The panels used in the Spectra 11/1100 are identical to any other Spectra panel. All Spectra panels are identical at 9" wide...there are no 8" Spectra's.
Both bottom & top this is what it looks like YES my 1+1s are done.
Someone please explain to me...in solid technical terms...how this modification can increase efficiency by any amount, let alone 3 dB. Color me skeptical.
Well then the info I came across last night saying the 11/1100 had 8" wide panels must have been wrong....and I'm very happy to hear that's the case!
So, just to be clear...panels from the Spectra 11/1100 can be used as a direct replacement for the bass panel in the Spectra 22...correct? Which I'm kind of thinking is not the case since they would be wired to be mid/hi panel only. If so, can the wiring be modified to make them a bass panel?
And just out of curiosity...seems I read my interfaces can drive three panels. Can a second set of bass panels be added to my Spectra 22's if I were to build frames to accommodate them...essentially creating a Spectra 33? And wasn't I also told three panels actually makes for an easier load to drive?
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You are welcome. That's why I'm here: about 50% to provide accurate factory information, and about 50% to dispel bad information.
Dear Acoustatanswer man !
Wow ... 3 db is far more than optimistic... That would mean twice the original sound level. Magic. Not possible you are 100% right.
I made this mod on 3 speakers, the most impressive change was on the model 1 and 1+1. But it was also clearly audible on the Spectra 2200 ones.
Result is a reinforced dynamic, clearer bass, and a better stereo imaging (on the 1+1). Measurement showed indeed a visible modification of the impulse response, but nothing significant on the amplitude/frequence curve. It was years ago, and I will take the time to make the measurements once again with a more modern measurement system.
Engineer by myself, I guessed many time the "Why ?', but all my conclusions were nonsense I must say. The voltage should be then same within the whole length of the wire. And the wire resistivity is very low in comparision with the 100kohm of the interface delay line.
So the explanation would be more on the side of the power consumption, (the miliamperes who travel through the wire). Is that possible that the external side of the pannels act as an 'hole', and that the areas at the end of the wire (more than 20meters) receive less power ?
Mathieu
Wow ... 3 db is far more than optimistic... That would mean twice the original sound level. Magic. Not possible you are 100% right.
I made this mod on 3 speakers, the most impressive change was on the model 1 and 1+1. But it was also clearly audible on the Spectra 2200 ones.
Result is a reinforced dynamic, clearer bass, and a better stereo imaging (on the 1+1). Measurement showed indeed a visible modification of the impulse response, but nothing significant on the amplitude/frequence curve. It was years ago, and I will take the time to make the measurements once again with a more modern measurement system.
Engineer by myself, I guessed many time the "Why ?', but all my conclusions were nonsense I must say. The voltage should be then same within the whole length of the wire. And the wire resistivity is very low in comparision with the 100kohm of the interface delay line.
So the explanation would be more on the side of the power consumption, (the miliamperes who travel through the wire). Is that possible that the external side of the pannels act as an 'hole', and that the areas at the end of the wire (more than 20meters) receive less power ?
Mathieu
Why is soldering supposed to be a 3db MOD.....ok maybe 2db.............but it a great mod..the diff in using tube amp to drive Acoustat...are not
Well look..... some have been talking about the panels wire lite show....I saw this in the 80s with my Acoustat Xs....thay were driven with the tube sevos Amp....Boy in the dark my room was glowing to the beet..an you could see the only about half the panels wire was brite .... the other half of the wire was about half as brite......
Why... All The wire in the Acouistats panels...just come in from the Amp interfaces... an gos up an down minny times an just endes! ..so the half of the panel were the one wire comes in gets more drive...
With the mod the 121.or 2123 interfaces no longer have to drive the ...wire ......see all the panel as one thing ....this is how i see it...an hear it...
Like ML....thay are more efficient...the metalis one peace...lot ezer to drive...less loss....
Long like Acoustats.....panels anyway...
Well look..... some have been talking about the panels wire lite show....I saw this in the 80s with my Acoustat Xs....thay were driven with the tube sevos Amp....Boy in the dark my room was glowing to the beet..an you could see the only about half the panels wire was brite .... the other half of the wire was about half as brite......
Why... All The wire in the Acouistats panels...just come in from the Amp interfaces... an gos up an down minny times an just endes! ..so the half of the panel were the one wire comes in gets more drive...
With the mod the 121.or 2123 interfaces no longer have to drive the ...wire ......see all the panel as one thing ....this is how i see it...an hear it...
Like ML....thay are more efficient...the metalis one peace...lot ezer to drive...less loss....
Long like Acoustats.....panels anyway...
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That would mean twice the original sound level. Magic. Not possible you are 100% right.
................................Boy thats a fact Jack............................................An your right!
An i have been wating for years...... for others to be 100% right.............I can only talk about my finding......................an like any thing in Audio....All things are ...subject to chang with out notice..............Right
How about..... night An day diff in sound...some say thay cant see it.....but if you dont go.....you dont Know
So i say...hehe..........It all about the sound to me...
other can spend there time saying ....Why...
Iam just playing music.....gofig
................................Boy thats a fact Jack............................................An your right!
An i have been wating for years...... for others to be 100% right.............I can only talk about my finding......................an like any thing in Audio....All things are ...subject to chang with out notice..............Right
How about..... night An day diff in sound...some say thay cant see it.....but if you dont go.....you dont Know
So i say...hehe..........It all about the sound to me...
other can spend there time saying ....Why...
