RAAL Requisite SR1a FilterSet

US $ 200.00

The SR1a FIR filter pack contains three separate high-resolution FIR eq filtersets:

FilterSet 1 = neutral
FilterSet 2 = neutral plus bass extension
FilterSet 3 = neutral plus bass and treble extension

Each filterset contains filters with sample rates from 44.1 kHz to 352.8 kHz and packaged as a .zip file that can be used in most convolvers, like Hang Loose Convolver and Roon for example. Mono 352.8 kHz mono filters are also included for HQPlayer.

FilterSet Free Trial Offer: Download the Hang Loose Convolver 14-Day Free Trial software. Specify the SR1a FIR Filter Pack in the Order Notes at checkout.

Full Product Description

Frequency Response Measurement & Correction

RAAL requisite SR1a frequency

The RAAL requisite SR1a headphone has a bass bump from 50 to 125 Hz, a mild dip in the lower midrange and mostly flat to about 800 Hz. Above 800 Hz there is a rise in frequency response with a +4 dB peak in our ears most sensitive range (~2.1 kHz) giving the headphone a decidedly bright “in your ear” upper midrange characteristic.

Engaging the high-resolution convolution filter produces a ruler flat response, eliminating the “in your ear” upper midrange peak resulting in a neutral sound. The soundstage and depth of field is increased with the lead vocals and instruments “sitting in the pocket” of the mix instead of dominating it.

Additional Info

Please note that the SR-1b headphone will work with these filtersets. Please be sure to have baffle step compensation turned on when using these filters.


Bernardo M. C: “One word: WOW! These are excellent! A game changer. I was using the ASR PEQ previously and it is definitely no match for your filters. Truly amazing work on your part, you just managed to make my favorite listening setup even better!”

Alain N’s experience: “After 10 hours of music, I can says that your convolution filters for SR1A are completely unbelievable!”
Burak P: “Your filter is such a gem in audiophile arena :) This kind of DSP processing is future of sound.”

Chris Connaker, Audiophile Style article including detailed measurements: “Taking the RAAL-requisite SR1a Headphones To Another Level


Raal Requisite SR1a headphones

Raal Requisite Calibration Service

Raal Requisite headphone calibration


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