HSA-1b Headphone and Speaker Amp


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Power Up with a Free Cable

Get a free 4-foot Blue Dragon Cable with the purchase of any qualifying Amp or Power Conditioner.

Cable automatically added to cart with eligible items. Limited time only. Restrictions apply.

Blue Dragon Power Cable

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

  • Outputs: Drive the SR1, traditional headphones, or speakers.
  • Inputs: Unbalanced, Single-Ended RCA. True-Balanced, XLR.
  • Precision 24-step attenuator for rock-solid left/right balance at all listening levels.

What's in the box?

  • HSA-1b Amplifier
  • Power Cable
  • Adapter for low-efficiency headphones


Load impedance: 0.3ohm – infinity on headphone output connectors.
Output power (one channel driven): 10W/8Ω, 20W/4Ω, 40W/2Ω
55W/1Ω @ 1kHz/sine wave
Frequency Response: 100mv/ in/sin. 15Hz – 500kHz
Power bandwidth: 100kHz (-3db) at 1W
Distortion: < 0.5% at 1kHz
Signal to noise: better than 90db
Input impedance: 40k Ω
Sensitivity: 0.5V /40k Ω
Input connectors: INPUT 1- 2 RCA, INPUT 2 - 2 XLR 3pin (female)
Output connectors: 1 x XLR 4-pin male (true-ribbon headphones)
1x XLR 4pin – female and 6.3mm stereo jack (conventional headphones) 20 - 600Ω
Max power consumption: 150W, without signal 25W
Working voltage: 115V/230VAC (selector switch) /
100V (requires internal connection)
Dimensions: Height 90mm, Width 218mm, Depth 320mm / Height 3.54 in, Width 8.58 in, Depth 12.60 in
Weight net: 5.3kg / 11.70 lbs.

*Limited Warranty Terms

RAAL-requisite warrants its products to be free from defects in material and workmanship under normal use and service for a period of five (5) years from the date of delivery. This warranty is only made to the original purchaser and is not transferable.

In the event of failure of a product under this warranty, RAAL-requisite will repair, at no charge, the product returned to its factory. RAAL-requisite may, at its option, replace the product in lieu of repair. If the failure has been caused by misuse, neglect, accident or abnormal operating conditions, repairs will be billed at the normal shop rate. In such cases, an estimate will be submitted before work is started, if requested by the customer.


This warranty does not cover:

  1. normal wear and tear or normal aging of the product;
  2. cosmetic damage, including but not limited to scratches and dents;
  3. damage through accident, abuse, neglect, misuse, natural events, or other external causes;
  4. damage through misapplication, overloading, or improper usage;
  5. damage due to improper maintenance and repair;
  6. damage as a result from the shipping and handling by third parties; or
  7. product alterations.



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