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Questions and Answers 4
®
Questions And Answers
©2004 PS Audio International Inc. All rights reserved.
Owner’s Reference
A-100 Power Amplifi er
The A-100 Power Amplifi er is best left powered on at all times. The current draw is negligible and
keeping it powered on will make sure the internal AC capacitors stay working properly.
There is no harm in leaving the unit on at all times as the lifespan of the A-100 Power Amplifi er will be
unaffected by leaving it on.
There are no user replaceable internal fuses inside the A-100 Power Amplifi er. There is an internal fuse
that should only be replaced by an authorized service center if needed. The components inside the
A-100 Power Amplifi er have lethal voltages when powered and even when un-powered. Capacitors
inside the A-100 Power Amplifi er can retain an electrical charge after the unit has been powered
down. Do not attempt to get inside the unit for any reason unless instructed to do so by your dealer
or an authorized service representative. Should the A-100 Power Amplifi er cease to function, contact
your dealer or PS Audio’s service center for help.
Placement of the A-100 Power Amplifi er is not critical. Placement with respect to other equipment
can be important. In general, place the A-100 Power Amplifi er close to the preamplifi er or surround
processor as possible. It is always preferable to have long speaker cables and short interconnects
if there is a distance problem. Long interconnect cables will degrade the performance of most
preamplifi ers, surround processors or integrated amplifi ers and receiver preamp outputs.
Isolation through the use of spikes, cones or Sorbothane feet is recommended for the A-100 Power
Amplifi er if space and budget allows. Isolation of any piece of high-end stereo and theater equipment
is always recommended wherever practical.
Yes, cables make a difference. It is important to use the best power cables, interconnects and
speaker cables when operating the A-100 Power Amplifi er.
There is only one power switch for the A-100 and it is located on the rear of the chassis.
To bi-amp with the Trio, you need only one interconnect (either XLR or RCA) to feed both channels of
the Trio. Using the rear mounted switch, choose “mono” and use the left input. This will feed both the
left and right channels with the same signal.
Benefi ts of bi-amping. Bi-amping is possible in two confi gurations, horizontal or vertical. Horizontal
describes using one stereo amplifi er to power both woofer/midrange sections of a speaker and using
the second stereo amplifi er to power both left and right loudspeaker tweeters. Vertical bi-amping
describes the preferred method of bi-amping. This is where one stereo power amplifi er powers a
single loudspeaker (either left or right). One channel of the stereo amplifi er feeds the tweeter of the
loudspeaker and the other channel feeds the woofer midrange.
You can power nearly every loudspeaker made with a A-100 Power Amplifi er. It is relatively tolerant
of most loudspeakers loads and will not be damaged by attempting to power heavy loads. If, while
playing music, the A-100 Power Amplifi er continues to go into a protection mode when the music gets
loud, it means that the speaker load is probably too diffi cult for the A-100 Power Amplifi er and the next
Should the unit
be on all the
time?
Are there any
internal fuses?
Placement?
Isolation?
Power switch
Do cables make a
difference?
What speakers
can I use?
Bi-amping
