Pre-owned Raal Requisite HSA-1b

Headphone & Speaker Amplifier

• Direct drive amplifier for True-Ribbon Earfield Monitor, Dynamic, and Planar Magnetic headphones.
• Switch Drive – Drive the SR1a, conventional headphones, or speakers
• Precision 24-step attenuator for rock-solid left/right balance

Specifications

• Load Impedance

  0.3 Ohm – infinity

• Output Power

  10W /8Ω, 20W/4Ω, 40W/2Ω, 55W/1Ω @ 1khz/sine

• Ribbon Headphones Drive

  1 x RAAL-requisite SR-1a, 1 x Balanced Headphones (Dynamic & Planar)

• Freq. Response

  100mv/ in/sin. 15hz – 500kHz

• Power Bandwidth

  < 0.5% at 1khz

• Signal to Noise Ratio

  Better than 90dB

• Input Impedance

  40 kOhm

• Sensitivity

  0.5V/40kOhm

• Input

  Unbalanced RCA, Balanced XLR

• Output

  1/4” TRS, XLR, Ribbon, 4mm banana-plugs

• Output Impedance

  5.3 ohms

• Power (via conventional 1/4” TRS and 4-pin XLR):

  250mW into 32 ohms/26 mW into 300 ohms.

• Power (“Ribbon” SR1a Output via 4-pin XLR Balanced Adapter)

  1900mW into 32 ohms/200mw into 300 ohms.