Krell Industries KAV 3250 - Manual (Page 27)

2 Krell KAV–2250 and KAV–3250
Definition of Terms
Following are the definitions of key terms used in your owner’s reference manual.
CONFIGURATIONS
Bridging
A method of linking two amplifier channels by distributing the speaker load between the
positive binding posts. Bridging the channels quadruples the power rating at 8 Ohms.
Bridged configurations should not be used with loads under 4 Ohms.
Krell Multi Amp Throughput (MAT)
An internal configuration option that sends the same music signal to all amplifier
channels using one balanced or single-ended connection. MAT reduces installation
complexity and cabling requirements in systems containing multiple amplifiers. MAT
also allows a variety of connection scenarios, including powering loudspeakers that
have two sets of binding posts and independently powering multiple pairs of stereo
loudspeakers to extend the listening environment throughout your home.
INPUT AND OUTPUT CONNECTIONS
Balanced
A symmetrical input or output circuit that has equal impedance from both input terminals
to a common ground reference point. The industry standard for professional and sound
recording installations, balanced connections have 6 dB more gain than single-ended
connections and allow the use of long interconnect cables. Balanced connections are
completely immune to induced noise from the system or the environment.
Single-ended
A two-wire input or output circuit
.
Use care when using single-ended connections as the
ground connection is made last and broken first. Turn the system off prior to making or
breaking single-ended connections. Single-ended connections are not recommended for
connections requiring long cable runs.
Krell KAV–2250 and KAV–3250 23
Questions and Answers
Q. Should I turn the amplifier off when not playing music?
A. No. Leave the amplifier in stand-by when not playing music. The stand-by mode
avoids cold starts as well as minimizes heat output and power consumption. Krell
recommends turning the amplifier off if you plan to be away for a period of time, for
example, on vacation. See
Amplifier Operation, on page 13.
Q. When I turn the amplifier on there is a loud hum through the loudspeakers. What
should I do?
A. When a new component is introduced, a low frequency hum may occur in one or
both loudspeakers. Check that all input and output connections and cables are of sound
construction. See
Troubleshooting System Noise, on page 14. If the connections and
cables are sound, you may be experiencing a ground loop. This can often be easily
eliminated. Please contact your authorized Krell dealer, distributor, or Krell for
suggestions.
Q. When I connect the amplifier to my system using the single-ended inputs, a loud
buzz comes from my loudspeakers. What is it?
A. Check that the shorting pins for the amplifier are inserted into the XLR inputs (the unit
is shipped with the pins in place). When using the single-ended inputs, the shorting pins
must be inserted between pins 1 and 3 to keep external noise from corrupting the
signal. For more information, see
Connecting the Amplifier to Your System, on page
11.
Q. Can I bridge all the channels on my KAV–3250 amplifier?
A. No. You can bridge two of the amplifier’s channels: 1 and 2. Channel 3 cannot be
bridged.
Q. Will I be able to use the amplifier without reconfiguring the channels for MAT or
bridged operation?
A. Yes. The amplifier is shipped from the factory ready to play music. The default
settings, see
Figure 5, on page 16, allow you to connect each amplifier channel output
to a separate loudspeaker. MAT and bridging reconfigurations are optional.