I’ve been evaluating a couple of samples of the PS220-8, and have designed a MLTL enclosure for it, along with a contour network to provide acceptably flat on axis response.
More details will be forthcoming as they become available, but the short story is: Sexy looks, and pretty decent performance.
There is a thread over at PE.http://techtalk.parts-express.com/sh...d.php?t=220356
Here are my observations thus far:
Fit and finish is excellent, my ad hoc distortion measurements were generally well behaved, and suggest it does quite well in that department. The consistency between the two samples T/S paramters and response plots were excellent, but are somewhat different than the published values. This may suggest some differences in the production run vs. the published specs.
Two other observations:
The phase plug terminates in a sharp point. Use caution around children and other living things. –On the plus side this should tend to protect the wizzer cone.
The magnet assembly is quite massive for a neo. I made the mistake of setting one of the drivers on my test amp, and played bloody hell trying to extricate it. -Some serious magnetic mojo going on there…
What’s a crossover guy doing with FR drivers? Good question. I’ll try to come up with a plausible explanation…
The high sensitivity is intriguing, as well as the minimum phase characteristics. I saw it as an excellent opportunity to see what this high efficiency design hubbub was all about. –And of course I can’t just touch it without doing some sort of passive manipulation of the response…
In spite of the low Q of the driver, I was able to model good low end extension with this driver in a MLTL enclosure. Wayne has again graciously consented to placate my desire for large enclosures and build the prototypes. -But even Wayne needs some time to work his woodworking magic, so currently they are undergoing preliminary voicing while residing in an old pair of 2 way enclosures I had on hand.
How do they sound? Pretty darn good. With only a simple shelving network applied I get a nice pleasing sound with few, if any, audible artifacts. The high frequency extension is quite good on axis, but as would be expected, falls off significantly off axis. Definitely these want to be toed in toward the listener, but the sound in the sweet spot is quite acceptable, verging on excellent. Pairing these with a gainclone or low power tube amp would be the obvious match, as only a couple of watts will push these to quite high SPL’s.
-High fidelity on a shoestring budget…
Stay tuned: The enclosure design and filter network will be ready for dissemination shortly. At roughly 3ft^3, it’s not a diminutive design, but still a reasonably sized floorstander. A hundred bucks may seem a bit steep for a single driver, but when you consider the shelving network will only run about ten bucks, it’s pretty decent for a speaker which will provide an f3 below 40 Hz, and an SPL of 107 dB on only 20 watts.