I would like to incorporate a balance Control in my BIII Setup, I have read a bit about DIY balance controls on the Elliot sound website but need a bit of advice on; what ohm pot should be used at the output of the Ivy3 to achieve the balance control & not upset the impedance between the Ivy & my Linkwitz Active analog crossover.

I was probably going to try the setup shown in Figure 5 http://sound.westhost.com/project01.htm but leaving out he volume pot.

Just for clarification, even though I am using Arduino to control my system I have not removed your firmware chip so I am doing everything externally.

My thoughts where to take a similar approach to the one I have used for the volume, whereby I would install a motorized 4 channel pot, use 2 channels for the balance & 1 channel for the Arduino to read the location of the balance control, then display it on the screen somehow. The pot would be controlled via the remote.

If there is a digital way to do a similar thing I am all ears, or should that be eye's.

Brian

Any thoughts

Do you have a dual mono setup? If so, that you can use the arduino to set the volume of each DAC independently from each other. This would require you to remove the firmware.

Another solution is to use a two channel digital potentiometer controlled by your Arduino, but I don't know how much this would degrade the signal integrity.

Interesting! Can this be achieved with the master trim you mentioned a few years ago at diyaudio?

http://www.diyaudio.com/...8-a-126.html#post1707811

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Edited by user Saturday, December 29, 2012 8:51:46 AM(UTC)  | Reason: typo

How stupid of me . The answer is often much simpler as one expects. Thanks!

You have to remove the firmware chip and use a external controller (Arduino or other) to achieve balance control. A slightly modified version of HiFiDUINO will work very well.

I had a quick look, please correct me if I am wrong, below is the VOID setup for adjusting the volume.

void setSabreVolume(byte regVal)
{
writeSabreReg(0, regVal); // set up volume in DAC1
writeSabreReg(1, regVal); // set up volume in DAC2
writeSabreReg(2, regVal); // set up volume in DAC3
writeSabreReg(3, regVal); // set up volume in DAC4
writeSabreReg(4, regVal); // set up volume in DAC5
writeSabreReg(5, regVal); // set up volume in DAC6
writeSabreReg(6, regVal); // set up volume in DAC7
writeSabreReg(7, regVal); // set up volume in DAC8
}

I assume what I would do to get the balance is add something like this;

void setSabreBalance(byte regVal)
{
writeSabreReg(0, regVal); // set up volume in DAC1
writeSabreReg(1, regVal); // set up volume in DAC2
writeSabreReg(2, regVal); // set up volume in DAC3
writeSabreReg(3, regVal); // set up volume in DAC4
}

PS: I haven't checked the actual DAC channels, but my theory would be that I only needed to make one side (say left channel in stereo mode) adjustable to achieve a balance control.

Thanks Corpius.

I have been forgetful though, when I originally posted this question it was for my, & I guess still is for my, first Arduino BIII build, which will not have the firmware removed :)

This solution will work beautifully for the new BIII SE Arduino build, but that doesn't solve the original question. I'm thinking I may have to abandon the balance control idea for DQ BIII No1 :)