This is a review and detailed measurements of the Selah Audio vintage RC3R 3-way speaker. It is on kind loan from a local member. From what I can tell, the Rc3R came out around 2003 and it cost full built for around US $1,300. Kits were available for half the price.Please excuse the poor mobile phone picture as the unit is still on the measurement stand:The cabinet seems quite solid and finish nice.As you can tell, it is a 3-way design. Here are the specs for the drivers which I had a hell of a time to find:(1) Scan-Speak 18W8545(1) Morel MDM-55(1) ATD LeRibbonI am only going to present the measurements as I have to rush to our audiophile society meeting where I can return this and other speakers to their owners.Measurements of the Selah Audio vintage RC3R were performed using the Klippel Near-field Scanner (NFS) . This is a robotic measurement system that analyzes the speaker all around and is able (using advanced mathematics) to subtract room reflections. It also measures the speaker at close distance ("near-field") which sharply reduces the impact of room noise. Both of these factors enable testing in ordinary rooms yet results that can be more accurate than anechoic chamber. In a nutshell, the measurements show the actual sound coming out of the speaker independent of the room.Acoustic measurements can be grouped in a way that can be perceptually analyzed to determine how good a speaker can be used. This so called spinorama shows us just about everything we need to know about the speaker with respect to tonality and some flaws:We see good integration between the drivers as the on-axis curve (black) is mostly smooth. However, it is rising up in level as frequencies climb to 20 kHz. As a result this speaker should sound rather bright if you full absorb the reflections.Digging into the directivity indices gives us this:Two observations are apparent as noted on the graph. The early window directivity index (dashed blue) at a glance tells us how similar the on-axis and important reflections are. If the two were identical, the graph would be a flat line at 0. If it is rising, it means that the highs are rolled off relative to on-axis/direct sound. This is fine and a good thing. What is not a good thing is if you see variations along the line. And that is what we see. This means that the sound that bounces from surfaces around your room will have a different frequency response than what you hear. Speakers like this tend to not do well in controlled, preference testing.The above also means that the sound that you hear will be room dependent with respect to what absorption there is at various angles to the speaker. Block some of them and the overall response/tonality changes even though the direct response is not changed. Such kinks also cannot be fixed with EQ because they occur in the room, not upstream of it.Looking at an estimate frequency response you would get in a typical room we get:So depending on what you play, the tonality of the music is changed a lot. An ideal response would look like the arrow I have drawn.High level analysis is done at this point. All else being equal, this is not a speaker you want to buy.Speaker is spec'ed at 5.5 ohm impedance with lowest at 4.5 Ohm and we have that more or less:I have to run to the meeting!!! So here are the rest of the graphs for you all to chew on:"Spin" data is enclosed.We have been "unlucky" in starting our measurements with more recent designs which are more or less following what is right in speaker design. Good to go back in time and look at a speaker that while not terrible, doesn't follow the rule of having good "off-axis" sound. Hopefully this helps calibrate you all better in what to look for in these measurements.------------As always, questions, comments, recommendations, etc. are welcome.Have to drive 150 miles roundtrip to the meeting and to return speakers to owners. Hopefully that makes you feel sorry enough tousing