BrianGT 3886 Monoblocks too quiet!

raypalmer · 9th October 2009, 03:56 AM

Well I've got them built and working properly but for the fact that they output far, far, far too quietly

What's the most common cause of this?

MJL21193 · 9th October 2009, 04:23 AM

Incorrect gain maybe, check resistor values.

Not enough input signal voltage - what is the source?

Redshift187 · 9th October 2009, 11:26 AM

Could the mute be enabled? That would be about whisper quiet.

Ted205 · 9th October 2009, 12:14 PM

have you checked the gain with a scope ?

wintermute · 9th October 2009, 12:26 PM

Quote:

Originally Posted by Redshift187

Could the mute be enabled? That would be about whisper quiet.

I think this is a good suggestion. There should be a resistor between V- and pin 8 to disable the mute. It is not a case of the switch connects the v- via said resistor to mute the circuit, the circuit is muted by removing the voltage on pin 8. So if you thought you didn't need a mute circuit and left it out then that is probably the problem

Tony.

AndrewT · 9th October 2009, 01:03 PM

it's a Brian GT PCB. It should have all the necessary components on it.
But does it?
Where is the link to the required checking info?

raypalmer · 05:02 PM

Double checked the five resistors on the board check out....

I'm using a passive pre amp...

Puffin · 9th October 2009, 04:56 PM

If you have difficulty reading the bands on the resistors, the easiest way is to check their values with a multimeter.

peranders · 9th October 2009, 05:31 PM

Quote:

Originally Posted by raypalmer

Double checked the five resistors on the board check out....

I'm using a passive pre amp...

Try to exclude it and connect directly to you signal source.

raypalmer · 9th October 2009, 09:52 PM

Okay so directly off my TV it's loud as heck.

But my passive works great with my LM3875? Is there such a huge gain difference??

9th October 2009, 03:56 AM	#1
raypalmer diyAudio Member Join Date: Dec 2008 Location: Burlington	BrianGT 3886 Monoblocks too quiet! Well I've got them built and working properly but for the fact that they output far, far, far too quietly What's the most common cause of this? __________________ Wherever you go there you are.

9th October 2009, 11:26 AM	#3
Redshift187 diyAudio Member Join Date: Aug 2008	Could the mute be enabled? That would be about whisper quiet. __________________ Tyler

9th October 2009, 04:52 PM	#7
raypalmer diyAudio Member Join Date: Dec 2008 Location: Burlington	Double checked the five resistors on the board check out.... I'm using a passive pre amp... __________________ Wherever you go there you are. Last edited by raypalmer; 9th October 2009 at 05:02 PM.

9th October 2009, 09:52 PM	#10
raypalmer diyAudio Member Join Date: Dec 2008 Location: Burlington	Okay so directly off my TV it's loud as heck. But my passive works great with my LM3875? Is there such a huge gain difference?? __________________ Wherever you go there you are.

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9th October 2009, 04:23 AM	#2
MJL21193 Account disabled at member's request Join Date: Mar 2007	Incorrect gain maybe, check resistor values. Not enough input signal voltage - what is the source?

9th October 2009, 12:14 PM	#4
Ted205 diyAudio Member Join Date: Jun 2008	have you checked the gain with a scope ?

9th October 2009, 01:03 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	it's a Brian GT PCB. It should have all the necessary components on it. But does it? Where is the link to the required checking info?

9th October 2009, 04:56 PM	#8
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	If you have difficulty reading the bands on the resistors, the easiest way is to check their values with a multimeter.

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