RAAL-requisite HSA-1b | Headphone & Speaker Amplifier

Regular price $4,500.00

Our Take

If you love the SR1a, but want more of the incredible soundstage and vivid imaging, and more of the neutral, realistic delivery, the HSA-1b gives you just that.


Read the full review.

From RAAL-requisite

The HSA-1b is a the perfect pair for the RAAL-requisite SR1a, but it can also be used to drive speakers and a wide variety of other headphones.

Headphone & Speaker Amplifier

Direct drive amplifier for True-Ribbon Earfield Monitor headphones, speakers, conventional dynamic, and planar magnetic headphones.

RAAL-requisite HSA-1b

Input Options

Unbalanced, Single-Ended RCA. True-Balanced, XLR.

RAAL-requisite HSA-1b

24 Step Attenuator.

Precision 24-step attenuator for rock-solid left/right balance at all listening levels.

RAAL-requisite HSA-1b SR-1a


Load Impedance: 0.3 Ohm – infinity
Output Power (one chanel driven): 10W /8Ω, 20W/4Ω, 40W/2Ω, 55W/1Ω @ 1khz/sine
Ribbon & Headphones Drive: RAAL-requisite SR-1a, Dynamic & Planar Magnetic
Speaker Drive: 8Ω, 4Ω, & 2Ω Loads
Freq. Response: 100mv/ in/sin. 15hz – 500kHz
Power Bandwidth: 100kHz (-3db) at 1khz
Distortion: < 0,5% at 1khz
Signal to Noise Ratio: Better than 90dB
Input Impedance: 40 kOhm
Sensitivity: 0,5V /40kOhm
Input: IN1- 2 RCA, IN2 – 2 XLR
Max Power Consumption: 150W , without signal 25W
Dimensions: H 90, W 218, D 320mm (3.54 x 8.58 x 12.60 inches)
Weight: 5,3kg (11.68 pounds)
Price: $4,500 USD
Optional: Waterproof Flight Case w/Handle & Casters $350 USD
Selectable Mains Volatge: 115/230V (100V available for Japan)

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