Troubleshooting

2006-11-16T23:32:39Z

Billshoup: /* Odd Stage Position */

There are several different forms of "trouble". At least initially, let's break them down into Acoustics, Gear, Venue.
== Acoustics ==
=== Feedback ===
[[Feedback/Microphone|Feedback]] happens when the sound from the loudspeaker enters the microphone or instrument with pickup only to be re-amplified. With the {{L1}} it is typically easier to manage unwanted feedback because you typically have fewer loudspeakers, and fewer microphones to manage per System. ... [[Feedback/Microphone|full article]]

=== Hearing Yourself ===
[[Hearing Yourself with the L1™|Hearing Yourself]] can be a challenge, especially if you are not the only performer playing through the {{L1}} you are using. But even if you have you own {{L1}} there can be challenges on stage. If this is your issue see: [[Hearing Yourself with the L1™|Hearing Yourself]]

=== Bass Regeneration ===
[[Bass Regeneration]] is a special class of feedback, or regeneration, that exists in all live amplification systems. It is a very insidious and hard-to-confront phenomenon, but it is responsible for a lot of bad sound. Resonances of all kind, including those of musical instruments and those of large “boomy” rooms will also contribute to bass regeneration. ... [[Bass Regeneration|full article]]

== Gear ==
=== Drop Outs ===
Intermittent sound can result from:
* poor connection to the {{B1}}. Check the wires in the Speakon connectors.
* poor connection to the {{R1}}. Reseat the connections at both ends

=== Hiss ===
If you have all settings on the {{PS1}} set straight-up (including the {{R1}}), with nothing connected, you may hear an audible hiss within 4-8 feet.

The reason: At these settings the System is running wide-open at full power with no input signal. If you use a microphone or a recorded source playing with these settings - the System would be ''extremely'' loud. When you provide an input signal source with appropriate trim settings the hiss should be inaudible.

Solution:
Use the {{R1}} to lower the Master Level when you have no input signal source.

Note: It is recommended that you [[R1 Remote Recommended|use the R1 Remote]].

==== Related Discussions ====
* [http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/9691096282/r/3781027282 hiss with no inputs]
* [http://bose.infopop.cc/groupee/forums/a/tpc/f/3976055944/m/7301030982/r/6931053982 white noise issues]

=== Hum ===

You want to isolate the source of the hum, but this can be tricky because hum is usually the result of two or more devices interacting.

Start with the {{L1}} fully assembled, no inputs, all settings on the {{R1}} straight up. If there is no hum then turn down the Master Level.
* Connect a sound source (simplest possible signal chain - for example microphone only).
** Turn up the Master Level

Keep adding items to the signal chain until you hear the hum. When you get the hum, remove the source and make sure that the hum goes away. When you are sure you know what is causing the hum, check that the source of the hum is connected to the same power source as the {{PS1}}

* Try a [[DI]] with a groundlift between the device that causes the hum and the {{PS1}}

=== Cell Phone ===
Do not leave your cell phone on or near the {{PS1}}. If there is an incoming call, the ring ''may'' be amplified through the loudspeaker.

=== Computer ===
See: [[Computer/Sounds]] if you have a computer in your signal chain.

== Venue ==

=== Small Stage ===
When offered a chance to play, one of my first questions is about the size and position of the stage. If you find that your show is going to be compromised by a small or awkwardly positioned stage, just
* Ask for more space
* To set-up in a better position in the room
* Don't hesitate to remove false walls, decorative railings, hanging obstructions, anything that can be handled with a screwdriver, or is otherwise easily restored.
{{:Stage Size}}

=== Odd Stage Position ===
If placed in a corner, ask if you can be placed in the center or a wall. If the "short" wall in a rectangular room is wide enough, then that is probably your best choice for the wall behind you (if the long wall is not greater than 100 feet).

[[category:Troubleshooting]]

Bose Portable PA Knowledge - User contributions [en]

Troubleshooting