Main Menu, Navigation and Setup Cont...
Room EQ Setup
Overview
The Evolution 707 has a built in 1/3 octave digital parametric equalizer. The equalizer is
provided mostly to correct for errors in sonic presentation typically caused by speaker
placement or room variables. All of the Room EQ fi lters use a digital implementation of the
biquad fi lter algorithm. The biquad transfer function was digitized to implement the fi lters
using bilinear transform, with BLT frequency warping. This scheme maintains accurate
center frequencies and bandwidth. There are 24 of these fi lters that make up the Room EQ.
Each channel in the Evolution 707 has 3 of these fi lters, cascaded and labeled I, II or III.
Memory – There are (4) memory locations for advanced EQ fi lters. The options for Memory
are 1, 2, 3, 4 and Off.
Channel – An EQ fi lter can be saved and set for any individual channel. The channel options
are:
All - All of the channels are fi ltered in the same manner as specifi ed in the Room EQ
Setup Menu.
L, R, C, LS, RS, LB, RB or S – An Individual channel fi lter for a specifi c channel.
NOTE:
Make sure Channel is not set to “ALL” when exiting the Room EQ Menu, individual
channel options will be lost.
Filter Parameters - There are 4 parameters that can be set for each fi lter:
Type
HPF – High Pass Filter
Below is a graph of the HPF. The graph also shows what happens when you change
the FREQ parameter of the HPF fi lter. Notice how the -3 dB point changes frequency.
The FREQ parameter is the only parameter you can change on the HPF.
7.
A.
B.
C.
1.
2.
D.
1.
a.
