I also used the Aura 2" and was not very satisfied with the sound. But it was a weird environment. I think this driver needs EQ-ing and maybe notch filters. But the drop in high freq was not very disturbing for me. It's not too bad to loose a third octave band at 20 000 hz (it is not a good thing but it's not REALLY bad)
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Gary,
Good point about the need for a notch filter on the Aura tweeter. SL's amplification section for the Pluto shows a 5 db deep notch filter to correct the tweeter response between 2 and 7 kHz.
It certainly is easier to implement this type of correction in an active EQ rather than attempt to do it passively. The amp then does not have to drive the combined drived /passive EQ impedence and control the driver. Another plus for going active rather than passive, at least for this application.
Good point about the need for a notch filter on the Aura tweeter. SL's amplification section for the Pluto shows a 5 db deep notch filter to correct the tweeter response between 2 and 7 kHz.
It certainly is easier to implement this type of correction in an active EQ rather than attempt to do it passively. The amp then does not have to drive the combined drived /passive EQ impedence and control the driver. Another plus for going active rather than passive, at least for this application.
I agree with Linkwitz, that omnipolar speakers offer a lot of the same benefits as dipoles and speakers with controlled directivity. My home speakers are a very well done controlled directivity design.
This evening I was at Costco, and noticed a humble JBL speaker for $50. I bought it, measured it, and review it here:
Audio Psychosis • View topic - Fifty Dollar Speaker Review
The reason that I mention this in a thread about the Pluto is that the JBL is designed to be arrayed like a donut:
This could make for a very interesting high-efficiency omnipolar speaker.
I've listened to the B&O omnipolars, and they're very very good. Check out the review of them from The Audio Critic, he bought the review pair.
Omnipolar speakers are neat, though difficult to do.
This evening I was at Costco, and noticed a humble JBL speaker for $50. I bought it, measured it, and review it here:
Audio Psychosis • View topic - Fifty Dollar Speaker Review
The reason that I mention this in a thread about the Pluto is that the JBL is designed to be arrayed like a donut:
An externally hosted image should be here but it was not working when we last tested it.
This could make for a very interesting high-efficiency omnipolar speaker.
I've listened to the B&O omnipolars, and they're very very good. Check out the review of them from The Audio Critic, he bought the review pair.
Omnipolar speakers are neat, though difficult to do.
Would this be a good idea to try on Pluto's? A wedge to lessen the back radiation a bit?
German Physik seems to use wedges to "filter" out some of the 360 degree backwave. German Physiks - High End Technology Loudspeaker Manufactur - DDD Driver - Products
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
German Physik seems to use wedges to "filter" out some of the 360 degree backwave. German Physiks - High End Technology Loudspeaker Manufactur - DDD Driver - Products
Nobody? This is from the "wedged" German Physik loudspeaker manual, seems the wedge works to allow wall placement. I know omnipolars are obscure, would be nice if somebody had experience with "wedges" on omnipolars.
An externally hosted image should be here but it was not working when we last tested it.
thru all this thread nobody has listened to these speakers. in the build better for less you can order the speakers for $241 at madisound. currently building a pair cause they are different
And I am repliking the new version the LX-Mini which are said to have the realism of the LX-Monitor with very few drawbacks in the SPL and extension in both directions.
http://www.diyaudio.com/forums/multi-way/264603-linkwitz-lx-mini-passive-replica.html
My point would be that a "wedged" Pluto could have some LX-mini room placement characteristics... My personal diy experience with omnipolar is 3 inch fullranger + styrofoam ball... long time ago not quite up with the German Physiks enginering 🙂
I am intrigued by the idea of Linkwitz's (and others') designs and commenced to build a very simple and cheap omni full ranger I dub the "Polluto" because of a superficial resemblance to the Pluto 🙂
The thread is else where, but each speaker costs perhaps $10 in parts, using this driver:
http://www.parts-express.com/grs-4f...eaker-pioneer-type-a11ec80-02f-8-ohm--292-434
They are not even worthy of the term "Polluto," perhaps if you use a real PVC "sewer" pipe in place of my free cardboard 4" tube. 🙂
They sound ok, a great experiment, and perhaps would be motiviation to build a proper set of Linkwitz's design. Not on my pay scale alas 🙁
The thread is else where, but each speaker costs perhaps $10 in parts, using this driver:
http://www.parts-express.com/grs-4f...eaker-pioneer-type-a11ec80-02f-8-ohm--292-434
They are not even worthy of the term "Polluto," perhaps if you use a real PVC "sewer" pipe in place of my free cardboard 4" tube. 🙂
They sound ok, a great experiment, and perhaps would be motiviation to build a proper set of Linkwitz's design. Not on my pay scale alas 🙁
Brilliant audio engineer makes revolutionary BIY (build it yourself) speaker designs available for a pittance IP charge that can provide amazing performance at very reasonable cost. Meanwhile DIYers post bizarre designs alleged to be "clones" of or "like" or "inspired by" said engineers work that show no resemblance whatsoever. "Oh, what a world...what a world!" (WWotW)
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And in the process they learn and think about the original design? Sure not all these wacko ideas work out, so?