Iam just playing music.....gofig
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Back... to the But again..................................
As you see in the pic of the mod!
If driven hard...there can be Flash over...thats the ends of the interfaces secdary trying to Short out..........i cover the wire with HOT glue....works great. an when good an dry can be pulled off..I dont even put grell cloth on my panels....dust an hair can make a bridg...hehe...glue stops that!
As you see in the pic of the mod!
If driven hard...there can be Flash over...thats the ends of the interfaces secdary trying to Short out..........i cover the wire with HOT glue....works great. an when good an dry can be pulled off..I dont even put grell cloth on my panels....dust an hair can make a bridg...hehe...glue stops that!
The only thing I see this mod do is parallel feed signal to the stators, as opposed to series feed thru single wire. Should there be a break in the original "series feed" stator wire someplace in that length, you would get no sound from that downstream section....
I don't see any electrical reason from increase in SPL....
I don't see any electrical reason from increase in SPL....
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I will tell my friend not to lose his time on that mod just on his pair of Spetra 8800s that is close to 100 hours of work sorry i don't see him doing all that work for nothing.
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Just to reiterate: ALL Spectra panels are identical, regardless of which model they're in, and regardless of which sector they have been assigned to. The panels become 'full range', 'mids & lows only' and 'lows only' by virtue of how they are wired to the interface.
Yes, you can make a Spectra 22 into a 33 by adding an extra panel. The MK-2123 interface is the same for 2 and 3 panel Spectras, except that a different bass equalization tap is used, corresponding to the number of panels. Changing the bass tap is not as easy as on the MK-121, as it requires considerable disassembly of the interface to access the wires underneath the two audio transformers. But I do recommend changing the bass tap if converting to a 3-panel system, otherwise you'll likely have too much bass.
The extra 'lows only' panel that you will be adding will be wired to the existing 'lows only' output of the interface: just like the existing 'lows only' sector on your current two panel system. The wiring for the remainder of the sectors will stay the same.
Versus a 2-panel system, a 3-panel Spectra system will offer an improvement in efficiency, as well as deeper bass response and wider dynamics. And thanks to Spectra's electrically-shaped dispersion, the imaging characteristics will remain unchanged. That's something that could NOT be said about pre-Spectra models!
John.............
What if we take a 1" pipe.....run 5ea sprinklers head run them in series off the pipe .....the last head well always put out less..................run a smaller pipe to each head an thay all well put out the same................i know it not the same but close for a way of looking at it.............
As i said.. i can see only half the panel glow brite...There more loss from the wires ....When drivein in series....When in parallel it like a res....On papermay look the same.....But to most ears it gives more output.....this a old mod...An yes if someone gos nut ...are not handy with there Diy skills....thay may Kill a panel...But it works.... if this mod is not done you have not heard the real Sound the panels can put out!
But i can only speak for my self....But if it makes you feel bad are theres NO way you can see how it could work... Dont do this Mod...hehe...Your are alway working on your Audio.....someone like myself have the time to do all these Mods......Yes i am a Audio ESL Nut ...
What if we take a 1" pipe.....run 5ea sprinklers head run them in series off the pipe .....the last head well always put out less..................run a smaller pipe to each head an thay all well put out the same................i know it not the same but close for a way of looking at it.............
As i said.. i can see only half the panel glow brite...There more loss from the wires ....When drivein in series....When in parallel it like a res....On papermay look the same.....But to most ears it gives more output.....this a old mod...An yes if someone gos nut ...are not handy with there Diy skills....thay may Kill a panel...But it works.... if this mod is not done you have not heard the real Sound the panels can put out!
But i can only speak for my self....But if it makes you feel bad are theres NO way you can see how it could work... Dont do this Mod...hehe...Your are alway working on your Audio.....someone like myself have the time to do all these Mods......Yes i am a Audio ESL Nut ...
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I have also seen Acoustat panels..... non Spectra that had 4ea wires....the wire came in too one end an went out the other side of the front..... an same on the back....so the panels were feed from the 121 interfaces from bouth ends.....So jim had to know this had to help give better output.....i have had a lot of panel in almost 30years...
More i think about it...if the panels input... are feed from one side as most old panels are....an you can see when driven hard.....that the input side glows briter an more an more res....that means heat an more res...This will get the wire coating hoter at the input side.. than at the other end that is cut off...with this mod all the panels wire is driven eqealy....this in it self well show the interfaces a ezer drive... less res push back.....less heat on the interfaces an amp....there for more an better output.
More i think about it...if the panels input... are feed from one side as most old panels are....an you can see when driven hard.....that the input side glows briter an more an more res....that means heat an more res...This will get the wire coating hoter at the input side.. than at the other end that is cut off...with this mod all the panels wire is driven eqealy....this in it self well show the interfaces a ezer drive... less res push back.....less heat on the interfaces an amp....there for more an better output.
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I don't get this, If in series they should be easier to drive, plus have more output, in parallel would make them harder to drive and difficult load for an amp.
The other thing is I've also had a few Acoustats, I have never seen them light up in the dark!! My 2+2's you can run them wide open in the dark with no covers on, there's no light show that you's talk about. I get 110db in a 33x80 foot room, and I think thats pretty darn good.
The other thing is I've also had a few Acoustats, I have never seen them light up in the dark!! My 2+2's you can run them wide open in the dark with no covers on, there's no light show that you's talk about. I get 110db in a 33x80 foot room, and I think thats pretty darn good.
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