13
EQ MODES – Automatic Room Mode Correction (ARMC)
The amplifier comes from the factory set to BYPASS. This setting produces a flat frequency
response at the subwoofer module. In some cases your room response may benefit from
ARMC.
Eigen-modes, also known as room modes, exist in all rooms. These room modes are
an interaction between the listening room itself, the location of the subwoofer, and the low
frequency wavelengths being on the same order as the room dimensions. This interaction
causes peak and null energy areas in your listening room which differ depending on the room
and the subwoofer location.
The ARMC program was designed to send a series of tones thru the RCC300 and then
analyze the system response at the microphone position. The program then reduces the level
of the frequency bands that have energy peaks caused by the room modes. As a by product,
after the ARMC process has been completed the overall subwoofer amplifier gain may need
to be raised to achieve the previous volume levels.
If your normal listening position is located in a null, then the only way to truly even out the null
is by either moving the subwoofer location to change the room modes that are stimulated
OR
install a distributed bass system. Distributed bass uses multiple subwoofers in different
locations in order to stimulate more of the room modes. It has been shown that this type of
system mitigates Eigen-modes and provides a more uniform response to a wider listening
area. Each RCC300-SA has the capability for running two RCC300-SM, or two RCC300-FS.
1. AUTO EQ MIC –
This is the input jack for the ARMC Microphone.
2. Switch Settings –
Select either:
a.
BYPASS –
ARMC not active.
b.
AUTO EQ.
– ARMC active. Will remember the last measured room mode sequence
and settings.
3. BLUE LED STATUS INDICATOR
a.
Continuous Short Flash –
Switch in AUTO EQ setting, ARMC not yet saved. Since
the a
mplifier leaves the factory with this function having been tested the LED should
not flash continuously even when the switch is set to the AUTO EQ position.
NOTE: It is important that you do a room mode set up using the supplied
