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Somebody stop me! (Read 9441 times)
brad
Ex Member



Somebody stop me!
09/08/05 at 07:54:04
 
The idea of trying this Aurum Cantus ribbon tweeter as a super-tweeter came from Dick Olsher and his BassZilla kit though that was using an open baffler and lowther driver...


OK. It's not like I'm trying to say the HDT's need help at both extremes. I just can't help experimenting with things (as long as it doesn't cost TOO much).  Hey, you never know what you might learn.  I'm totally sold on the effects of adding the little bass augmentors. I'm not sure about the effects of adding the Aurum Cantus G2si tweeter. There's certainly more detail, but it's brighter. Not in a harsh/grainy way,  it's brighter but still smooth. Not sure if I like it yet... and I'm not sure the imaging is any better and might even be worse.  Will monkey with it some more, and let them break in, and see what it sounds like... Wink Wink Wink ??? ??? ??? Kiss Kiss Kiss


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« Last Edit: 09/08/05 at 08:26:19 by Brad »  
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Chris K
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Re: Somebody stop me!
Reply #1 - 09/08/05 at 12:16:14
 
STOP STOP BRAD STOPPPP!
What am I stopping? ???
Maybe talk you out of moving that tweeter down on the baffle by boring a big fat hole in that fine Ziggy veneer?
What is the tweeter crossed at?
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« Last Edit: 09/08/05 at 12:18:49 by Chris K »  
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Chris K
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Re: Somebody stop me!
Reply #2 - 09/08/05 at 14:32:46
 
OK 1.0mf so thats about 19K if the tweeter is 8 ohms?
But the tweeter you have is 6 ohms so that would mean 1.0mf is crossed and 26K! WOW!
So you think that is bright what is the sensitivity at that freq. on the response plot? is there a peak somewhere. If you really wanto "go nuts" and experiment get some aircore inductors of the proper value and "roll off" the Fostex unit at around 10-12K and then you'll be doing some major changes w/o cutting your speakers. I'd like to say your seriously entering HDT MkII territory Brad! I asked Steve where the wool cone driver crosses on that design but no answer so I may be way off here. I know the HiVi ribbon they like at Decware is almost ruler flat with a smooth drop from 15-20K of about 3 or 4db, and they (Decware) cross it high in the RL-3 and lower (like 3K?) in the RL-1.5 but I am not certain of where the RL-3 is crossed. Just checked the HDT MKII wool driver reponse plot and it is fairly flat out to around 3K and peaks at 95db at 5K so I imagine Steve has the ribbon doing the bulk of the work above 3K. So what your doing is just rounding up the highest 10th of the last octave. Hardly seems worth it. How high can you hear? I'm 44 and I cant hear test tones much above 14,500Hz, So you hear a marked difference with this ribbon crossed at 6db/octave at 19K huh? Maybe I should park a tweetie up top of the Horns I just got. Sure don't sound like they need anything to me but they are not broken in yet. Hmmm ??? this experimentation of yours could be interesting and informative.
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« Last Edit: 09/08/05 at 14:40:29 by Chris K »  
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brad
Ex Member



Re: Somebody stop me!
Reply #3 - 09/08/05 at 18:26:39
 
First off, this experiment is nothing like the MK-II. Efficiency of the FE206E is much higher than that wool driver as you know. The cabinet tuning is completely different - the MK-II uses the original MK-I tuning and passive radiators while mine has the "alternate tuning" of the MK-I with the new passive radiators. Also, the Aurum Cantus G2Si tweeter is about 4db more efficient than the HiVi tweeter better matching the FE206E output *and* the G2Si stays flatter out to 40k, real super-tweeter territory, though the merits of this is debatable.

Now, this is all fuzzy (perfect world) logic but... even though the crossover is high - somewhere around 25K, it is a 1st order. So at 25K we are 3db down (~93db/1w) from the 96db/1w spec, and 9db down at 12.5K (~87db) and somewhere around 6db down (~90db /1w) at around 19K.  Since this is additive to the FE206E's treble output wich is efficient even out to the 15-18K range, it's not difficult to see how this crossover setting is creating the brightness I was hearing.

I would not want to an inductor or any other components in the signal path to the FE206E because of the risk of messing up what it does and does well.  Maybe it would sound better? I'll leave that up to someone else to experiment with.  I'm looking for modifications that are purely additive without altering what is already there - which is very good.

