# Which HQP Filter are you using? \[2024\]

**URL:** <https://community.roonlabs.com/t/which-hqp-filter-are-you-using-2024/261032>\
**Category:** HQ Player\
**Created:** [January 1, 2024, 4:44pm UTC](https://community.roonlabs.com/t/which-hqp-filter-are-you-using-2024/261032 "2024-01-01T16:44:43Z")\
**Posts on this page:** 1\
**Showing post:** 257

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**Author:** ![jussi\_laako](https://community.roonlabs.com/letter_avatar/jussi_laako/32/5_5575768a8748004e209b776fc1b2916d.png) [@jussi\_laako](https://community.roonlabs.com/u/jussi_laako)\
**Post date:** [April 19, 2024, 11:55am UTC](https://community.roonlabs.com/t/which-hqp-filter-are-you-using-2024/261032/257 "2024-04-19T11:55:23Z")

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One of the aspects that affects how the filter sounds is shape of the roll-off.

For example poly-sinc-ext2:  
 ![ext2](https://roon-community-uploads.s3.amazonaws.com/original/4X/e/3/1/e315e9e4094baea7fb6a5ebba0ac8c66867eb41e.png)

And poly-sinc-gauss-long:  
 ![glong](https://roon-community-uploads.s3.amazonaws.com/original/4X/8/7/b/87be67fe6452411dc2303bff99b8f52ebbf3606a.png)

Both are flat to 20 kHz, both reach pretty much same attenuation by 22.05k and both have same length.

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