leslie
- 论坛博士后
- 19720110
- 27155
- 28495
- 2003-01-24
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leslie论坛博士后
12#
t
T
发表于 2011-04-25 12:14
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Bryston 2B SST C-Series Amplifier
- Measurements were made at 120V AC line voltage with both channels being driven. Measurements made on the left channel and the unbalanced inputs unless otherwise noted.
- This amplifier does not invert polarity.
- AC line current draw at idle: 0.37A.
- Input impedance @ 1kHz: 9.9k ohms.
- Output impedance at 50Hz: 0.026 ohms.
- Input sensitivity for 1W output into 8 ohms:
- 1V sensitivity: 99.6mV
- 2V sensitivity: 197.8mV
- Gain (8-ohm load), unbalanced and balanced inputs:
- 1V sensitivity: 28.4X, 29.1dB.
- 2V sensitivity: 14.3X, 23.1dB.
- Output noise, 8-ohm load, unbalanced input, 1k-ohm input termination, Lch/Rch:
- 1V sensitivity: wideband - 0.21mV, -82.6dBW / 0.18mV, -83.9dBW
- 2V sensitivity: wideband - 0.18mV, -83.9dBW / 0.13mV, -86.8dBW
- 1V sensitivity: A weighted - 0.11mV, -88.2dBW / 0.046mV, -95.8dBW
- 2V sensitivity: A weighted - 0.10mV, -89.0dBW / 0.032mV, -98.9dBW
- Output noise, 8-ohm load, balanced input, 600-ohm input termination, Lch/Rch:
- 1V sensitivity: wideband - 0.29mV, -79.8dBW / 0.28mV, -80.1dBW
- 2V sensitivity: wideband - 0.21mV, -82.6dBW / 0.16mV, -85.0dBW
- 1V sensitivity: A weighted - 0.11mV, -88.2dBW / 0.069mV, -92.3dBW
- 2V sensitivity: A weighted - 0.10mV, -89.0dBW / 0.040mV, -97.0dBW
Power output with 1kHz test signal
- 8-ohm load at 1% THD: 127W
- 8-ohm load at 10% THD: 163W
- 4-ohm load at 1% THD: 213W
- 4-ohm load at 10% THD: 235W
General The Bryston 2B SST C-Series is a medium-power solid-state stereo power amplifier, the lowest-powered unit in Bryston’s SST C-Series line. Chart 1 shows the frequency response of the amp with varying loads. The high-frequency response is moderately wide with an approximate 3dB down point of 100kHz. Output impedance, as judged by the closeness of spacing between the curves of open-circuit, 8-ohm, and 4-ohm loading, is quite low in the audio band. The usual NHT dummy-load curve is not shown as the variations in the response would not display. The variation with the NHT dummy load in the audio range is of the order of +/-0.05dB -- a negligible amount. Chart 2 illustrates how total harmonic distortion plus noise vs. power varies for 1kHz and SMPTE IM test signals and amplifier output load. The amount of distortion is low right up to clipping --- the behavior of most solid-state power amplifiers. The distortion performance was essentially identical with unbalanced and balanced connections. Total harmonic distortion plus noise as a function of frequency at several different power levels is plotted in Chart 3 for 4-ohm loading. The amount of rise in distortion at low and high frequencies is admirably low, except at the 180W level where distortion started to rise abruptly below 20Hz, most likely due to power-supply limitations. This didn’t happen with the 8-ohm loads at the rated 100W power output. Damping factor vs. frequency is shown in Chart 4 and is of a value and nature typical of many solid-state amplifiers, being high up to about 1kHz and then rolling off with frequency. The left channel of this unit had somewhat more power-supply line harmonics due to rectifier conduction-pulse ground currents than the quieter right channel. Therefore, the spectrum of both channels is shown in charts 5A and 5B for a 10W 1kHz test signal with 8-ohm loading. As can be seen, the left-channel spectrum has many line harmonics that extend way up into the test-signal area, whereas the right-channel spectrum is more normal looking with low amounts of line harmonics and a tapering-off spectrum of test-signal harmonics.
