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Class D Switching Power Amplifiers and Power D/A conversion

Setting up a Fusion Amp 3-way Step-by-Step
Setting up a Fusion Amp 3-way Step-by-Step
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Old 25th March 2019, 07:32 AM   #51
_henry_ is offline _henry_  Australia
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Originally Posted by ds23man View Post
When you make measurements in HFD you also register the offset of the drivers. To do this correctly you need exact timing between the input and output. This only garanteed with a usb souncard/mic preamp which share the same clock. If you use an Umik, this relation does not exist and the simulated responces will be wrong.


Whats the connection will look like?
Fusion - usb - laptop
UMC22 - usb - laptop
UMC22 - analog into fusion

Is this correct?
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Old 25th March 2019, 09:24 AM   #52
ds23man is offline ds23man  Netherlands
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Yes.
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Old 28th March 2019, 04:23 PM   #53
_henry_ is offline _henry_  Australia
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Originally Posted by ds23man View Post
Yes.


Im getting very low volume on fusion 253, set the output at 125w, 50w and 50w. Gain at 0, UM22 at max volume and it didnt have enough volume to get good measurements. Any ideas?

I tested the um22 on audirvana and it gives normal volume.
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Old 28th March 2019, 04:28 PM   #54
_henry_ is offline _henry_  Australia
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I also tested the fusion with my speakers on audirvana (playing music on the midrange), it gives plenty of output...
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Old 28th March 2019, 06:26 PM   #55
mspijker is offline mspijker  Canada
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The UM22 outputs max 0 dBu (0.775 V), see https://www.strumentimusicali.net/ma...SERIES_ENG.pdf .

The Fusion amp needs 18 dBu (6.15 V) on the XLR input and 9 dBu (2.18V) on the RCA input for full power. If you're using the XLR inputs, you can try using the RCA inputs or increase the Fusion amp gain with the jumper described on page 17 of the manual. It looks like you'll need to do both (RCA @ 2dBu / 0.98V) if you want more power from the fusion amp. Or use a preamp.

Last edited by mspijker; 28th March 2019 at 06:33 PM.
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Old 28th March 2019, 11:34 PM   #56
_henry_ is offline _henry_  Australia
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Originally Posted by mspijker View Post
The UM22 outputs max 0 dBu (0.775 V), see https://www.strumentimusicali.net/ma...SERIES_ENG.pdf .

The Fusion amp needs 18 dBu (6.15 V) on the XLR input and 9 dBu (2.18V) on the RCA input for full power. If you're using the XLR inputs, you can try using the RCA inputs or increase the Fusion amp gain with the jumper described on page 17 of the manual. It looks like you'll need to do both (RCA @ 2dBu / 0.98V) if you want more power from the fusion amp. Or use a preamp.

Thanks mspijker, i only have gain problem while measuring with HFD.

I got sufficient gain with normal playback though. Im wondering whats the problem here.
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Old 29th March 2019, 12:50 AM   #57
mspijker is offline mspijker  Canada
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Henry, I just ordered a pair of FA123s and a UMC22 but they haven't arrived yet. So I'm not writing from experience, just reading specs. How did you hook up the UM22 to the Fusion amps? What connection do you use for normal playback? Maybe ds23man has some good tips wrt HFD.
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Old 29th March 2019, 04:01 AM   #58
_henry_ is offline _henry_  Australia
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Originally Posted by mspijker View Post
Henry, I just ordered a pair of FA123s and a UMC22 but they haven't arrived yet. So I'm not writing from experience, just reading specs. How did you hook up the UM22 to the Fusion amps? What connection do you use for normal playback? Maybe ds23man has some good tips wrt HFD.

Laptop - usb - UM22
Um22 - XLR - Fusion
Laptop - usb - Fusion

Normal playback is
Laptop - usb - um22
Um22 - xlr - fusion
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Old 29th March 2019, 07:09 AM   #59
_henry_ is offline _henry_  Australia
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Originally Posted by _henry_ View Post
Laptop - usb - UM22
Um22 - XLR - Fusion
Laptop - usb - Fusion

Normal playback is
Laptop - usb - um22
Um22 - xlr - fusion


Normal playback is with audirvana in mac
Hfd on windows7 in parallel wit asio4all
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Old 30th March 2019, 03:38 AM   #60
_henry_ is offline _henry_  Australia
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The problem went away, not sure what was the issue....
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