Krell Full Power Balanced X Series Power Amplifiers
21
Questions and Answers
Q.
Should I leave my Full Power Balanced amplifier on at all times?
A.
For maximum amplifier performance, leave the back panel power
breaker switch on at all times. This places the amplifier in stand-
by mode. Full Power Balanced amplifiers are designed to be
powered on and off from stand-by, using the front panel power
button. This eliminates “cold start” degradations. The amplifier will
operate at full performance within minutes.
Q.
When I turn on the amplifier there is a loud hum through the loud-
speakers. What should I do?
A.
When a new component is introduced, a low frequency hum may
occur in one or both loudspeakers. Check all input and output
connections and cables, making sure they are of sound construc-
tion. See
How to Troubleshoot System Noise,
on page 19. If
the interconnects and cables are sound, you may be experienc-
ing a ground loop. This can often be easily eliminated. Please
contact your authorized Krell dealer, distributor, or Krell for sug-
gestions on how to solve this problem.
Q.
My system includes multiple pairs of loudspeakers. Can I connect
them to my Full Power Balanced amplifiers through a loudspeak-
er selector box?
A.
No. Most loudspeaker selector boxes use a common ground
scheme. The differential circuitry in Full Power Balanced ampli-
fiers prohibits the use of these devices.
Do not connect a Full
Power Balanced amplifier to a loudspeaker selector device
that employs a common ground scheme, as it may shortcir-
cuit the amplifier output.
Q.
My loudspeakers have only one pair of binding posts, but my Full
Power Balanced stereo amplifier has two pairs. Which pair of
loudspeaker binding posts should I use, the upper or the lower?
A.
The upper and lower pair of loudspeaker binding posts on Full
Power Balanced stereo amplifiers are identical. You can use
either the upper or lower pair; they work and sound the same.
See
Connecting the Full Power Balanced Amplifier to Your
System,
on page 13.
Q.
My loudspeakers are rated for 150 Watts. Are the Full Power
Balanced 400cx or 700cx models too powerful for them?
A.
No. A loudspeaker seldom is damaged from overdriving. More
often, damage occurs when an amplifier that lacks sufficient
power is asked to handle heavy demand situations such as high
playback levels. These amplifiers may have very high 8 Ohm
