Srev1 Basics - Yamaha S Rev1 Owner's Manual

6
Chapter 1—Welcome

SREV1 Basics

Reverb Modes
The SREV1 offers three Reverb modes: 2-channel, 4-channel, and 2-channel x2. In
2-channel mode, the SREV1 functions as a stereo reverb processor. Use this mode if all
you require is stereo outputs, as it offers the maximum convolution time per channel.
In 4-channel mode, the SREV1 offers 4-channel processing for surround reverb. In
2-channel x2 mode, the SREV1 functions as two independent stereo reverb processors
(A and B).
See page 34 for information on selecting Reverb modes.
The onboard AES/EBU inputs and mini YGDAI slot inputs can be freely assigned to
channels. See "Assigning Inputs" on page 35 for more information.
Convolution Times
The following table shows the maximum convolution time available per channel for
each mode with and without the optional DB-SREV1 DSP Expansion Board installed.
2-channel
4-channel
2-channel x2
Convolution time is not the same as reverb time. Reverb time is the time it takes the
reverb to decay to –60 dB, and more convolution is required to provide reverberation
to –90 dB or –120 dB, so the convolution time must be between 1.5 and 2 times more
than the reverb time.
Impulse-Response Data
Impulse-response data contains the impulse-response information (i.e., acoustic char-
acteristics) of a measured environment. Preset programs come with their own
impulse-response data. Each channel of a program is assigned impulse-response data,
as shown below, and data can be loaded for channels individually on the Data Load
pages. See "Loading Impulse-Response Data" on page 61 for more information. The
impulse-response data for the preset programs is loaded into the Internal Card at the
factory. It's also on the supplied CD-ROM.
SREV1—Owner's Manual
Maximum Convolution Time per Channel (Fs = 48 kHz)
Mode
2-channel mode
Left
Right
2-channel program
Base System
5.46 sec
2.73 sec
2.73 sec
4-channel mode
Front-left
Front-right
Rear-left
Rear-right
4-channel program
with DSP Expansion Board
(DB-SREV1)
10.92 sec
5.46 sec
5.46 sec
2-channel x2 mode
A-left
A-right
B-left
B-right
2-channel program x2