TLAudio ebony Series A1&A2 通道条评测(二)

作者：margindge

原帖地址：http://www.audiobar.net/viewthread.php?tid=229016

接下来说说A2立体声处理器.

 

 TLAudio ebony series A2 Stereo Processor立体声处理器,亦为纯甲级电路设计,提供立体声的均衡处理器和压缩器模块,当然还包括Tube Stage功能.平衡卡农两进两出,带有数字扩展接口.

前面板左侧起,先是反相开关,可单独为通道A或通道B反相.下面是输入增益(-20dB～+20dB).往右为tube stage模块,与A1完全相同.不同的是其偶次谐波失真量为1%～10%可调.

往右是四个功能开关和输出增益旋钮,输出增益+/-20dB.
四个功能开关分别是:EQ PRE,EQ S/C,EQ ON,COMP ON.
EQ PRE,均衡前置.默认状态,输入信号先进入压缩模块才进入均衡模块.打开此开关后,信号先进入均衡模块.

EQ S/C(EQ Sidechain/Compressor),均衡旁链.打开此开关后,均衡模块旁链,输出信号给压缩模块作为监测电平,压缩器根据此信号来控制本来的音频信号.也就是说,信号分为两路,一路给均衡,一路给压缩.压缩用均衡输出的信号来控制直接给压缩器的信号,然后输出.此功能可作为人声的齿音消除器使用.比如在EQ上将齿音的频段增益6dB,那么当齿音所在的频段突起时,由于其在均衡上被增益6dB而超过压缩器的阈值,压缩器打开,以设定压缩动作对原始信号进行处理,从而降低齿音带来的问题.此功能的使用需要将EQ ON和COMP ON开关按下.这在实际工作中也是一个很实用的功能.

EQ ON&COMP ON:均衡打开和压缩器打开按钮.

此四按键开关极大的提高了该处理器的使用灵活性.且旁链均衡的功能不须其他设备就可完成,非常方便.

接下来是VU表模块,和A1相同,亦是开关切换通道A/通道B,输入/输出,电平/压缩量,以及+10dB指示开关.

往右是压缩模块和均衡模块.压缩模块旋钮可调参量为Threshold阈值(-20～+10dB),ratio压缩比(2:1～20:1)以及Gain make-up增益(0～20dB).按钮可选择Attack Time激发时间和Release Time恢复时间的Slow慢和Fast快.ATT(1ms/8ms);REL(200ms/2s).以及压缩拐点的Hard&Soft.看参数激发时间很快,实际使用很好,听感不算太快,不会出现压缩痕迹过为明显的状况.

均衡模块为三段式,中频频点可调(150Hz～7KHz,Q=0.7,+/-15dB).低频频点在80Hz,搁架式,+/-15dB.高频频点12KHz,搁架式,+/-15dB.遗憾的是Q值不可调.

以下是A2原理图,和A1设计理念完全相同.纯甲级电路,如果需要可加入电子管偶次谐波器.

 

 以下是厂家提供性能参数:

Line Inputs:
Discrete Class A circuitry from input to output (unless Tube stage In)
Gain Range: -20dB to +20dB
Maximum
Input level: +26dBu
Frequency Response: 10Hz to 40KHz, +0, -0.5dB
Distortion: 0.007% @ 1KHz, +4dBu @ 0dB gain
Distortion (THD + Noise): 0.025%, 10Hz to 40KHz
Noise: -94dBu, 22Hz to 22KHz, @ 0dB gain at input and output.
Outputs:
Gain Range: +/-20dB
Maximum Level: +22dBu (2Kohm load), +26dBu (10Kohm load)
Tube Stage:
Typical Distortion: 1% to 10%, depending on “Drive” level, predominately
second
harmonic
Noise: -88dBu (22Hz to 22KHz), output gain @ 0dB.
Compressor:
Threshold Range: -20dB to +10dB
Ratio Range: 2:1 to 20:1
Attack: 1ms (“Fast”), 8ms (“Slow”)
Release: 200ms (“Fast”), 2s (“Slow”)

Knee: “Hard” and “Soft” settingsGain Make-Up: 0dB to 20dB.
Equaliser:
LF: +/-15dB @ 80Hz, shelving
Mid: +/-15dB, swept 150Hz to 7KHz, Q = 0.7
HF: +/-15dB @ 12KHz, shelving
“Pre” and “Sidechain” (Compressor) switches.
Metering:
Tube “Drive” LEDs: Variable intensity over 10dB level range, typically corresponding to 1% to 5% THD.
Tube “Peak” LEDs: Dependant on level and drive, typically corresponding to 10% THD.
Output “Peak” LEDs: +19dBu on output.
VU Meter: Switchable to Channel A or B, Input or Ouput, and Gain Reduction.
Nominal calibration: 0VU = +4dBu.+10dB switch calibration: 0VU = +14dBu.
Power Requirements:
Internally set to 230V 50Hz or 115V 60Hz operation
Detachable IEC power cord
Power consumption 32VA.
Dimensions:
2U, rack mounting or free-standing.
W x H x D = 483mm x 88mm x 200mm (19.0” x 7.9” x 3.5”), behind front panel.
Shipping weight: 6Kg.