I hope Lukeamdman doesn't mind my posting this here but I thought it would be good to revive this thread based upon this quick review by an avid DIY'er. There have been several disparaging comments from the DIY "bubble" about the Orbit Shifters and all of them have been anecdotal or based upon a misinterpretation this one posted graph ^.
I would like Jeff to send an OS to Josh for testing but that is a big deal and not an inexpensive proposition for Jeff. These subs are what they are (profound no
) and having heard many alternatives they remain my favorite option. It was good to have someone with quad sealed LMS 5400 powered by uber amps give his honest and unbiased take and I'd like to extend my thanks to Luke for doing so ...
Originally Posted by lukeamdman
RMK was gracious enough to give a demo of his system tonight. I was in the Sacramento area for work and sent him a PM.
There were two things I wanted to hear, and both happen to be JTR products… The Triple12, and the OS. It just so happens, he recently sold the T12s and has bran new Neosis for LCR. Even better!
First off, his theater room is awesome. Aesthetically pleasing, spacious, great acoustics after what he’s done to it, and the AT screen is just beautiful. My theater room, called “the dungeon”, or “the scary room” by my wife, looks even worse now, and that shouldn’t be possible. Thanks a lot, Rob…
Anyway, on to my impressions, and I think Jeff did a fantastic job with the Neosis. I’ve been dabbling in the DIY world, most recently working on building crossovers, and for the 12s in the Neosis to blend in as well and they do with the CD, Jeff is really doing a quality job with that crossover. Just amazing. I don’t want to guess as to how many hours he put into R&D for the crossover for this speaker! Highs were crisp and clean, not harsh, and the mids blended seamlessly and were very detailed. At several points in the demo Rob exceeded +5db in the main volume, and Neosis didn’t even blink. Never sounded strained or distorted ever.
As for the bass, I feel I’ve heard the best of what’s out there, and I wasn’t expecting to being impressed by two 18s, regardless of their configuration. I was definitely wrong! For starters, the obit shifters are HUGE. Pictures don’t paint the whole picture here. Second, having never heard a horn loaded sub before, they do have a “unique” sound to them, and I’m saying that in a completely positive way. Great punch, great detail, and great sub 20hz response and tactile feel. I know for a fact that at certain points in the demo the orbit shifters exceeded 125db, and they did so effortlessly. Considering I have quad LMS 5400s and 16kw worth of power feeding them, I didn’t expect two 18s and half the power to accomplish what they did. I may have to build four “gjallarhorn” enclosures for my 5400s now
Thanks for the demo, Rob!
And, this post in the DIY Section:
A trip over to RMK’s place a couple days ago got the wheels turning. Long story short, two JTR Orbit Shifters, which combined is two 18” drivers and 8kw of power, gave my quad 18’s and 16kw of power a run for their money! To be more specific, I feel his setup had greater output above 30hz, and mine had greater output from the mid 20’s on down.
The efficiency of the horn design definitely impressed me, so I started to look around. It didn’t take me long to find the GJALLARGORN on Ricci’s data-bass.com. From his measurements, just one gjallarhorn will outperform all four of my sealed 5400s from 16-40hz-ish, and obviously with far less power.
The plan is two build two of these, and re-use two of the 5400s from one of my sealed cabinets. That means I’ll still have two other sealed 5400s powered by a LG clone, which can help cover the top 60-80hz portion where the gjallarhorn may need some help. The only investment for me is the cost of the wood.
Ricci already emailed me the detailed plans, so all I have to do is find 4x8 sheets of quality Baltic birch and I’ll get started:)
Point of this being that hearing the OS's prompted this fellow to want to build a couple of Horn based subs using two of his super drivers that are currently installed in a sealed cabinet he built. I admire his abilities and understand Luke's priorities. For some of us, just buying something that performs at the level of the OS's is the best course. In any case, this just provides a bit more information for someone looking for a sub like the OS.