The devil is in the details.
I documented my "clone" of the LX-Mini*, and I'm one of those people that another poster is talking about, the people that are inspired by Linkwitz but who are too cheap and creative to buy and build the kit.
In my case, I found that some fine time with a microphone and a miniDSP made all the difference in the world. In fact, I was ready to abandon the project, but once I EQ'd it, it became one of my favorite DIY projects... ever.
Basically, these Linkwitz speakers depend on a ton of EQ.
* http://www.diyaudio.com/forums/multi-way/264680-lx-mini-homage-2nd-try-2.html
Kevin you're not just blowing hot air
You are absolutely right, Kevin. If someone wants to build a (say) Linkwitz LXmini, yes he should get a "royalty" even if it's just from sale of plans. Certainly for any commercial effort. On the other hand, quality speakers demand quality drivers (his do, anyway) and are out of the reach of many. Unlike a store-bought speaker, it is or should be difficult to return them if you don't like them, excellent design thought may have been. My CIY (clone it yourself) method has two advantages: can use cheap parts, and pride of one's own "design" if it succeeds and if it fails, to not blame a professional designer who probably really is blameless 🙂
You are absolutely right, Kevin. If someone wants to build a (say) Linkwitz LXmini, yes he should get a "royalty" even if it's just from sale of plans. Certainly for any commercial effort. On the other hand, quality speakers demand quality drivers (his do, anyway) and are out of the reach of many. Unlike a store-bought speaker, it is or should be difficult to return them if you don't like them, excellent design thought may have been. My CIY (clone it yourself) method has two advantages: can use cheap parts, and pride of one's own "design" if it succeeds and if it fails, to not blame a professional designer who probably really is blameless 🙂
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So stop calling your inane twiddlings Pluto clone or LXmini clone and advertise them for what they are...??? Linkwitz is the guy supporting DIY (BIY) like nobody else except NP with high quality projects that can be built at reasonable cost and with miniscule return to SL. If you find it necessary for whatever reason to conjure up your own fantasy speakers, then let them stand on their own. Why must you insist that they have some connection to SL's projects? They either work...or they don't. Get out from behind SL's skirt and either stand or fall.
Harsh.
We're all standing on the shoulders of giants here, even the pros.
If I call a project an 'homage*,' it should be obvious that it was inspired by Linkwitz but it isn't his loudspeaker.
*http://www.diyaudio.com/forums/multi-way/264680-lx-mini-homage-2nd-try.html
That attitude, that we're 'behind SL's skirt', is they type of thinking that puts Linkwitz on a pedestal.
The world you live in is dominated by your assumptions. Let's make a friendlier world with some other assumptions.
- Most Diy-ers have "leftover" drivers, or "typical" drivers at hand, like: Vifa TC9F, 10 XLS peerless, cheap universal Vifa 25 mm dome, Visaton Frs 5x, peerless Sls 8, "cheap generic 5 inch and 7 inch drivers with paper or poly cone that measured well in one of Zaph's reviews" econowave's, B&C DE 250 the list is endless. Would these drivers work in X or Y design is a second nature.
- Diy people are curious, i tried an omnipolar f.a.st. with styrofoam balls in the nineties, just to satisfy my curiosity. Not to make worlds best speakers.
- Shelling out such an amount for one pair of speaker is a big commitment. For me it would put a stop on several other things i would like to try.
- Not everybody is on the DSP bandwagon yet. A passive version or hommage of the Pluto, how stupid it may seem, is an valid reason to start tinkering.
- I love to read clone threads, not all, but if it's smartly done, the basic assumptions of the original will be properly tested. Is the 900 Hz x-over in the Pluto an Aura driver (thd x-max) based desicion, theoretical or the best solution? Is something that would interest me. And in the end would let me better understand the design.
- Peer review, open discussion, free exchange of ideas and trying to make something better or simpler for less is kind of the basics of our civilization.
Casting ideas in stone kills them. The Pluto is an idea, not an end.
Regards
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Even those of us who love our MiniDSP may already have it committed to (brace yourselves) serving as the EQ for a system include old Bose 901s, speakers that definitely need EQ-ing so bad they come from the factory with one 🙂
Doing a mock-up or a knock-off also allows the experimenter, which is probably all of us, to hear for himself what merit(s) a design may have. And consider that if someone likes their feeble attempt, they may commit to building one of the "real" speakers such as one of Herr Linkwitz's.
And finally, if it were not for Clones, what would they have named one of the Star Wars movies 🙂
Doing a mock-up or a knock-off also allows the experimenter, which is probably all of us, to hear for himself what merit(s) a design may have. And consider that if someone likes their feeble attempt, they may commit to building one of the "real" speakers such as one of Herr Linkwitz's.
And finally, if it were not for Clones, what would they have named one of the Star Wars movies 🙂
All speakers depend on a lot of eq.
Mechanical eq and/or electrical eq.
The mechanical eq is what some people seem to forget.
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