The Processing Section is crucial for the 'sound' of the device. The quality of the processing stages determines how effective the signal can be modified and enhanced. The IO5-D/e offers in addition to the switched insert section and the hi-pass, low-pass filters 2 independent equalizers. EQ 1 is a 5 band equalizer with 3 fully parametric bands; EQ 2 is a 3 band version with a fully parametric mid band.

Inline Channel 5MT Series D

Processing Section

The IO5-D/e inline channel offers the unique feature of two totally independent equalizers in addition to the Filter Section with hi-pass and low-pass filters. The sophisticated 5 band Split Equalizer as it used with the IO5-D/c is combined with an additional 3 band EQ and a switched Insert section.

All the elements are part of the tape chain, however, separate REC switches make it possible to move every single element into the record chain. In addition, the Insert section can be switches pre and post the equalizers. The 5 band EQ can be used in Split mode as well. The 5 band EQ is divided into a 2 band and a three band EQ when Split mode is active. The 2nd, 3 Band EQ can be used in the record chain or in the tape chain. Many combinations are possible.

Signal Flow

The processing stages are driven from the output of the input reverse sections default to the tape chain. Each section has its own REC switch, that moves the particular device in the record chain. The first element in the processing chain is the hi-pass. low-pass filter section. The output of the filter section feeds the Insert section in PRE EQ mode. The Equalizers are in series connection. The output of the 3 band EQ feeds the input of the 5 band equalizer. The default insert position is post EQ so it is pre fader, be,hind all the processing stages unless it is routed PRE.

The sequence of the elements is not affected by the assignment of a particular element to the tape or record chain. If a unit is in the tape chain, its position in the record chain is simply bridged.

Have a look at the
Block Diagram Processing Section
to see all processing stages and their connections.

Wihle the 3 band EQ can be moved from its default position in the Tape Chain to the Record Chain, a SPLIT function makes possible to divide the 5 band equalizer into 2 independent EQ's. EQ 1 is a 2 band EQ, using the HI-LOW bands; EQ 2 is a 3 band EQ, using the three MID bands. In combination with the REC switch of the EQ section it is possible to assign both the EQ either to the record or tape chain, depending on the setting of the switches.

This Block Diagram shows, how the EQ's are assigned,

Split only moves the 3 band Mid EQ to the record chain while the 2 band Hi Low EQ remains in the tape chain. If both Record and Split are pressed at a time, the 3 band EQ is in the tape chain, while the 2 band EQ is in the record chain.

The OFF switch above the SPLIT button bypasses the splitted 3 band MID EQ, however, the split function is still active. This switch is necessary to make sure, that is is possible to switch off the 3 band EQ without affected the 2 band EQ in the other chain, as it would happen when Split is released.

The Split function does alter the 2nd, 3 band EQ in any way.