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Would love to get in on the discussion, but we just got walloped by Irene and have been without power for the last day. Even the cellular data network is pretty much totally down. Hopefully back online tomorrow...
Hi Jim,I've updated the site a bit, but if you have any questions, you can e-mail me at soundfield (preferred), or pm me here. Thnx
Very well thought-out topology, congrats on obviousy getting the details right, judging by the listener comments.Just visited your website; I expected the price to be three times what you're charging. You are offering a superb value, AJ. I hope the marketplace rewards you for it.Duke
Again: Definitely a design that makes one wonder why we haven't been buying and listening to it for years already. I suppose one reason is the more recent widespread availability of lower cost plate amps with built-in Xo to the DIY community. I could see this becoming a great industry trend if not maybe even a standard. Let us now officially christen this (powered bass/passive mid/treble) the "AJ" topology...or insert better label here.
Your philosophy has much better potential for success and acceptance in high-end than fully powered monitors. In pro audio fully powered makes some sense because higher SPL is more desirable. In high-end, we likes our favorite amps for mid/treble much more than low cost digital amps for this range. Smart!
So AJ (sorry if covered elsewhere): is there a passive high-pass mid crossover? What is low-pass bass pole? Is low-pass bass pole tunable?
Also, kudos for highlighting the bass-mode flattening power of employing a sum total four bass sources in the room (your two speakers + two subs). As you mention, the mains in this case, the SFAM1, should absolutely run the powered bass driver full range and NOT be high-passed, resulting in more smoothing effect of the bass modes. This is anti-intuitive for audiophiles not familiar with this technology, which Duke has long espoused and promoted.Two bass sources attached to the mains results in less smoothing than locations other than the mains (IOW four discrete subs), but there is still great potential benefit. I'll send a PM that may help in dual sub placement with your apparently fantastic new speakers.
James, I don't follow you. Are you saying not to high pass the mids (or coax in this case) or not to high pass the bass drivers? I don't have SAM1's but in my speakers I high pass my monitors at 150hz and use subs to cover frequencies from 150hz on down. The system sounds much better than it did when I was running the monitors full range.
It's really cool that users can toss together even a passive sub and power it with his plate amp!
One quick note, due to warranty issues, the slave output off the amplifiers is not an option right now, until further notice.
Hi James,That would be a huge stretch, given the Infinity Overture 1's and even Neeko's DefTechs, which feature powered subs.
The niche I wanted to fill, is what I've seen in about a 1000 threads, something along the lines small/bookshelf that doesn't need a sub...followed by 1000 responses of "try this 5.25 - 6.5 inch 2 way"...huh??? How on earth is a 6.5" driver going to displace the necessary air for subwoofer frequencies? (physically impossible). Why would you want you midrange driver producing those sort of excursions? (you don't ).
I am convinced that many people just don't like the sound of real bass
I thought from AJ's earlier post in this topic that the passive slave output was not an option at this time: Steve
Mike, I mean Tyson...What concentric speaker ya'll sleepin' wit in da ghheto lately?
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