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Actually while the Original Infinity IRS Series V's are indeed a 3 way LINE SOURCE ( Tweeters, Midranges & Woofers with crossovers at 74 Hz and 4500 Hz ) the RS-1 and RS-1b are not.
The RS-1 and RS-1b are actually 6 way point sources, with the point source centered at the 3rd EMIM down ( and this single EMIM actually does 85 % of all the work of the whole speaker system - yes out of the great big RS-1 and RS-1b system you are almost exclusively listening to one 3 in x 5 in EMIM, all the rest of the speakers just supplement this one driver). Let me explain further.
The RS-1 and RS-1b's have crossovers at 150 Hz, 700 Hz, 3000 Hz and 8000 Hz.
The two woofer columns, each made up of 6 standard 8 inch woofers function below 150 Hz.
The top two, and bottom 4 EMIM's operate from 150 Hz to 700 Hz.
The 3rd EMIM down from the top operates from 700 Hz to 3000 Hz.
The top and bottom from tweeters operate from 3000 Hz to 8000 Hz.
The center front tweeter ( with the small CAP on the front ) actually acts as a Super Tweeter and only functions above 8000 Hz.
The rare tweeter operates from 3000 Hz on up.
So you see the original system has all these drivers but all the real work is done by the 3rd EMIM down from the top.
That is why if you put your ear right up to the drivers all you actually hear anything coming out of is the 3rd EMIM from the top, it is much louder than the rest.
Also as you turn up the system and play it loud, this is the driver that screaches and eventually if you tuen it up too loud it will blow.
I have even know people to catch this driver on fire, yes on fire.
Each crossover point introduces distortion, phase distortion, harmonic distortion and intermodulation distortion.
The more crossover points the worse this is, and since this speaker has a lot of crossover points, there is a lot of distortion, especially phase distortion with this design.
Also power handling capability is limited in this design because it is as only good as the weakest link, and in this case that is the 3rd EMIM down from the top.
To get any significant LOW BASS at all out of the Eight Inch Woofer Columns Infinity needed to introduce a BASS EQUALIZATION CIRCUIT which they incorporate into the unit they called a " Reference Standard Servo Crossover ". However this is NOT A TRUE SERVO unit as NONE of the WOOFERS are outfitted with an ACCELEROMETER so this " SERVO " supplied by INFINITY is not a TRUE SERVO at all. It can boost the LOW BASS, which would be putrid without it, but it can not correct for , UNDERSHOOT of the Woofers, OVERSHOOT of the Woofers, Harmonic Dirtortion or Intermodulation Distortion. A true Servo System with an ACCELEROMTER as seen in the INFINITY IRS Series V at least has one woofer with a true accelerometer and can at least partially act to correct these problems. Not so on the Infinty RS-1 and Infinity RS-1b Systems
Follow Ups:
I just have to chime in here!
First of all, You are right that the RS1b is a point source. That's the whole idea with its design!
Secondly, You are NOT only listening to just 1 driver. That's just stupid.
The rest of the EMIM drivers NEEDS to be many as they are crossed over around the border of their ability.
Also, if You are able to set a driver on fire, You are stupid SOB as You obviously have disconnected the fuse that is incorporated in the design for a PRETTY good reason and then overdriven it like crazy with a weak amp that has gone into distortion!
This goes for ANY speaker!!! Overdrive it and it blows!!!
What has power handling to do with ANYTHING AT ALL?
What You really want to know (it seems) is how loud can You play.
I can tell You that I have played beyond 114db at peaks from these speakers.
Quite enough for any human being that cares about their hearing ability!!!
What's this raving about the servo implementation on the bass columns not being servo???
You are clearly not educated enough to have any opinion about this as accelerator based servo is not the ONLY design that is servo controlled.
RS1b is servo controlled through EMF measuring.
Get educated and sort things out with Infinity before ranting like this.
You only come out as a stupid child.
Cheers and ease up!
The one who succeeded was the one who didn't know it was impossible.
I purchased the RS1B when it first came out in 1985. The electronic crossover was replaced by infinity just before they switched to the Beta. The original one kept shorting out. One Emit needed to be repaired and was by Bill Tahlmann at Music Technologies in Virginia ( I think he was surprised he could do it). Aside from the above the speaker still works perfectly and I have not found a replacement for it that has better dynamics, bass and flatter frequency response unless I am will to spend $200,000 ( large Alon). As Mike Kay at Lyric said to me two years ago - You cannot change the laws of physics i.e. if you want deep bass you need to move a lot of air. Many speakers are more transparent and have lower distortion but the dynamics and bass always kill the deal. With proper amplification these speaker will play very loud ( I use VTL 300 on the mid-tweeter panel and Perreaux 3150 on the bass columns). If you can find one on the used market in good shape I would grab it. You need a large room for them to blend properly. Sad to say we have not made much progress in the last 27 years unless you consider audio inflation progress. I paid $5400 for these in 1985. The Alons are $195,000.
I had a pair of RS1b's and the xovers were all redone with Wonder caps.
Still to this day they are one of the best set of loudspeakers I ever owned.
I totally enjoyed the music experience with the Rs1b's.
Im not sure what point you are trying to make with your post.
The post can be looked on as just informative as well
The xover used a low voltage input from the preamp right and left channel
and you would run OUT of your amplifier INTO the xover then OUT to the sub cabs. The xover compares the input from the preamp signal to the amplifier output signal and corrects the signal that goes to the sub cabs. Although there is not a physical accelerometer on one of the loudspeakers the method above does work.
"The xover used a low voltage input from the preamp right and left channel and you would run OUT of your amplifier INTO the xover then OUT to the sub cabs. The xover compares the input from the preamp signal to the amplifier output signal and corrects the signal that goes to the sub cabs. Although there is not a physical accelerometer on one of the loudspeakers the method above does work"
I think you just described a feedback circuit where the amplifier output signal is referenced to the crossover input. The circuit then sees the reverse EMF of the woofer as the later accelerometer circuit would. Since accelerometers had yet to be created for such a configuration, this was a very cool precurser. I have never heard these babies myself, but the RS Betas were a dream speaker in my early 30s. Ampzilla seems to has some sort of an axe to grind with this company. Time for him to come clean.
So what's your beef with Infinity? Accusations aside, the 50 / 50 point of a typical full range loudspeaker is 300 Hz. Most people would correctly state that the woofers take a ton more power to drive than the rest put together and are correct. However in real life, playing music, they aren't constantly making music. As freqs below 150 Hz are being dealt with externally in the 1Bs, you may be right stating that the the 3rd EMIM is pulling most of the weight in the mains. I say that as I recall a manufacturer of a large 5 way stating that one of the 7 inch drivers along with the soft dome were the speaker. That the drivers around it were for extension and image focus. Kind of like a mini monitor on steroids. Which brings me to, so how does or did it sound? And did this post have anything to do with that Arnie Nudel write-up in SP this month by chance?
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