IVY plus 2.1 active differential filter?

reactivepower · 4th November 2010, 05:03 PM

I am not sure if this has been asked before, but I would be very interested in a 2.1 filter board to connect to IVY III. An active LR4 filter at 80Hz would be ideal. I have amps with XLR balanced inputs. A volumite on the buffalo for volume control, and a 2.1 output from a filter board, would eliminate the requirement for a preamplifier. Has this been considered?

I am curious about the Volumite though when used with the Sabre DAC. Is the digital volume done in 32 bits format regardless of the input bit format? Has anyone seen the Sabre datasheet that could answer this question?

Thanks in advance.

stephen1212 · 15th November 2010, 08:06 PM

D. Clickless, Very High Resolution Volume control
The firmware presents a 0.5dB volume control register to the
user allowing setting of volume to 0.5dB accuracy. However,
internally the volume control operates to less than 1/64 of a dB
and smoothly moves from one requested volume to the next.
This results in a perfectly click-less volume step.

48 bit math

reactivepower · 16th November 2010, 12:26 AM

Is this an excerpt from the datasheet?

BrianDonegan · 16th November 2010, 12:34 AM

Quote:

Originally Posted by reactivepower

Is this an excerpt from the datasheet?

http://www.esstech.com/PDF/sabrewp.pdf

reactivepower · 16th November 2010, 04:45 AM

Thanks Brian. I had skimmed that paper before, but had missed or forgotten that section.

Hmm, no comment regarding the 2.1 output... Has this been considered? I could make a filter board myself I suppose, but if I were to use the OPA1632 I would have to get some adapter boards to use the SOIC chip.

BrianDonegan · 16th November 2010, 10:43 AM

PM sent

4th November 2010, 05:03 PM	#1
reactivepower diyAudio Member Join Date: Jul 2007	IVY plus 2.1 active differential filter? I am not sure if this has been asked before, but I would be very interested in a 2.1 filter board to connect to IVY III. An active LR4 filter at 80Hz would be ideal. I have amps with XLR balanced inputs. A volumite on the buffalo for volume control, and a 2.1 output from a filter board, would eliminate the requirement for a preamplifier. Has this been considered? I am curious about the Volumite though when used with the Sabre DAC. Is the digital volume done in 32 bits format regardless of the input bit format? Has anyone seen the Sabre datasheet that could answer this question? Thanks in advance.

16th November 2010, 10:43 AM	#6
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	PM sent __________________ Twisted Pear Audio

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15th November 2010, 08:06 PM	#2
stephen1212 diyAudio Member Join Date: Mar 2007	D. Clickless, Very High Resolution Volume control The firmware presents a 0.5dB volume control register to the user allowing setting of volume to 0.5dB accuracy. However, internally the volume control operates to less than 1/64 of a dB and smoothly moves from one requested volume to the next. This results in a perfectly click-less volume step. 48 bit math

16th November 2010, 12:26 AM	#3
reactivepower diyAudio Member Join Date: Jul 2007	Is this an excerpt from the datasheet?

16th November 2010, 04:45 AM	#5
reactivepower diyAudio Member Join Date: Jul 2007	Thanks Brian. I had skimmed that paper before, but had missed or forgotten that section. Hmm, no comment regarding the 2.1 output... Has this been considered? I could make a filter board myself I suppose, but if I were to use the OPA1632 I would have to get some adapter boards to use the SOIC chip.

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