Monday, May 2, 2011

Forssell Technologies - SMP-2 Two Channel Mic Preamp

"The SMP-2 is an extremely high-quality, sonically neutral two-channel microphone preamplifier designed for the most demanding applications."

"The SMP-2 microphone preamplifier is housed in a 1U rack mount chassis. It is a two channel mic preamp with individual controls for each channel.
Front panel controls include: 
Mute switch (mutes output), polarity reverse switch (relay), phantom power, 24 position rotary gain switch, and dual color LED signal level indicator (green @ -5 dBu, Red @ +22 dBu).
There are two inputs per channel. One has +48 volt phantom power supplied to it (when phantom power is switched on) and its signal passes through very high quality capacitors to block the phantom power DC voltage from the input stage of the preamplifier. The other input is connected directly to the input of the preamplifier, bypassing the phantom power blocking capacitors. You can use this “direct coupled” input when you are using a microphone that does not require phantom power, such as vacuum tube mics, ribbon mics, and dynamic mics. You can only use one of these inputs at a time. Do not connect anything to the unused input. Input and Output connectors are XLR-3 wired pin #2 hot.
The front panel mounted bicolor LED will light green when an output signal level of –5 dBu or greater is present, and this LED will turn red when the output signal level reaches +22 dBu. This is approximately 3-4 dB before output clipping on the 2 channel preamp."

$1995 direct from Forsell Technologies

AEA KU4 Unidirectional Ribbon Microphone

The KU4 is AEA's interpretation of the legendary RCA KU3A, which is now a collector's item and regarded as one of the best ribbon mics ever. (The KU3A was originally made by RCA for the movie studios and less than 600 were made. It is known to have a very wide smooth response). The supercardiod pattern of the KU4 helps to reduce room reflections and the lack of proximity induced bass boost makes it a perfect choice for close miking.


• Supercardioid pattern for excellent rear rejection

• Reduced proximity effect

• Smooth, high-bandwidth frequency response

• Authentic New Old Stock RCA ribbon material

• High-quality anodized & nickel-plated finish

• Custom AEA transformer, neodymium magnets

• Consistent Quality

• Field-tech replaceable ribbon assembly

• Hand-crafted in Pasadena, California


Operating Principle: Velocity microphone
  •  Frequency Response: Below 30 Hz to above 20 kHz 
  •  Maximum SPL: 140 + dB SPL above 200Hz for 1% third harmonic 
  •  Output Sensitivity: 2.8 mV/Pa into unloaded circuit 
  •  Output Impedance: 300 Ω nominal 
  •  Recommended Load: 1.2 KΩ or greater 
  •  Phantom power: Not required or recommended 
  •  Polarity: Pin 2 high for positive pressure at the front of the microphone. 
  •  Connector: XLR-3M wired to a 1.5 meter captive cable 

Off Axis Response:
  •  Polar Pattern: Supercardioid 
  •  Relative Output at 180° (dB): -12 
  •  Angle of Maximum Rejection: 135° 

Transducer element
  •  Ribbon Thickness: 1.8 microns ( .0000018 meter ) of pure aluminum 
  •  Ribbon Width: 0.082” (2.1 mm) 
  •  Ribbon Length: 1.25” (28.6 mm) 

  •  Included: Custom storage/shipping case, stand adapter, manual and attached 1.5 meter microphone cable