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Infinity RS 2.5 Speakers Description - Need help connecting wires properly on woofers

I had the woofers refoamed and I can’t find the paper I marked down on where wires were before I disconnected them for repair!
There are 2 pairs of terminal tabs, one that is blank and one marked 2 ohms.
1 set of wires is solid red and black/red
1 set of wires is solid black and black/red

Can anyone tell me which goes where? I would be very grateful!

Also, I am preparing to sell them... if anyone has suggestions on best place to post. I don’t relish the thought of shipping them, they are VERY heavy and shipping cost would probably be prohibitive.

Thank you in advance, Peter
peterturoff
5 responses Add your response
erik_squires
15,670 posts
 
First, you can't damage them by going the wrong way. 

By convention, the crossover goes to the positive of a woofer.  That is, put a battery (+) to it and it pushes into the room. The (-) goes to ground.

This is convention, but not always true.  The way to tell is to measure or listen.  The inverted position should result in a missing band.

Best,

E
reubent
6,936 posts
 
http://www.infinity-classics.de/technik/manuals/RS_2.5_technical_sheet.pdf

http://www.infinity-classics.de/models/Reference-series-1+b-2-10+A+B-1981-86/Reference-Standard-2.5/body_rs_2_5.html

The RS2.5 has the famous, and outstanding, Watkins dual voice coil woofers. You likely would not damage them by wiring them incorrectly, but it does affect the sound (ask me how I know!). The links I provided above will show you the wiring diagram, with wire colors shown.

FYI, for all things "vintage Infinity", go to the Infinity Loudspeakers forum at Audiokarma.org.......

https://www.audiokarma.org/forums/index.php?forums/infinity-loudspeakers.129/

Good luck and enjoy.



erik_squires
15,670 posts
 
Just looked at that crossover.  A 2 Ohm coil in parallel with the 4 ohm?  I can only imagine what the curve on that looks like.

Classic Infinity. :)
erik_squires
15,670 posts
 
So I just simulated this using XSim and resistors for the drivers.

If the impedance magnitude is correct, and driver resonance is a good reason why it would not be, the two woofers in parallel without the switch being thrown go down to about 1.5 Ohms at 42 Hz.

Hopefully this is actually where the driver resonance is, because otherwise it's horrific.  The few actual impedance curves I've seen of Infinity speakers from the era have been horrible too.
peterturoff OP
1 posts
 
Thank you!
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