Parallel 3875 or single 3886 for low impedance speakers?

Groucho2004 · 16th July 2004, 09:59 PM

Hi,

I am planning to build a gainclone which should be able to drive my KEF Reference 2 speakers. These have a nominal impedance of 4 Ohms with a minimum of ~3 Ohms. So, would it be better to use 2 LM3875 in parallel or just 1 LM3886 chip? I read somewhere that the 3875 sounds better so maybe 2 of those are preferrable?

Thanks in advance for any advice.

Morbid · 16th July 2004, 10:49 PM

LM3886 and 3875 are almost the same.
you wont notice the sound between them...
the difference is that you have more parameters are connected legs in the 3886, the 3875 has only 6 (?) legs to operate... +/-/Gnd/Out/In+/In-

and the 3886 have also 2 Vcc and Mute feature....

its ok to use this chip for 4 ohm but you need to know the output u need and the voltage to use...
if u need 0-50Watts , one chip with good cooling will do.
if u need more than that you will start bridging amps or try to find bigger chips (STK!!!)

hope I helped

tlmadsen · 17th July 2004, 08:31 PM

Go for two or more LM3886 in parallel. With your low impedance speaker, you need current, not voltage.

See my replay at:

Can you tell me how to beef up PA100?

Have fun

Thomas

16th July 2004, 09:59 PM	#1
Groucho2004 diyAudio Member Join Date: Jul 2004 Location: Barcelona	Parallel 3875 or single 3886 for low impedance speakers? Hi, I am planning to build a gainclone which should be able to drive my KEF Reference 2 speakers. These have a nominal impedance of 4 Ohms with a minimum of ~3 Ohms. So, would it be better to use 2 LM3875 in parallel or just 1 LM3886 chip? I read somewhere that the 3875 sounds better so maybe 2 of those are preferrable? Thanks in advance for any advice.

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16th July 2004, 10:49 PM	#2
Morbid diyAudio Member Join Date: Jun 2004 Location: israel	LM3886 and 3875 are almost the same. you wont notice the sound between them... the difference is that you have more parameters are connected legs in the 3886, the 3875 has only 6 (?) legs to operate... +/-/Gnd/Out/In+/In- and the 3886 have also 2 Vcc and Mute feature.... its ok to use this chip for 4 ohm but you need to know the output u need and the voltage to use... if u need 0-50Watts , one chip with good cooling will do. if u need more than that you will start bridging amps or try to find bigger chips (STK!!!) hope I helped

17th July 2004, 08:31 PM	#3
tlmadsen diyAudio Member Join Date: Aug 2003 Location: Roskilde - The vikingships	Go for two or more LM3886 in parallel. With your low impedance speaker, you need current, not voltage. See my replay at: Can you tell me how to beef up PA100? Have fun Thomas

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