Infinity RS 2.5 speaker placement

I had a pair of these and was also puzzled over room placement.

The owners manual gave little guidance. You can get one at the Infinity Owners group's library at Yahoo. Might be worth joining.

They are a complicated design. The 2 EMIT tweeters on each speaker are out of phase and pointing front and back or dipolar.

The single EMIM mid-range is open to the back, so they are bipolar.

And while the 15 woofer looks conventional, except for the clearish poly cone,, it has 2 windings and the cross over is designed to have a different resonances for each.

The woofers are not very efficient, so there are resistors in the mid and tweeter circuit to waste power and equalize response. And several switches to set levels.

I think that the low efficiency of the woofers encouraged owners to turn their amps up until they clipped, there by frying the EMIT and EMIM units. The speakers are set up for biamping and I would recommend it to isolate the woofers and possible clipping.

Be real careful handling the upper covers, the frames are really easy to break.

As to room placement, it didn't seem to matter as much as some other designs, but I liked them 3-4 feet from the back and side walls.

(It has been a couple of years since I had them, so some of my details might be a little off.)

They are actually Watkins Engineering 12" dual drive woofers. It is a dual voice coil woofer with one 4-ohm coil and one 2-ohm coil which play at different frequencies. I replaced the originals with exact replacements from Watkins Engineering themselves. I have never come close to clipping the edge, as it will deliver 900 watts continuous into 2 ohms and I have no idea about the transient power ability but I'm not interested in biamping. The system is already more than loud enough. Besides, $15k for another comparable amp is way outta my budget.

Both sets of upper grills were pretty much hammered when I bought the speakers, so a rebuild project is in order sometime in the future.

Also there are two emits and two emims per speaker plus the one twelve.

And I do have a copy of the owner's manual, but thank you.

I own RSIIb's as my main speakers. They have more drivers than the 2.5's so take this with a grain of salt, but I find that a slight toe-in works best - I cross the tweeters a couple feet behind my listening position.

If you intend to keep them you should look into the new EMIM diaphragms offered by Apogee Acoustics in Australia - I have them and they sound incredible, like an electrostatic with 10X the dynamic range.

I will have to look into that. Did you replace the Emits as well?

He doesn't make EMITY diaphragms, yet...

Here is a link to the Apogee forum - Graz is the owner, and he is taking pre-orders for his next production run. His first run of 60 sold out.

http://www.apogeeacoustics.com/forum/viewtopic.php?f=15&t=187

They are really a big upgrade in sound over the original mylar units and should last longer, too.