transformer coupled microphone pre amp, with phantom power and phase reverse. A four band Focusrite EQ section follows, based on the EQ circuits featured in the ISA 430 and ISA 110. The compressor features a proprietary Class A VCA with side chain circuitry, and can be placed in the signal flow before the EQ at the press of a button, if desired. Also included is a unique feature labelled Blend, which provides a means of achieving smoother compression at extreme settings by mixing uncompressed source signal along with the compressed portion. The ISA220 also features an opto based de esser which uses a combination of EQ and phase cancellation to create a smoother and less obtrusive result. Last but not least, a frequency adaptive, 3 band limiter is provided to ensure distortion free limiting. For visual reference, ISA 220 provides a classic analogue VU style meter which can be switched to display input or compressor gain reduction levels. A pair of 16 segment LED meters are included to display output levels, both analogue and digital in conjunction with the optional 24 bit96 kHz stereo digital output AESEBU, SPDIF & TOSLINK card. This card offers 44.1 96 kHz operation and can be used as a high quality mono stereo tracking converter, or at mix down as a stereo converter for final mastering. ISA series transformer based pre ampThe benefits of Focusrites classic pre amp topology include superb common mode rejection, an excellent overload margin, an extremely low n
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