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Figure 7 — Sound pressure level at 200 Hz distribution in Podkarpacka Philharmonic plan for four different side wall shapes. A - existing wall, B - flat wall, C - waves shaped wall, D - wall with Schroeder diffuser

Figure 7 — Sound pressure level at 200 Hz distribution in Podkarpacka Philharmonic plan for four different side wall shapes. A - existing wall, B - flat wall, C - waves shaped wall, D - wall with Schroeder diffuser

Related Figures (11)

Figure 2 — Lviv Opera interior The volume of the room is about 7050 m°, and it is designed for 757 listeners (plus 43 in boxes). Interior is 35.5 m long, and 14 - 29.5 m wide. Height of the ceiling is between 4.7 and 11 m in the middle of the auditory. Lviv National Theatre of Opera and Ballet of Solomiya Krushelnytska was built in 1900. The audience volume is about 5500 m? designed for 998 listeners. In 2008 there was a renovation of the floor and upholstery (Figure 2). Four years later, Schroeder diffuser was mounted on the under balcony part of the rear wall. Diffusing panels are mounted on the concave surface of 12.6 x 1.8 m (Figure 3).
Figure 2 — Lviv Opera interior The volume of the room is about 7050 m°, and it is designed for 757 listeners (plus 43 in boxes). Interior is 35.5 m long, and 14 - 29.5 m wide. Height of the ceiling is between 4.7 and 11 m in the middle of the auditory. Lviv National Theatre of Opera and Ballet of Solomiya Krushelnytska was built in 1900. The audience volume is about 5500 m? designed for 998 listeners. In 2008 there was a renovation of the floor and upholstery (Figure 2). Four years later, Schroeder diffuser was mounted on the under balcony part of the rear wall. Diffusing panels are mounted on the concave surface of 12.6 x 1.8 m (Figure 3).
Figure 1 - Podkarpacka Philharmonic interior. In the analysis there were two objects included, that recently were renovated according to acoustic guidelines. In Figure 1, there is Artur Malawski Podkarpacka Philharmonic in Rzeszow. In the auditorium, there are characteristic large homogenious surfaces of ceiling, side walls and audience. In the philharmony, there are mostly symphonic concerts, as well as small theater plays and conferences. It is a fan-shaped room with amphitheater audience, divided into six sectors. Difference in audience heigth is 5 m, area of the audience: 530 m’. On the right side wall (looking at the stage) there are four boxes, that makes the room not symmetric. Stage area is equal to 270 m’. The ceiling is made of 3 meters long tilted equilateral triangles, that improve the sound field diffusiveness.
Figure 1 - Podkarpacka Philharmonic interior. In the analysis there were two objects included, that recently were renovated according to acoustic guidelines. In Figure 1, there is Artur Malawski Podkarpacka Philharmonic in Rzeszow. In the auditorium, there are characteristic large homogenious surfaces of ceiling, side walls and audience. In the philharmony, there are mostly symphonic concerts, as well as small theater plays and conferences. It is a fan-shaped room with amphitheater audience, divided into six sectors. Difference in audience heigth is 5 m, area of the audience: 530 m’. On the right side wall (looking at the stage) there are four boxes, that makes the room not symmetric. Stage area is equal to 270 m’. The ceiling is made of 3 meters long tilted equilateral triangles, that improve the sound field diffusiveness.
Figure 3 — Lviv Opera rear wall with sound diffuser
Figure 3 — Lviv Opera rear wall with sound diffuser
In Figure 4, there is a frequency characteristics of reverberation time T30 presented for empty and occupied room. Both characteristics fit the +/-20% tolerance for almost all frequencies. 3.1. Podkarpacka Philharmonic
In Figure 4, there is a frequency characteristics of reverberation time T30 presented for empty and occupied room. Both characteristics fit the +/-20% tolerance for almost all frequencies. 3.1. Podkarpacka Philharmonic
In Figures 6 (a, b) sound pressure levels depending on the distance from the stage for different shapes of side walls are presented, respectively for 800 and 1250 Hz.
In Figures 6 (a, b) sound pressure levels depending on the distance from the stage for different shapes of side walls are presented, respectively for 800 and 1250 Hz.
Figure 8 — Cross section of Podkarpacka Philharmonic with four different ceiling shapes. A - existing ceiling, B - flat ceiling, C - concave ceiling, D - ceiling with Schroeder diffuser. In the next stage, the influence of the ceiling's shape on the uniformity of sound pressure level in the audience area was analyzed. Four different variants of ceilings were analyzed (Figure 8).
Figure 8 — Cross section of Podkarpacka Philharmonic with four different ceiling shapes. A - existing ceiling, B - flat ceiling, C - concave ceiling, D - ceiling with Schroeder diffuser. In the next stage, the influence of the ceiling's shape on the uniformity of sound pressure level in the audience area was analyzed. Four different variants of ceilings were analyzed (Figure 8).
Figure 9 — Sound pressure level for frequency a) 800 Hz and b) 1250 Hz versus distance on the axis of the room from the sound source for four different shapes of the ceiling.
Figure 9 — Sound pressure level for frequency a) 800 Hz and b) 1250 Hz versus distance on the axis of the room from the sound source for four different shapes of the ceiling.
Figure 11 — Distribution of sound strength G4kHz in Lviv Opera measured for different wall acoustic treatment. a) sound absorbing upholstery, b) Schroeder diffuser, c) difference In Figure 11 sound strength Ga, distribution in Lviv Opera is presented. Figure 1la and 11b are results of Gaxrz measurement before (a) and after (b) acoustic treatment. Figure 11c depicts the impact of acoustic treatment of the rear wall on analyzed parameter. Sound strength Gaxy, distribution was selected as being the most sensitive on rear wall modification. Changing thick textile upholstery to Schroeder diffuser gives audible results especially for under balcony area. Sound diffusers on the rear wall improve uniformity of the sound field in the audience area and reduce the focusing effect in the middle of the auditorium [9].
Figure 11 — Distribution of sound strength G4kHz in Lviv Opera measured for different wall acoustic treatment. a) sound absorbing upholstery, b) Schroeder diffuser, c) difference In Figure 11 sound strength Ga, distribution in Lviv Opera is presented. Figure 1la and 11b are results of Gaxrz measurement before (a) and after (b) acoustic treatment. Figure 11c depicts the impact of acoustic treatment of the rear wall on analyzed parameter. Sound strength Gaxy, distribution was selected as being the most sensitive on rear wall modification. Changing thick textile upholstery to Schroeder diffuser gives audible results especially for under balcony area. Sound diffusers on the rear wall improve uniformity of the sound field in the audience area and reduce the focusing effect in the middle of the auditorium [9].
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