Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums > LAB Subwoofer Forum

Radian Audio Engineering's 2218 Neo Driver: Absurd Claims or Not?

(1/8) > >>

Mark ☻Bass Pig☻ Weiss:
After owning a half dozen EVX 180Bs for 9 years, I've done my periodic "let's see what the state of the art is now" lookie-loo and happened across a company called Radian Audio Engineering and their 2218 Neo woofer.


To make things clear, I'm not using these in a subwoofer application, just mid-bass from about 30-130Hz.


I read over the data sheet for it and some things don't add up. Rather, the claims read like a wish list for the magic genie.


Radian has two flavors of 18" driver. One has a big ferrite magnet and rather 'meh' specs, similar to most every pro 18" out there. SPL measured not even in the bass range, but around 400-500Hz, and is down about 30dB by 20Hz.


However, the 2218 neo's SPL is specified at 32Hz, and the response graph is the flattest I've ever seen for any driver. From it's output level at 100Hz (102dB @ 1W), it's output at 20Hz is only down 5dB. They claim 101dB at 1W 1M at 32Hz. Most pro 18's are down around 70dB at that frequency.


In other words, the acoustic power output at 20Hz is about 500 times greater than the ferrite magnet driver of the same size, according to the response graphs calibrated in SPL with 2.83V input. I'm having serious trouble believing that graph!


However, the Qts, Qms and Qes figures are very low, and the Xmax is about 3.3x more than many of the best pro 18" drivers.


The interesting thing is that it's got about 50x as much neodymium magnet mass as anything I've seen on the market from TC Sounds and other companies, which have maybe 6oz of little neo bar magnets inside a pot core. This has two big slabs about 3lbs each, about the size of a ferrite magnet, but neodymium. It's possible that the magnet system could be in the neighborhood of 100,000 gauss with all that neo.


I'm contemplating buying one and testing it against the EVX 180B to see if it's really THAT much better, or if it's BS.


Has anyone had any direct personal experience with this Radian 18" woofer? Not the ferrite version, but the Neo version? Would be interested in hearing your impressions and any measurement data you may have taken.

Craig Hamilton:
Those are some crazy specs. I think the marketing department got ahold of that frequency response chart. I'm still a big fan of the 18 Sound 18NLW9600 that PK sound and Danley uses as well as others. The new RCF LF18X451 has some impressive specs as well.

Mark ☻Bass Pig☻ Weiss:

--- Quote from: Craig Hamilton on April 14, 2015, 12:27:14 am ---Those are some crazy specs. I think the marketing department got ahold of that frequency response chart. I'm still a big fan of the 18 Sound 18NLW9600 that PK sound and Danley uses as well as others. The new RCF LF18X451 has some impressive specs as well.

--- End quote ---


Yeah, very hard to believe. I put a call into Radian, but the engineering people had already left for the day, so they're instructed to call me back the next day.


To their credit, the non-neo version has very down to earth specs, so if they are using the same yard stick to measure both, then the neo is SOME driver.


I also contacted one of the sellers of this driver, US Speaker, who answered and said that the claims are accurate.


At any rate, I hope to have a lively conversation with the engineering people this week. If I get the right kinds of answers, I'll invest the $800 or so and try one of them, with a direct comparison of sweeps and SPL at various power levels, to the EVX180B. If it's all good, then I'll have six 180Bs for sale on eBay soon. :)

Scott Carneval:

--- Quote from: Mark ☻Bass Pig☻ Weiss on April 13, 2015, 04:00:33 am ---
To make things clear, I'm not using these in a subwoofer application, just mid-bass from about 30-130Hz.


--- End quote ---

You have an interesting perspective on the definition of a subwoofer haha.  To be clear, I like my bass just as much as the next guy, but you're implying that your 'subwoofer' is a sub-30hz cabinet? 

Steve Bradbury:
The calculated sensitivity figures come out less than the 101dB @ 32Hz



The green plot is for a cabinet of 243ltr tuned to 32Hz as recommended in the data. The blue curve is for a 120ltr tuned to 45Hz. The red is a comparison of two 12" Ciare1200W drivers in an 80ltr cabinet tuned to 46Hz. The latter is a design I have real measurements for.


The next image shows the calculated max spl.



Navigation

[0] Message Index

[#] Next page

Go to full version