DCA Expanse FilterSet

US $ 225.00

The DCA Expanse FIR filterset pack contains two separate high-resolution FIR eq filtersets:

FilterSet 1 = neutral
FilterSet 2 = neutral plus 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 DCA Expanse FIR Filter Pack in the Order Notes at checkout.

Full Product Description

Frequency Response Measurement & Correction

DCA Expanse frequency response Red measured Green corrected

Looking at the measured frequency response, the bass is -2 dB down at 20 Hz, with a -3 dB dip between 200 and 300 Hz, another -2 dB dip in the 800 Hz to 2 kHz range and a +2 dB peak in the 3 kHz to 4 kHz range and narrow +2 dB peak at 5.5 kHz. The “W” frequency response gives the headphone an “upper midrange forward” tonal response that masks the true neutral capability of these headphones.

Engaging the high-resolution convolution filter transforms these headphones into an accurate sound reproducer with a ruler flat frequency response that extends from 15 Hz to 4 kHz +- 0.25 dB and +-0.5 dB to 6 kHz. With the 100 Hz “bump” tamed and response flat to 15 Hz, the headphone sounds like it has gained another octave of low frequency response. The high precision linearity of the corrected frequency response means that the tone quality and soundstage is accurately reproduced from the source media. The neutral plus high frequency extension filter takes advantage of the smoothness of the driver to produce a more intimate presentation.


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