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Studiospares HAR4 4-Way Rackmount Headphone Amp
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Studiospares HAR4 4-Way Rackmount Headphone Amp

Product Code: 449340

The Studiospares HAR4 is a professional 4 channel multifunctional Headphone Amplifier. Designed for the studio who needs performance and flexibility.

£87.00 (INC VAT)
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  • Description
  • Reviews

The Studiospares HAR4 is a professional 4 channel multifunctional Headphone Amplifier.
Designed for the studio who needs performance and flexibility.

The Input and Output levels are displayed on a 7 segment LED ladder enabling the HAR4 to easily interface with other equipment. The Main inputs are on the rear panel via XLRs and Jacks with linked Thru Outputs for daisy chaining. This Stereo signal becomes a stereo buss available to all four headphone channels.

Each of the four Headphone channels includes:- Switches for Left Mute and Right Mute and a Stereo/Dual Mono operation.
Controls are provided for Bass and Treble EQ, Output Volume and Mix facility between the main inputs and an Auxillary input.
Jack sockets for the Auxillary input and Headphone Output.
LEDs provide a visual indication of the Headphone Output Level.


Audio Inputs
Main Input XLR and 1/4” Jack connectors
Input impedance 40k ohm balance, 30kohm unbalanced
Maximum input level 16dBu balanced or unbalanced


AUX Input
Input impedance 5k ohm
Maximum input level 22dBu
Direct Input 1/4” Stereo Jack


Audio Output
Main Output XLR and 1/4” Jack Balanced
Phone Output 1/4” Stereo Jack


Headphone Amplifiers
Maximum power output +24dBm (load impedance 100 ohm) +21dBm (load impedance 8 ohm)
Minimum load per channel 8 ohm

System Specification
Frequence Response 10Hz to 150kHz ± 3dB
Noise 22Hz to 22kHz >90dB@ 0dBu
Dynamic Range 22Hz to 22kHz 110dB
Distortion (THD) 0.006% typically @+4dBu, 1kHz


Function Controls
Input Level Variable
Balance per Channel Mix between Aux and Main signals/balance between left and
right channel
Output level per chan Variable
Treble Cut off frequency 6kHz, Range ±12dB
Bass Cut off frequency 150Hz Range ±12dB


Function Switches
Stereo/2 Channel Switches between stereo mode and 2 channel mode
Left Mute Mutes the left signal of the respective channel
Right Mute Mutes the right signal of the respective channel


Input Level 7 segment LED display -30dB, -24dB, -18dB, -12dB, -6dB, 0dB, CLIP
Output Level 7 segment LED display -30dB, -24dB, -18dB, -12dB, -6dB, 0dB, CLIP


Power Supply
Mains Voltage 100-120VAC and 200-240VAC 50-60Hz
Mains Connection Standard IEC receptacle

Customer Reviews
  • Verified Customer
    on 20 October 2016
    Amazing product especially for the money. Having used several of these to power a headphone display wall in our shop I can say it is a great product. Never had an issues with noise and always getting a nice clean signal through. Been going for years and hopefully it'll keep going for a few more.
  • Verified Customer
    on 07 June 2016
    Unfortunately after owning this product for a number of years... it never gets used because it is too noisy. I have connected the outputs of my UR824 interface using 2x balanced jack -> XLR to the main input of the box, I have also connected my line outputs 2-8 from the back of UR824 to the Aux IN of headphones 2 to 4 to allow for different mixes per player. These are dual mono to stereo jack cables. However, compared to the outputs of the UR824 headphones, the main input, and the aux inputs to 2,3 and 4 are very noisy and full of ground loop noise. That digital sort of electric noise. I can't see why because in the same rack I also have an ADA8200 which is silent on it's outputs (I use it for my front and rear monitors). Also the sound feeding the UR824 is actually coming through an ADAT cable from my RME RayDat. So there's no physical analouge connection with the computer either. I've also used it on location through a different power source and the horrible noise floor remains. I only came back to post a review as I am looking for a replacement which will hopefully be less noisy. I use all Studiospares cables to connect the UR824 to the Headphone Amp. Sorry StudioSpares, you normally deliver the goods but this one just hasn't worked for me. I have to apologize each time I track more than 2 musicians.