stk ics

shon35us · 18th January 2011, 01:12 PM

I wondering if it possible to have a BTL output on STK412-110, STK4231II, OR STK412-130 at 4 ohms? Has any one tried this, the datasheet didn't say weather or not it can run in BTL mode or 4 ohms

pacificblue · 20th January 2011, 07:18 PM

Most of the older STKs are designed for 8 Ohm operation. In BTL configuration they see half the load. A 4 Ohm speaker will appear as a 2 Ohm load to each of the ICs. You can make up for the lower impedance by reducing the rail voltage, but that reduces the available output power accordingly and makes the BTL effort absurd.

With a 4 Ohm load it appears more promising to use two channels in parallel, if for some obscure reason the power of a single channel should be insufficient.

18th January 2011, 01:12 PM	#1
shon35us diyAudio Member Join Date: Oct 2005	stk ics I wondering if it possible to have a BTL output on STK412-110, STK4231II, OR STK412-130 at 4 ohms? Has any one tried this, the datasheet didn't say weather or not it can run in BTL mode or 4 ohms

20th January 2011, 07:18 PM	#2
pacificblue diyAudio Member Join Date: May 2008	Most of the older STKs are designed for 8 Ohm operation. In BTL configuration they see half the load. A 4 Ohm speaker will appear as a 2 Ohm load to each of the ICs. You can make up for the lower impedance by reducing the rail voltage, but that reduces the available output power accordingly and makes the BTL effort absurd. With a 4 Ohm load it appears more promising to use two channels in parallel, if for some obscure reason the power of a single channel should be insufficient. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

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