RAAL Requisite SR-1b FilterSet

(3 customer reviews)

US $ 200.00

The SR-1b FIR filterset pack contains two separate high-resolution FIR eq filtersets:

FilterSet 1 = neutral
FilterSet 2 = neutral plus bass 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 SR-1b FIR Filter Pack in the Order Notes at checkout.

Full Product Description

Frequency Response Measurement & Correction

The RAAL requisite SR-1b 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

Note that these convolution filters were developed without the external baffle step compensation. The baffle step compensation has been built into the convolution filter. Therefore, any head amp that is suitable to drive the Raal SR-1b can now be used.

These filters also work with the original SR-1a headphone. Please be sure to turn baffle step compensation off when using these filters.

3 reviews for RAAL Requisite SR-1b FilterSet

  1. Tony Stead

    An absolute must if you own these headphones, smooths out the sound beautifully and they sound just right, could never go back to listening without these filters, also can i say what excellent service i have received from Mitch. Highly recommended.

  2. Ed Wong (verified owner)

    I’ve been using the original SR-1a filters since they came out. Now I have the new interface for the Raal CA-1a which makes the SR-1a sound different then the original speaker conversion box.

    Without the filters listening to the Raals is like listening to a tornado of sounds, some of which grind you down. The tone of the Raals without Accurate Sound filters puts the emphasis on the upper mids and treble often with an exaggeration on the sibilances. Imagine using a Walkman with a chromium dioxide cassette tape – the Accurate Sound filters is like hitting the Dolby noise reduction button on well recorded material. The perception of dynamic range goes up, you can focus on the music, bass is brought up closer in line with the other frequencies. I don’t imagine that the timing of the frequencies can change but again, there is a perception that the difference tones are more congruent.

    The filter set is super easy to install and I use them with Roon. I am able to change the filters on the fly using any of my devices.

    If you are using world class headphones, the investment in the filter set is a must. The rawness of the Raals are tamed, the output feels completely organic, you can listen for hours without fatigue.

  3. BPE (verified owner)

    I tested these filters against Raal interface with OBC and against some PEQ filters I developed in Roon. Mitch’s filters are consistently better in my opinion, particularly the neutral one for acoustic music. They integrate well all frequencies and provide a natural sound signature, not fatiguing. Other curves may be more exciting but for complex, non amplified music I believe this is a great solution. Recommended.

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