RS-4.5 Variants

Unlike many manufacturers, Infinity was continually upgrading and changing their speaker designs during the lifetime of the product. The goal (I suppose) was to incorporate feedback from customers into the latest version of the product. This can sometimes lead to some serious confusion when trying to figure out crossover designs, specifications, etc.

In addition to upgrading versions of their products, Infinity would also customize versions of their speakers to individual users. Nowhere was this more evident than in the RS-4.5 line. Despite only producing something like 300 sets of 4.5s, here are various examples of custom or modified RS-4.5s. 
(Photos courtesy of Vito).

RS4.5 Others

Here’s a “standard” pair of RS-4.5s for comparison. Note the EMIMs and EMITs offset to the side, and black acoustic foam on the remainder of the upper baffle. 
Infinity Reference Standard 4.5 Tampa (Large)

Here’s a custom pair. Note the wooden V-notch cut into the black acoustic foam. I’m not sure what that does for the sound, but I sure like the looks of it. 
Infinity 4.5 Center

Here’s another custom set. Note how the EMIMs and EMITs are centered (not offset) in the upper baffle. I have been told that these were custom-designed for
tri-amplification, but I don’t know any other details.
Infinity RS 4.5 Special Version 6
Infinity RS 4.5 Special Version 3

Here’s the most radical custom set I’ve seen. This looks like a design precursor to the IRS Beta/Gamma/Delta, with the cut-away upper baffle.  Note the horizontal EMIMs, like in the Gamma/Deltas. I’m not sure what that does for the horizontal dispersion, but it does give you a wicked looking speaker.

If you have any other non-standard Infinity designs, I’d love to get some pictures! 
E-mail me at david@davidsaudio.com

Contact me at: david@davidsaudio.com

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