FOCUSRITE / ISA428 mkII

Like the original ISA110, this is a 4ch mic preamplifier that incorporates a dual gain circuit using an input transformer, which is the true value of Focusrite, and fully inherits the high fidelity and transparent ISA sound.

～ From agent site ～

■ ISA428 MkII is a head amplifier equipped with 4 channel microphone input and 8 line input that adopted the traditional transformer input of ISA 110 module inherited from Focusrite Forte console. Achieving an affordable price while maintaining the same circuit design of mixing console quality. The ISA428 MkII is the perfect front end for professional recording, including a variable input transformer impedance switching function to take advantage of microphone characteristics and an optional 8-channel high-quality AD converter.
 
  
■ Since its release in 1985, the microphone preamplifier of the ISA110 has been evaluated from the beginning as "a warm and transparent sound" using the Lundahl L1538 transformer. It has evolved to allow you to choose from four different impedances (600Ω, 1400Ω, 2400Ω, 6800Ω) to take advantage of the characteristics of your microphone. With a solid foundation and steady evolution, the ISA series still gains overwhelming support. The optional 8-channel AD converter for 192KHz is common to the ISA828. Digitally converts four microphone and instrument inputs or line inputs and four line inputs.
 
■ Four instrument inputs for inputting guitars etc. are provided on the front panel, so there is no need to use DI individually, and they can be connected as they are, and these 1-4 channels can be inserted Points are prepared, and you can insert a compressor or EQ.

■ Features
・ Four mic preamplifiers using the Lundahl L1538 transformer of the ISA series
The mic pre that uses the Lundahl L1538 transformer input has reigned as the recording standard for many years, and its sound can be heard in many songs.
 
・ 8 channels @ 192kHz / 24-bit AD converter (optional)
The optional A / D converter has a dynamic range of 120 dB at a sampling frequency of 192 KHz and jitter of only 250 picoseconds.
 
・ Equipped with 4-stage impedance switching function
Four stages of Low: 600Ω, ISA110: 1400Ω, Mid: 2400Ω, High: 6800Ω are prepared to select the optimal input impedance for the microphone to be used. This gives you the perfect sound for every microphone, from the latest condenser mics to vintage ribbon mics.
 
・ Instrument input on front panel
You can connect a guitar etc. without using a D.I box.
 
・ Insert point
Each channel has an insert point so you can insert a compressor or EQ.
 
・ Equipped with a variable high-pass filter
Each channel is equipped with a high-pass filter and can be used in the range of 18dB / oct, 16Hz to 420Hz like the original ISA428.
 
・ LED peak meter with excellent visibility
The 6-point LED peak meter with fast response is installed for each channel, so that the output level can be monitored reliably.
 
・ Equipped with phantom power for each channel
 
■ Size: 88mm (H) x480mm (W) x280mm (D)
■ Weight: 5.5kg

* Comparison with the old product "ISA428 Pre Pack"
The new "ISA428 MkII" omits three functions: input VU meter, ADC soft limiter, and ADC bit depth switching.