3
protective action exists for a wide range of problematic conditions. Collectively,
the protection circuitry is designed to avoid damage caused by other defective
components, faulty wiring, mishandling of the system or amplifier failure.
Krell is committed to balanced operation in all products. Balanced systems have
long been standard in professional audio applications and the same advantages
apply to home audio equipment. There is a 6dB increase in gain without an
increase in noise and there is a decrease in overall system noise caused by stray
AC and RF fields. Sonic performance is drastically improved, particularly in
dynamic and soundstage presentation.
B. POWER CONSIDERATIONS
The KSA-150 is rated as delivering 150 watts per channel into 8 ohms. The
amount of Class A power is adjusted for the finest sonic performance with a
minimum of generated heat and energy consumption. The amplifier’s maximum
power into 8 ohms is 220 watts per channel. The KSA-250 is rated as delivering
250 watts per channel into 8 ohms. The amplifier’s maximum power into 8 ohms
is 320 watts per channel.
That every Krell product uses Class A circuitry in all gain and supply stages is a
foundation of our design philosophy. A second design commitment that relates to
amplifiers is that every unit be capable of doubling its output into successively
lower impedances. The KSA-150 will deliver 300 watts per channel into 4 ohms,
600 watts per channel into 2 ohms and 1,200 watts per channel into 1 ohm. The
KSA-150 is fully capable of driving impedances below 1 ohm. The KSA-250 will
deliver 500 watts per channel into 4 ohms, 1,000 watts per channel into 2 ohms
and 2,000 watts per channel into 1 ohm. The KSA-250 is capable of driving
impedances below 1 ohm.
Given the above, the AC power supplied to the amplifier is crucial to getting
maximum performance. The KSA-150 will operate at its peak with a dedicated
20- amp line, although this is not a requirement. Additionally, the KSA-150 should
only be operated with the power cord supplied with the unit. Use of other power
cords may damage the amplifier and void its warranty. The KSA-250 requires a
dedicated 20-amp line. It too, should only be operated with the power cord
supplied with the unit.
Please consult Krell or your dealer before using any devices designed to alter or
stabilize the AC power for the KSA-150 or KSA-250.
C. UNPACKING
Remove the unit, power cord and accessories from the shipping container. Store
all packing materials in a cool, dry place for future use. Inspect the unit for
shipping damage. If any damage is evident, contact your dealer immediately. If
the unit is in proper condition, proceed with the installation.
