ISA Two

Focusrite ISA Two

ISA Two(2)

 

也許你只需要2組麥克風前級放大器,但它們需要最好的品質。ISA Two雙單頻道(dual-mono)麥克風前級放大器就是你最好的解決方案:兩組獨立頻道最高品質的Focusrite麥克風前級放大器,並有導線及樂器輸入端(不需要頟外的DI box)。

 

Lundahl 電晶體

ISA Two(3)

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(4)

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

ISA Two(5)

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

ISA Two(6)

兩頻道經典Focusrite ISA 電晶體為架構構的麥克風前級放大器

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

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

Gain range 0 dB to +60 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim

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

Noise

Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter -97 dBu

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

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

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

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

Gain Range

-20 dB to +10 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim

Input Impedance

10 kΩ from 10 Hz to 200 kHz

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

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

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

Crosstalk Channel to Channel

Line input, with I/P = 0 dBu, gain = 0dB
@ 1 kHz input to channel A

Channel B output
= -91 dB

Instrument Input Response

Gain Range

+10 dB to +40 dB continuously variable trim

Input Impedance

> 2 MΩ

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,
-1 dB at 115 kHz, relative to 1 kHz

At maximum gain (+40 dB)

-2.5 dB at 10 Hz,
-1 dB at 110 kHz, relative to 1 kHz

High-Pass Filter

Roll-Off

18 dB per octave (3 pole filter)

Frequency Range

Continuously variable from 16 Hz to 420 Hz (-3 dB)

Weight and Dimensions

W x D x H

480 mm x 280 mm x 44 mm

Weight

3.7 kg

下載連結:

http://global.focusrite.com/mic-pres/isa-two/downloads