Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Planars & Exotics ESL's, planars, and alternative technologies

Anyone looking to use Hygeia (Airborne) AMT tweeters in their designs?
Anyone looking to use Hygeia (Airborne) AMT tweeters in their designs?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th March 2018, 11:44 PM   #21
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
I might order a couple more next month. If anyone wants in to consolidate into one shipment, just let me know.
  Reply With Quote
Old 6th March 2018, 07:17 PM   #22
ilardi is offline ilardi  United States
diyAudio Member
 
Join Date: Mar 2006
Location: Westchester County, NY
I would definitely like to order a few. Mostly for a home theater system but also for a stereo system. But before I tell you which I want I have a question and I am hoping that you (OscarS or anybody else with experience with these drivers) , based on your experience with the drivers might be able to answer so that I can decide which ones to order. Specifically I am wondering if there is much "tonal" difference between the RT-5002 and the RT-4001. I am space constrained for my LCR so that it will be difficult to use the the RT-5002 in that position, but I would still like to use the RT5002 for the left and right channels since they seem to have lower distortion and other advantages. Based on your auditioning of the drivers (I have never heard them) do you think there would be much difference in tonal/sound quality if I were to use the RT-4001 for the center and the RT-5002 for the left and right channels?

Thanks in advance for your advice.
__________________
Terry
  Reply With Quote
Old 6th March 2018, 08:41 PM   #23
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Quote:
Originally Posted by ilardi View Post
I would definitely like to order a few. Mostly for a home theater system but also for a stereo system. But before I tell you which I want I have a question and I am hoping that you (OscarS or anybody else with experience with these drivers) , based on your experience with the drivers might be able to answer so that I can decide which ones to order. Specifically I am wondering if there is much "tonal" difference between the RT-5002 and the RT-4001. I am space constrained for my LCR so that it will be difficult to use the the RT-5002 in that position, but I would still like to use the RT5002 for the left and right channels since they seem to have lower distortion and other advantages. Based on your auditioning of the drivers (I have never heard them) do you think there would be much difference in tonal/sound quality if I were to use the RT-4001 for the center and the RT-5002 for the left and right channels?

Thanks in advance for your advice.
It's hard to say because, I don't know know about everyone else, but I can't really audition just a tweeter by itself, it has to be implemented with a midrange below it (or midbass, or woofer, or whatever). I think it's because my brain is too hard-wired to hear guitar, which is my fort. My brain wants to hear a full range guitar signal, and when it doesn't it goes into blue-screen error mode, lol.

What I can do for you, however, is take FR and distortion measurements of the 4001 so you can compare them to the RT-5002. I can tell you for sure that it won't go as low simply because of the smaller size, but I'm sure you already know that.

In-room FR (including reflections) of the RT-5002:
Click the image to open in full size.

Distortion measurement of the RT-5002, in-room, mic 1" from speaker. Graph only goes up to 10k by default.
Click the image to open in full size.

I should be able to take some measurements of the 4001 soon. The nasty 2nd/3rd order harmonic distortion peaks is due to the ever so tiny resonance of the folded membrane. Yup, even these cannot escape Mother Nature. I'm going to try and tame it with a notch filter to see if it helps.

Last edited by OscarS; 6th March 2018 at 08:58 PM.
  Reply With Quote
Old 6th March 2018, 09:31 PM   #24
ilardi is offline ilardi  United States
diyAudio Member
 
