BSA Microphones RS4

RS-Series N°4

For our second RS-Series release we focus on the distinctive forward midrange sound of Berlin: The RS4 can be built in the direction of either the U47 or M49B. Same as the RS2, all electronics are wired point-to-point using only the highest grade materials available. Its unique but classic looking body is manufactured from brass, with finishing in nickel, PVD and black chrome.

Handcrafted in Switzerland, the RS-Series represents the very best microphones and accessories we can build, both in finish and performance. Every unit is built to order, and can be customized according to customer preference.


RS4 Owner's manual

CHF 4'280,00


+ Product Features

• U47 or M49, fixed-bias circuit
• Haun K47 capsule
• Haufe BV8 or BV11 transformer
• NOS vacuum tube
• RS-6120 power supply
• Swivel stand mount
• 10-year warranty
• Handcrafted in Switzerland

+ Specifications

• Type: Cond. pressure gradient
• Capsule: K47, Mylar diaphragm
• Patterns: Dual or Multi
• Freq. Range: 20Hz to 20kHz
• Max SPL: ≈ 130dB
• Noise: 10 dB, A-weighted
• Dimensions: 216 x ø51mm
• Weight: 850gms

+ Options & Settings

• Custom wood-box (optional)
• Thiersch M7 capsule (optional)
• Original K47 capsule (optional)
• Plate Supply: 120V
• Plate Current: ≈ 1mA
• Heater Voltage: -6,30V
• Heater Current: 200mA
• Impedance: 200Ω