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Old 25th January 2006, 10:16 PM   #1
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
Default Crossover Question

I need a 12/db oct xover at 1900hz. Well this is simple enough
but I may be driving it from an amplifier with a 12 ohm output
impedience. Would this high output impedience change the calculations.

Thanks
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Old 26th January 2006, 08:36 AM   #2
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
put simply YES, it will alter the crossover.

Is that 12ohm, the output impedance or the required load impedance for that output stage?

12ohm output impedance is extremely high for a power amplifier, even for a valve amplifier with a transformer coupled output.

Many a preamp has an output impedance down around that 12ohm level. These are specifically designed for driving long cables/high capacitance into the higher impedance load of the next amplifying stage.

To answer the question; we cannot tell because you have not specified the two load impedances on the other side of the crossover.
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regards Andrew T.
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Old 26th January 2006, 11:41 AM   #3
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
Andrew, thanks for the reply. I was thinking about a small
OTL amp built without feedback which explains the high output
impedience. The drivers I intend to use will be 8 ohms after
the zobel circuite is added. On the other hand if I use my SOZ
the output impedience will be 4 ohms. Won`t this call for yet
different component values ?
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Old 26th January 2006, 11:53 AM   #4
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

you've got more problems than the c/o.

Amplifier source impedances of 4R and 12R will totally change
the bass alignment of the speaker they are connected to.

/sreten.
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