27
Evolution DC Protection Circuitry/Using Tube Preamplifiers
The high DC output of tube preamplifiers may exceed the active DC protection circuitry of
the Evolution e Series amplifiers. Excessive DC level in a signal can damage amplifiers,
loudspeakers, or both. The single-ended inputs of the Evolution e Series amplifiers are
capacitor-coupled and DC does not pass through. Therefore, if connecting a tube
preamplifier, use the single-ended inputs only. For more information about DC protection
circuitry features,
see Error Codes on page 31.
Connection Steps
See Figure 8 on Page 28
Position the amplifier where you intend to use it in your system.
The following steps describe how to connect an Evolution e Series amplifier to
your system:
1.
Turn off all power sources and components before connecting inputs and outputs.
2.
Neatly arrange and organize wiring to and from the Evolution e Series amplifier and all
components. Separate AC wires from audio cables to prevent hum or other unwanted
noise from being introduced into the system.
3.
Connect the outputs of your preamplifier to the appropriate CAST (4), balanced (6), or
single-ended inputs (5) on the Evolution e Series amplifier.
Note
Connect the u-shaped jumpers between pins 1 and 3 of the XLR connectors when using single-
ended inputs. On 2250e and 3250e toggle the Input Select Switch to single-ended.
4.
Connect the loudspeaker cables to the loudspeaker binding posts (7) on the Evolution e
Series amplifier. The binding posts accept spade lugs only. Take care to observe the
correct polarity when making connections: The positive (+) output connects to the
positive input of the loudspeaker. The negative (-) output connects to the negative input
of the loudspeaker.
5.
Connect the supplied AC power cord to the AC power cord receptacle (9).
6.
Plug the AC power cord into AC power.
Note
Use only the power cord provided with the Evolution e Series amplifier to make the connection to
AC power. Operation with a power cord other than the one supplied by Krell could induce noise,
limit current, or otherwise impair the ability of the amplifier to perform optimally.
(SECTION FOUR: Connecting an Evolution e Series Amplifier to Your System continued)
