphone holders 9 E418 Tube Joiner Joins any two 7 8 tubes Made f
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