DAT-heads Digest #432
Contents:
interpol atlanta (Tim Dignam)
for digest - DA-P1 gain structure mod and noise reduction ("ben d")
ISO - Sting - Broken Music Tour (USA) ("Rogier van der Gugten")
Re: upcoming surround recordings and dvd authoring tools... (Dave Chapman)
Finn Brothers (Greg Weston)
Phish Tree one more time? ("Gary Davis")
Robyn Hitchcock ("K.A. Long")
From: Tim Dignam <timdignam@yahoo.com>
Subject: interpol atlanta
Date: Fri, 25 Mar 2005 09:17:31 -0800 (PST)
Did anyone tape the interpol atlanta show from
03/22/05? I'd be interested in trading for the show.
Thanks, Tim
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From: "ben d" <limeno9@hotmail.com>
Subject: for digest - DA-P1 gain structure mod and noise reduction
Date: Fri, 25 Mar 2005 17:27:37 +0000
i recently got a Tascam DA-P1 and read that there used to be an Oade mod for
gain structure. Coming here, i saw a posting from just over 5 years ago
about the removing of the 110 ohm parallel resistors on the input, and
increasing the pad resistances to reduce the levels.
(see below for previous postings)
i am fairly inexperienced electronically and would just like to clarify a
few things, does anyone know which capacitors mentioned should be put in and
where (noise reduction), and also any tips on where i should be looking, i
know if you open one up, from the top, the is a small circuit board on the
right , above the XLR inputs, and it is here that the R529 and 629's seem to
be, but where would i put the capacitors in?
this mod seems too good to pass up if you are running hot signals.
Although i won't try it right away.
Also, any tips on soldering and unsoldering the chip resistors. i get the
impression Doug Oade did his neck in doing as much!
any info or tips on this would be appreciated. i'm venturing at my own
risk.
Thanks
Ben
From: Hawker <Hawker@Connriver.net>
Subject: RE: Tascam DA-P1 Problems
Date: Thu, 19 Aug 1999 09:32:30 -0400
I think I posted this to the subscribe addy and not the post the first time
sorry if it makes it twice
Shawn the DA-P1 has a gain structure that is different than you would
expect.
(For all those who know this info I have a Mode to fix the Gain below)
1) The gain knob does not change the gain of the Mic Pre as most properly
designed Mic Pres do. Rather it is attenuative only! The Mic pre
has two fixed gain settings (0 and -20 pad). The Volume control comes
after the mic pre and is a passive attenuation. So if the level is to
hot
at the mic pres it will clip. No matter where the level knob is.
The setting is then counter-intuitive from the
way you would set say a normal outboard mic -pre. Rather than wanting
the gain knob as low as possible the best SNR is when the gain knob is
at 10.
If it is to low it means the signal is VERY hot before it and clipping
b4 it hits the knob.
In practice I have found that if that knob is set below 3.5 you are
getting distortion.
2) The 20db pad is not a pad. This is actually changing the gain of the
front end
to be 20db less actively. It is not a pad, only causes the front end
to provide
20db less gain. So don't think of this with the negative connotations
of SNR etc
that you normally would with a pad. It is not a pad.
All this said you will probably find that you are normally running pad on
with the
level knob around 5 or so (depending on mics etc). And that running without
the pad won't happen even in acoustic settings. For this reason some
"other companies" are charging folks to change the gain of the DA-P1.
Here is the mod.
=============================================
For 6db mod (reduces mic pre gain by about 6 db)
Need 2 0805 (size) 1.34k 1% resistors if you have a bunch of them hand match
them with a VOM to the closest value.
Open the DA-P1 case.. In the Mic Pre section
Remove R529 and R629 These are 110 ohm resistors.
There are two 110 ohm resistors in parallel for 55ohms. Removing one leaves
it at 110 ohms which is a 6db difference.
This is the Pad off gain.
Remove R516 and R616. Replace with the 1.34k resistors. This is the Pad on
setting
Note changing R516 and R616 to 2.23K makes a 10db mod.
To figure out different gain mods the gain formula of the front end is
20 LOG (3.9K / R) where R is the resister you are changing.
Stock is 55ohms and 620 ohms or 37.0dB and 15.97dB.
You can use any value 0805 resistor to make any gain change you want
with this formula.
Also note that on newer models Tascam left out a pile of the 0805 X7R .1uF
bypass caps around the mic pre. You may want to get a pile of these
and put them back in. It helps noise and stability a bit.
Hawker
>From: "Shawn W. Carlyle" <shawn.carlyle@anthro.utah.edu>
>Hey now DAT-Heads Im hoping for some kind advice. Ive been taping since
>'94 but Ive recently upgraded to a Tascam DA-P1. I ran this deck for the
>first time at the "Summer Session" . The problem is that all four sets had
>major distortion. I use AKG 391s, and plugged them in directly to the deck
>with the 48V phantom power. I did *not* use the 20db pad, nor the limiter.
> I kept my levels fairly conservative (the closest I got to zero
was
>11 on the Tascam display), so my first question is this: Is it common
among
>people who tape phish, widespread etc. with the DA-P1 to use the 20db mic
>pad? I really didnt anticipate that the signal would be strong enough to
>overload the XLR inputs--it was a fairly small venue.
From: "Rogier van der Gugten" <gugten@cybercomm.nl>
Subject: ISO - Sting - Broken Music Tour (USA)
Date: Fri, 25 Mar 2005 19:08:14 +0100
Hi there,
Is anyone planning to record any of the upcoming Sting shows in the US?:
http://www.police.cybercomm.nl/tour-s09.htm
Please let me know!
Take care,
Rogier.
Rogier's Police Page: http://www.police.cybercomm.nl/
e-mail: gugten@cybercomm.nl
From: Dave Chapman <dave@dchapman.com>
Subject: Re: upcoming surround recordings and dvd authoring tools...
Date: Fri, 25 Mar 2005 18:20:26 +0000
Nick Zuccaro wrote:
> hey there, i'm going to do MMW's cleveland, columbus, and
> pittsburgh shows in blumlein stereo that i'm going to convert
> into surround recordings - only thing is i don't have any of the
> dvd authoring tools to be able to burn the final surround
> recording...so i'm looking to partner up with somebody that i
> can send _either_ the 2 channel masters to, or do the matrix
> myself and send 5 channels (or 5.1?) to and have them burn a
> dvd-v of the master in surround....the rig i'll be running is
> akg c414(blumlein)->v2->minime and i'm doing atleast the
> cleveland and pittsburgh shows, possibly columbus too...i think
> i'm going to do 48/24 format (vx pocket limited) and do the
> final dvd in video format (not dvd-a) as linear pcm.
> suggestions?? so if you've got the tools and the interest drop
> me a line...l8r...Nick
Firstly, I don't think that you will be able to do this using
uncompressed LPCM with DVD-V. 6 channels of 24-bit/48KHz uncompressed
LPCM requires 6,912,000 bits/second. The DVD-Video spec limits the
audio to 6.144Mbit/s.
You could use 16-bit/48KHz or AC3/DTS lossy compression, but that's not
an ideal solution.
DVD-Audio allows up to 9.6Mbit/s of uncompressed LPCM audio, and your
24-bit/48KHz 6-channel recordings would be under that limit. On a
standard 4.7BGB DVD-R, you could fit about 100mins of 24/48/6-ch, more
if you only used 5 channels.
As you probably know, the cheapest commercial DVD-A software is
Discwelder Bronze (about $99 USD), and that will burn a DVD-A with 6-ch
24/48 audio.
Alternatively, I'm currently in the process of developing an open
source, cross-platform DVD-Audio authoring application. Currently it
can only deal with 16-bit mono or stereo audio (at any samplerate from
44.1KHz up to 192KHz), but 24-bit and 6-channel will be implemented
soon. The project home page is here:
http://dvd-audio.sourceforge.net/
Hopefully by the time you have mastered your recordings, my program will
be able to author 24-bit multichannel files.
Dave.
From: Greg Weston <timbergreg@gmail.com>
Subject: Finn Brothers
Reply-To: Greg Weston <timbergreg@gmail.com>
Date: Sat, 26 Mar 2005 02:27:54 -0800
Once again I'm looking for ANY recent Finn Brothers (or related...Neil
Finn, Tim Finn, Crowded House, Split Enz, Betchadupa, Largest Living
Things, ALT, etc.) on DAT or CDR. Have lots to trade! Thanks!
timbergreg@gmail.com OR gregweston@frenzmail.net
From: "Gary Davis" <g@hoxnet.com>
Subject: Phish Tree one more time?
Reply-to: g@hoxnet.com
Date: Sat, 26 Mar 2005 04:45:29 -0800
Hello all heads...
I would like one more time to try to setup a tree for the
Lemmonwheel set that Whit and I remastered (from fob) a few
years back. It's about 10 CDs or one disc in MP3 and with Phish
gone (forever?) maybe we have time to do this now.
I am looking for one person who can setup a simple website and
then setup an email address (preferrably not web-based, so you
can load the emails directly into your computer and manipuate the
data to make a tree), and finally make a tree and post it and email
it.
I will NOT take direct requests for the 10 disc set but I will consider
some B&P's for the single-disc MP3 version.
But I have some nice sample files for a website and it would be fun
to try an old-fashion tree.
--thanks
---Gary
P.s. we do NOT have to advertise this on any groups other than
DAT-heads if you want to keep the tree size more managable.
From: "K.A. Long" <klong@olotp.org>
Subject: Robyn Hitchcock
Reply-to: <klong@olotp.org>
Date: Sat, 26 Mar 2005 11:45:09 -0500
Hello,
I'm looking to trade or barter for a copy of the Annapolis
show this past week or any of his past work. I have an eclectic
collection to trade from.
Thanks in advance,
Kim
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