How to link several BuffaloIII volume control ? - diyAudio
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Old 20th February 2014, 05:47 PM   #1
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Default How to link several BuffaloIII volume control ?

Hi there everyone,

So, I need your help with something that seems was not discussed before here as it's bit of a particular case to say the least.

I'm setting up a surround system in which each monitor (2 way SEOS12 + AE TD12M) has it's own stereo Buffalo III (se), each driver powered by an NCore amplifier. Loudspeaker crossovers will be managed by a dedicated computer with RME AES I/O cards (one AES pair per monitor) running IR's done with RePhase (so XO's + amplitude and phase correction).

I will offset each driver level and delay inside the host but I want to take the advantage and convenience of the high quality digital volume control built-in the ESS9018 DAC. If I recall correctly it's done over 32bit, the DSP being 48bit.

Now what I want to do as said in the title of this thread is to control volume on several Buffalo III at the same time.

To look at it another way, what I must do is control simultaneously and remotely several motorized pots, as volume control on the Buffalo DAC is done via a potmeter. (ADC connector)

What I've think about so far is controlling the motorized potentiometers by programming an Arduino microcontroller and buffer the output to the "x" number of pots I need to control. I don't think I need one microcontroller per motorpot, do I ? I also want to be able to program some reference listening levels so a microcontroller seems to be the only way to go.

Other thoughts : in place of a motorized potmeter which may be imprecise (but again, I will offset each driver level on the host computer) or has tracking inconsictancies over time, what do you think of using instead a resistor network like the Joshua Tree ? Such device has 128 steps (can it work with 0.5dB steps ?), can be remote controllable and has a mute function.

Not as easy as wiring a motor pot but what I want to do is far from easy !


I would really appreciate any help or ideas on that particular matter !

Cheers,
Stephane.
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Old 20th February 2014, 07:54 PM   #2
LeonvB is offline LeonvB  Netherlands
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Just control the volume of the BIII(SE)s with a microcontroller. You just need a controller with multiple I2C busses to hook up all of the boards and set the volume by software.
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