@larryi wrote:
A local builder uses quite sizeable horns and compression drivers that can go extremely low. I recently heard a system where the crossover from compression midrange to woofers was set at 180 hz with a very shallow 6 db/octave slope. The compression drivers were quite pricey, and if this were my system, I would insist on a higher crossover point and/or a 12 db/octave slope.
That sounds extreme. I’m not aware of compression driver that goes that low, let alone comfortably (not least with a 1st order HP!), but there may be some field coil drivers to challenge that. The permanent magnet JBL 2490H is a 3" exit compression driver that can be crossed at ~300Hz without any issues, and the Community M4 is a 4" exit and ~40 pound beast that can be high-passed at 250Hz. Both have a sensitivity around 115dB’s and 200W continuous power handling, so about the ultimate in high SPL pure midrange compression drivers around.
And definitely; on the face of it I’d use steeper slopes as well in the context lined out by you, in addition to raising the crossover frequency.
@devinplombier wrote:
Thank you for your response. Your point about "hifi" bass and what it is / should be about is well taken. I do agree in principle, but I do like some slam too, and I’m not resigned to the two being mutually exclusive.
It’s not that the JBL K2’s don’t have "slam," far from it, but it’s the way they do bass overall that’s interesting and that differs from the typical low efficiency segment of "hifi" speakers with smaller woofers. Where I heard the K2’s I didn’t find them to be anemic in the upper bass/lower midrange per se as pointed to in another post, but rather what struck me was the coherency into the power region here, and how the bass was more articulate, tactile and less "bassy."
In any event, I was curious about this:
"to those of us who are not bothered by larger size and that dare to look outside the accepted brands, hifi segment and high price dogma, not to mention embracing actively configured speakers, there are even better options out there - and cheaper to boot."
Wondering if you would care to elaborate on some specific options you have in mind? Thanks!
A pair of active Meyer Sound Acheron 80/100 cinema series speakers are a more refined sounding package than the K2’s and Everest’s, and they’re cheaper - even with built-in amps and crossovers. Pair them with the dual 18" Meyer Sound X-800 subs and they’ll run circles around the Everest’s in every regard, still being the cheaper solution. A pair of Stage Accompany M57 speakers, outboard actively configured and with high efficiency subs will leave the K2’s behind in quite a few respects, while being much cheaper. A pair of dual 15"-loaded, actively configured ATC SCM300ASL Pro are great speakers, and cheaper than the K2’s even with ATC outboard amps and crossovers. My own setup of outboard actively configured EV cinema speakers with large format horns, JBL alnico tweeters and tapped subs do things a pair of K2’s and Everest’s can’t equal - way cheaper, and yes, you’ll have to take my word for it. Vitavox Thunderbolt and Black Knight systems, outboard actively configured and horn subs augmented are dynamite setups. There are many more solutions, but what goes through it all is that they’re actively configured.