Manualshelf

Installation manual

ManualsBrandsZed Audio Manualsaudio & home theatreRa
61626364656667686970
The ATTACK time determines how quickly the compressor can react to signals which are
above the threshold. The RELEASE time determines how quickly the compressor
releases the signal and return to normal gain. The RATIO control sets the ratio of input
level to output level and typically compressors have ratio controls with ranges from 2:1 up
to 12:1 dependent on the type of signal being compressed. RA also uses RMS sensing of
the signal to control the compressor. Peak sensing is typically used in limiters (A limiter is
just a compressor with a higher ratio setting and different attack and release times.
RA uses a hard “knee” at the compression threshold point meaning that compression
instantly takes place and this form is best for low frequencies and percussive instruments
such as drums.
Another use for this compressor is to prevent amplifier clipping from damaging the
woofers and also to protect the amplifier. Setting the volume level to the loudest that you
want, set the THRESHOLD control on RA so that the compressor LED flashes regularly.
The last control is the VOLUME control and this of course sets the level of the sub
woofers. It also controls the “make up gain” required by the compressor so that even
though the compressor is set to compress, the gain can still be increased but in a
compressed mode. Remember that the final signal level reaching the speakers is also
controlled by the level setting on the amplifier and that is why we include CLIPPING LEDs
on all our amplifiers.
RA can be mounted in two ways, first by having a cut out in a panel which is slightly
larger than the X-Y dimension of the chassis and the front panel is then bolted to the
mounting surface. The second is to use the two mounting brackets and hang RA from a
horizontal surface - or it may be mounted in a glove box with the mounting brackets
forming a stand.
Please take care when playing your system at high volume levels as hearing loss is
NON REVERSIBLE.
2:1
10:1
INPUT SIGNAL
OUTPUT
SIGNAL
UNITY GAIN
THRESHOLD OF COMPRESSION
>20:1 = LIMITING
Page 64