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Atlantic Oracle 4

Glad you're enjoying those and they fit right into that room. :thumbsup:

I like the foam 'limiter' idea! :rockon:

I was going to suggest a sub to take some pressure off the mains. With most music you wouldn't need it but movie soundtracks throwing huge 20 Hz booms could push things to the limits.
 
Oracles, like the Dahlquist DQ-10s that they were 'inspired' by, like to have several feet of space around them; try moving them out from the back and side walls for a listening session, and you'll have an image that you can walk into.

If you're into modifications, you can easily rearrange the drivers on top so they are in a vertical line, rather than horizontal, but you'll have to make new top enclosures. Just wiggle loose the wooden bracket that they're all attached to, and turn it 90 degrees.
 
That's an interesting idea. I reckon the glass top wouldn't fit on anymore though.

Eric (stereocuuple) and I were talking about mirror imaging them - basically swap the lower mid and tweeter positions on one speaker is all it would take.
 
Suddenly, out of nowhere, there are three pairs of Oracle IIIs floating around out here. Two pairs are for sale, one pair, I'm still awaiting the owner to bring them over for a refresh.

I just may have to buy one of the other pairs.
 
HiFi in WYO said:
Suddenly, out of nowhere, there are three pairs of Oracle IIIs floating around out here. Two pairs are for sale, one pair, I'm still awaiting the owner to bring them over for a refresh.

I just may have to buy one of the other pairs.
Click to expand...

I Just picked up a set of Atlantis Oracle III"s
they are in rehab right now , recap and resistor's ect, they have seen better days but previous owner started a real nice restoration
im taking it the rest of the way. i remember listening to these speakers when i was 15 years old at Team Electronics. they let us put in a Pink Floyd tape to play a rif that we could never get to sound good on our crappy kids system. i couldn't afford them at the time but they have been a benchmark for me to reflect on how good a speaker can sound. times have changed but plugging those into my Pioneer rack will be a blast literally, from the past.
 
for reference Atlantis Oracle III
toxcrusadr said:
I know this is an Oracle IV thread, but someone suggested making it a general Oracle thread so: Here's a schematic of the Oracle III crossover which I am recapping right now. They may be the same as the IV which I can verify as I have both models.

View attachment 903019

Fairly standard crossover with a couple interesting points. The high midrange driver operates from its crossover point all the way up - there is no upper limit to its input. I expect it rolls off somewhere in the region where the tweeter takes over.

The low mid (mid woofer) has a 7.5 ohm resistor on it and that's the only resistor anywhere in the circuit. That driver must be a lot more sensitive than the others to require that much padding.

I don't know the value of the 3 iron core inductors yet. They are not marked and I don't own an inductance meter, so I'll have to wait till I get to another AKer's shop who has one.

I'll post more when I'm done with some restoration on these and the second pair of IV's. I'm putting Dayton metallized poly caps in for the 4 and 16, and electrolytics for the 50's.
Click to expand...
the schematic you have there shows the HM and LN wired in reverse polarity . all the pictures and even the 3's i have are wired polarity correct.
where did you find that schematic ?
 
Hey Gum, sorry I missed your post last Friday. The schematic was drawn by me, and it's entirely possible it has mistakes in it.
 
Question:
on the Atlantis Oracle III midrange speaker mounted in the cardboard tube, is it supposed to have speaker insolation stuffed inside of the tube ?
the speakers i have had them stuffed. it doesn't seem like they would build them that way . why go thru the hassle of mounting the speaker on a tube like that, then stuff it .
 
If you don't stuff a tube, closed or open, you have a quarter wave resonating pipe. Stuffing it dampens the resonances. Stuffed, if it is long enough, or if it has an open back, it acts like a transmission line - the backwave gets (mostly/theoretically) absorbed with no reflection.
 
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