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Knowledge Base > Discontinued Products > 450 Dual Zone Priority Mixer

How do I disable the phantom power from the mic inputs on the 450 Dual Zone Priority Mixer?

To disable phantom power from microphone input #1:

1. Disconnect power from the 450.
2. Remove the 0-ohm jumper R48 in the extreme left rear corner of the 450.
3. To disable phantom power from microphone input #2:

Disconnect power from the 450.
Remove the 0-ohm jumper R172 in the left center area of the 450 circuit board.

What is the stereo separation on the 450 Dual Zone Priority Mixer?

Greater than -60 dB when measured at 1000 Hz.

Greater than -35 dB when measured with a 18 kHz tone.

Where can I find Schematics for the 450 Dual Zone Priority Mixer?

How do I convert the stereo outputs to mono on the 450 Dual Zone Priority Mixer?

Disconnect power from the 450.
Solder a insulated wire jumper to the rear half of JP8. Be careful not to bridge the gap between the front and rear portion of JP8.
Solder the other end of the wire jumper to the rear half of JP9. Be careful not to bridge the gap between the front and rear portion of JP9.

Where can I find a User's Guide for the 450 Dual Zone Priority Mixer?

Where can I find a Data Sheet for the 450 Dual Zone Priority Mixer?

Where can I find a Flow Chart for the 450 Dual Zone Priority Mixer?

Where can I find AutoCAD files for the 450 Dual Zone Priority Mixer?

How do I lengthen priority release time on the 450 Dual Zone Priority Mixer?

Increase the value of the following resistors for the appropriate priority:

Priority 1: R229 and R230
Priority 2: R321 and R322
Priority 3: R141 and R142

The amount of time increases in direct proportion to the amount that you increase the value of R229 and R230. For example, if you double the value of Priority 1’s R229 and R230 (from 536K to 1Meg – O.K., its approximately double), then the length of time for the muting circuit to release and allow signal from the lower priorities will also double (from 2-3 seconds to 4-6 seconds).