Btw, I had some 0.47uf caps sitting around (two Auricaps and two AudioCap Theta's) and tried them out, replacing the 1.0uf Crescendo's with a pair of them in parallel - one of each brand.  You wouldn't think that a change from 1.0uf to 0.94uf would make much of a difference. But the result sounded smoother and less bright.  I much preferred it this way.

I listened to Diana Krall on CD and Andrea Bocelli on SACD. In particular the orchestral passages on the Bocelli disk sounded very very nice.  HDT indeed. This is a SHDT... Super High Definition Tower Cheesy

More listening and/or experimenting to come.
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« Last Edit: 09/08/05 at 18:37:31 by Brad »  
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Randy
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Re: Somebody stop me!
Reply #4 - 09/08/05 at 18:58:33
 
Despite that fact that most of us cannot really hear anything close to 20K ..... an extremely extended high frequency driver adds a certain amount of air and openness to the sound that is hard to live without once it has been experienced ..... ???

That is one of the reasons I enjoy the Parker Audio Behemoths so much ..... the Heil AMT is one of those drivers ..... Grin

Anyone attending this year's DecFest will be able to hear some top shelf ribbon drivers in the Parker Audio Signature speakers .....


Randy
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thedude
Ex Member



Re: Somebody stop me!
Reply #5 - 09/09/05 at 21:24:59
 
hmm, this made me think about something.  When you turn on a tv it makes a high frequency wining sound; what frequency is this sound?  -Matt
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Hrappur
Ex Member



Re: Somebody stop me!
Reply #6 - 09/09/05 at 23:16:13
 
Dude that sound just means that you're TV is on its last legs Cheesy
Best thing really, means more time to listen to music, plus means that you can still hear ok Grin My grandparents had this same problem with their TV but they never heard that anything was wrong until it blew-up Embarrassed even they heard that!
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« Last Edit: 09/09/05 at 23:16:58 by Rap »  
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crazy bill the eel killer
Ex Member



Re: Somebody stop me!
Reply #7 - 09/10/05 at 00:48:35
 
Hi Brad,
Going by memory, I don't believe the Aurum is a dipole ribbon (I'm too lazy to look up the spec sheet). If it's not, why don't you try mounting it on the rear of the cabinet firing towards the back wall. This should cut down on the brightness some w/o losing the air and sparkle this driver is capable of producing. Let us know.

Bill
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brad
Ex Member



Re: Somebody stop me!
Reply #8 - 09/10/05 at 09:17:43
 
I don't hear as much brightness with the new crossover caps.  It sounds pretty good. There is some definite majic lost when I disconnect them - so I know they're doing something good.  I'm gonna let them break in some before messing with them more.
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Corey
Ex Member



Re: Somebody stop me!
Reply #9 - 09/10/05 at 19:11:29
 
Brad,

You really motivated me to try some tweaks myself.



The coconut tweak. This really fattened up the sound.   Wink

Corey
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Corey
Ex Member



Re: Somebody stop me!
Reply #10 - 09/10/05 at 19:28:55
 


The Paul Gilbert Intense Rock video tweak. This greatly increased speed and articulation.  ;)

Corey
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Corey
Ex Member



Re: Somebody stop me!
Reply #11 - 09/10/05 at 19:49:28
 



Okay guys, I saved my best tweak for last. The Archery Research AR 31 tweak. This tweak is just plain deadly. I have kept this one to myself for quite some time but felt guilty. You saw it here first!  ;)

Corey
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brad
Ex Member



Re: Somebody stop me!
Reply #12 - 09/10/05 at 23:52:25
 
Corey, is that sarcasm or just an interesting sense of humor you got there?  Not getting enough attention lately?  ;)  I can't tell if you're just trying to be funny or if you're implying that my experiments (with real audio components) are rediculous.
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Hrappur
Ex Member



Re: Somebody stop me!
Reply #13 - 09/11/05 at 01:21:44
 
Brad the man just loves his HDTs cant blame him Wink
Im moved between fascinated and horror,following youre tweeks (kind-off like C.S.I) Its like watching the autopsy of a loved one(Im a newlywed HDT owner) but at the same time looking for the key to the safe-deposit box in the corps. Im just glad its your HDTs and not mine.......Youre A braver man than I Grin
Keep us posted

and take care, H.
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« Last Edit: 09/11/05 at 01:25:36 by Rap »  
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Corey
Ex Member



Re: Somebody stop me!
Reply #14 - 09/11/05 at 01:26:01
 
Brad,

Pure humor. I just learned how to post pics today and wanted to have some fun.  :)

Take care Brad,

Corey
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