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Moving from placing the Neo on the back of the baffle to the front does not change the forward alignment very much, shouldn't we see more difference ? There was no optimization with regard to the forward response in this case, everything remained the same as it was when the Neo3 was placed at the back of the baffle.
Thanks,I will go a little bit further in explanation. Evidently the 6ND430 is a good speaker. At least the best dynamic midrange I have played with so far. I am a bit jealous about the Neo10s which couldn't be delivered to me by 'black import' at Easter time this year. I have had a long going mail discussions with Sales Managers at B&G Radia about this unit going back to the time ProRaum in Germany put out a design with them. Meniscus was telling they would sell them eventually but couldn't meet my time window this time. May be later. I have no doubt they are great. 6ND430 is a very good alternative though. The most real improvement in this design is the division of Bass- and Mid- Tweeterpanels. Definition is absolutly improved by avoiding bass influences to spread via the baffle to the other units and may be also overall clarity. It is easily heard and does imply restrains for building with all units on the same baffle.Regarding the No Baffle experiments I was surprised by the great variation in response that I found. I have no good explanation to the thruth that I got very much more consistent and likeable ('realistic') results just from putting a small baffle like my 20 cm (8"). Without baffle I had a massive EQ with 15 dB shelving going to put out level sound with 300 Hz as crossover frequency. With the narrow baffle I can go down to 250 Hz without EQ, why ? To me the Constant Directivity argument is valid. We probably play in more symmetrical environment most of the time to make the intuitive strenght of the argument valid. Also some toe in of the speakers seem to improve the stereo sweetspot.Regading Rudolf's question about angeling the bass panels I have no answer yet. Too little time to try. But I don't suspect any radical improvments in my room. Bassresponse doesn't seem that sensible. The room is fairly lively I think but seems to do OB sound justice.P.S. I had favorable comments about the Neo3 performance in Uppsala./Erling
I have further reduced wood consumption for the Blindstone.Eminenca Alpha15s are replaced by AE IB15, just a pair of them. I put them up because of a thread in our Swedish HiFi Forum regarding IB15 and Dipole15 in OB.I thought I could say something about the IB15 potential there so a quick fix.Well the IB15 will stay. I have previously aired that I thought the Alphas the weakest link in The Blindstone. So it was.In fact the whole speaker reached a new level in definition and clarity. Drumtransients are a pure fun as is also the rest of the music. Today, saturday, I have supplied CD after CD for playup. I am still amazed. It is quite in the league among anything I ever heard from dynamic speakers, except some electrostatic designs like Quad or ML.In fact the IB15s were waiting for some electrostatic panels to arrive, but when that will happen is written in the stars./Erling
Very intersting Erling I have a pair of Alpha 15 still new in their box. I may not even open them, instead I might try the AE dipole15. I have always been wondering about clearity with the Alpha.Ed
May be you don't have this kind of asphaltrubber sheets over there, it is not any kind of felt.You usually by it in car accessories shops, they use it to prevent panelresonances of any kind.It is quite hevy and in test proven as good as any special resonancedamping material.Of course, Ric, I will not prevent you from building as good an Eminence Alpha 15 speaker as possible.Myself I will stay with the IB15. /Erling
28mm is not exactly equal to 0.75"...Regardless, I'd have to say I'm pretty dubious about the relative merits of baffle thickness and damping versus a higher quality motor and cone. You can't remove distortion once it's introduced. I'd be very interested to find measurements that demonstrate the (audible) effect of various baffle thickness/damping strategies. Not to say that measurements are everything but I'm learning that it is at least helpful to get those right first.
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