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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 11th February 2019, 12:17 PM   #41
ds23man is offline ds23man  Netherlands
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You can do some more checks if you do some new measurements in the second channel and see if the error is constant.
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Old 11th February 2019, 12:20 PM   #42
ds23man is offline ds23man  Netherlands
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Quote:
Originally Posted by cowanaudio View Post
Any chance you can share the model of Behringer you have proved works well?

I bought the 2i2 just to do speaker testing with HFD and am pretty disappointed that it will introduce random timing errors.
UMC22 | Interfaces | Computer Audio | Behringer | Categories | MUSIC Tribe
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Old 11th February 2019, 12:59 PM   #43
00940 is offline 00940  Belgium
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I played a bit more with this, at 96khz, waiting a few minutes between measurements, redoing only one channel. The error is either small (about 10s delay) or absolutely 0 (perfect overlap of the impulses).
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Old 11th February 2019, 02:53 PM   #44
ds23man is offline ds23man  Netherlands
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You can check if it gets better with the ASIO4all driver. Remind that 10uS is a 3,44mm offset.
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Old 11th February 2019, 03:26 PM   #45
00940 is offline 00940  Belgium
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Asio4all gives me the same behavior. Somewhat random results, either no delay or a 10s one. That's weird. I also noticed that HFD will output completely off results if I click to soon on "sum" after taking a measurement.

I wish HFD provided the option to autocalibrate in real time by using a loopback on a second channel. Iirc, there was a logiciel (not a freeware) that did that but the name escapes me.
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Old 11th February 2019, 04:16 PM   #46
ds23man is offline ds23man  Netherlands
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Did some testing with the Behringer. Did it with a DLCP file, practical 6 channels.

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Old 13th February 2019, 07:17 AM   #47
colinyal is offline colinyal
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Hi Danner, Nice work. There is an error on HFD User Guide regarding LR filters which you have copied. LR2 filter has Q=0.5, an LR4 filter also has Q=0.5 and is made by adding 2 Second Order filters with Q=0.7 (butterworth). Hypex have acknowledged the error but not corrected it yet.

Ref: Linkwitz–Riley filter - Wikipedia


LR filters with time aligned drivers is a great way to start with most speakers in my opinion.
Regards
Colin
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Old 13th February 2019, 10:56 AM   #48
cowanaudio is offline cowanaudio  Australia
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Setting up a Fusion Amp 3-way Step-by-Step
Thanks!
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Old 13th February 2019, 05:20 PM   #49
Ianmac is offline Ianmac  Scotland
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Been away from base for a few days so will have to catch up with the all the info on setting up the Fusion amps / speakers. Many thanks to all for their input.

I unfortunately have recently purchased a Focusrite 2i2 and a mike pre amp totally unaware of the technical issues that produce timing errors. A waste of money making the fusion project more expensive.

I also have more work to do on the environment I have to use to correctly align the filter to a 3 way loudspeaker. How can existing users have completed this other than in Free space or an Anechoic chamber ? How do you get rid of reflections ?

I have still to look at the full tech spec of the fusion system to try and evaluate the performance of the DAC and at least compare the parameters against my current DAC.
I am also concerned about the A to D conversion of any analogue signals and what effect that may have on signal quality. I use a lot of vinyl as source material from a high quality system.

My reaction to my position is to wait until @ ds23man produces his official line up procedure in the next few months and make sure I am comfortable with my areas of concern before ordering an amp unit.

Last edited by Ianmac; 13th February 2019 at 05:22 PM. Reason: spelling error
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