Ras EFX is best known for sirens and effect units. That is a shortcut: the workshop also builds full sound system preamps.
The preamps
| Model | What it is |
|---|---|
| MP-400 | portable |
| RAS-3000 | 3 way |
| RAS-5000 | 4 way |
| RAS-5500 | 5 way |
| ST-4000 | studio |
The technical choices
- Fully analog, all transistor — no valves, no DSP.
- Semi-parametric EQ per way and kill switches.
- Three assignable send/return loops — you choose which ways your effects come off.
The three assignable loops are what really sets the range apart. On many preamps the effect send is single and taken off the mix. Here you can send a delay on the mids without dragging the sub along, which changes how you play.
Ordering
Custom is the rule rather than the exception. For sirens and effects, budget £90 to £760, and the online shop takes the order directly. Preamps go through a quote.
A practical detail: the effects run on a 9 V pedal power supply. That is a sensible choice live, where that kind of supply is replaceable anywhere and easy to daisy chain.
Who it is for
A sound that plays a lot with effects and wants to route them per band rather than across the whole mix. The MP-400 answers something else: a preamp you carry.
→ All dub preamp manufacturers
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