Hi John,
On the first listen, I couldn't hear a big difference until the last
recording. It seemed to get quieter and softer to my ears there, at least
until that crow said hello :^) On subsequent listens I discerned a subtle
and gradual addition of hiss/noise as the PB224 was taken out of the
equation. Gradual enough that I missed it in my not so sound proof pc cafe
here in Korea. To me it sounds as if the PMD Rolls combination may add only
a slight bit of extra hiss/noise in contrast to the Rolls + MZ-707, but I
can't be positive. To me, this test shows consistency with Rob's test of
NT1A's + PB224 =3D Clean.
Kudos to you John for a fine test. I really like the clock for this kind o=
f
listening. Contrary to popular belief, Rob really does have a good idea onc=
e
in a while :^o
Best,
Mark R.
On 9/30/05, John Hartog <> wrote:
>
> So here are the results from the comparative tests I did last weekend
> with the Rolls PB224 phantom power supply. What did I find? That
> outdoors is not the place to get meaningful results, and it is likely
> impossible to compare the noise from the equipment used in this
> experiment because the wind, slight as it was, adds too much
> inconsistency. But have a listen, maybe there is something of worth
> to be taken from my efforts. Here are two of the same recording =96 one
> wav (10.8MB) and one mp3 (0.96MB:
>
> http://www.rockscallop.org/test/jh-050925-rollstest.wav
>
> http://www.rockscallop.org/test/jh-050925-rollstest.mp3
>
> The recording consists of six 10 second snips from my six test
> recordings. I used a ticking clock, kind of like Rob does in his
> tests. I taped the clock to a small alder tree, kind of like I
> imagine Rob might not do. For the first three recordings, the clock
> is about eight feet away and somewhat to the left of the microphones.
> In the second three, the clock is about three feet directly in front.
> All the recordings were made with recorder settings at full gain.
>
> The equipment used follows this order:
> 1. Rode NT1-A's > Rolls PB224 > Sony MZ-N707
> 2. NT1-A's > PB224 > Marantz PMD670
> 3. NT1-A's > PMD670
> 4. NT1-A's > PMD670
> 5. NT1-A's > PB224 > PMD670
> 6. NT1-A's > PB224 > MZ-N707
>
> Your questions and comments are welcome.
> -John Hartog
>
>
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