11 Jan
2007
11 Jan
'07
5:23 p.m.
Hi
I've been playing with fastbreeder, and am extremely pleased with the
truly wonderful noises it can do (thanks Dave!!!!)
However looking at some of the results in mhwaveedit it seems that it's
injected with electrical/non-acoustic phenomenons like dc-offset and low
frequencies. I'm wondering how a home stereo and/or a large PA would
react to such sounds? Is there anything I should/could do to prevent
black smoke from coming out of amplifiers and speakers (ears would be ok
:-))? Or should I simply not worry.
I put a sample at http://atte.dk/download/fb_abuse_groove_3.ogg if
someone wants to have a look for themselves what I'm referring to...
--
peace, love & harmony
Atte
http://www.atte.dk | quintet: http://www.anagrammer.dk
| compositions: http://www.atte.dk/compositions
11 Jan
11 Jan
5:48 p.m.
On Thu Jan 11, 2007 at 11:12:42PM +0100, Atte André Jensen wrote:
Hi
I've been playing with fastbreeder, and am extremely pleased with the truly wonderful
noises it can do (thanks Dave!!!!)
However looking at some of the results in mhwaveedit it seems that it's injected with
electrical/non-acoustic phenomenons like dc-offset and low frequencies. I'm wondering
how a home stereo and/or a
large PA would react to such sounds? Is there anything I should/could do to prevent black
smoke from coming out of amplifiers and speakers (ears would be ok :-))? Or should I
simply not worry.
I put a sample at http://atte.dk/download/fb_abuse_groove_3.ogg if someone wants to have
a look for themselves what I'm referring to...
i played it at the loudest volume (including "External Amplifier" boost) on my
MSI MS-1013, and the onboard speakers suffered no ill effects. in fact i think stuff
sounds better now
on really expensive speakers, ones youre afraid you might destroy, they praobly already
have various crossover/fuse/compressor safeguards on the amplification chain. but im sure
no safeguard is perfect
--
peace, love & harmony
Atte
http://www.atte.dk | quintet: http://www.anagrammer.dk
| compositions: http://www.atte.dk/compositions
6:12 p.m.
On Thu, 11 Jan 2007 23:12:42 +0100
Atte André Jensen <atte.jensen(a)gmail.com> wrote:
Hi
I've been playing with fastbreeder, and am extremely pleased with the
truly wonderful noises it can do (thanks Dave!!!!)
However looking at some of the results in mhwaveedit it seems that it's
injected with electrical/non-acoustic phenomenons like dc-offset and low
frequencies. I'm wondering how a home stereo and/or a large PA would
react to such sounds? Is there anything I should/could do to prevent
black smoke from coming out of amplifiers and speakers (ears would be ok
:-))? Or should I simply not worry.
I put a sample at http://atte.dk/download/fb_abuse_groove_3.ogg if
someone wants to have a look for themselves what I'm referring to...
It shouldn't be any kind of a problem on and even half-decent audio
system (which should have appropriate filters built in). The worst That
could happen is that extreme LF at high amplitude just might tend to
overload input stages, which won't sound very nice. I've heard the
effect described as bugling under water!
Wow! Just looked at it in Audacity - it's pretty extreme! Still
shouldn't be a problem though.
--
Will J G
6:15 p.m.
On 1/11/07, Atte André Jensen <atte.jensen(a)gmail.com> wrote:
Hi
I've been playing with fastbreeder, and am extremely pleased with the
truly wonderful noises it can do (thanks Dave!!!!)
However looking at some of the results in mhwaveedit it seems that it's
injected with electrical/non-acoustic phenomenons like dc-offset and low
frequencies. I'm wondering how a home stereo and/or a large PA would
react to such sounds? Is there anything I should/could do to prevent
black smoke from coming out of amplifiers and speakers (ears would be ok
:-))? Or should I simply not worry.
I put a sample at http://atte.dk/download/fb_abuse_groove_3.ogg if
someone wants to have a look for themselves what I'm referring to...
--
peace, love & harmony
Atte
Hi Atte,
I doubt the DC offset would get as far as the PA or stereo.
Something in the signal path is going to be AC coupled for safety
reasons so that would get knocked out. (None the less be careful!) :-)
As for the low frequency issue why not put a high pass filter, in
Jack Rack or in the program itself if it supports normal LADSPA
plugins, to get rid of that issue?
Hope this helps,
Mark
12 Jan
12 Jan
1:33 a.m.
Mark Knecht wrote:
I doubt the DC offset would get as far as the PA or
stereo.
Something in the signal path is going to be AC coupled for safety
reasons so that would get knocked out. (None the less be careful!) :-)
Ok. Thanks for commenting.
As for the low frequency issue why not put a high
pass filter, in
Jack Rack or in the program itself if it supports normal LADSPA
plugins, to get rid of that issue?
That's a good idea. I'll do a highpass in sox at 20Hz or so...
--
peace, love & harmony
Atte
http://www.atte.dk | quintet: http://www.anagrammer.dk
| compositions: http://www.atte.dk/compositions
3:45 a.m.
Hallo!
However looking at some of the results in mhwaveedit
it seems that it's
injected with electrical/non-acoustic phenomenons like dc-offset and low
frequencies. I'm wondering how a home stereo and/or a large PA would
react to such sounds? Is there anything I should/could do to prevent
black smoke from coming out of amplifiers and speakers (ears would be ok
:-))? Or should I simply not worry.
As the others already said you should at least use a highpass to remove
the DC ...
We once played with PD until all the loudspeakers were (unfortunately)
damaged ... ;)
LG
Georg
5:26 a.m.
