Har skrudd litt dsp og det var et sjumilssteg. Og det er enda mer å gå på. Har ikke brukt Roomperfect, kun skrudd manuelt i Lyngdorfs dsp modul.
Her er noen viktige påminnelser fra Bruno P som kanskje skaper debatt men som jeg synes er gode poenger:
The conclusion is a good one: Don’t make on-axis corrections, without referencing the off-axis response, or you will just end up inadvertently generating more SPL anomalies in the off-axis and power response.
Here are two pages of conclusions that follow this on- and off-axis discussion.
Observations:
• Heavy correction exacerbates acoustic problems.
• Steep, linear-phase filtering causes pre-ringing in off-axis response.
• Linear-phase target response invites pre-echos. (Editor’s note: This is good advice from a man who has a world-class command of digital electronics.)
>Brute-force correction produces ugly, smeared sound.
Sensible approach to correction:
• Don’t shave off the hair. It’ll grow back. (Editor’s note: This refers to correction on-axis behavior that changes off-axis)
• Limit scope of correction to a few periods
>The subtler the correction, the wider the listening angle in which it still makes some sense. (Editor’s note: In contradiction to these missives, you can find powered studio monitors that have been DSP corrected to within an inch of their lives to get a less than ±1dB on-axis response!)
And last, the final two pages of conclusions:
Even better approach to correction: manually!
• Forget FIR. (Editor’s note: for those of you who think your loudspeaker sounds better using FIR filters to zero out the anechoic phase... maybe rethink that after reading this:
Zero-phase In Studio Monitors)
• Of each bump and trough, find cause. (Editor’s note: fix the speaker in the transducer engineering development phase first rather than relying on DSP to fix a bad driver design.)
• If the driver is the source: correct ruthlessly. (Editor’s note: Bruno means doing appropriate transducer engineering first so the driver doesn’t need so much DSP correction.)
• If the source is elsewhere: EQ gently.
• Know your acoustics.
Vance Dickason pauses his Outboard DSP review series for some thoughts about what he has been finding out. The series of reviews started in July 2024 and already included five outboard DSP processors. All measured quite well and would be appropriate for any loudspeaker project in any application...
audioxpress.com