replacing two position phase switch with pot?

crippledchicken · 15th June 2005, 03:50 AM

i have a sub plate amp with the 0-180 slide phase switch. i'd like to replace it with a variable pot would this be possible? and if so what type of pot would i need to use? thanks, crippledchicken

amplifierguru · 15th June 2005, 06:26 AM

chook,

the phase switch is to correct for polarity inversion - if your sub connection is compressing when it should be rareifying i.e. an instant comparison for which is right judged by ear.

You're somewhere in between? Not that there's anything wrong with that.

Greg

richie00boy · 15th June 2005, 07:11 AM

It's impossible to do with the existing circuitry. All the switch does is select between an inverted and normal signal. I'd leave it alone as most variable phase circuits cause phase shift that varies with frequency and it is more likely to make the sound worse IMO.

crippledchicken · 15th June 2005, 01:41 PM

glad i asked first, thanks guys! crippledchicken

15th June 2005, 03:50 AM	#1
crippledchicken diyAudio Member Join Date: Dec 2003 Location: south east mo.	replacing two position phase switch with pot? i have a sub plate amp with the 0-180 slide phase switch. i'd like to replace it with a variable pot would this be possible? and if so what type of pot would i need to use? thanks, crippledchicken

15th June 2005, 07:11 AM	#3
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	It's impossible to do with the existing circuitry. All the switch does is select between an inverted and normal signal. I'd leave it alone as most variable phase circuits cause phase shift that varies with frequency and it is more likely to make the sound worse IMO. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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15th June 2005, 06:26 AM	#2
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	chook, the phase switch is to correct for polarity inversion - if your sub connection is compressing when it should be rareifying i.e. an instant comparison for which is right judged by ear. You're somewhere in between? Not that there's anything wrong with that. Greg

15th June 2005, 01:41 PM	#4
crippledchicken diyAudio Member Join Date: Dec 2003 Location: south east mo.	glad i asked first, thanks guys! crippledchicken

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