/usr/share/jconvolver/config-files/spacenet/lyddington-amb.conf is in jconvolver-config-files 0.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2007-2009 Fons Adriaensen <fons@linuxaudio.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# -----------------------------------------------------------------------------
#
# jconvolver configuration -- St. Andrews Church, Lyddington, UK.
# ---------------------------------------------------------------
#
# Origin of IR files: http://space-net.org.uk/node/53
#
# Description on the space-net site:
#
# St Andrew’s Church, built in the 14th Century, has one of the finest
# examples of in-situ acoustic jars (vases or pots) in the UK. These
# jars were common to European church construction in the late Middle
# Ages and are said to be based on the ideas of Roman architect Vitruvius,
# who discussed the use of resonant jars in the design of amphitheatres
# to provide clarity of voice presentation. They are designed as Helmholtz
# resonators, giving narrow band energy absorption according to the natural
# frequency of the jar although there is little conclusive acoustical
# evidence to show that they behave as designed. Studies suggest that the
# success or otherwise of these devices depends on the number of jars used
# and their placement, as well as the characteristics of the building and
# jars themselves. In anechoic and reverberant chambers the absorption
# effects of such jars are weak and highly selective, although can be
# significant below 200Hz. Together with their additional diffusive effects,
# the jars potentially help to eliminate strong normal modes and hence can
# be made effective with careful tuning and positioning. St Andrew’s Church
# has 11 jars placed high in the chancel, 6 in the north wall and 5 in the
# south, arranged at irregular intervals such that there are no directly
# opposite pairs.
#
# Location: Lyddington, UK
# Size (Approx): 2600m3
#
# Source: Log. Swept Sine; 20-22k Hz; 15s long
# Input: Genelec S30D
# Source Location: Centre of altar steps, chancel
# Mic Location: Centre of nave
# Source-Microphone Distance: 11.5m
# Microphone: Soundfield SPS-422B
#
# ISO 3382 - T30:
# Freq (Hz) 31.5 63 125 250 500 1k 2k 4k 8k 16k
# T30 (s) 2.04 2.01 1.44 1.28 1.23 1.49 1.46 1.24 0.86 0.51
#
# -----------------------------------------------------------------------------
#
# Comments (FA):
#
# The two original WAV files had a 6-line text preamble which had to
# be removed to make them readable as regular WAV files. They have
# been combined into a single 4-ch WAVEX file using makemulti, without
# any further changes. You can also use the two original files after
# removing the text preamble.
#
# Measuring and viewing the responses revealed what are probably gain
# errors in the equipment used to capture the responses. These are
# approximately corrected by the gain factors used below.
#
# The offset of 2055 samples cuts off the direct sound and the first
# 5 ms of the response.
#
# -----------------------------------------------------------------------------
#
# Replace by whatever required...
#
/cd /audio/reverbs/spacenet
#
#
# in out partition maxsize
# -----------------------------------------------
/convolver/new 1 4 256 100000
#
#
/input/name 1 Input
#
/output/name 1 Out.W
/output/name 2 Out.X
/output/name 3 Out.Y
/output/name 4 Out.Z
#
#
# in out gain delay offset length chan file
# ---------------------------------------------------------------------
#
/impulse/read 1 1 0.100 0 2055 0 1 Lyd3_000_WXYZ_48k.amb
/impulse/read 1 2 0.204 0 2055 0 2 Lyd3_000_WXYZ_48k.amb
/impulse/read 1 3 0.193 0 2055 0 3 Lyd3_000_WXYZ_48k.amb
/impulse/read 1 4 0.257 0 2055 0 4 Lyd3_000_WXYZ_48k.amb
#
#
# Or using the original files:
#
#
#/impulse/read 1 1 0.100 0 2055 0 1 Lyd3_000_WX_48k.wav
#/impulse/read 1 2 0.204 0 2055 0 2 Lyd3_000_WX_48k.wav
#/impulse/read 1 3 0.193 0 2055 0 1 Lyd3_000_YZ_48k.wav
#/impulse/read 1 4 0.257 0 2055 0 2 Lyd3_000_YZ_48k.wav
#
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