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-   -   Surround sound in stereo amplifiers? (http://www.digitalfaq.com/archives/audio/8483-surround-sound-stereo.html)

jorel 03-05-2004 11:59 AM

Surround sound in stereo amplifiers?
 
a long time, i had some magazines called "stereo review"!
one article that i test and works very fine....
but in my words, i don't have the magazine no more!

in stereo amplifiers we have the right and left channels,
with one speaker in each. dhahh!

each speaker have the positive (+) and negative (-) bornes
plugged in the positive (+) and in the negative (-)
of each channel from the amplifier...(dhahhh again).

with 2 more speakers, (read the hints in the end of this post)
we can get a incredible surround sound!

---> jump the NEGATIVES (-) of this news speakers TOGETHER!

--->then take one POSITIVE (+) of this speakers and plug in the
POSITIVE (+) of the RIGHT channel from the amplifier.
--->take the other POSITIVE (+) of the other speaker and plug in the
POSITIVE (+) of the LEFT channel from the amplifier.

how it works....example:
if the right channel have the guitar,
the left channel have the drums and
in both have the voice.

in the new surround speaker you will get the guitat and drums
and a little reverberation (if any) from the voice!
this new surround speakers only sound the differences from the channels!
everything that is common in the 2 channels,don't will be sound in the surround, right?
:wink:

little hint:
you can use only one speaker
---> only IF
the impedance of this speaker have the DOUBLE impedance
of the minimal impedance of the amplifier use!
if the amplifier support minimal 4 ohms per channel,
the speaker needs 8 ohms minimal.
sorry the "redundance" but is to be it clear!

go ahead, i use it from 30 years ago...
a long time ago when dolby surround don't exist!
:)

kwag 03-05-2004 04:55 PM

I have used that too for the last 20+ years :mrgreen:
It's called "Phantom Center Chanel" :D

-kwag

jorel 03-05-2004 06:16 PM

really?
you too?
8O
i was forgot the name... "Phantom Center Chanel" !
:D

is surprising don't ?
:wink:

kwag 03-05-2004 06:24 PM

Quote:

Originally Posted by jorel
really?
you too?
8O
i was forgot the name... "Phantom Center Chanel" !
:D

is surprising don't ?
:wink:

Yes it is :)
You hear things that are not present in either the left or the right channel.
I guess it can be called artefacts of phase cancellation and phase inversion :cool:

-kwag

jorel 03-05-2004 06:32 PM

Kwag wrote:
"I guess it can be called artefacts of phase cancellation and phase inversion"

exact!!!!!

like a "differencial amplifier" using integrated circiut operacional amplifier! (if i wrote right)
everything equal is cancelled!

8O
see?
eletronic is like "fever"!
:lol:

kwag 03-05-2004 06:40 PM

Quote:

Originally Posted by jorel
like a "differencial amplifier" using integrated circiut operacional amplifier! (if i wrote right)
everything equal is cancelled!

That's it.
You mean "Differential OP Amp" :cool:
A 741 OP AMP IC Chip, if I recall the correct number :mrgreen:
I used that chip so many times :!:
Also the 555 timer and the 565 PLL :cool:

-kwag

jorel 03-05-2004 06:44 PM

Quote:

Originally Posted by kwag
Quote:

Originally Posted by jorel
like a "differencial amplifier" using integrated circiut operacional amplifier! (if i wrote right)
everything equal is cancelled!

That's it.
You mean "Differential OP Amp" :cool:
A 741 OP AMP IC Chip, if I recall the correct number :mrgreen:
I used that chip so many times :!:
Also the 555 timer and the 565 PLL :cool:

-kwag

correct (one more time)....you recall right!
:lol:

kwag 03-05-2004 06:56 PM

Hey jorel, I guess you were one of the kids in the block who would tune in on AM stations,
using a Germanium diode hooked up to a small coil/capacitor tuned tank circuit and Crystal earphones, right :?: :rotf: :beard:

( Because I did too :!: :lol: )

-kwag

jorel 03-05-2004 07:12 PM

Quote:

Originally Posted by kwag
Hey jorel, I guess you were one of the kids in the block who would tune in on AM stations,
using a Germanium diode hooked up to a small coil/capacitor tuned tank circuit and Crystal earphones, right :?: :rotf: :beard:

( Because I did too :!: :lol: )

-kwag

everything is possible but "kids on the block" never!
:lol: :lol: :lol:

Germanium diode is used in one "dobrator" for guitars.
if i change for silicium (all models) the circuit don't work!
small coil/capacitor tuned tank circuit do miracles!
my stereo Crystal earphone is broken but i have one mono that never was used!

hey,this is the proove that i'm old!
8O
:lol:

kwag 03-05-2004 07:34 PM

Quote:

Originally Posted by jorel

hey,this is the proove that i'm old!
8O
:lol:

Naaaah. Old is when we start talking about peaking the bias of the grid on a vacuum tube, or getting a jolt by touching the plate connector :lol: 8O
Or using a VTVM instead of a regular voltmeter, for precise measurements.
Damn, where's my old Heathkit VTVM. :roll: :lol:
Yes, I guess we're old :mrgreen:

-kwag

GFR 03-08-2004 08:26 AM

Quote:

Originally Posted by kwag
Quote:

Originally Posted by jorel

hey,this is the proove that i'm old!
8O
:lol:

Naaaah. Old is when we start talking about peaking the bias of the grid on a vacuum tube, or getting a jolt by touching the plate connector :lol: 8O
Or using a VTVM instead of a regular voltmeter, for precise measurements.
Damn, where's my old Heathkit VTVM. :roll: :lol:
Yes, I guess we're old :mrgreen:

-kwag

You see, I have a rule for audio amps: if it doesn't glow in the dark and you can't burn your fingers with it, it ain't worth listening to. :)

jorel 03-11-2004 04:43 PM

link with illustrations and more big details,
now you can do it easy....

http://home.earthlink.net/~kantack/surround2.htm

:wink:

thanks to LTR12101B that found this link
after i posted the same in dvdrbase!
:)

kwag 03-11-2004 05:31 PM

That's exactly it, jorel :D

-kwag


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