So, basically replicate what was done in the Kappa 9s with the polydome.
Infinity RSb reincarnated
- Thread starter jefferylhenr
- Start date
So, basically replicate what was done in the Kappa 9s with the polydome.
jazzmans
Super Member
yep. I forgot about that. Been a while since I've had a pair of kappa 9 around.
I am going to BI-amp them and this is how I have them set up as a prototype.
Will affix the rear grills with Velcro
jazzmans
Super Member
But they did start as RSb, so IMO, the title still fits.
@jefferylhenr I am really enjoying this thread, and your efforts.
@jefferylhenr I am really enjoying this thread, and your efforts.
If I start another project like this, I will design a removable rear panel for the crossovers so they are more easily accessible for value changes. And for the question of is this still an RSb?, sure it is. If you take a 1978 Porsche 911 and replace the body with carbon fiber and add twin turbos and upgrade the engine management and along with the suspension, it’s still a 1978 911 - of course it is. Now if the drivers were completely replaced, maybe it starts to be something else. I considered trying some audax mids, but these infinity poly mids with the butyl rubber surrounds are sweet and the redesigned enclosure turned out way beyond expectations.
With the rear emits permanently mounted. The hole is not a port but the 0-5 ohm variable resistors from a set of RSE’s
Almost forgot, I biamped them as well. With the emits and mids fed from the top binding posts and the bass drivers from the bottoms.
These are the values I ended up with for the rear emit high pass. Basically mimicked the kappa 8/9. I upgraded the parts from the earlier picture - replacing the ferrite core inductor With an air core jantzen, Dayton 1% resistors and replaced the 2.5 ohm fixed resistor with a variable 0-5 ohm 5 watt from a scrounged set of RSE that I got for $10.00...
jazzmans
Super Member
Nice job, especially with the cork around the rear emit. have you given any thought to dampening around the rear speaker grill?
The very last generation Infinitys used foam all around the rear firing emit to catch stray reflections, I assume.
Seriously, fantastic work, man.
The very last generation Infinitys used foam all around the rear firing emit to catch stray reflections, I assume.
Seriously, fantastic work, man.
That was the idea with the cork and the same on the front to help with a certain bit of dampening. The rear emit grill frames that a built out of polypropylene flexible pipe have Velcro around the backside. It’s quite fuzzy on one side which breaks things up a bit along with the grills themselves.
They are 4 ohm or lower @ 150 watts in their original configuration and I understand they can go much lower than 4 ohms on occasion. After adding the additional rear firing tweeters and crossover Components I wanted better headroom for the bass woofers and lower distortion on the top end. BI amping also allows the use of amps that are better suited for the woofers and vs the mids and tweeters. I have a 240 watt high current sonance driving the woofers that can handle down to 2 ohms and a 160 watt Denon with a lower distortion curve that tops out 100,000 hz for the rest. Besides it was winter, what else is there to do when the snow is flying?
Now that these Reincarnated Infinity RSb's have settled in after almost 12 months, with the rear firing emit Kappa tweeters, they have become my daily speakers... Now what for my next project?
jazzmans
Super Member
considering the stonkin' job you did with these, maybe consider a full size TOTL infinity tower, a-la RS II, or Kappa 9, or IRS delta/gamma?
Or are you looking for a totally different speaker design?
Maybe a KEF type dual concentric tweeter/midrange, with woofers....
the possibilities are endless with your skills.