Grange stone circle (B), Co. Limerick, Ireland

Information

Description: 
The Grange stone circle (B) at Lough Gur (from around 2900 BCE) has an internal diameter of ~45.5m and its standing stones are on average slightly higher than 1.5m (some are though higher). There is an earthen bank (~9m wide and ~1m high) along the standing stones (on outside). Most IRs have the dawn chorus on it and a high pass filter at 150 Hz has been used to remove wind noise...
Measurement Team: 
Victor Reijs
Capture Date: 
Tue, 26/04/2016
Source Sound: 
Paper banger
Source Sound Category: 
Other
Microphone(s): 
Zoom H1 build in X/Y unidirection microphones
Space Category: 
Arena
Open Air
Generation Type: 
Real World

Analysis

Analysis Description: 
This impulse response was recorded when mic stood 10m from Rannach Crom Dubh, while paper banger was in the centre and mic directed to the centre).
Demonstration Impulse Response: 

Waveform

impulseClick here or on the waveform to upload a sound from your computer and hear it in this space

Acoustic Parameters


Octave Band
31.25 Hz62.5 Hz125 Hz250 Hz500 Hz1 kHz2 kHz4 kHz8 kHz16 kHz

Reverberation Time RT60 T30 (seconds)
5.275.184.694.151.210.850.913.753.133.28

Early Decay Time EDT (seconds)
2.372.370.580.580.580.450.450.580.450.20

Definition D50
0.600.630.490.530.340.300.340.670.900.96

Clarity C50 (dB)
1.672.23-0.150.53-2.88-3.65-2.963.179.5013.81

Clarity C80 (dB)
3.663.000.713.8710.5417.2914.718.7513.4618.00


Example Audio



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Impulse Responses

Format(s): 
Mono
Mono: 

Sample Rate: 48 kHz
Number of Channels: 1
Bits per Sample: 24
Duration: 0.96 s
File Size: 134.43 KB
File Format: wav
Source Sound: Paper banger
Microphone: Zoom H1 build in X/Y unidirection microphones
Source Receiver Distance (m): 15 m
Source Height: 1.1 m
Receiver Height: 1.1 m
Temperature: 5 °C


Sample Rate: 48 kHz
Number of Channels: 1
Bits per Sample: 24
Duration: 1.29 s
File Size: 181.96 KB
File Format: wav
Source Sound: Paper banger
Microphone: Zoom H1 build in X/Y unidirection microphones
Source Receiver Distance (m): 10 m
Source Height: 1.1 m
Receiver Height: 1.1 m
Temperature: 5 °C


Sample Rate: 48 kHz
Number of Channels: 1
Bits per Sample: 24
Duration: 1.11 s
File Size: 155.95 KB
File Format: wav
Source Sound: Paper banger
Microphone: Zoom H1 build in X/Y unidirection microphones
Source Receiver Distance (m): 5 m
Source Height: 1.1 m
Receiver Height: 1.1 m
Temperature: 5 °C


Sample Rate: 48 kHz
Number of Channels: 1
Bits per Sample: 24
Duration: 1.27 s
File Size: 179.14 KB
File Format: wav
Source Sound: Paper banger
Microphone: Zoom H1 build in X/Y unidirection microphones
Source Receiver Distance (m): 10 m
Source Height: 1.1 m
Receiver Height: 1.1 m
Temperature: 5 °C

Images

Photographs and Diagrams: 
Rannach Crom Dubh, which is a good reflector
Part of the circle
Part of circle with passage and Rannach Crom Dubh
The slight tilt of Rannach Crom Dubh
The standing stone flanking the passage

Location

Address: 
Grange stonce circle (B) Lough Gur, LM
Ireland
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Attribution

Attribute this work to: 
www.openairlib.net
www.archaeocosmology.org/eng/woodcircleaoucistictestplan.htm
https://www.academia.edu/33589224/Acoustic_and_aural_research_at_timber_and_stone_circles