Sony TA-N80ES impedance tweak, help!

genshiken · 17th January 2011, 02:49 PM

Hi,

According to Sony's manual running the amp in monoblock mode requires 8ohm speakers. That should be no problem for the most ppl, but mine are 4ohm power hungry kappa 100's and the blocks get really hot after an hour listening. The heat isnt a problem to solve if thats the only thing to get things stable for louder listening volumes and for longer times without blowing the amps. So I was wondering if anyone would help me out to tweak the amps impedance lower. Anybody have experience doing this?

jaycee · 17th January 2011, 05:33 PM

The problem is that there are not enough transistors in the output stage to safely cope with the current required for a 4 ohm load. You say your speakers are "power hungry" - this probably means that they quite often dip to 2 ohms.

Adding fans will help a bit, but it will not keep the output transistors safe, and they will eventually go bang.

genshiken · 18th January 2011, 01:19 PM

Quote:

Originally Posted by jaycee

The problem is that there are not enough transistors in the output stage to safely cope with the current required for a 4 ohm load. You say your speakers are "power hungry" - this probably means that they quite often dip to 2 ohms.

Adding fans will help a bit, but it will not keep the output transistors safe, and they will eventually go bang.

Is it possible to put extra output transistors parallel to existing ones?

tvi · 18th January 2011, 03:06 PM

might be better to mod the speaker/x-over?

rgds
jms

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17th January 2011, 05:33 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	The problem is that there are not enough transistors in the output stage to safely cope with the current required for a 4 ohm load. You say your speakers are "power hungry" - this probably means that they quite often dip to 2 ohms. Adding fans will help a bit, but it will not keep the output transistors safe, and they will eventually go bang.

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