Questions for Arny Krueger re: Delta 1010 Tests

[[email protected]]

Hi Arny:

I've been to your site, pcavtech.com, and have seen your tests results
on the Delta 1010. I've been testing my Delta 1010 myself using RMAA
5.5 in loopback tests, but my test results are coming out way poorer
than yours. Is this due to the different version of RMAA that I'm
using -- 5.5 -- probably it is more stringent in its scoring?

What I really wanted to know in these tests is whether the use of a
high quality external clock source (Mytek Stereo96 ADC) improves the
performance of my 1010. So I compared loopback tests of using the
internal clock vs S/PDIF sync vs word clock sync at 44.1K, 48K and
96K:

http://home.ca.rr.com/mtl777/RMAA%20Tests/Delta%201010%20Loopback/Comparison%2044K/Comparison%2044K.htm

http://home.ca.rr.com/mtl777/RMAA%20Tests/Delta%201010%20Loopback/Comparison%2048K/Comparison%2048K.htm

http://home.ca.rr.com/mtl777/RMAA%20Tests/Delta%201010%20Loopback/Comparison%2096K/Comparison%2096K.htm

I also posted this question at:

http://forum.rightmark.org/topic.cgi?id=4:920

However, the results do not show much differences. Someone posting at
the RightMark forum was of the opinion that a loopback test is not
really adequate to show differences, but I'm not an expert to tell
whether that's true or not. What do you think? I'm seeing that you
are using mostly loopback tests in your soundcard comparisons, so I
tend to disbelieve what that poster said.

BTW, what do you think of the quality of the SPDIF input of the 1010?
Is it accurate? How accurate is it? I'm recording the digital output
of my Mytek ADC into the 1010 via SPDIF and am wondering if I'm
getting accurate transfers.

Lastly, I guess you already know about the issue of the Delta 1010 not
being able to sync properly to an external clock at 44.1K sample rate
using BNC word clock connection (my 44.1K test results bear this
out). Someone said this is due to a defect in the "clock management
circuit." Where is this circuit located -- in the PCI card or in the
break-out box?

Your reply, or anyone else who would like to chime in with their
ideas, would be greatly appreciated.

Thanks a lot! :-)

[Arny Krueger]

> wrote in message
oups.com
> Hi Arny:
>
> I've been to your site, pcavtech.com, and have seen your
> tests results on the Delta 1010. I've been testing my
> Delta 1010 myself using RMAA
> 5.5 in loopback tests, but my test results are coming out
> way poorer than yours. Is this due to the different
> version of RMAA that I'm using -- 5.5 -- probably it is
> more stringent in its scoring?

I don't think so. RMA hasn't changed that much.

> What I really wanted to know in these tests is whether
> the use of a high quality external clock source (Mytek
> Stereo96 ADC) improves the performance of my 1010. So I
> compared loopback tests of using the internal clock vs
> S/PDIF sync vs word clock sync at 44.1K, 48K and 96K:
>
> http://home.ca.rr.com/mtl777/RMAA%20Tests/Delta%201010%20Loopback/Comparison%2044K/Comparison%2044K.htm
>
> http://home.ca.rr.com/mtl777/RMAA%20Tests/Delta%201010%20Loopback/Comparison%2048K/Comparison%2048K.htm
>
> http://home.ca.rr.com/mtl777/RMAA%20Tests/Delta%201010%20Loopback/Comparison%2096K/Comparison%2096K.htm
>
> I also posted this question at:
>
> http://forum.rightmark.org/topic.cgi?id=4:920

Did you run your tests with the switches set to +4 or -10?

Your results look like -10 was set.

> BTW, what do you think of the quality of the SPDIF input
> of the 1010? Is it accurate?

IME yes.

> How accurate is it?

Bit perfect.

> I'm recording the digital output of my Mytek ADC into the
> 1010 via SPDIF and am wondering if I'm getting accurate
> transfers.

Typically, the results will be grotesquely horrible because you have
clocking problems, or they will be as good as the source. Sounds like you're
not having any severe problems, so you are good.

> Lastly, I guess you already know about the issue of the
> Delta 1010 not being able to sync properly to an external
> clock at 44.1K sample rate using BNC word clock
> connection (my 44.1K test results bear this out).
> Someone said this is due to a defect in the "clock
> management circuit." Where is this circuit located -- in
> the PCI card or in the break-out box?

Good question - I've heard of the problem but never investigated it. My
Delta 1010 is located at a remote site, so I don't mess with it very much.

[JBorg, Jr[_2_]]

> wrote:
>
>
>
>
>
> Hi Arny:
>
> I've been to your site, pcavtech.com,





> Someone said this is due to a defect in the "clock management
> circuit." Where is this circuit located -- in the PCI card or in the
> break-out box?


No, the defect isn't due to that.

The defect is and was can still be found inside the head of
Arnie Krueger.




> Your reply, or anyone else who would like to chime in with their
> ideas, would be greatly appreciated.
>
> Thanks a lot! :-)


No sweat.