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Letitroll98 asked “what would you think about the Allison dome midrange used in Roy's model One through Three speakers?” Cannot should not comment as I do not recall ever hearing an Allison speaker, perhaps no Midwest USA dealers. I do recall uniformly excellent reviews, admiring Roy Allison’s bass interaction work leading to placing woofers at floor level to eliminate the node caused by woofer center distance some distance above the floor.
The main thing that concerns me is the driver selection and x-over design required for the woofer to midrange... Ideally I want a 10-12" driver that extends down to 30-40Hz, but also needs to be capable of reaching up to 400-500Hz, cleanly for a dome mid? (impossible?).Above all, I want drivers that require the least amount of parts. Any suggestions or direction here would be appreciated.Looking at some of the specs on the Volt 753, it's claimed to have an fs of 400hz which would mean you should be crossing at least 1.5 times higher than that if my memory is correct, so closer to 1000-1200. i'd also look at the Bliesma's for the upper range, I've been playing with the 34B here for a bit and it's simply outstanding!! I'd also ponder 2-Purifi's on the lower end as they would allow you to keep the baffle width smaller but still easily hit the 30-35hz lower range, in fact I have a pair here that i'm going to put in my box today to see how they sound.So many drivers, so little time!!Yesss Dom!! I've been looking at the Bliesma's... First impressions I'm blown away. I've ordered a couple to measure and I'll post the results in this system. Thanks so much for the pointer.Don
If you want to invest full resources into a true three way project, I don’t think you will best the ScanSpeak 4” Illuminator mid. The crossover, tweeter selection and baffle design will take some effort for best results. But I don’t think you will find a better sounding mid at any price.Enjoy the process.
I thought you could get a Yamaha piano for $15K.... Guess not. Among the brands that audiophiles 'love to hate', I always thought Yamaha had decent sound and a nice design aesthetic.
Looking at some of the specs on the Volt 753, it's claimed to have an fs of 400hz which would mean you should be crossing at least 1.5 times higher than that if my memory is correct, so closer to 1000-1200. i'd also look at the Bliesma's for the upper range, I've been playing with the 34B here for a bit and it's simply outstanding!! I'd also ponder 2-Purifi's on the lower end as they would allow you to keep the baffle width smaller but still easily hit the 30-35hz lower range, in fact I have a pair here that i'm going to put in my box today to see how they sound.So many drivers, so little time!!Don
FWIW not all Allisons had the woofers at floor level. My Fours (bookshelf) and CD-8's (floorstanders) had the woofers on the top of the cabinet. It was an intricate 'matrix' of driver layout, crossover points, and positioning (they all were designed to be against the wall) that made it work. I sold them and still regret it. BTW the current Larsen speakers are a very different approach to solving the same problems but share the tactic of positioning close to the wall.
Seriously while we’ve been having this discussion my Instagram feed; the AI of which knows I like classic Hi-Fi, fed me a picture of the JBL XPL-200A a 4-way featuring tweeter – dome midrange – cone lower mid – and 12” (because JBL) woofer. I fancy myself a JBL aficionado and this model is a new one on me.
