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These acronyms appear in discussions on the Bose® Pro Portable PA Community. Most have a wide application in the live music environment, and some are peculiar to the discussions among L1® owners.


A DI unit or DI box is an electronic device designed for connecting a piece of equipment with an electronic audio output to a standard microphone or line level input. For more details see: DI


Disk Jockey, but may also include KJ (Karaoke Jockey), VJ (Video Jockey). There is a dedicated application page for DJs.


Front of House System (blue) and FOH Engineer in the Audience
Front of House

This is the area of a venue that is open to the audience in contrast to the areas that are not such as the stage and backstage areas. This may also refer to the House System. That is: the sound system provided by the venue to serve the audience. This is in contrast to the any monitoring system on the stage for the performers.

FOH may also mean the Front of House Engineer. This is the person that controls the mix for the audience. Sometimes FOH means the position in the house where the FOH Engineer operates his/equipment.

More: Front of House Engineer — Wikipedia


Gear Acquisition Syndrome - see Avoiding GAS


Guitar Player Syndrome


The term most often used in measuring the magnitude of sound. It is a relative quantity in that it is the ratio between the actual SOUND PRESSURE and a fixed reference pressure. This reference pressure is usually that of the THRESHOLD OF HEARING which has been internationally agreed upon as having the value .0002 dynes/cm2.

SPL may be measured with a SOUND LEVEL METER weighted according to a specific frequency response pattern and termed SOUND LEVEL. The electroacoustic equivalent to SPL is measured with a VU METER.


Change in Sound Pressure Level dBApproximate change in acoustic pressurepercentage change in acoustic pressureHuman Subjective Reaction
1dB1.110%Can′t detect
3dB1.440%Minimum change we can remember
6dB2.0100%Pressure doubling, significant change
10dB3.3330%Subjective doubling
20dB10.01000%Very noticeable change

— Source:


{{#Click:TRS|Image:Jack plug.png|200px|Article about TRS and TS}}
¼ inch jack with Tip-Ring-Sleeve connections. See #2 in picture and click picture for details.

See TRS and Balanced vs Unbalanced


{{#Click:TRS|Image:Jack plug.png|200px|Article about TRS and TS}}
¼ inch jack with Tip-Sleeve connections. See #1 in picture and click picture for details.

See related:TRS and Balanced vs Unbalanced