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Old 13th May 2011, 01:48 PM   #11
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Quote:
Originally Posted by wktk_smile View Post
Is the Custom Ordered Crystek clock somthing special in comparison with the ones we can buy from Digi-key?
Well other than that you can't order it from Digi-key?

It has slightly better specs yes.
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Old 13th May 2011, 01:54 PM   #12
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Thanks, Russ

BIII is difinitely better, because they looks pretty beautiful with
tridents
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Old 13th May 2011, 01:59 PM   #13
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Originally Posted by wktk_smile View Post
Thanks, Russ

BIII is difinitely better, because they looks pretty beautiful with
tridents
Well this is one reason we really like the new design. On Buffalo II many people are opting for Trident and so it made sense to keep the critical regulators on Buffalo III modular so that we are not wasting board space. The only regulator that is fixed to the board is the controller's regulator.
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Old 13th May 2011, 03:50 PM   #14
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Very interesting.

Here is a firmware request: can you make a way to connect boards so they use a common digital volume control in an active 2/3 way crossover setup? Ideally this would allow the use of an existing Buffalo for one of the output stages. Can the onboard DSP be used for programmable filters? I am personally thinking of dual or mono subs and high-passed mains, but flexibility would be nice.
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Old 13th May 2011, 04:34 PM   #15
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Using the loadable filter capabilities of the Sabre32 chip has been one of my wishes. The easy part is to load the filters. The hard part is to come up with the coefficients for the filters. Even though it has been said that there are insufficient taps for a crossover type filter, I find it hard to believe that you cannot create a slow roll off filter, similar to the current one but at an earlier cut off, say 1 KHz. So simple crossover functionality should be possible inside the DAC. ESS hinted an an application for generating the coefficients, but nothing is publicly known about that App.

Maybe Russ will create such an app and give it to us :-)

BIII doesn't have a DSP, just a microprocessor for programming the registers and loading filters if one exists.

For arbitrary volume control, say control BII in stereo and BII in Dual Stereo (making 6 channels) will require custom firmware. It is not so much about "connecting" the boards but working with the address limitations for I2C (BII and BIII can only support two addresses) and register programming.
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Old 13th May 2011, 04:42 PM   #16
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Default Cool

Russ. Can the controller be configured for an easy way to select the digital filter slopes via an offboard switch? I am also wondering if TPA might offer a simple display/control board which could display volume level (in dB), filter choice, and input choice, perhaps with a single rotary encoder (with push function to select between volume/filter/input).
I am now going amp direct, and am using the (dithered) volume control in Pure Music specifically because it represents volume level in dB.
Love the fact that you isolated the controller with its own reg-no compromise.
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Old 13th May 2011, 05:21 PM   #17
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Quote:
Originally Posted by barrows View Post
Russ. Can the controller be configured for an easy way to select the digital filter slopes via an offboard switch? I am also wondering if TPA might offer a simple display/control board which could display volume level (in dB), filter choice, and input choice, perhaps with a single rotary encoder (with push function to select between volume/filter/input).
I am now going amp direct, and am using the (dithered) volume control in Pure Music specifically because it represents volume level in dB.
Love the fact that you isolated the controller with its own reg-no compromise.
AC2 can easily do what you want. Its just a matter of tweaking the app firmware.

The current version of the on-board controller allows the adjustment you asked for. Filter slope etc. Including choosing modulator schemes and such.

I will share more details on that later.

Cheers!
Russ
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Old 13th May 2011, 06:16 PM   #18
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How hard would it be to pair the digital board from this project:

Open-source USB interface: Audio Widget

with the BIII as a DAC?
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Old 13th May 2011, 09:43 PM   #19
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probably not hard at all.
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Old 13th May 2011, 09:56 PM   #20
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What are the dimensions of the Buffalo III ?
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