Ultrasound DI Plus
DanielleOM
Who is using these or compared them to other preamps?
I like that if offers both a line and XLR output.
I see two manuals on their web site. It looks like they made two versions.
(with and without a phase switch)
http://www.ultrasoundamps.com/pdfs/DI-Plus-wPhase-Manual.pdf
http://www.ultrasoundamps.com/image-viewer-diplus.html
Danielle
Mike Brown
The Baggs PADI also has line and XLR outs and a phase switch, and that's
what I use with my K&K.
Mind you I haven't entirely got the hang of the EQ system yet, but it
still sounds good.
MJRB
Misifus
Most of the time, I can run my PADI flat. If I use any EQ, a little
goes a long way.
-Raf
--
Misifus-
Rafael Seibert
Photos: http://www.flickr.com/photos/rafiii
home: http://www.rafandsioux.com
Mike Brown
> Mike Brown wrote:
>
>> DanielleOM wrote:
>>
>>> Who is using these or compared them to other preamps?
>>>
>>> I like that if offers both a line and XLR output.
>>>
>>> I see two manuals on their web site. It looks like they made two
>>> versions. (with and without a phase switch)
>>>
>>>
>>>
>>>
>>> http://www.ultrasoundamps.com/pdfs/DI-Plus-wPhase-Manual.pdf
>>>
>>> http://www.ultrasoundamps.com/image-viewer-diplus.html
>>>
>>>
>>>
>>> Danielle
>>>
>>
>> The Baggs PADI also has line and XLR outs and a phase switch, and
>> that's what I use with my K&K.
>>
>> Mind you I haven't entirely got the hang of the EQ system yet, but it
>> still sounds good.
>>
>> MJRB
>
>
>
> Most of the time, I can run my PADI flat. If I use any EQ, a little
> goes a long way.
>
> -Raf
>
I think that the reason that I haven't really come to grips with the EQ
is that when I twiddle the "extensions" to the Notch or the Mid controls
I don't hear a heap of difference.
Some advice on the proper way to use them would help.
The phase inverter is very useful.
MJRB
George's Pro Sound Co.
"Mike Brown" <rock...@chariot.net.au> wrote in message
news:4b0f599c$1...@news.comindico.com.au...
understand what all the numbers mean
each note on your guitar(actually any instrument) can be described two ways
as a note ie A, D, E C or what ever
but they can more precisly be described by the number of cycles per
second(or Hertz "Hz") that make up the note
to simplify this I will speak directly about a acoustic guitar in standard
tuning from the lowest E to the high E at the 12th fret
this is three octaves
here is a chart that will tell you the Hz value to your notes
http://www.indiana.edu/~emusic/hertz.htm
we are concerned with the notes from Low E #28 on the chart which comes in
at 41.2 Hz
you first octave is to the E on the D string at 82.4 Hz
the second octave is to the open E on the thinnest string at 164.8 Hz
and the finaal octave for this discussion is the high E on the 12th fret of
the thin string at 329.6 Hz
so the fundementals of your guitar span the range from (rounded off) 41 to
330Hz
in that range is every note on your guitar from the Low E on the fat string
to the high E on the thin string at the 12th fret
That chart can help you match the Hz value to any note on your guitar
http://www.indiana.edu/~emusic/hertz.htm
Now let us compare what we know about notes and freq to the specs of the DI
in question found here
http://www.ultrasoundamps.com/pdfs/DI-Plus-wPhase-Manual.pdf
It stats you have a active EQ, which means it can both cut AND ADD volume to
the frequecy it is effecting,
a passive eq can only reduce, it has no ability to increase gain
so the first spec is
Bass +/- 12 dB at 150 hz
this is a fixed center at a point between D and D# on your B string
Not really very "bassy" in our minds as we are almost two octaves away from
our low E note played open
but it is what it is, I would have liked to see a Bass control centered down
around 80 Hz or the E note on the D string
This Bass control will boost or cut that D note and some undefined (no spec
given for filter width)notes to each side of it by up to 12 decibles, which
is quite a bit.
your next cotrol is
Treble +/- 12 dB at 5000 Hz or 5kHz
this is clearly centered above any note on your fret board and will only add
or subtract harmonics of notes
I think this is WAY too high to be really useful
I nice treble would be centered down at about 1.2kHz
but there is method to the maddness our next control is
SHAPE
which is a fixed tone , essentially a smily face on a graphic eq , boosting
lows and highs while cutting mids
it brings up the 100 Hz(around the open G string)
cuts the 1.5 kH which is the strong harmonics of the E notes
and boosts the 3kHz , again in the F# to G range harmonics
so much of what we hear from a guitar is harmonic content, not the
fundamental notes is how ultra sound decided on the point to place the eq
centers, and this choice of eq centers is fundemental to why one eq sounds
diffrent than another and why one preamp works with some guitars better than
others
it simply has EQ centers that match the personality of the instrument
the last EQ feature is a sweepable (adjustable) notch filtar, think of a
notch as a very deep cut that you can place over any one note of your
choosing
this notch is -18 dB cut and can be applied TO ANY ONE NOTE(or freq) between
the open G string and the high E at the 12th fret
when you turn the NOTCH you are moving this deep (-18dB) cut from note to
note until you find the note that is troublesome
if you are not having feedback leave this turned OFF
unfortunatly it can only do one fundamental freq and often we have more than
one freq that is troublesome, which is why a pro sound system has dozens of
points to EQ from and many many EQ's
But the Ultrasound is a pretty useful small easily handled device that give
the musician some tweekability to thier sound, without the cumbersome nature
of a full rackofparametric eq's
I hope this helps
George
George's Pro Sound Co.
Mike Brown
Thanks George, I've saved it to digest fully ay my leisure.
MJRB
Sikora Family
George,
You packed more good info into a small space than I have seen for a while.
Of course, it helps that I am looking for a preamp for my new K&K pure mini.
Charlie (just more to be thankful for) Sikora :)
--
It's not dating advice, but take out "pam" to reply.
Misifus
Like Mike, for me, that's a keeper.
DanielleOM
Thank you George for posting your in depth reply. I very much appreciate
the time you spent writing this reply.
Danielle
George's Pro Sound Co.
I used the low E on a BASS guitar not a acoustic guitar
low E on a acoustic guitar is the 82.4 Hz
the concepts still all work but you need to redo the Hz to Note info I
posted
everything doubles in freq number
I started a octave too low
sorry
george