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Username: staemius

Post Number: 20
Registered: 12-2004
Posted on Wednesday, February 09, 2005 - 9:27 am:   Edit Post

Haven't found any definitive advice regarding adjusting the tone filter pots (Electrum in particular but really any). Is there a 'philosophy' behind what occurs when you turn the filter clockwise vs counter-clockwise. How does this alter the sound? I know - I'll fiddle with mine and 'see what I get'- but looking for something more specific before I start experimenting. Peace!
Advanced Member
Username: lbpesq

Post Number: 318
Registered: 7-2004
Posted on Wednesday, February 09, 2005 - 9:57 am:   Edit Post


The Alembic filter is a "low pass" filter. This means that it allows frequencies below the point at which it is set to pass through, while those frequencies above this point are filtered out. In practice, you will find that even very slight adjustment of the filter yields a myriad of tones. If you add a "Q" switch to this set-up the Q boosts the signal at the cut-off frequency. Hope this helps. If you look around the site, or do a search on "low pass filter" I'm sure you can find lots of info on this subject as it often comes up for discussion.

Bill, tgo
Advanced Member
Username: bob

Post Number: 367
Registered: 11-2002
Posted on Wednesday, February 09, 2005 - 11:13 am:   Edit Post

Fully clockwise (wide open), the filter pass frequency is set to 6 kHz, which will essentially let everything useful come through. As you start turning counter-clockwise, you gradually lose high frequencies, with the signal being reduced by 12 dB per octave above the pass frequency. The center position is roughly 1.3-1.4 kHz, and at fully counter-clockwise, everything above 350 Hz is being reduced (approximately the fundamental frequency of an F played on the first fret of the high E string with standard guitar tuning).

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