GRACE DESIGN SB-CMB

Product overview

The GRACE DESIGN SB-CMB is the stereo centre mount bridge for the Spacebar SB-30 and SB-66 kits: it adds a centre microphone that follows every z-axis adjustment made to the Spacebar.

The SB-CMB mounts to the horizontal bar so that the centre microphone follows any z-axis adjustment of the Spacebar; either the 30 cm or the 66 cm bar can be used. A 24 mm thumb nut clamps the mic holder bar, and loosening it lets the mic holder front to back position be adjusted from 3 cm to 13.5 cm on an engraved centimetre scale.

Key features

• Centre microphone mount for SB-30 and SB-66 kits
• Follows every z-axis adjustment of the Spacebar
• Front to back position 3 cm to 13.5 cm with engraved centimetre scale
• 24 mm thumb nut for quick adjustment
• Mounts with two 1/4-20 socket head cap screws; 3/16" hex wrench included
• Standard 5/8-27 or BSW 3/8-16 mic mount threads

Mounting

The bridge is fixed to the horizontal bar with two 1/4-20 x 1-3/4" socket head cap screws, tightened with the 3/16" hex wrench included in the kit.

In the box

• SB-CMB centre mount bridge with centre mount mic holder
• 2 x 1/4-20 x 1-3/4" socket head cap screws with washers
• 3/16" hex wrench

Available versions

• Standard 5/8-27 mic mount threads
• BSW 3/8-16 (British Standard Whitworth) mic mount threads

GRACE DESIGN SB-CMB: frequently asked questions

Which Spacebar kits does it fit?

The SB-30 and SB-66 stereo kits: either the 30 cm or the 66 cm bar can be used.

How far can the centre mic be moved?

From 3 cm to 13.5 cm front to back, set with the 24 mm thumb nut.

Is a tool needed?

Yes, a 3/16" hex wrench, which is included with the SB-CMB kit.

Where can I buy the GRACE DESIGN SB-CMB in India?

The GRACE DESIGN SB-CMB is available from Shivansh Electronics, Kolkata, West Bengal, India, with delivery across India.

Workflow 1: Three-microphone array on the Spacebar

Recordists adding a centre microphone to a stereo pair.

Connections

Setup

1. Fix the bridge to the bar with the two socket head cap screws.
2. Tighten with the 3/16" hex wrench.
3. Mount the centre microphone.
4. Set its front to back position (3-13.5 cm) and tighten the thumb nut.

Tip: The centre mic follows every z-axis adjustment of the Spacebar.

Workflow 2: Fine positioning of the centre mic

Engineers balancing the centre image.

Connections

Setup

1. Loosen the 24 mm thumb nut.
2. Slide the mic holder bar forward or back on its centimetre scale.
3. Listen and adjust.
4. Tighten the thumb nut and note the value.

Tip: The engraved scale makes the position repeatable.

Workflow 3: Choir or ensemble with a centre fill

Live and location recording.

Connections

Setup

1. Set the outer pair angle and spacing.
2. Add the centre mic.
3. Tilt the whole bar towards the ensemble.
4. Check all three channels.

Tip: Tilting the bar also tilts the centre microphone.

Workflow 4: Switching between bars

Owners of both 30 cm and 66 cm bars.

Connections

Setup

1. Remove the two cap screws.
2. Change the bar.
3. Refit the bridge.
4. Re-set the centre position.

Tip: Either the 30 cm or the 66 cm bar can be used.

Workflow 5: Repeatable session recall

Studios recording the same ensemble regularly.

Connections

Setup

1. Read the outer pair spacing and angles.
2. Read the centre mic position.
3. Log the values.
4. Restore them next session.

Tip: All positions are read from engraved scales.

Workflow 6: Thread version choice

Users with microphone clips of different threads.

Connections

Setup

1. Check the clip thread.
2. Choose the standard 5/8-27 or BSW 3/8-16 version.
3. Thread the clip on.
4. Lock it in place.

Tip: Both thread versions are available.