Yahoo Groups archive

Doepfer

Index last updated: 2026-04-29 00:15 UTC

Message

AW: [Doepfer_a100] A-125 phaser (noise issue)

2008-02-25 by hardware@doepfer.de

> but i still would like to know if there is an adjustment to be
> made that will help with the noise...
>
> thanks,
> rg

There is no way to adjust the noise. The noise is caused by the working
principle of the A-125: six-stage all pass filter (= phase shifter) made
with FETs (field effect transistors) as variable resistors. All phasers
based on this principle have nearly the same noise floor (e.g. the M-172
from Rolands System 100M). But if you use the max. audio signal level (i.e.
before clipping occurs) and put the final VCA/VCF (if there is one in your
patch) post the phaser the remaining noise should be not an issue.

Best wishes
Dieter Doepfer

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.