Spacebar Modular System User Manual
Contents
1. 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 NO O01 B Go PO H515 5 8 27 24mm Nut AA d N Aa So Spacebar Modular System User Manual Revision C Page 19 of 29 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 Revision C Page 20 of 29 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 Thread 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 Revision C Page 21 of 29 SB SMA Stand Mount Adapter with 5 8 27 threads ue el 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 U2. E407 Tube 53cm x 875 OD x 625 ID 1 Spacebar Modular System User Manual Revision C Page 25 of 29 SB BLRA Blumlein Right Angle Grace Part DESCRIPTION QTY E422 Stand Mount Right Angle 1 SB TJ90 90 Degree Tube Joiner 1 E421 80 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 Revision C Page 26 of 29 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 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 Revision C Page 27 of 29 SB HB Hanging Bar Apply Loctite 242 Apply Loctite 242 gt ITEM NO PartNo DESCRIPTION QTY 1 E428 Hanging Bar 1 2 H521 5 8 27 Threaded Boss modified H514 1 3 H496 1 4 20 X 1 Flat Head Socket St Zn 82 Degree 1 4 H495 Eye bolt 1 4 20 X 1 Cut to 5 8 1 5 W500 1 16 DIA Shrink tubing Black 1 6 H524 Monofilament line 016 DIA for 1 meter bar 78 6 H524 Monofil
3. HB 2M with a guide line yoke sized for 2 meter wide bars HANGING CABLE GUIDE LINE YOKE SB HB HANGING BAR VERTICAL ANGLE ADJUST fig 6 Decca Tree with SB HB Hanging Bar Setup Basics 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 Modular System User Manual Revision C Page 12 of 29 fig 7 SB AMH Adjustable Mic Holder The angle of incidence of a mounted 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 e eo A a al SAM 100 95 UU 3 o o crm o lb o o o o o o 10 ee ae ANGLE INDICATOR alte lt q pig 02030 20 10 O 10 202040 041 e fig 8 SB AMH Adjustable
4. Mic Holder showin rotractor markings and sight hole Spacebar Modular System User Manual Revision C Page 13 of 29 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 numeric scales 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 TJ90 tube joiner also has sight 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 0 to 105cm from left to right and 105 to Ocm right to left e E421 indicated in centimeters and reads 40 0 40cm E407 indicated in centimeters and reads 25 0 25cm from the center 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 simpl
5. precision angle scale 5 degree markings from 90 to 90 degrees SB MH Standard Mic Holder cy SB AMHRA Adjustable Mic Holder Right Angle SB HB Hanging Bar Spacebar Modular System User Manual Revision C Page 5 of 29 SB TJ90 90 Degree Tube Joiner Allows any two 7 8 tubes to be joined at a 90 degree angle SB SMA Stand Mount Adapter 5 8 27 thread Comes with 3 8 16 European style thread adapter E407 53cm bar 7 8 diameter LASER etched scale reads 25 0 25cm 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 E418 Tube Joiner Joins any two 7 8 tubes Made from very strong 304 stainless steel Spacebar Modular System User Manual Revision C Page 6 of 29 E420 105cm bar E421 80cm bar E422 90 degree stand mount 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 Spacebar Modular System User Manual Revision C Page 7 of 29 Spacebar Configurations Detail Surround Tree The SB SUR system allows for mountin
6. C gt ER A lt lt E D E a G ai MUU Y A i SPAaACcErn aR Modular Microphone Positioning System User Manual Revision C August 2010 Spacebar Modular System User Manual Revision C Page 1 of 29 Table of Contents Standard pre configured arrays A A A A Sd A add 4 ca AA 4 SB D T Decca Tee A A IA 4 A RA A a O 4 SB MH Standard Mic Holder A ee ee cea 5 SB AMHRA Adj ustable Mic Holder Right ANgQle ocooccocccoconccoconoconccnccnonnnncnconaronnonconaronnonans 5 E420 TOS mM Da a a a e re ee c a tio isis daa T E42 OOCK Da o ess Y Decca lee sar a llo ated ld 9 A A O eee 9 SB SUR Surround Tree errar 23 SB DT Decca IEC cui is 24 Spacebar Modular System User Manual Revision C Page 2 of 29 Welcome and thanks for purchasing a Grace Design Spacebar microphone positioner We build all of our products to be completely reliable and easy to use so you can concentrate on making great recordings not struggling with complicated equipment or difficult product manuals While you will find the Spacebar is completely straightforward to use we do ask that you familiarizie yourself with this product manual to help avoid any common user difficulties 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 Sp
7. acebar 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 The Spacebar system is precision fabricated from machined aircraft aluminum brass and stainless steel If properly cared for it should last a lifetime In the event that you encounter any technical or operational difficulties with this or any Grace Design products please feel free to contact us at 303 443 7454 9 to 5 Monday through Friday MST Or you can email any questions to info gracedesign com Spacebar Modular System User Manual Revision C Page 3 of 29 Standard Pre configured Arrays SB SUR Surround Tree Holds 5 microphones SB DT Decca Tree Standard 3 microphone tree 2M x 1M a Gh SB BL Blumlein Holds standard large diaphragm microphones in a vertical Blumlein configuration SB BLRA Blumlein right angle Holds RCA 44 type ribbon microphones in a vertical Blumlein configuration dk SB 100 1 meter AB bar Straight 1 meter stereo bar Can be extended to 2 meters Spacebar Modular System User Manual Revision C Page 4 of 29 Spacebar Modular Components SB AMH Adjustable Mic Holder Mic holder with
8. ament line 016 DIA for 2 meter bar 140 7 H523 10 Barrel Swivel with safety hook 3 8 H522 S Hook closed 13 64 Dia 5 64 Wire Spacebar Modular System User Manual Revision C Page 28 of 29 Revision history Rev Description Date Initials A Initial release 10 07 09 MBG B Added SB HB parts diagram and bill of materials 12 07 09 MBG B Fixed SB BLRA bill of materials to show item number column 12 07 09 MBG Also fixed bom to show proper tube 80cm E421 B Corrected monofilament line yoke drawing to show proper 12 07 09 MBG swivel attachment B Changed references to mic cable clips to Velcro cable ties 05 06 10 EDG C Added coversheet 08 11 10 EDG Spacebar Modular System User Manual Revision C Page 29 of 29
9. ard 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 105cm q E i g p B E 210cm 4 fig 2 Decca Tree See the SB DT system exploded parts diagram for a list of included components 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 Spacebar Modular System User Manual Revision C Page 9 of 29 relative to the horizontal plane This can be very useful when micing and ensemble from above on a tall stand i 3 80c
10. crew 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 Revision C Page 16 of 29 fig 12 Bar end s hook installation fig 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 Revision C Page 17 of 29 Exploded Parts Diagrams SB AMH Adjustable Mic Holder Apply Locktite 242 ITEM NO Grace DESCRIPTION QTY Part 1 E417 Adjustable Mic Holder Top 1 2 H459 1 4 20 Flat Washer Bronze 1 3 H432 10 32 x 1 4 SK CP SS 1 4 H510 Knob Black 5 8 1 5 H514 5 8 27 Threaded Boss 1 6 H520 Round Pin 1 16 x 3 2 7 H446 10 32 x 3 4 Flat Socket Head Cap Screw 1 8 H447 10 32 x 3 16 Cup Point Set Screw 1 9 H512 Adjustable Handle 10 32 x 78 stud 1 10 H448 10 32 x 3 8 Socket Low Head Cap Screw 1 11 H515 5 8 27 24mm Nut 1 12 E412 Adjustable Mic Holder Tube Clamp 1 13 H445 10 Wave washer crescent 1 Apply Grease gt Spacebar Modular System User Manual Revision C Page 18 of 29 SB MH Standard Mic Holder Apply Locktite 242 ITEM NO Grace Part DESCRIPTION QTY E408 Mic Holder 7 8 Tube Clamp H514 5 8 27 Threaded Boss
11. g of 5 microphones In its standard configuration three microphones 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 front left and right microphone holder spacing can be adjusted from 6cm to 102cm if using the E420 105cm bar and 6cm to 50cm E407 53cm bar For surround microphone arrays using the SB SUR system we highly recommend visiting http www mmad info This website was created by Michael Williams who has written much about multichannel microphone array 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 AF an 105cm 53cm 8 8 _ E O o p SO e t SAO E M 105cm fig 1 Surround Tree See the SB SUR system exploded parts diagram for a list of included components Spacebar Modular System User Manual Revision C Page 8 of 29 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 stand
12. m 00 oD Y s fig 3 SB BLRA 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 Spacebar Modular System User Manual Revision C Page 10 of 29 gt a A fig 4 SB BL Blumlein with SB MH standard mic holders See the SB BL system exploded parts diagram for a list of included components AB Stereo The AB Stereo 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 las L las I l 105cm P fig 5 SB 100 See the SB 100 system exploded parts diagram for a list of included components Spacebar Modular System User Manual Revision C Page 11 of 29 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 The SB HB can be ordered in two versions 1 SB HB 1M with a guide line yoke sized for 1 meter wide bars 2 SB
13. ser Manual Revision C Page 22 of 29 SB SUR Surround Tree 2 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 Revision C Page 23 of 29 SB DT Decca Tree 1 8 10 A E E RY z l O gi 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 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 Revision C Page 24 of 29 SB BL Blumlein 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
14. y 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 E418 TUBE JOINER H402 8 32 x 1 4 FLAT HEAD SCREWS fig 9 E418 tube joiner bar assembly Spacebar Modular System User Manual Revision C Page 14 of 29 SB HB Hanging Bar The SB HB assembly threads into the SB SMA stand mount adapter as shown below fig 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 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 Revision C Page 15 of 29 10 a MIO SPACEBARENDS _ wee Se r we A N Sy YA j a Ny y J V Q fig 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 s
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