Controls and Connections 7
Controls and ConneCtIons
35Hz Level Knob
The 35Hz Level knob significantly adjusts the level
between 30 and 50Hz by ±10dB. This is an area where
peaks and dips of different amplitudes often manifest in
real environments. This setting is dependent on room size
and construction, system configuration and personal pref-
erence.
Light Switch
The light control switch allows the brightness of the illu-
minated MartinLogan logo to be dimmed or turned off.
ESL Signal Input
These binding posts provides a place to connect the signal
that drives the XStat™ ESL transducer.
Woofer Signal Input
These binding posts provides a place to connect the signal
that drives the PoweredForce™ woofer.
Status Light
The Spire is equipped with a multi-color LED to indicate
the current status of the PoweredForce™ woofer. The fol-
lowing list explains the meaning of the different colors:
No color: No power. The Spire is not plugged in.
Blue: Play mode. This indicates the Spire detects an audio
signal and has automatically switched into play mode.
Red: Standby mode. This indicates the Spire has detect-
ed no audio signal for approximately 15 minutes and has
automatically switched into standby mode.
Flashing Red: Initializing or Safe mode. This indicates that
the Spire is initializing. This also indicates if the Spire’s
temperature has exceeded nominal operating range. If the
Spire overheats, please allow the Spire to cool and reset
it by unplugging the unit and plugging it back in.
AC Power Connection
Because your MartinLogan Spire speakers use an inter-
nal power supply to energize their electrostatic cells and
PoweredForce™ woofer, they must be connected to an
AC power source.
Figure 1. Spire Controls and Connections
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