Infinity active low x-over impedance matching question. - diyAudio
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Old 25th July 2002, 01:24 PM   #1
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Default Infinity active low x-over impedance matching question.

Hi,

The active low x-over input of Infinity's RS-1B system has an impedance matching circuit, with a few switch settings to match the electronic crossover unit to the input impedance of the mid-high power amp. The system consists of two mid-high screens and two woofer columns which have the electronic servo x-over. The mid-high screens have a passive x-over.
The input circuit is shown on the x-over image. Mind you, this is a twenty-two year old system.

Is the impedance matching still necessary, because I don't see it being used in todays active x-overs. If necessary, can it be simplified in terms of components or replaced by another more suitable circuit?

Thanks for any advice.

FranklinClick the image to open in full size.
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File Type: jpg x-over.jpg (37.2 KB, 369 views)
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Old 26th July 2002, 10:20 AM   #2
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Is there really noone who can reply to my question??
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Old 26th July 2002, 09:52 PM   #3
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OK

I say it's not necessary.



Get rid of the switch networks and adjust the 5.1 nF
value for the input impedance of the amp and the
crossover frequency you want.

2 * 3.14 * freq = 1 / (resistance * farads )

Apparently the original was crossed at 150 Hz or so
with 5 nF and 200 Kohm
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Old 27th July 2002, 03:04 AM   #4
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Default I am the VIKING of north LAND

Quote:
Originally posted by Franklin
Is there really noone who can reply to my question??
So,
I guess I am the Exception
you long for
HIM but you
see
ME
this "VIKING"
of his
CROSS
my fingers
I will tell no one!
-

-
fotenote:
(for non believers)
http://www.songlyrics.co.nz/lyrics/b...lemyguitar.htm
he went away, too soon
he belongs to my HEART even so
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Old 27th July 2002, 03:26 AM   #5
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Default Dealing With Idiots

Mr Gromanswe,
I am of Viking blood myself.
Yes, Eric the Viking of the Great Southern Land.
You do your countrymen a great disservice by continually posting rubbish such as yours.
If I were a Swede, I would be ashamed to say so in your company.
Other members here come to read and share audio information, and your idiotic posts are a plain PITA.

SO, CUT THE CRAP OR GO AWAY AND ANNOY A DIFFERENT FORUM ON THE NET - THERE ARE PLENTY FOR YOU TO CHOOSE FROM - PERHAPS GO TO SOME CONSPIRACY THEORY, OR FREE ENERGY, OR UFO, OR MENTAL HEALTH SELF HELP FORUM.
PERHAPS YOU CAN FIND ONE WHERE YOU ARE IN LIKE COMPANY.

Any backups to have this fruitcake banned from this forum ?.
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Old 27th July 2002, 03:42 AM   #6
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Default Re: Dealing With Idiots

Quote:
Originally posted by mrfeedback
Mr Gromanswe,
I am of Viking blood myself.
Yes, Eric the Viking of the Great Southern Land.
You do your countrymen a great disservice by continually posting rubbish such as yours.
If I were a Swede, I would be ashamed to say so in your company.
Other members here come to read and share audio information, and your idiotic posts are a plain PITA.

SO, CUT THE CRAP OR GO AWAY AND ANNOY A DIFFERENT FORUM ON THE NET - THERE ARE PLENTY FOR YOU TO CHOOSE FROM - PERHAPS GO TO SOME CONSPIRACY THEORY, OR FREE ENERGY, OR UFO, OR MENTAL HEALTH SELF HELP FORUM.
PERHAPS YOU CAN FIND ONE WHERE YOU ARE IN LIKE COMPANY.

Any backups to have this fruitcake banned from this forum ?.
Can you QUOTE
some rubbish of mine!
-
-
I might be able to SORT you OUT

go have a prayer to YOUR god
I believe in
My GOD
(he died for me)
and for you
my friend

gro
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Old 27th July 2002, 05:32 AM   #7
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Default Re: Dealing With Idiots

Quote:
Originally posted by mrfeedback


Any backups to have this fruitcake banned from this forum ?.
I am really surprised that no one backed MrFeedback yet. When it came to complain about Harry the outrage was widespread, but when somebody is really useless to this Forum nobody really complains. Is it because you don't care or is it because you can't comprehend the message he sends?

Although I usually don't complain, the behaviour of gromanswe is one big joke and distraction for others trying to benefit from tis place.

MrFeedback I'm backing you second time today.
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Old 27th July 2002, 07:40 AM   #8
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Nelson,

Thanks for your reply.
I'll give it a go.

Franklin
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Old 27th July 2002, 08:26 AM   #9
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Gromanswe,

Your last post seems to suggest that you are a (believing) christian! However, your behaviour on this forum is quite unbecoming of one.
__________________
Sam
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Old 29th July 2002, 05:50 AM   #10
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Default ThANKS FOR notising me, Samuel J.

Quote:
Originally posted by Samuel Jayaraj
Gromanswe,

Your last post seems to suggest that you are a (believing) christian! However, your behaviour on this forum is quite unbecoming of one.
J Christ's Behavior was Not to Comfortable
to HIS ENEMIES
So He was KILLED,

and Blame is on you and I and ME
"GUILT BY ASSOCIATION"
for something done 2002 years ago.
For in thoughts, acts and WORDS
nonone of us can say he is perfect.

So the few % I have made ANGRY and ENENMIOUS
at this Forum, I ask and beg FORGIVENESS from.
Some will give/get others will NOT GIVE/GET -
In the END it tells more about yourself, what you say
And your reaction towards me, Tells me
What you THINK! - You might think this my post OVER!
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