Comments

PipelineAudio wrote on 11/9/2000, 2:59 PM


David W. Ruby wrote:
>>I am having a heck of a time placing my sub in our room.
>>A little bass heavy on one side as well as standing up in
>>the room the bass sounds better.
>>Anyone have a good method of placement for these beasts?
>>Thanx:-)

As far as I can tell, you can put these anywhere, hopefully taking
symetry into account.

What is it that you want them to do?

In my case I my mains system had 4 12" speakers in it so the only
boost I needed was in the 80 Hz and below range.

If you are using it to complement a set of NS-10's however, you are
looking at around 150Hz to 120 HZ as the top end of the sub's duty

In my case there are two positions I want to cover with the best
possible audio

first is the mix position
second is the back couch, where the "talent" usually hangs out

bass response was already quite at odds between these two positions,
so using Extreme Ghetto Technology, I took four 4x8 sheets of
perfboard, some 2x4's, and STC 60 fiberglass and made my own hemholz
resonators on the back wall right behind the couch, and covered it up
with some burgundy burlap from an unnamed politician's campaign
banner that was sitting in the wrong part of town.

once my room was more in order bass wise, I started looking for a sub.
First I tried it under and behind the back couch...girls and rappers
seemed to like it, but the resonator was eating most of the bass
before it could reach me at the console

I ended up putting it behind the console, on the ground, between my
mains, sticking straight up

The new question was: just exactly where, from the front to the back
of the room would I stick this sucker?

Using EGT again I pulled out my trusty and cheap DOD real time
analyser, and a shure Beta52 microphone. I placed the mic at sitting
head level about three quarters of the way between my mix position
and the couch. Then I ran an 80 Hz tone from sound forge ( tools--
>synthesis---> simple, I think ) and moved the sub cabinet back and
forth until the combined signal from the mains and the sub gave me
the highest reading on the RTA. To my surprise, the optimum position
for the sub could be moved a foot up and a foot back and still have
the same results....so,

because I am anal like this, and cant leave well enough alone, I
turned off the subs, and opened an audio app called " penguin audio
meter" I ran the 80hz tone agin just through the mains and drew on
the screen, with a dry erase marker, the position of the main's
waveform relative to the waveform coming out of soundforge...
Then I turned on only the sub and moved it till the waveform lined up
with my marker markings, now the new window of acceptable tolerance
was within inches....

Exact enough for me!
anyone know a good solution for getting allegedly dry erase marker
stains off a monitor?

I should say though, that after all this ,well a year or so after
this, I soffit mounted my mains and havent had to use the sub
anymore. I have had to turn down a LOT of the sub bass that the
soffits added. By the way, your local liquor store routinely throws
away wine racks made out of nice oak wood that you can easily turn
into BEAUTIFUL speaker soffits, itll take you about 11 trips to
different Liquor stores to get enough wood, but once they are standed
and stained, you will be the envy of all your peers, at least that's
how I'd like to think it worked for me
Rednroll wrote on 11/9/2000, 5:38 PM
Aaron you are a genious, and I thought I use to be resourceful, but I
can't hold a candle to you. David, if your as anal as Aaron and have
his resourcefulness then by all means follow his instructions.

Otherwise, you can place the sub in any place in the room.
Subwoofers are "non directional", meaning that the wavelenghts they
produce are much longer than the width of your head, thus the ears
can't really deceive where the bass is coming from. I would place it
in any open area in the room, making sure it is pointed in the same
direction as the mains to avoid possible phase problems, and also try
not to mount it under a table, so you don't get any reflections. The
most important thing you need to do, is build a bass trap in a corner
of your room. You can build your own bass trap by any means Aaron
has previously mentioned. You can basically fill a corner with a lot
of insulation or absorbant material and then frame it in with 2x4's
and then cover it with material like Aaron suggested to make it look
nice. There's many websites on the internet on building bass traps,
but basically a bass trap helps illiminate standing waves which occur
with low frequencies.

Aaron Carey wrote:
>>
>>
>>David W. Ruby wrote:
>>>>I am having a heck of a time placing my sub in our room.
>>>>A little bass heavy on one side as well as standing up in
>>>>the room the bass sounds better.
>>>>Anyone have a good method of placement for these beasts?
>>>>Thanx:-)
>>
>>As far as I can tell, you can put these anywhere, hopefully taking
>>symetry into account.
>>
>>What is it that you want them to do?
>>
>>In my case I my mains system had 4 12" speakers in it so the only
>>boost I needed was in the 80 Hz and below range.
>>
>>If you are using it to complement a set of NS-10's however, you are
>>looking at around 150Hz to 120 HZ as the top end of the sub's duty
>>
>>In my case there are two positions I want to cover with the best
>>possible audio
>>
>>first is the mix position
>>second is the back couch, where the "talent" usually hangs out
>>
>>bass response was already quite at odds between these two
positions,
>>so using Extreme Ghetto Technology, I took four 4x8 sheets of
>>perfboard, some 2x4's, and STC 60 fiberglass and made my own
hemholz
>>resonators on the back wall right behind the couch, and covered it
up
>>with some burgundy burlap from an unnamed politician's campaign
>>banner that was sitting in the wrong part of town.
>>
>>once my room was more in order bass wise, I started looking for a
sub.
>>First I tried it under and behind the back couch...girls and
rappers
>>seemed to like it, but the resonator was eating most of the bass
>>before it could reach me at the console
>>
>>I ended up putting it behind the console, on the ground, between my
>>mains, sticking straight up
>>
>>The new question was: just exactly where, from the front to the
back
>>of the room would I stick this sucker?
>>
>>Using EGT again I pulled out my trusty and cheap DOD real time
>>analyser, and a shure Beta52 microphone. I placed the mic at
sitting
>>head level about three quarters of the way between my mix position
>>and the couch. Then I ran an 80 Hz tone from sound forge ( tools--
>>>synthesis---> simple, I think ) and moved the sub cabinet back and
>>forth until the combined signal from the mains and the sub gave me
>>the highest reading on the RTA. To my surprise, the optimum
position
>>for the sub could be moved a foot up and a foot back and still have
>>the same results....so,
>>
>>because I am anal like this, and cant leave well enough alone, I
>>turned off the subs, and opened an audio app called " penguin audio
>>meter" I ran the 80hz tone agin just through the mains and drew on
>>the screen, with a dry erase marker, the position of the main's
>>waveform relative to the waveform coming out of soundforge...
>>Then I turned on only the sub and moved it till the waveform lined
up
>>with my marker markings, now the new window of acceptable tolerance
>>was within inches....
>>
>>Exact enough for me!
>>anyone know a good solution for getting allegedly dry erase marker
>>stains off a monitor?
>>
>>I should say though, that after all this ,well a year or so after
>>this, I soffit mounted my mains and havent had to use the sub
>>anymore. I have had to turn down a LOT of the sub bass that the
>>soffits added. By the way, your local liquor store routinely throws
>>away wine racks made out of nice oak wood that you can easily turn
>>into BEAUTIFUL speaker soffits, itll take you about 11 trips to
>>different Liquor stores to get enough wood, but once they are
standed
>>and stained, you will be the envy of all your peers, at least
that's
>>how I'd like to think it worked for me