How long will a LM3886 drive???

Leolabs · 10th July 2008, 02:08 AM

Lets say a LM3886 NIGC is used to drive a pair of long running cable to a speaker,then what's the max length before things run into trouble???

gni · 10th July 2008, 03:29 AM

There is going to be power loss in the resistance of the conductor.
There is going to be loss of control over the cone movement.

es44 · 10th July 2008, 03:32 AM

I guess it depends on the square of the cable. The "fatter" the cable, the longer the distance.

eketehe · 10th July 2008, 06:00 AM

How long you need?
Ps: its not ok to separate l/r chanel too long,no stage,just 2 independent sound.

Duo · 10th July 2008, 06:09 AM

This depends on the setup of the output circuitry on the amplifier.

If you have no Zobel network and/or no decoupling inductor, you may run into oscillation as the speaker leads get longer.

The inductor in series (often in parallel with a resistor about 10ohms) that you see in many SS amplifiers is there to decouple the speaker lead capacitance from the feedback circuit to prevent oscillation.

The Zobel network helps greatly in this respect and in some others as well.

As long as the output filter is set up properly, you can drive very long cables without any trouble. The only problem you begin to run into is power loss, but it takes extremely long cabling before that is noticeable.

YFW · 10th July 2008, 06:23 AM

Theoretically,the lengh or impedance of speaker wire should be as short as possible to prevent power loss or oscillation.
I have tried 30m before and work fine.

AndrewT · 10th July 2008, 07:59 AM

fit the power amp near the speaker and use long interconnects.

sakis · 13th July 2008, 06:24 PM

100 VOLT TECHNOLOGY then ...your speakers will go kilometers away if needed

10th July 2008, 02:08 AM	#1
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	How long will a LM3886 drive??? Lets say a LM3886 NIGC is used to drive a pair of long running cable to a speaker,then what's the max length before things run into trouble???

13th July 2008, 06:24 PM	#8
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	OR USE .... 100 VOLT TECHNOLOGY then ...your speakers will go kilometers away if needed __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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10th July 2008, 03:29 AM	#2
gni diyAudio Member Join Date: Sep 2006	There is going to be power loss in the resistance of the conductor. There is going to be loss of control over the cone movement.

10th July 2008, 03:32 AM	#3
es44 diyAudio Member Join Date: Apr 2005 Location: Fredericia, DK	I guess it depends on the square of the cable. The "fatter" the cable, the longer the distance.

10th July 2008, 06:00 AM	#4
eketehe diyAudio Member Join Date: Nov 2007	How long you need? Ps: its not ok to separate l/r chanel too long,no stage,just 2 independent sound.

10th July 2008, 06:09 AM	#5
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	This depends on the setup of the output circuitry on the amplifier. If you have no Zobel network and/or no decoupling inductor, you may run into oscillation as the speaker leads get longer. The inductor in series (often in parallel with a resistor about 10ohms) that you see in many SS amplifiers is there to decouple the speaker lead capacitance from the feedback circuit to prevent oscillation. The Zobel network helps greatly in this respect and in some others as well. As long as the output filter is set up properly, you can drive very long cables without any trouble. The only problem you begin to run into is power loss, but it takes extremely long cabling before that is noticeable.

10th July 2008, 06:23 AM	#6
YFW Account Disabled Join Date: Jun 2007	Theoretically,the lengh or impedance of speaker wire should be as short as possible to prevent power loss or oscillation. I have tried 30m before and work fine.

10th July 2008, 07:59 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	fit the power amp near the speaker and use long interconnects.