First Time Power Up And Use - Infinity IRS Epsilon Owner's Manual

Epsilon
First-Time Power-up and Use
It is also basic to system operation that the gains of the two amplifiers (woofer and mid/high) that drive an Epsilon's two
sections be the same, or be adjustable to be the same, within 6dB if possible.
The SCU's front panel bass level control enables you to adjust the level of the low frequency section to achieve
satisfactory tonal balance between the two sections.
If your amplifiers for the two sections do not have gains that match within 6 db, or are not adjustable to this degree of
gain matching, consult your dealer for assistance. You may need different amplifiers or an external level control. This
will allow more "bass level" adjust range.
Setting the SCU rear-panel phase switch
The signal phase of the SCU's electronic woofer servo control circuitry must match that of the woofer amplifier. The
SCU's phase switch provides this matching. If the woofer amps are non-inverting, set the phase switch to the 0
position. If the woofer amps are inverting, set the phase switch to the 180 position.
WARNING: The SCU's phase switch must be correctly set for the amplifier in use. Incorrect setting of this
switch can lead immediately to woofer and/or amplifier failure.
If you are unsure of the amplifier's phase, by all means, check it or have it checked. If you are using balanced XLR
inputs on the amplifier, it is imperative that you check its conformance to AES standard wiring of the connector.
Setting the SCU rear-panel dB gain control
The gain of the SCU's woofer servo control circuitry must match that of the woofer amplifiers. The SCU's dB gain
control provides this gain matching for amplifier gains ranging from 21dB to 39dB. If your woofer amps' gains fall
outside of this range, and cannot be adjusted to be within this range, please see you dealer for assistance. You may
need different amplifiers or an external level control.
The top-center 0 setting matches a woofer amplifier gain of 27dB. If your woofer amplifier gain is lower than 27dB,
increase the dB gain control setting (clockwise) by the difference between your woofer amps' dB gains and 27dB.
Similarly, if woofer amp gain is higher than 27dB, decrease the dB gain control setting (counter clockwise) by the
difference between your woofer amps' dB gains and 27dB.
Setting the SCU front-panel controls
Initially, set the front-panel bass contour, mid-bass contour, and bass level controls to their top-center, 0dB positions.
We will discuss the use of these controls in the following sections.
You are now ready to turn the system on and listen to music.
FIRST-TIME POWER-UP AND USE
Check everything!
Before turning on the power to your system, confirm that all cable connections are fully and securely made, and that all
switches and controls are in their recommended initial positions. Be sure that the preamp volume control is all the way
down.
SCU power control
The Epsilon SCU power switch has two positions - standby and on. In the standby position, the outputs of the SCU
are muted but the SCU's amplifier circuitry stays powered up. The on LED flashes when the SCU is in standby mode.
Since the power consumption of the SCU is quite small, there is no reason for complete shutdown. Keeping the
circuitry "hot" assures stable operation and best sound quality. When you turn the power switch to on, the on LED will
light steadily. About 10 seconds after this, the servo LED will light, indicating that the system is unmuted and is ready
for operation.
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