Join Date: Mar 2006
Location: Westchester County, NY
Thanks so much. I agree, I also can't audition a tweeter by itself. I look forward to seeing the your measurements.
__________________
Terry
  Reply With Quote
Old 7th March 2018, 04:15 PM   #25
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Allow me to clarify a few things.
  • You wouldn't actually be buying from me, so I can't accept paypal payments. The manufacturer in China only accepts bank wire transfer. That is how I placed my initial order last October ($428).
    • Luckily on that order, I wasn't hit with any US Customs Import Duties/Fees. Talk about being worried about a lot of money being sent overseas with no recourse to retrieve it should something go wrong.
  • The timing is very long. It took them nearly 3 months because they had to order some faceplates. Hopefully they have them in stock this time around, but I don't know as I'm not there at the factory.
  • So while yes, you'd have to send me the money (assuming you want in on a consolidated order together with mine) in a non-paypal form so I could then send it to them,
    • I can't be responsible for your cash should you get impatient/worried/whatever and then want to file a paypal claim against me. I won't be going that route what so ever.
    • Obviously this buying opportunity isn't for everyone.
      • If I wasn't such a nice guy, I could have kept all this to myself from the very beginning anyways, because I did all the work. I don't need anyone to participate in this purchase with me at all to "make it happen", I buy/order my own things at will because I can. I will order my own things regardless if zero people want to order along with me.
  • If you want to order them yourself and do your own wire transfer, I can give you their email. But let me warn you, it is a lot of work.
    • Their English and overall communication is horrible..
    • They sometimes check their email only once every 2 weeks.
    • Their English and overall communication is horrible.
    • They couldn't even answer me in simple words if they had received my bank wire transfer. <--If that alone scares you, then this isn't a purchasing opportunity for you.
    • But they did email me confirmation when the order was sent, and they did come through.
    • Their English and overall communication is horrible.
    • Would it have hurt me significantly if I had lost all those $428? Not really. Sure it would suck a&# if I had, but I don't see it any different from having wasted that much on a previous relationship that didn't work out. How much money do we lose wining & dining our [now] ex-gf/ex-wives/etc? A lot, I bet. Do we recover? Sure. That's how I see it and my own personal approach when evaluating these kinds of "risks".


So like I said, maybe this isn't the group buy for you if you feel "risk". I do have faith in the vendor, and I will place my order regardless, just as I did this past October.
  Reply With Quote
Old 7th March 2018, 11:02 PM   #26
joetekubi is offline joetekubi  United States
diyAudio Member
 
Join Date: Mar 2011
Location: Atlanta
That distortion looks pretty good - looking forward to the 4001 graphs.
  Reply With Quote
Old 8th March 2018, 02:45 PM   #27
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Here is the in-room frequency response (including room reflections) of the RT-4001, with ~1W input. 2.15V into 4.5 Re.
Click the image to open in full size.

I should have the distortion graph maybe this weekend. Something was off so I wasn't trusting the measurements I was getting (too high), and replicating the graphs of previously measured drivers were also off, so I have some troubleshooting to do.
  Reply With Quote
Old 13th March 2018, 03:25 AM   #28
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Finally replicated a previous measurement, so here is the rest of the pending info.

RT-4001 Harmonic Distortion

Click the image to open in full size.


RT-20051 Frequency Response, ~1W/1m, including some room reflections.
Click the image to open in full size.


RT-20051 Harmonic Distortion
Click the image to open in full size.






For those who might be interested in the RT-50021, here is a measurement I did tonight together with those depicted above. I used a modified Parts-Express H110 Horn mounted to the RT-50021 with it's faceplate removed. Huge increase in midrange output.

Blue stock, Red w/ modified Horn.
Click the image to open in full size.

Last edited by OscarS; 13th March 2018 at 03:29 AM.
  Reply With Quote
Old 13th March 2018, 04:35 AM   #29
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Also just for the heck of it, I took the raw THD data from the decibel curves and converted them to percentage here. With the exception of that mechanical/electrical resonance, a pretty low distortion driver. Oh, and no filtering within the shown window. The only filter I run when running sweeps on tweeters is usually about 350Hz, so it doesn't affect these measurements.
Click the image to open in full size.
  Reply With Quote
Old 13th March 2018, 05:55 PM   #30
OscarS is offline OscarS  United States
diyAudio Member
 
Join Date: Jan 2011
Distortion measurements for the RT-4001 and RT-20051.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote

Reply


Anyone looking to use Hygeia (Airborne) AMT tweeters in their designs?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Airborne RT-20021 AMT tweeters (3) winslow Swap Meet 1 7th May 2012 12:52 AM
FS: Hygeia RT-3301 ribbon tweeters Samppo Swap Meet 1 17th November 2011 06:21 PM
Why Do Most Designs Favor 'Cheaper' Tweeters 2MuchRiceMakesMeSick Multi-Way 199 12th November 2011 08:57 PM
Heil tweeters from Hygeia Ambient Planars & Exotics 0 1st February 2011 06:30 AM
Hygeia? alius123 Planars & Exotics 2 11th December 2008 03:11 PM


New To Site? Need Help?

All times are GMT. The time now is 11:50 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki