User Manual
Contents
1. 3 The 24mm thumb nut clamps the mic holder bar in place Loosening this nut allows the mic holder front to back position to be adjusted from 3cm to 13 5cm we D x amp ym 24mm THUMB NUT 1 4 20 x 1 3 4 SS SOCKET HEAD Cf CAP SCREW a Drawing 5 SB CMB Assembly Spacebar User Manual Revision B Page 6of 9 Exploded parts diagram Spacebar SB 30 1 30cm Microphone Bar 1 1 E406 66cm Mic Bar optional 1 2 E404 KEY ED RING 2 3 E403 Mic Holder Large 1 4 H432 10 32 x 1 4 SK CP SS 2 5 H510 Knob Black 5 8 2 6 E402 Mic Holder Small 1 7 E405 24mm Nut 10 32 Thread 2 8 E400 Round Stand Clamp 1 9 H407 8 32 x 3 8 Set Screw Pilot Point 1 10 H512 Adjustable Handle 10 32 x 78 stud 1 11 H520 Round Pin 1 16 x 3 2 12 H514 5 8 27 Threaded Boss 2 13 H436 10 32 x 7 8 FL SC SS 4 14 H459 10 Flat Washer Bronze 1 15 H515 5 8 27 24mm Nut 2 Spacebar User Manual Revision B Page 7of 9 Exploded parts diagram SB CMB ITEM NO Par DESCRIPTION QTY 1 E427 Center Mount Bridge 1 2 E426 Center Mount Mic Holder 1 3 H514 5 8 27 Threaded Boss 1 4 H515 5 8 27 24mm Nut 1 5 E405 24mm Nut 10 32 Thread 1 6 H494 1 4 X 1 Spacer 252 ID 1 2 OD Black Aluminum 2 7 H446 10 32 x 3 4 Flat Socket Head Cap Screw 2 8 H489 1 4 20 X 1 3 4 Socket Head Cap Screw St2. Lock Screw and remove the microphone holder body from the keyed ring Insert the desired microphone holder body into the keyed ring and tighten the Angle Lock Screw Place the microphone holder assembly into the slot on the horizontal bar and install the Position Lock Screw to secure the assembly Changing the horizontal bar length Refer to the exploded parts diagram at the end of this manual To remove the horizontal bar loosen the 8 32 set screw H407 with a 5 64 hex wrench Turn the set screw counter clock wise about 4 turns Twist the clamp handle counter clockwise to loosen its grip and slide the horizontal bar out of the stand clamp Insert the desired horizontal bar into the stand clamp and center it but do not tighten the clamp yet Tighten the set screw with the hex wrench until the screw stops then loosen the set screw by 1 4 Spacebar User Manual Revision B Page 5of 9 turn The horizontal bar should rotate freely but not slide out of the stand clamp Center mount bridge SB CMB optional 1 The SB CMB center mount brigde option allows for the mounting of a center microphone The SB CMB mounts to the horizontal bar such that the center mic will follow any z axis adjustments made to the Spacebar Either the 30cm or 66cm bar can be used 2 The SB CMB is mounted to the horizontal bar with two 1 4 20 x 1 3 4 socket head cap screws Use the 3 16 hex wrench included with the SB CMB kit to tighten these screws
3. Sa Ft CE D E S e SPACEBAR Precision Microphone Positioner User Manual Revision B December 2 2009 Table of Contents Changing the mic holder heightsosisn runaire niiair a iaa ii 5 Changing the horizontal bar lenat aniani ai a a a a aes 5 The Grace Design Spacebar microphone positioner allows for precise and repeatable setting of microphone capsule spacing angle of incidence and rotation around the x axis With precision scales for angle and distance engraved on the Spacebar components it becomes easy to make perfectly repeatable stereo microphone setups As well as being able to precisely set microphones in standard stereo configurations i e XY ORTF NOS and AB 50cm the Spacebar allows for exact settings through the entire continuum of angle and spacing This allows the user to adjust the stereo microphone array and tailor the pickup field to suit virtually any recording environment We highly recommend The Stereophonic Zoom by Michael Williams a technical paper that provides detailed information on the relationship between angle of incidence capsule spacing and the effective angle of the recorded sound field Itis a very useful reference that can greatly increase the flexibility of your stereo microphone techniques The Stereophonic Zoom can be downloaded from http www microphone data com pdfs Stereo 20z00m pdf The Spacebar system is precision fabricated from machined aircraft aluminum brass and st
4. ainless 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 product please feel free to contact us at 303 443 7454 Our office hours are from 9 to 5 Monday through Friday MST Or you can e mail any questions to info gracedesign com Spacebar User Manual Revision B Page 1of 9 Spacebar Components The Spacebar system consists of a center stand clamp horizontal bar and microphone holders Drawing 1 Spacebar Components Spacebar User Manual Revision B Page 2of 9 1 The horizontal bar comes in two sizes 30cm for the SB 30 and 66cm for the SB 66 The 30cm and 66cm horizontal barS are interchangeable in the field The maximum microphone holder spacing is as follows Model Minimum spacing Maximum spacing SB 30 7cm 2 75 26cm 10 2 SB 66 7cm 2 75 61cm 24 2 The stand clamp mounts on a standard 5 8 27 microphone stand thread Note the threaded section of the microphone stand should not be longer than 7 16 Threading the stand further than 7 16 into the stand clamp can cause the horizontal bar to bind and not rotate freely 3 The microphone holders are secured to the horizontal bar by the position lock nuts Loosening these nuts will allow the microphone holders to slide side to side for adjusting the microphone spacing The horizontal position can be adjusted wi
5. ainless Steel 2 9 H493 1 4 20 Flat Washer Stainless Steel 2 Spacebar User Manual Revision B Page 8of 9 Revision History Rev Description Date Initials A Initial release 01 30 09 MBG B Changed wording in Changing horizontal bar length 10 03 09 MBG Added SB CMB instructions Page Qof 9 Spacebar User Manual Revision B
6. stand clamp while rotating When released the handle will snap back and engage in the new position Setup Procedure 1 On the mic holder assemblies loosen the position locking nut and the angle locking screw and set the angle to 0 Tighten both again Thread on the microphone clips for your desired microphones but do not tighten all the way Put the microphones in the clips and while looking down on the Spacebar from above point the mics so that they are pointing straight forward and are perpendicular to the horizontal bar While holding the microphone in this position turn the jam nut counter clockwise until the clip is securely locked Spacebar User Manual Revision B Page 4of 9 gt Tc gt Drawing 4 Microphone alignment top view Unlock the position locking nut and the angle lock screw and rotate the clip to the desired angle of incidence Re lock the angle lock screw Mount the microphones and using a tape measure or ruler adjust the spacing between capsules Lock the position locking nuts Changing the mic holder height 1 To change between the standard height mic holder and the tall mic holder loosen and remove the Position Lock Nut while while holding the microphone holder assembly so that it does not fall Loosen the Angle
7. th 5mm precision by using the ruler on the front of the horizontal bar Note that these rulers are for reference as the actual capsule spacing will need to be determined with a measuring tape or ruler The SB 30 and SB 66 are both supplied with two microphone holder assemblies and an additional tall microphone holder The taller microphone holder body can be used to raise one microphone to avoid interference if the mic spacing requires that the microphone bodies overlap See Changing the mic holder height later in this manual Additional microphone holders can be purchased if more than two microphones are to be mounted to the Spacebar Drawing 2 SB 66 with multiple mic holders 4 When the position lock nuts are loose the microphone angle can be adjusted by loosening the angle adjust locking screws The angle of incidence can be adjusted with 5 precision by using the angle scale on the front of the microphone holder Spacebar User Manual Revision B Page 3of 9 Drawing 3 Adjusting the position of the clamp handle 5 The vertical angle of the microphones can be adjusted by loosening the clamp handle and then rotating the horizontal bar to the desired angle For reference there is a 90 scale on the side of the stand clamp The stand clamp locking handle is adjustable and is set from the factory to provide a good clamping force with the handle pointing downward To adjust the angle of the handle pull the handle back from the
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