The O.P.R Plan 4 FET
When the 47 FET arrived in the early 1970s, it wasn’t nostalgia — it was evolution.
The original tube 47 had already become legend. But studios were getting louder. Drums were bigger. Bass amps were angrier. Engineers needed a microphone that could take punishment and still sound like a record.
So the tube gave way to FET.
Tighter low end. Faster transient response. Greater consistency.
Control without compromise.
The 47 FET became the quiet hero of control rooms everywhere — kick drum, bass cab, brass, rock vocals. It wasn’t glamorous. It was dependable. It worked.
The O.P.R Plan 4 FET carries that spirit forward — while offering something more.
For the first time, you can choose between two distinct sonic signatures:
O.P.R K4-T7 (K47-Style) Capsule
O.P.R EM-7 (M7-Style) Capsule
Both hand-built here in Australia.
The Sound
Think:
Big, controlled low end.
Forward mids that place a vocal exactly where it belongs — without begging.
Detail without brittleness.
Authority without hype.
A microphone that tells the truth, and does it with weight.
Capsule Options
 
O.P.R EM-7 (M7-Style)
$1500.00 Plus Tax and shipping
Warm, rich, and textured in all the right ways.
Organic top end. Full, dimensional mid-range.
O.P.R K4-T7 (K47-Style)
$1350.00 Plus Tax and shipping
Tighter. Punchier.
More focused through the mids.
Precision with attitude.
Whether it’s vocal, bass cab, kick, piano, or a guitar amp that needs taming — the Plan 4 doesn’t ask for permission.
It earns its place in the mix.