Georg Holzmann wrote:
As the others already said you should at least use a
highpass to remove
the DC ...
At least? Other things I should run it through?
We once played with PD until all the loudspeakers were
(unfortunately)
damaged ... ;)
:-(
--
peace, love & harmony
Atte
http://www.atte.dk | quintet: http://www.anagrammer.dk
| compositions: http://www.atte.dk/compositions
7:44 a.m.
Hallo!
Well, you could also a limiter+etc. - but I think the biggest problem is
the DC offset ...
Because if you have no DC-offset you will here when it is too loud and
can decrease the volume ...
But it was funny :)
LG
Georg
As the others
already said you should at least use a highpass to
remove the DC ...
At least? Other things I should run it through? We once played
with PD until all the loudspeakers were (unfortunately)
damaged ... ;)
:-( 
8:27 a.m.
On 1/12/07, Georg Holzmann <georg.holzmann(a)student.kug.ac.at> wrote:
Hallo!
Well, you could also a limiter+etc. - but I think the biggest problem is
the DC offset ...
Because if you have no DC-offset you will here when it is too loud and
can decrease the volume ...
I think there is a DC-offset remover ladspa plugin...
James
As the
others already said you should at least use a highpass to
remove the DC ...
At least? Other things I should run it through? 
12:39 p.m.
On Fri, Jan 12, 2007 at 01:25:08PM +0000, James Stone wrote:
On 1/12/07, Georg Holzmann
<georg.holzmann(a)student.kug.ac.at> wrote:
FWIW, I've been experimenting with a pair of Harrison Labs FMOD
passive highpass filters. They're very portable, being built into a
small brass female -> male RCA adapter. They're also pretty cheap,
about $25 US for a package of two.
I haven't used mine much yet but they seem to work as advertised. I
got the 30Hz model. That's the -3 dB point, and they're all 12 dB /
octave.
I'm wondering if I should have got the 50 Hz model, since the vast
majority of output from typical PA subwoofers is in the 50 Hz - 200 Hz
range anyway. (The fundamental of a low E on a bass guitar is about
40 Hz, but most of the energy of that note is in the first few
overtones.)
Supposedly you can daisy-chain two filters with an attenuator plug in
the middle to make a 24 dB/octave filter with the crossover point cut
in half. I haven't tried that.
The website is unfortunately pretty bad, and hard to find exactly what
you're looking for...
http://www.hlabs.com/technical/crossovers/
List of color-coded FMOD models:
http://www.hlabs.com/technical/crossovers/page2.html
--
Paul Winkler
http://www.slinkp.com
Hallo!
Well, you could also a limiter+etc. - but I think the biggest problem is
the DC offset ...
Because if you have no DC-offset you will here when it is too loud and
can decrease the volume ...
I think there is a DC-offset remover ladspa plugin... As the
others already said you should at least use a highpass to
remove the DC ...
At least? Other things I should run it through? 
5:40 p.m.
On Sat, Jan 13, 2007 at 12:23:42AM +0300, Dmitry Baikov wrote:
On 1/12/07, Paul Winkler <pw_lists(a)slinkp.com>
wrote:
Heh. ok, but the point still stands... you're mostly hearing
overtones. There is not a whole lot of energy coming from that bass at
27.5 Hz. Most of it is above 50 Hz.
And most bass rigs and PA subwoofers don't have much output down at
27.5 Hz. Pretty much everything I know of has a steep rolloff well
above 30 Hz.
There are very few instruments that really have much output in the
lowest octave of human hearing (20 - 40 Hz). IIRC pipe organ is one,
the lowest frequency from a 32-foot pipe is actually below 20 Hz.
Synthesizers of course can do anything :-) But even in heavily
synthetic dance music most of the bass energy is typically up around
80 Hz or so.
--
Paul Winkler
http://www.slinkp.com
range anyway. (The fundamental of a low E on a
bass guitar is about
40 Hz, but most of the energy of that note is in the first few
overtones.)
Fieldy/Korn plays on low string tuned to A - 27.5Hz :) 
6:51 p.m.
Dmitry Baikov wrote:
On 1/12/07, Paul Winkler <pw_lists(a)slinkp.com>
wrote:
Standard concert pitch tuning is 440Hz for the A above middle C. So
every 88-key piano's lowest note is 27.5Hz. What took him so long to
catch up? ;-)
I believe the lowest pitch on a pipe organ would come from one of the
two 64' pipes that exist in the world. The low C on a pipe organ
keyboard's reference pitch is 64Hz for an 8' pipe, so a 64' pipe would
be three octaves below that = 8Hz.
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
range anyway. (The fundamental of a low E on a
bass guitar is about
40 Hz, but most of the energy of that note is in the first few
overtones.)
Fieldy/Korn plays on low string tuned to A - 27.5Hz :) 
5:36 a.m.
On Fri, Jan 12, 2007 at 09:47:35AM +0100, Georg Holzmann wrote:
We once played with PD until all the loudspeakers were
(unfortunately)
damaged ... ;)
I've unfortunately done this to club speakers once using a Gameboy
Advance and a Commodore 64 running through various pedals. Our residency
at that place was cut pretty short after that. :/ I wouldn't take it as
a given that a venue would have filtering in place to save their
speakers from dammage.
Chris.
-------------------
chris(a)mccormick.cx
http://mccormick.cx
6565
days inactive
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days old
linux-audio-user@lists.linuxaudio.org
13 comments
10 participants
participants (10)
-
Atte André Jensen -
carmen -
Chris McCormick -
david -
Dmitry Baikov -
Folderol -
Georg Holzmann -
James Stone -
Mark Knecht -
Paul Winkler