Treble EQ Filter

About

Hauptwerk's audio engine applies a low-pass filter to prevent aliasing artifacts during playback. With the audio engine set to 48kHz, this filter removes a subtle but noticeable amount of high-frequency content from the final output — around 13dB by 20kHz. This Impulse Response filter is designed to restore the dampened treble by utilising the Impulse Response feature in Hauptwerk v5+.

With the audio engine set to 48kHz, polyphony is almost doubled compared to 96kHz — but at the expense of the artifact filter. This Impulse Response counteracts that, so will make 48kHz sound much more natural.

With the audio engine set to 96kHz, the effect is much more subtle — the rolloff begins at a higher frequency — so this filter is primarily aimed at 48kHz users. If you're running at 96kHz you may notice a very slight brightening.

Once installed, it appears in Hauptwerk's impulse responses list found on the mixer page. Apply it to each of your outputs at 100% wet. The included amplitude adjustment is pre-set so no manual level matching should be required. It is possible to combine this filter with other IR files if you use them, by loading one IR onto a Primary bus, and the other onto the Master Mix bus.

If the treble boost feels too excessive for a particular sample set, you can reduce the wet mix below 100% to apply the correction more gently.

Technical Information

• Software required: Hauptwerk v5+
• Recommended settings: Wet 100%, Level Adjust +6dB

Example

Above is an example of how an Impulse Response is applied in Hauptwerk. Select the 'Treble EQ Filter' from the list, and the default settings should be applied automatically. If it makes the organ sound any louder or quieter, you can change the 'Reverb wet level adjust (dB)' to match the same levels — but 6dB should be the same as default. To compare the results, change the percentage from 100% (full filter applied) to 0% (no effect).