Go Back   Home > Forums > >

Multi-Way Conventional loudspeakers with crossovers

HiVi Planar Isodynamic Tweeters
HiVi Planar Isodynamic Tweeters
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
Old 2nd July 2011, 05:05 AM   #1
otto88 is offline otto88  Australia
diyAudio Member
 
otto88's Avatar
 
Join Date: Dec 2007
HiVi Planar Isodynamic Tweeters
Default HiVi Planar Isodynamic Tweeters

Hi

Do or could be any of HiVi's Planar Isodynamic tweeters have open backs, i.e. dipole radiating? I know B&G’s Neo3 is, but 90.5 dB is a tad low in sensitivity for my application. I’m after at least 93 db from about 2000 Hz up.

The RT1II won’t cross below 3.5 Hz without losing sensitivity . .

The RT2E-A Overview RT2E-A Isodynamic Tweeter_HiVi, Inc. or RT8-II http://www.swanspeaker.com/product/htm/view.asp?id=18 could have their backs simply screwed off, but I can’t be certain if the backs contains the magnets . .

And would it lose sensitivity if the back were removed??

Last edited by otto88; 2nd July 2011 at 05:10 AM.
  Reply With Quote
Old 6th July 2011, 12:28 AM   #2
wolf_teeth is offline wolf_teeth  United States
diyAudio Member
 
wolf_teeth's Avatar
 
Join Date: Mar 2006
Location: Indiana
The central magnet is attached to the rear-plate on the larger units.

Also- the screws once removed will likely force the voice coil to become unattached with a jig to hold them fast. It happened to me:

Click the image to open in full size.

I would not advise it. Most will lose sensitivity if made to run dipolar anyway.

Later,
Wolf
  Reply With Quote
Old 6th July 2011, 02:24 AM   #3
otto88 is offline otto88  Australia
diyAudio Member
 
otto88's Avatar
 
Join Date: Dec 2007
HiVi Planar Isodynamic Tweeters
Default dipole HiVi

Thanks, Wolf

So I just bought *two pairs of HiVi RT8II.
They're slim, I'll run them back to back to give a dipole pattern like the mids (Neo10s) and rest of the system, and have about 94 db sensitivity.

I hope they sound as good as the Neo3 . .
  Reply With Quote
Old 6th July 2011, 02:57 AM   #4
wolf_teeth is offline wolf_teeth  United States
diyAudio Member
 
wolf_teeth's Avatar
 
Join Date: Mar 2006
Location: Indiana
The RT8 won't reach 20kHz, FYI. It's more suited as an upper-midrange.
You're welcome!
Later,
Wolf
  Reply With Quote
Old 6th July 2011, 03:41 AM   #5
otto88 is offline otto88  Australia
diyAudio Member
 
otto88's Avatar
 
Join Date: Dec 2007
HiVi Planar Isodynamic Tweeters
According to HiVi's published FR, the RT8II is fairly flat up to about 10 kHz

have you tested it and found that it tapers off at . . . HZ?

Cheers
  Reply With Quote
Old 6th July 2011, 04:10 AM   #6
wolf_teeth is offline wolf_teeth  United States
diyAudio Member
 
wolf_teeth's Avatar
 
Join Date: Mar 2006
Location: Indiana
It wasn't me. It was somebody else on PE-TT forum, and I tried searching but can't find it. 10kHz is not 20 kHz, so that lacks quite a bit. And as I recall, it started to rolloff about 8kHz. It's very directional being so large, and the power response suffers off-axis. I tried PM'ing the person I think it was, and hopefully he'll right back and let me know where it was posted.

I hope to update later,
Wolf
  Reply With Quote
Old 6th July 2011, 04:14 AM   #7
otto88 is offline otto88  Australia
diyAudio Member
 
otto88's Avatar
 
Join Date: Dec 2007
HiVi Planar Isodynamic Tweeters
PS: Your Photobucketed 61 Custom T-Bird is coool.
Is it road registered? can you see out?
  Reply With Quote
Old 6th July 2011, 04:20 AM   #8
wolf_teeth is offline wolf_teeth  United States
diyAudio Member
 
wolf_teeth's Avatar
 
Join Date: Mar 2006
Location: Indiana
Quote:
Originally Posted by otto88 View Post
PS: Your Photobucketed 61 Custom T-Bird is coool.
Is it road registered? can you see out?
It's actually not mine, but it is my driveway. The thing ran out of gas on the way to the Kruse Auction Park.

If you want t look it up on-line, it's called the 'Thunderflight', and the guy is a local around here. He was driving it, so it must be legal.

Later,
Wolf
  Reply With Quote
Old 6th July 2011, 04:20 AM   #9
otto88 is offline otto88  Australia
diyAudio Member
 
otto88's Avatar
 
Join Date: Dec 2007
HiVi Planar Isodynamic Tweeters
Thanks Wolf

I cant hear much above 11 KHz, but as I already have the Neo3 (displaced as "tweeter choice" by the RT8II), I could use the Neo3 as more of a super tweeter

But I'd forgotten about the limited directionality of the RT8II, which is very large for basically a tweeter, 2 - 12 kHz . .

I'll do a frame that allows me to use either or both tweeters, and the Neo10 mid. See what works best
  Reply With Quote
Old 6th July 2011, 04:24 AM   #10
wolf_teeth is offline wolf_teeth  United States
diyAudio Member
 
wolf_teeth's Avatar
 
Join Date: Mar 2006
Location: Indiana
You're welcome-
Please report back your results!
I'd love to see the pics,
Wolf
  Reply With Quote

Reply


HiVi Planar Isodynamic TweetersHide this!Advertise here!
Thread Tools

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
Ribbon, Planar Tweeters for Sale IceBadger Swap Meet 1 30th December 2010 05:31 AM
Hivi B2S as tweeters? gainphile Multi-Way 10 28th February 2009 05:32 PM
FS: Vifa D25ASG and HiVi TN28 tweeters creek Swap Meet 0 9th January 2008 03:09 AM
4 Bg Neo3 Planar Tweeters omarmipi Swap Meet 3 28th September 2006 02:01 AM
FS: Hi-Vi Research RT2 Isodynamic planar tweeters bbaker6212 Swap Meet 9 25th September 2002 04:20 PM


New To Site? Need Help?

All times are GMT. The time now is 08:22 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki