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Old 22nd July 2017, 01:46 PM   #1
pmchoong is offline pmchoong  Malaysia
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Default 2 ivy iii for B3

Hi, can I use 2 ivy iii boards for a single B3 dac? What are the benefits of doing so and how it is done? Thank you.
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Old 25th July 2017, 04:00 PM   #2
pmchoong is offline pmchoong  Malaysia
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Default BIII with 2 Ivy III

Is it possible to connect the BIII with 2 IVY III like these?

1) with 2 parallels outputs
2) with 1 output but from 2 IVY outputs
3) parallel power supply from Placid
Attached Images
File Type: png B3 with 2 IVY.png (323.7 KB, 216 views)
File Type: png B3 with 2 IVY_output_1.png (344.6 KB, 206 views)
File Type: png Placid to IVY3.png (265.7 KB, 201 views)
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Old 3rd August 2017, 08:48 PM   #3
BrianDonegan is offline BrianDonegan  United States
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2 ivy iii for B3
1) Yes
2) Maybe, but I would not
3) Yes

Also note, the four-channel S/PDIF module and Sidecar. Those are designed for the 8-channel Buffalo-III.

It would be better to use the 4:1 Mux module for multiple S/PDIF sources for the BIIIse. Switching between S/PDIF and I2S is handled on the DAC using the IP_S header.
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Old 16th August 2017, 05:14 PM   #4
pmchoong is offline pmchoong  Malaysia
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Thanks, Brian.

I am using the Buffalo-III with the four-channelS/PDIF module and the Sidecar. The Sidecar is not connecting to any input but is chained to the 4-channel/S/PDIF module. It is there for future expansion.

Right now I have connected both the IVY3 to the B-III to the same channel as per the drawing.

The problems I encounter :

1) Noise distortion from both speakers. I noticed that the output from the left channel is measured at 0.46V as compared to the 77.5mV from the right channel.

2) CD Transport signal dropping every 5 to 10 seconds. I am using the shigaclone and it has no problem with another DAC. The B-III has no problem with my media player.

3) First one second of signal is lost - eg. for some songs, the first second opening of the song is missing. The BIII just locked in a second late. (This issue is already there before I install the second board.)

Do I need to set any jumpers on the B-III or set the switch position?

Appreciate any suggestions and help.
Thank you.
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File Type: png B3 with 2 IVY.png (116.0 KB, 148 views)
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Old 17th August 2017, 11:36 AM   #5
pmchoong is offline pmchoong  Malaysia
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It looks like all my SE signals and Gnd are connected.
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Old 24th August 2017, 04:58 PM   #6
BrianDonegan is offline BrianDonegan  United States
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2 ivy iii for B3
Yes, all your SE signals will share a common ground.

Why do you want to use two IVY boards in parallel with the same signals?
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Old 24th August 2017, 05:09 PM   #7
pmchoong is offline pmchoong  Malaysia
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Hi Brian, no, I'm not using 2 IVY's to drive the output in parallel. I am not sure if it will work so I drop that idea. I'm driving 4 pairs of outputs from the 2 IVYs as drawn in the first diagram on the above post.

When one IVY is used, there's no distortion but signal drop from cd transport still occurs. When 2 IVYs are stacked up as shown in the drawing above, the distortion sets in. Do I need to connect the other IVY to another channel on the B-III board?

I do not know why is the very first half to one second lock onto the cd transport's signal is lost and also the dropped signals every 5 to 10 seconds.

Thanks.

Last edited by pmchoong; 24th August 2017 at 05:17 PM.
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Old 25th August 2017, 12:31 PM   #8
BrianDonegan is offline BrianDonegan  United States
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2 ivy iii for B3
When you connect to IVYs to a single pair of outputs, you are having the available current to each output stage. This is one factor in the distortion.

The additional current draw is likely also causing the dropouts.

I think you would be better off with a single IVY. You should have no problem driving multiple outputs from a single pair of IVY outputs.
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Old 27th August 2017, 03:43 PM   #9
pmchoong is offline pmchoong  Malaysia
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Hi Brian,

I am connecting it to a different channel. Do I need to increase the current on the both Placid HD and BP for the IVYs and also the B-III?
Attached Images
File Type: png B3 with 2 IVY_b.png (135.4 KB, 84 views)

Last edited by pmchoong; 27th August 2017 at 03:45 PM.
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Old 28th August 2017, 01:26 PM   #10
BrianDonegan is offline BrianDonegan  United States
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2 ivy iii for B3
You can check this by measuring the shunt current on the Placids while playing. You will want it to stay above 50mA when under load.
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