Room Eq Setup; Overview; Memory; Channel - Krell Industries EVOLUTION 707 Owner's Reference Manual

Reference surround sound preamp / processor

Hide thumbs Also See for EVOLUTION 707:

Table of Contents

Main Menu, Navigation and Setup Cont...

Room EQ Setup

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:

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.

Table of Contents