Soundtracs Topaz 12 4 Manual (LIMITED — 2026)

The block diagram is the single most important page. It shows how signal flows from the mic preamp, through the EQ, aux sends, pan pot, fader, and finally to the group/master busses. Without this, troubleshooting dead channels is guesswork.

The Topaz series is designed with a "British sound" philosophy, featuring clean preamps and musical EQ.

Mic Preamps: Uses Analogue Devices IC mic amps with an EIN of -128dBu, providing high headroom and low noise.

Frequency Response: Essentially flat from 10Hz to 40kHz (±1dB). Crosstalk: Better than 85dB at 1kHz between channels. Dimensions: Approximately 405mm x 445mm x 85mm. Channel Strip & Routing

The console uses an inline channel topography, meaning each strip contains both a main signal path and a monitor signal path. Soundtracs Topaz 12 4 Manual

Mono Channels (1-10): Include balanced XLR mic inputs, balanced line-level jack inputs, and a post-EQ insert point (wired Tip-Send/Ring-Return).

Stereo Channels (11-12): Line-level only with unbalanced jack sockets; connecting only the Left input provides a mono signal.

EQ Section: Typically features a 4-band EQ in the main path and a 2-band EQ in the monitor path.

Tape Send/Return: Signals can be routed directly to multitrack recorder tracks using the Bus button. The block diagram is the single most important page

Solo & Mute: Available for both main and monitor signal paths. Master Section & Monitoring Soundtracs Topaz: monitors, interfaces and routing

The Topaz 12/4 uses a 5-pin XLR connector for its external power supply (usually the PS-424 or PS-450). Without the manual, you won’t know the pinout. Here it is, verified by multiple owners:

Note: The 48V phantom power is derived internally from the +15V rail via a voltage doubler. Do not expect a separate 48V pin.

If you own a Topaz 12-4, you likely own a used one. Here is how to keep it running smoothly: The Topaz 12/4 uses a 5-pin XLR connector

Unlike a Mackie 1604, which you can figure out in ten minutes with a drumstick and a beer, the Topaz is weird. It’s a split console design (like a big SSL) masquerading as a small project mixer.

Here is what the manual explains that common sense does not:

For the 12/4, this includes: