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  3. 128645-95074

Anyone know what these are

I picked these up at an estate sale recently, and am wondering if anyone can explain their purpose. They weren’t hooked up when I bought them, but the estate included a high-end Linn / Legacy / Conrad Johnson system, so I thought they might be interesting.

Circuit looks like a capacitor, a few resistors, and a wound spool of wire, all on a basic switch. There are two of them. Guessing maybe some sort of filter that goes between an amp and speakers? Thanks.

https://www.flickr.com/photos/etcworld/albums/72157677429583333
tce5280
jafant
18,802 posts
 
Cool pics- a proto type or DIY project?
erik_squires
15,647 posts
 
Without being able to see all of it, it looks like a speaker level low pass filter, with a  bypass switch.

I can't tell if there are also resistors or caps involved. However, if it's just an inductor in series, that's what it is.

Best,

E
erik_squires
15,647 posts
 
OK, so it's a little more complicated. It looks like there are 4 resistors, which I assume are in series with the coil.

Not sure what the switch will do exactly. It could bypass everything, or just the resistors, or just the coil.

Was this system using horns/pa type of setup? if so maybe the user was experimenting with the bass configuration.

It is probably very cabinet specific, and my guess is it was more of a hack/experiment.

Best,


E
dill
2,424 posts
 
Does the other one (not pictured) have a red or black binding post? Are they identical inside?
erik_squires
15,647 posts
 
I don't see any capacitors involved. Since there is only one in and one out, it's safe to say the entire circuit is in series. Nothing shunts to ground. Therefore the circiut is something like this:

0---vvv-vvv-vvv----uuuu---->

with "vvv" representing a resistor and "uuu" representing a coil.  "0" and ">" representing the input and outputs.

Somewhere around there the switch bypasses some or all of it.

Clearly someone was playing with a bass cabinet somehow.

Best,

E
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