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In Reply to: RE: Well, the reason for the extension idea is twofold posted by Mr_Steady on February 04, 2017 at 11:00:59
Thank you very much for an exhaustive and personally experienced reply. After all, there are no "truth" in this. Just different point of views, and a choice on whom to learn from.
First, to answer your question. No the Radian 750Pb has an aluminum -membrane.
Second, what you write about "You strain out a gnat, but you swallow a camel" is really what I needed to hear to get this horn extension ide a rest. I often get stuck in one specific detail, when I should discuss the whole system. I will later write down my complete system asking for advise where my weakest points are, and initially focus on them.
Btw, calculating with the horn cutoff (As PK did) as an acoustic filter sounds really like jeopardizing with the devil. A flapping membrane will surely put hard strain on the membrane surrounding even if not hitting into the driver dome. I prefer to handle this electrically with the filter. As I mentioned, I had settled on a 1īst order, 350Hz HP-filter for the horns. But surely there are more room for experiment here. Looking around, most people with similar setup uses higher order filters, which make me wonder if I turned back to my initially solution to easy. I have previously tried higher order passive, and active filters and also gone digital by using a miniDSP device. But after listening for months I always return to the simple solutions.
My experience of commercially driven gear is (as you described) that they are often far from optimized for their task, and that's why I seldom visit highend shows or hifi stores anymore. I prefer to learn and do it by myself. Ones avail I ask myself what is the goal of this hobby. For me itīs the craftsmanship, finding new ways to make things and understanding how (why) they work, more than the music itself. The feeling of turning (often cheap scrap) into good locking, well working gear gives me a good feeling.
Best
/Pix
Follow Ups:
You're welcome pix. I was just trying to point out some pitfalls that you have to remember are there. I think the truth lies in the fact there are a lot of right answers, because everybody has a slightly different need. For instance I don't know how loud you like or are able to play because of your living arrangement and neighbors. You might listen at a rather low volume, so your speakers are less stressed, and distortion or compression isn't so much a problem. You can get away with more. I was writing from my view point, which is I like music, and I sometimes like it loud. Usually in fact. I can get away with playing it loud, so I need my speakers to sound good at loud levels with low distortion. That's harder to do. I have to be a little more conservative. I am happy to say that I think I have a pair of speakers that play as loud as any home speaker you could wish, and it has incredibly low distortion. I really love the way they sound, and with only three and half watts! I think if any of the bad things I described before were happening with your speakers you would hear it.
Since you like the technical side and you have the miniDSP, then you should buy the calibrated mic for it. As DIY as you are you will need to test your horn and woofer. You may be using the old tried and true passive xover calculations. Try finding a program that helps design an xover with a flat impedance. ALK Engineering sells xover design software. It really makes a difference with SET amps. Trust me on this one. If you don't mind active xovers then try one of the Marchand active xovers. I can't recommend them highly enough. They really are great, and they have little pc cards to change the slope and type of crossover. It makes it very easy to try different arrangements. Symmetrical, asymmetrical, anything you want.
Lastly a conservative recommendation for your set up might be a second order slope at 500Hz, if your woofer goes that high. Third order slopes are good for horns, and at least they actually do something, unlike first order slopes. First order slopes are good for direct radiators generally, or direct radiator only speakers I should say.
I hope you get to a point where your technical side and the musical side come together for you.
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Big speakers and little amps blew my mind!
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