Crown GLM-200 Specifications download pdf (Page 23)

FISHMAN POCKET BLENDER

APPENDIX III: SMART SWITCH

If your instrument has an active

pickup/preamp and you are going to route

electret microphone and pickup signals

through a single stereo cable, you may

need to install a SMART SWITCH for the

system to operate.

WHAT IS A SMART SWITCH?

The SMART SWITCH is a voltage sensing

electronic switch. A SMART SWITCH must

be installed with certain pickup/preamp/mi-

crophone configurations due to the physi-

cal limitations of the stereo (TRS) jack

used on the instrument.

WHY DO I NEED A SMART SWITCH?

Most instrument mounted preamps have no on-off switch. In-

stead, they rely on a "switching" stereo jack that turns the pre-

amp on when a 1/4" plug is inserted. The actual switching is

performed by the plug: it shorts the negative battery wire (RING

connection) to ground. Similar in function to the input jack on a

"stomp box" pedal, the switching jack can extend battery life

since the preamp is turned off with the plug removed. The stan-

dard wiring configuration is as follows:

TIP = Pickup Signal

RING = Negative Battery Wire

SLEEVE = Ground

Adding the Fishman/Crown GLM-200 microphone to a switching

jack configuration creates an electronic version of musical

chairs in which the microphone signal and negative battery wire

are both vying for the same RING terminal on the stereo jack.

Attempting to connect both the Microphone and Battery wire to

the RING terminal will ground out the microphone.

WHAT DOES THE SMART SWITCH DO?

The Smart Switch takes over the preamp power switching duty

and frees up the RING terminal on the output jack for the micro-

phone signal. The Smart Switch takes its cue by electronically

sensing phantom power, sent from the Blender and in turn

switching on the preamp.

In cases where the microphone is not needed, the Smart Switch

will know to turn on the preamp with a mono phone plug insert-

ed. Pretty smart, eh?

WHO NEEDS A SMART SWITCH?

The following Fishman pickup/preamp systems will require a

SMART SWITCH to be installed in conjunction with the Fish-

man/Crown GLM- 200 Microphone:

AGP-2 and ABGP

Onboard Guitar Preamps

Acoustic MATRIX

Professional System

Acoustic MATRIX Natural

Acoustic MATRIX Hot

Other manufacturers' preamps may also require a SMART

SWITCH. Contact the Fishman's PRODUCT INFORMATION

LINE at 978-988-9665 for assistance.

NOTE: The SMART SWITCH is NOT required when using a

Fishman POWERJACK endpin preamp in conjunction with the

Fishman/Crown GLM 200 microphone.

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Crown GLM-200 Specifications Page 23

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