Qsc-audio CX168 User Manual download pdf (Page 10)

SETUP: MODE SWITCHES: CLIP LIMITER AND LOW FREQUENCY FILTERS

The CX168 amplifier has separate clip limiters for each of

the 8 channels. These clip limiters respond only to actual

amplifier clipping. Amplifier clipping generates internal error

signals which cause the clip limiter to quickly reduce gain

and minimize the overdrive. To preserve as much of the

program dynamics as possible, limiting occurs only during

actual clipping. Each channel’s clip limiter can be switched

on or off individually.

CAUTION! Clip limiting reduces extreme

overdrive peaks, allowing a higher average

signal level without distortion. Increasing the

gain with the clip limiter engaged until

clipping is again audible, can double the

average output power. Be careful not to

exceed the power rating of the speakers!

Clip Limiter

The clip limiter is internally set to respond as fast as

possible after clipping is detected. For program material that

is primarily “full-range”, the effect on the overall audio

quality should be imperceptible. We recommend using the

clip limiters for almost all applications, especially full-range

audio applications. Clipping can cause high-frequency

artifacts to be output to the speakers, potentially damaging

fragile high-frequency drivers.

For program material that is primarily low-frequency in

nature (low-frequency or subwoofer drive) this may be

perceived as a “rubbery” effect on the audio. If this is the

case, it may be preferable to turn the clip limiters off and let

the amplifier clip occasionally. With robust, low-frequency

drivers, the occasional clipping should cause no problems.

Low Frequency Filter

When driving speakers with limited low frequency

response, it is important to limit the low frequency

response of the amplifier. Doing so can result in more

usable bass response since the speaker is not being

overloaded by very low frequencies it can’t handle.

Explanation-

Low frequency sound waves require much

more speaker cone motion to produce the same apparent

loudness as higher frequencies. Properly designed speaker

enclosures help the speaker to move more air with less

motion using techniques like porting. Such enclosures only

benefit from porting down to a certain frequency. Below

this frequency, the speaker is “unloaded” and is basically

free to move around uncontrollably without producing much

bass. Limiting the frequency range of the low frequency

content enables the speaker to behave the way it was

designed to. If frequencies lower than designed are

supplied to the speaker, performance will degrade.

All low frequency filters will change the character of low

frequency transients. For best results, the cabinet design,

speaker capabilities, and program material must be taken

into account when configuring low frequency filtering.

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Qsc-audio CX168 User Manual Page 10

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