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Amiga 1000 Audio Filter Disable Hack - AmigaLove
https://www.amigalove.com/viewtopic.php?t=1558
The filter cutoff frequency is right around 3.5KHz, and the response is fairly linear in the passband, with a drop to about -3 db at 10 Hz. The stopband response drops off sharply with a slope of about -30 db per octave. This filter produces an output with bass and midrange, but not much in the high end.
Audio filter mod - English Amiga Board
https://eab.abime.net/showthread.php?t=86880
Hi all, I've been wanting to modify hardware audio filter from my Amiga 600 due to lacking highs when playing music. Amiga 1200 does not have this problem due to higher cut off frequency and I was planning to mod Amiga 600 and rise cutoff frequency to Amiga 1200 levels.
Amiga audio filters (Page 2) — Amiga — FPGA Arcade
http://www.fpgaarcade.com/punbb/viewtopic.php?id=442&p=2
Registered: 2013-08-07. Posts: 812. Re: Amiga audio filters. Yes, no problem at all if you prefer "an analogue way", we can just try to "digitize" what you did on the Replay if you give it a chance - that's the idea of the Replay platform. As long as the design to replicate stays linear it is rather easy to do.
Get 14-bit Audio On Every Amiga Guide - Amitopia
https://amitopia.com/get-14-bit-audio-on-every-amiga-guide/
The Amiga chipset has two analog lowpass filters after the DAC. The stronger one with an effective frequency is set at around 7 kHz. This is also called the “LED filter” in some places and this can be switched off. The second RC lowpass filter is fixed.
Amiga Vampire V4 and the Audio Filter LED - YouTube
https://www.youtube.com/watch?v=rG1z7VqjscQ
Yes, the V4 also has a Audio Filter LED :o)
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