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也許你只需要2組麥克風前級音頻處理器，但它們需要最好的品質。ISA Two雙單頻道（dual-mono）麥克風前級音頻處理器就是你最好的解決方案：兩組獨立頻道最高品質的Focusrite麥克風前級音頻處理器，並有導線及樂器輸入端（不需要頟外的DI box）。
Lundahl 電晶體
ISA Two與經典的麥克風前級ISA產品有相同的電路，包含Lundahl L 1538變壓器及bespoke zobel網絡。
(經典的ISA110是建立起Focusrite控制器名聲的基石之一。)
可變的輸入阻抗並有最高80dB 的增益
ISA Two兩建有兩組線路輸入(XLR和TRS插孔)和獨立的D.I.頻道、增益控制、主動或被動阻抗切換、機體後方有TRS插孔能輸出到音箱還有獨立的XLR輸出。
靈活而獨立的D.I.能夠同時使用吉他與VOCAL，這滿足了樂手與工程師的心願。
在電路板裝有可變的的阻抗，可使用四種輸入阻抗設定。除了原始版的ISA110阻抗，還多了三種阻抗設定，能使用任何創意搭配任何一種麥克風。最高可有80dB 低雜訊之增益。
插入你所選擇的訊號處理器
每一個頻道有完整平衡式插入點可透過後面板的TRS插孔及前面板的啟動鍵。如此可以簡單使用外接的處理器來與ISA Two一起使用。如EQ，壓縮器（compressor）或限幅器（limiter）。
規格
兩頻道經典Focusrite ISA 電晶體為架構構的麥克風前級音頻處理器
前面板，每一個頻道：
l 1/4″ 樂器輸入端
l 可變式輸入阻抗- Low, ISA 110, Medium, High
l 輸入訊號選擇- Mic, Line, Instrument
l 0 – 30 dB/30 – 60 dB 增益開關
l 幻像電源開關
l 相位反轉開關
l 0 – 60 dB 增益以10 dB為一級
l 0 – +20 dB 持續可變的增益調整（trim）
l 可調式高通濾波器開關
l 插入點（Insert point）開關
l 8段LED 使用者可校準的音量表
l 單一電源開關
背面板，每一個頻道：
l XLR-F 麥克風輸入端
l 1/4″ TRS導線輸入端
l 1/4″ TRS 傳送端（Sends）
l 1/4″ TRS 回傳端（Returns）
l XLR-M 導線輸出端t
l 單一峰值表校準轉盤
l 單一個IEC電源插座
Measured Performance
Maximum Input and Output Levels |
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| Maximum Output Level | +24 dBu with a THD+N < 0.01% at 1kHz measured with 150 Ω source impedance and 22Hz/22kHz band-pass filter | |
| Maximum Microphone Transformer Input Level | +7 dBu with a THD+N < 0.7% at 1kHz measured at 0 dB of gain with 150 Ω source impedance and 22Hz/22kHz band-pass filter | |
Mic Input Response |
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| Gain range | 0 dB to +60 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim | |
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Input Impedance |
Switched Impedance setting Equivalent Input Impedance at 1 kHz |
Low = 600 Ω ISA 110 = 1.4 kΩ Med = 2.4 kΩ High = 6.8 kΩ |
| EIN (Equivalent Input Noise) |
Measured at 60 dB of gain with 150 Ω source impedance and 22 Hz-22 kHz band pass filter |
-127 dB |
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Noise |
Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter | -97 dBu |
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Signal-to-Noise Ratio |
Measured with 150 Ω source impedance and 22 Hz-22 kHz band pass filter | 121 dB relative to max output +24 dBu |
|
Total Harmonic Distortion + Noise |
Measured with a -20 dBu input signal at +30 dB of gain and with a 22 Hz-22 kHz band pass filter | < 0.0007% at 1 kHz |
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Frequency Response |
At minimum gain (0 dB) | -0.5 dB at 10 Hz, -1 dB at 135 kHz, relative to 1 kHz |
| At +60 dB gain | -6 dB at 10 Hz, -1 dB at 115 kHz, relative to 1 kHz |
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CMRR (Common Mode Rejection Ratio) |
-94 dB for mic input at 60 Hz for max. output = +24 dBu -91 dB for mic input at 10 kHz for max. output = +24 dBu |
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Crosstalk Channel to Channel |
Mic input, with I/P = 0 dBu, gain = 0 dB @ 1 kHz input to channel A, channel B output = -85 dB | |
Line Input Response |
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Gain Range |
-20 dB to +10 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim | |
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Input Impedance |
10 kΩ from 10 Hz to 200 kHz | |
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Noise |
Noise at main output with gain at unity (0 dB) measured with 50 Ω source impedance and a 22Hz – 22 kHz band pass filter |
-97 dBu |
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Signal-to-Noise Ratio |
Measured with 50 Ω source impedance and a 22 Hz-22 kHz band pass filter |
121 dB relative to max output +24 dBu |
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Total Harmonic Distortion + Noise |
Measured with a 0 dBu input signal, +10 dB of gain and a 22 Hz-22 kHz band pass filter |
< 0.002% at 1 kHz |
|
Frequency Response |
At unity gain (0 dB) | -0.3 dB at 10 Hz, -1 dB at 80 kHz, relative to 1 kHz |
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Crosstalk Channel to Channel |
Line input, with I/P = 0 dBu, gain = 0dB @ 1 kHz input to channel A |
Channel B output |
Instrument Input Response |
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Gain Range |
+10 dB to +40 dB continuously variable trim | |
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Input Impedance |
> 2 MΩ | |
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Noise |
>Measured with 22 Hz-22 kHz band pass filter | Minimum gain (+10 dB) = -95 dBu |
|
Frequency Response |
At minimum gain (+10 dB) |
-0.1 dB at 10 Hz, |
| At maximum gain (+40 dB) |
-2.5 dB at 10 Hz, |
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High-Pass Filter |
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Roll-Off |
18 dB per octave (3 pole filter) | |
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Frequency Range |
Continuously variable from 16 Hz to 420 Hz (-3 dB) | |
Weight and Dimensions |
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W x D x H |
480 mm x 280 mm x 44 mm | |
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Weight |
3.7 kg | |
下載連結:
http://global.focusrite.com/mic-pres/isa-two/downloads