Chart 1 - Frequency Response of Output Voltage as a Function of Output Loading |
 Red line: open circuit Magenta line: 8-ohm load Blue line: 4-ohm load
Chart 2 - Distortion as a Function of Power Output and Output Loading |
 (line up at 70W to determine lines) Top line: 4-ohm THD+N Second line: 8-ohm SMPTE IM Third line: 8-ohm THD+N Bottom line: 4-ohm SMPTE IM
Chart 3 - Distortion as a Function of Power Output and Frequency |
 4-ohm output loading Grey line: 180W Cyan line: 100W Blue line: 30W Magenta line: 10W Red line: 1W
Chart 4 - Damping Factor as a Function of Frequency |
 Damping factor = output impedance divided into 8
Chart 5 - Distortion and Noise Spectrum |
5A - left channel
 1kHz signal at 10W into an 8-ohm load 5B - right channel
 1kHz signal at 10W into an 8-ohm load
- 测量是在120V交流线路电压均为驱动渠道。 测量就左声道,除非另有说明,非平衡输入。
- 该放大器的极性不能倒置。
- 交流线电流消耗在空闲:0.37A。
- @ 1kHz的输入阻抗:9.9k欧姆。
- 在50Hz输出阻抗:0.026欧姆。
- 1W的输入灵敏度为8欧姆的输出:
- 1V的灵敏度:99.6mV
- 2V的灵敏度:197.8mV
- 增益(8欧姆负载),不平衡和平衡输入:
- 1V的灵敏度:28.4X,29.1分贝。
- 2V的灵敏度:14.3X,二十三点一分贝。
- 输出噪声,8欧姆负载,不平衡输入,1K的欧姆输入终端,廖创兴/ Rch的:
- 1V的灵敏度:宽带 - 0.21mV,- 82.6dBW / 0.18mV,- 83.9dBW
- 2V的灵敏度:宽带 - 0.18mV,- 83.9dBW / 0.13mV,- 86.8dBW
- 1V的灵敏度:A加权 - 0.11mV,- 88.2dBW / 0.046mV,- 95.8dBW
- 2V的灵敏度:A加权 - 0.10mV,- 89.0dBW / 0.032mV,- 98.9dBW
- 输出噪声,8欧姆负载,平衡输入,600欧姆的输入终端,廖创兴/ Rch的:
- 1V的灵敏度:宽带 - 0.29mV,- 79.8dBW / 0.28mV,- 80.1dBW
- 2V的灵敏度:宽带 - 0.21mV,- 82.6dBW / 0.16mV,- 85.0dBW
- 1V的灵敏度:A加权 - 0.11mV,- 88.2dBW / 0.069mV,- 92.3dBW
- 2V的灵敏度:A加权 - 0.10mV,- 89.0dBW / 0.040mV,- 97.0dBW
功率输出1kHz的测试信号
- 8欧姆负载,1%总谐波失真:127W
- 8欧姆负载为10%总谐波失真:163W
- 4欧姆负载,1%总谐波失真:213W
- 4欧姆负载为10%总谐波失真:235W
一般 海温的Bryston乙C系列是一个中等功率固态立体声功率放大器,在Bryston的海温C系列线最低的供电单位。 图1显示了用不同的负载放大器的频率响应。 高频率响应宽,适度降低100kHz的点近似3dB的。 输出阻抗,如之间开路,8欧姆,4欧姆负荷曲线间距接近判断,是相当低的音频频带。 通常莱科萨斯假负载曲线没有显示如响应不会显示的变化。 与音频范围内的变化是莱科萨斯假负载的+ / -0.05分贝秩序 - 微不足道。 图2说明了总谐波失真加噪声与功率1kHz的测试信号和SMPTE的IM和放大器的输出负载变化。 失真的数量很少直到剪辑---大多数固态功率放大器的行为。 失真的表现基本上是平衡与不平衡和连接相同。 总谐波失真加作为频率的函数噪声功率水平在几个不同的是在图3所示为4欧姆负载。 在低失真和高增长量是令人钦佩的频率低,除了在180瓦水平,失真开始崛起低于20Hz的,最有可能因电力供应的限制。 这并没有发生与在额定100W功率输出的8欧姆负载。 阻尼系数与频率是在图4所示,并与自然的价值,许多固态放大器,典型的是,被高至约1kHz的频率,然后滚动关闭。 该单位的左声道有较为电源线由于整流谐波比安静的右声道传导电流脉冲地面。 因此,这两个频道频谱显示在图表5A和5B 1kHz时为10W的8欧姆负载试验信号。 可以看出,左边的通道频谱谐波,有许多行一路延伸到测试信号区,而右声道是比较正常的频谱与低量的线路谐波和逐渐减少的测试过的频谱看,信号的谐波。
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