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HR-101-S Compact XLR Microphone Amplifier  Stereo Line Level Mixer by Hall Research

HR-101-S Compact XLR Microphone Amplifier Stereo Line Level Mixer by Hall Research

In stock (50 items available)
The HR-101-S from Hall Research is a premium quality, conservative and expert standardized mic amplifier with stereo line-level blend that can be utilized as a solitary gadget, or matched with the HR-101-R. This highly professional unit is useful for extending quality sound over long separations on fiber optic links.
  • Brand
    Hall Research
  • SKU
  • Weight
    1.00 lbs
  • Warranty
    3 Years
  • Condition
  • Status
    In Stock
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  • $375.25
Market price: $395.00, you save $19.75
  • 5% less

The HR-101-S is a compact and professional grade microphone amplifier with stereo line-level mix that can be used as a stand-alone device, or paired with the HR-101-R to extend audio over long distances on fiber optic cables. The HR-101-S provides a balanced mic input on an XLR connector as well as a stereo line level input on 3.5mm mini-stereo jack.

The unit has an adjustable-gain low noise mic preamp with a gain range of +34 to +54 db (or x50 to x500) and provides indication of volume level on digital VU meter on its front panel (to prevent saturation and clipping due to too much gain). The unit accommodates a wide range of microphone types. Phantom power can be inserted by means of a front panel switch. The stereo line input is on a standard 3.5mm (1/8 inch) connector which gets mixed with the amplified microphone signal.

In a typical application a presenter can hookup the audio from their PC to the line input and plug the mic to the XLR. The unit will mix the speakers voice with the PC audio. The HR-101-S has both stereo analog (on 3.5mm) and SPDIF digital (on RCA) outputs as well as a fiber-optic ST connector for driving long cables to 3,280 ft. to compatible receiver.


  • MIC preamp input
  • Stereo line level audio input
  • Local analog stereo line level and digital SPDIF audio outputs
  • Adjustable gain for MIC preamp input
  • VU meter to indicate MIC preamp gain
  • Phantom power to accommodate a wide range of MIC inputs
  • Safety interlock does not turn on high-power fiber LED drivers unless fiber-optic cable is plugged in at both ends
  • Green design, turns off parts of circuit when they are not in use
  • Compact, Rugged, Reliable, and Economical
  • Made in USA
  • Audio Inputs: 1x 3.5mm analog line level stereo, 1x XLR microphone
  • Audio Outputs: 1x 3.5mm stereo analog , 1x RCA SPDIF Digital
  • MIC in Impedance: 6.8 Kohm
  • Mic Phantom Power: 15vDC (note that most mics rated for 48v accept range of 12~48 vDC, with some 9~52 vDC)
  • Mic Amplifier Noise: 1.3nV/vHz RFI at 1KHz
  • Mic CMR: 100 dB min
  • Audio Bandwidth: 3 Hz to 30 KHz
  • Optical Wavelength: 840 nm GaAIAs LED
  • Optical Cable: Simplex (only 1 fiber) Multi-Mode. OM2 or OM3
  • Temperature: Operating: 32 to 122°F (0 to 50°C); Storage: –40 to + 185°F (–40 to +85°C)
  • Enclosure: Aluminum and Steel
  • MTBF: 90,000 hours (calculated estimate)
  • Power: 5V DC, 2.6A (actual consumption less than 0.25A)
  • Size: 1.64''H x 4.18''W x 5.08''D (4.2x10.6x12.9 cm)
  • Weight: 0.65 pounds (0.295 kg)


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Our main goal is to ensure your complete satisfaction with our service and products. If, for any reason, you are not 100% satisfied with your purchase, you can return it within 30 days of the purchase date for a full refund. Our 30-day money back guarantee applies to all of the products we sell, except for: TVs and monitors 20" and larger, Special Order merchandise, or any item indicated as non-returnable. Shipping is not refundable. Prior to returning your purchase, a Return Merchandise Authorization (RMA) number will be provided to you.

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If the item was sent back to us for an exchange, please allow 3 - 5 business days for the replacement to be processed.

No Returns/Exchanges on the following:

TVs and monitors 20" and larger
Special Order merchandise
Any item indicated on the website as non-returnable

For more information see our official Return Policy

  • Shipping Info
    We offer free ground shipping on every purchase of $300 and more for US and US territory. We deliver worldwide.
  • Payment Methods

  • Return Policy
    We Offer a 30-Day Money Back Guarantee