音响系统声环境测试报告声学特性

..扩声系统声学特性

XXXXXXXXX测量报告测量：XXXXXXXXX202310受托付,对扩声系统的声学特性,按《厅堂扩声特性测量方法》国家标准,对最大声压级、传输频率特性、声场不均度、传声增益、系统总噪声级等五项声学特空场测量。现把测量状况归纳如下：一、XXXXXXXXX礼堂概况32m18m9m,总面积576平方米,总容积5184m³。可容纳观众47075°圆锥形,舞台两侧八字墙下方各嵌入安装K12KW181低音音箱一只,两组之间水平间距约为15.5m。台唇处各装有三只K8〔全频扬声K8105°圆锥形,以用作补声,三只扬声器之间3m4只K123只K8共计安装有四只K12扬声器,掩盖观众厅中后区,以满足多用途类扩声系统声学特性的要求。以上扬声器品牌均为QSC。二、测量标准及条件１、测量方法按GB/T4959－95《厅堂扩声特性测量方法》国家标准；扩声系统一级指标要求；3、测量仪器：美国TERRASONDE,TOOLBOX,ATB－PLUS型音频及配套用的标准测量用传声器。4、测试点位置：按国家标准GB/T4959－95《厅堂扩声特性测量方法》声场测量点规1/60470个,测试应选8个测量点。由于场地是对称的,按规定局部工程可以只测量中轴线一侧的2023109气温：20℃~23℃气压：991.3kPa相对湿度：83%20231010气温：19℃~23℃气压：1012kPa相对湿度：80%测量人员：XXXXXXXXX；XXXXXXXXX。四扩声系统声学特性要求：声学特性按GB50371－2023《厅堂扩声系统设计标准》标准文艺多用途类扩声系统一级指标要求如下：最大声压级：≥103dB；传输频率特性：以100Hz～6300Hz的平均声压级为0dB,在此频带内变化为-4dB～+4dB、50Hz～100Hz和6300Hz～12500Hz允许范围见该标准规定的频响图；a>最大声压级：105.6dB,详见测量结果附表1；b100Hz～6300Hz的平均声压级65.2为0dB,在此频带内变化为+2.7dB、-2.7dB2,及图2；c>传声增益：100Hz～6300Hz平均传声增益为-7.77dB；详见测量结果附表3；d100Hz：6.4dB、1000Hz：5.1dB、4000Hz：2.5dB,详见测4；e>5。由于背景噪声较大,系统总噪声低于背景噪声,所以系统总噪声级不能测得,估量可以到达NR20的要求。Ba>6；b5。六结论：通过测量结果和GB50371－2023比照得到：该礼堂扩声系统测量结果到达多用途类扩声系统声学特性一级指标要求。..6/9XXXXXXXXX 礼堂扩声系统声学特性测量数据附表一：最大声压级测试结果最大声压级测量结果测量点第1点第2点第3点第4点第5点第6点第7点第8点平均最大声压级声压级〔dB105108108105105105105104105.6附表二：传输频率特性

传输频率特性测量结果100Hz~6300Hz65.2dB0dB。在此频段范围内幅度变化为+2.7dB,－2.7dB各频率点的不均匀度/dB1000z5.1dB、6.3kHz2.9dB。在100Hz~10kHz频率范围内,全部小于标准要求的不平均度不超过8dB2f<Hz>5063801001251602002503154005006308001.0k1.25k1.6k2.0k2.5k3.15k4.0k5.0k6.3k8.0k10.0k12.5k16k全频带SPL<dB>测量点1点54.468.470.065.467.670.666.562.163.264.164.064.164.664.565.565.262.961.363.162.062.261.761.760.960.960.2782点57.467.971.767.372.972.369.964.463.264.967.668.067.768.066.166.263.263.566.264.564.064.264.864.165.263.1813点49.764.370.067.172.966.869.464.966.366.667.066.466.669.567.667.462.664.564.764.464.264.464.963.763.663.6814点51.960.763.863.667.465.665.063.265.266.266.966.565.765.865.164.161.662.662.762.061.863.262.061.361.559.2785点48.863.065.565.964.966.863.060.763.966.064.765.265.266.064.865.361.661.763.362.060.861.561.260.260.658.6786点49.061.366.164.965.966.964.264.161.962.862.964.866.165.566.465.864.063.365.064.363.363.062.362.063.261.1787点52.162.965.966.865.668.463.662.461.364.263.863.164.164.463.564.862.764.563.463.563.162.862.462.263.161.2788点46.763.666.060.965.365.762.561.960.363.863.963.264.866.164.264.961.462.964.663.662.662.562.761.961.359.8778个点平均51.364.067.465.267.867.965.563.063.264.865.165.265.666.265.465.562.563.064.163.362.862.962.862.162.460.978.6值10.77.77.96.486.77.44.26.03.84.74.93.65.14.13.32.63.23.12.522.93.73.94.65传输频率特性曲线图附表三：传声增益

图2传输频率特性曲线图传声增益测量结果传声器处OFF63.568.968.368.166.667.169.567.467.264.367.566.764.859.062.667.167.966.466.6传声器处ON64.769.970.068.667.667.770.467.967.265.268.667.664.959.663.367.768.466.566.61点46.653.860.658.756.455.759.358.757.655.062.061.961.454.657.062.563.059.658.92点46.560.360.057.057.558.462.559.461.458.464.161.558.455.557.862.965.159.961.43点45.957.857.456.956.859.562.862.660.858.765.863.562.554.558.464.764.961.362.14点42.854.854.755.759.758.261.862.659.756.765.862.360.753.857.062.663.359.859.95点47.351.452.052.657.959.163.460.158.855.764.461.460.653.356.461.962.758.158.16点43.752.055.056.159.258.459.856.157.455.063.960.261.754.657.461.564.159.459.9平均值45.55556.656.257.958.261.659.959.356.664.361.860.954.457.362.763.959.760f<Hz>f<Hz>1001251602002503154005006308001.0k1.25k1.6k2.0k2.5k3.15k4.0k5.0k6.3kSPL<dB>测量点增益-18-13.9-11.7-11.9-8.7-8.9-7.9-7.5-7.9-7.7-3.2-4.9-3.9-4.6-5.3-4.4-4-6.7-6.6从100Hz~6.3kHz平均值为-7.77dB,满足传声增益要求。声场不均匀度测量结果频率100Hz1kHz4kHz第1点65.464.562.0第2点67.368.064.5第3点67.169.564.4第4点63.665.862.0第5点65.966.062.0第6点64.965.564.3第7点66.864.463.5第8点60.966.163.6100Hz8个点的最大差值为67.3-60.9=6.4dB1kHz8个点的最大差值为69.5-64.4=5.1dB4kHz8个点的最大差值为64.5-62.0=2.5dB附表五：背景噪声背景噪声声测量结果频率631252505001k2k4k8k第1点41.434.528.927.726.726.026.326.8第2点43.936.430.328.826.526.126.427.2第3点46.138.129.930.227.525.726.326.8第4点52.437.632.027.527.826.726.226.9第5点42.734.328.327.026.125.926.227.3第6点37.830.327.425.825.525.625.926.9第7点40.630.726.525.425.125.326.026.79/9第8点35.2第8点35.228.125.926.425.625.926.326.78点平均值42.529.128.727.426.425.926.226.9频率第频率第1第2第3第4第6第86点平均值混响时间测量结果631252505001k2k4k8K1