k 2496
At 09:16 2005-11-24, you wrote:
>At 9:50 PM +0100 11/23/05, Klas Strandberg wrote:
> >Of course, I share everything with you...
> >
> >He has a design which is completely stable at 100 kHz
>
>Hmm,.. is the "100kKZ" the switching frequency of the power supply?
>The Rolls PB224 apparently "utilizes a proprietary high frequency
>power supply to greatly reduce noise,"
The importance is not the switching freq. but that it is stable.
Klas.
> >(or whatever choose) any circumstances and can therefore never
> >become audible.They can be made portable, running from a 9 volt
> >battery. Big as a cig pack.
>
>Running on 9 volts would do it and an external DC input too. Still,
>its impressive that the Sound Devices MP2/Mic Pre uses 3 volts for 2+
>hours powering of phantom and pre.
>
> >
> >I will ask if he can think of producing a number of such power supplies =
and
> >the cost. Let me guess that he wants at least 2-3 times as much as a Rol=
ls.
>
>Thanks for asking. Might be some hard core folks willing to do this.
>
>Logically, if the Rolls is contributing noise, it can't be much if
>the 722's pre/phantom performance is considered near the best (based
>on consistent comparison tests). And, if the Rolls is adding noise,
>the HiMD pre becomes even more impressive. Rob D.
>
>
> >
> >Klas.
> >
> >At 04:16 2005-11-23, you wrote:
> >>Does the phantom power supply he's designed produce less noise? Are
> >>you free to tell us more? Is it portable? What operating voltage? Rob
> >>D.
> >>
> >> =3D =3D =3D =3D
> >>
> >>At 9:15 PM +0100 11/22/05, Klas Strandberg wrote:
> >> >According to my friend it is more or less by chance all the time if=
> a power
> >> >device works or not. He sais that all modern IC-circuit for the purp=
ose
> >> >have a tendency to drift away in frequency. In his experience only
> one of
> >> >them work under all circumstances, stable and pure. In his opinion, =
the
> >> >Rolls is a very conventional and thereby unreliable device. ... if i=
t
> >> >works, it works... kind of.
> >> >
> >> >Klas.
> >> >
> >> >At 19:43 2005-11-22, you wrote:
> >> >>One would think that a good phantom circuit would be easy to includ=
e
> >> >>like a good mic pre, but the demands might be at odds with small si=
ze
> >> >>and the low DC voltages involved. The 722 and 744 had phantom issue=
s
> >> >>all the way through beta testing and they're ~11 volts and up. Ther=
e
> >> >>are quite a few audio interfaces/pres that the run on AC wall warts
> >> >>apparently because of phantom powering demands. Len Moskowitz cited
> >> >>likely problems with the MT24/96's phantom when he first laid eyes =
on
> >> >>it. Are there other ~3-4 volt DC voltage devices that have good
> >> >>phantom circuit performance besides the Sound Devices MP2 and MixPr=
e?
> >> >>Rob D
> >> >>
> >> >>At 6:18 PM +0100 11/22/05, Klas Strandberg wrote:
> >> >> >Yes, I will appreciate that! It makes it a much better recorder.
> >> >> >Thanks Oryoki!
> >> >> >I just wish they had a better phantom power supply installed.
> >>Might come
> >> >> >with the next model.
> >> >> >
> >> >> >Klas.
> >> >> >
> >> >> >At 16:14 2005-11-22, you wrote:
> >> >> >>M-Audio has released a firmware update for
> >> >> >>the Microtrack 2496.
> >> >> >>
> >> >> >>Klas, you'll appreciate these two fixes:
> >> >> >>
> >> >> >>1. The level meters now work in REC/PAUSE mode.
> >> >> >>
> >> >> >>2. When recording from mic or line inputs, the
> >> >> >>headphone monitor now works in REC/PAUSE as well
> >> >> >>as REC mode.
> >> >> >>
> >> >> >>Before rushing out to buy this $350 machine,
> >> >> >>nature recordists should take note of its low
> >> >> >>record levels relative to the Sony Hi-MD
> >> >> >>recorder. This is demonstrated in message
> >> >> >>20599 posted by Rob D. Thanks again, Rob!
> >> >> >>
> >> >> >>--oryoki
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>"Microphones are not ears,
> >> >> >>Loudspeakers are not birds,
> >> >> >>A listening room is not nature."
> >> >> >>Klas Strandberg
> >> >> >>Yahoo! Groups Links
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >
> >> >> >Telinga Microphones, Botarbo,
> >> >> >S-748 96 Tobo, Sweden.
> >> >> >Phone & fax int + 295 310 01
> >> >> >email:
> > > >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> >"Microphones are not ears,
> >> >> >Loudspeakers are not birds,
> >> >> >A listening room is not nature."
> >> >> >Klas Strandberg
> >> >> >Yahoo! Groups Links
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >>
> >> >>
> >> >>--
> >> >>Rob Danielson
> >> >>Film Department
> >> >>University of Wisconsin-Milwaukee
> >> >>
> >> >>
> >> >>
> >> >>"Microphones are not ears,
> >> >>Loudspeakers are not birds,
> >> >>A listening room is not nature."
> >> >>Klas Strandberg
> >> >>Yahoo! Groups Links
> >> >>
> >> >>
> >> >>
> >> >>
> >> >
> >> >Telinga Microphones, Botarbo,
> >> >S-748 96 Tobo, Sweden.
> >> >Phone & fax int + 295 310 01
> >> >email:
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >"Microphones are not ears,
> >> >Loudspeakers are not birds,
> >> >A listening room is not nature."
> >> >Klas Strandberg
> >> >Yahoo! Groups Links
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >>--
> >>Rob Danielson
> >>Film Department
> >>University of Wisconsin-Milwaukee
> >>
> >>
> >>
> >>"Microphones are not ears,
> >>Loudspeakers are not birds,
> >>A listening room is not nature."
> >>Klas Strandberg
> >>Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >
> >Telinga Microphones, Botarbo,
> >S-748 96 Tobo, Sweden.
> >Phone & fax int + 295 310 01
> >email:
> >
> >
> >
> >
> >
> >"Microphones are not ears,
> >Loudspeakers are not birds,
> >A listening room is not nature."
> >Klas Strandberg
> >Yahoo! Groups Links
> >
> >
> >
> >
>
>
>--
>Rob Danielson
>Film Department
>University of Wisconsin-Milwaukee
>
>[Non-text portions of this message have been removed]
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
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