Compression Drivers without Horns? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 6th August 2007, 04:31 AM   #1
NV&H is offline NV&H  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Charlotte, North Carolina
Question Compression Drivers without Horns?

I don't recall their name, but there's a speaker company in existance that uses TAD drivers in a two-way configuration. The high frequency compression driver is just bolted to the top of the woofer cabinet facing the world with no horn attached.

Obviously, the horn artifacts would be missing, but does that mean it would sound better? In such a configuration, I wonder about efficiency loss, dispersion weirdness, and frequency response anomolies.

So I'm wondering, have any of you ever listened to a compression driver without the horn?
__________________
NV&H
  Reply With Quote
Old 6th August 2007, 07:13 AM   #2
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Yes, drivers with a built-in small conical initial flare make great tweeter horns from ~5 kHz-up, though I chose to mount them to a small piece of 3/4" no-void plywood or hardwood and round over the hole to reduce reflections back to the throat and extend its BW a bit.
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 6th August 2007, 08:47 AM   #3
DorinD is offline DorinD  Romania
diyAudio Member
 
DorinD's Avatar
 
Join Date: Jan 2005
Location: Bucharest
These?
http://www.deepaudio.net/
  Reply With Quote
Old 6th August 2007, 05:24 PM   #4
robertG is offline robertG  Canada
diyAudio Member
 
Join Date: May 2005
Location: Montreal
It works, but it won't go very low. The 5kHz figure is probably correct.
  Reply With Quote
Old 6th August 2007, 05:35 PM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
it's a treble driver.
Why would one want it to do mid duty?
__________________
regards Andrew T.
  Reply With Quote
Old 6th August 2007, 05:55 PM   #6
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Huh?! Typical compression drivers (including the 4001) are BP4 alignments designed for mids and treble with the gain BW defined by the horn's acoustic loading. Since this one has a very short built-in one, it's strictly a super tweeter without any horn extension to 'unlock' some more of its usable BW.
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 6th August 2007, 08:12 PM   #7
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
It's hard to argue with the driver quality, but the implementation seems a bit -- odd.

How big an under-lap would you have at that crossover point? No mention of that or even the actual dimensions of the box. Or did I miss it?
__________________
Big Altec Moving Sale!
  Reply With Quote
Old 6th August 2007, 09:36 PM   #8
diyAudio Member
 
Robh3606's Avatar
 
Join Date: Nov 2002
Location: Destiny
I am not sure what the response is for the Tad with its Be diaphram or where the mass break point is It would be interesting to see what one measured like and how much of a CD type compensation would be needed for flat response to say 1.5-2K which is probably as high as they take the woofer. The polar response must be a mess at the crossover point.

Rob
  Reply With Quote
Old 6th August 2007, 10:18 PM   #9
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Indeed! I just assumed the main driver was a really wide BW one. This doesn't seem viable unless XO'd out at the ragged edge of the 1601's break-up modes and even then I imagine it would be marginal, but surely we're missing something. I mean they can't afford to replace such an expensive diaphragm under warranty with any sort of regularity.

One thing's for sure though, their marketing hype about the 4001's response is misleading at best since the sharp exit transition causes plenty of well known problems.
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 6th August 2007, 11:26 PM   #10
ScottG is offline ScottG  United States
diyAudio Member
 
Join Date: Feb 2003
Location: US
Quote:
Originally posted by GM
Indeed! I just assumed the main driver was a really wide BW one. This doesn't seem viable unless XO'd out at the ragged edge of the 1601's break-up modes and even then I imagine it would be marginal, but surely we're missing something. I mean they can't afford to replace such an expensive diaphragm under warranty with any sort of regularity.

One thing's for sure though, their marketing hype about the 4001's response is misleading at best since the sharp exit transition causes plenty of well known problems.

I'd bet that the midbass driver is run with out a lowpass filter. Looking over the website you'll note that the loudspeaker *must* be listened to on-axis.. While it likely is important for the top octave of the compression driver, its far more important for the midbass driver and anything approaching linearity. I'd expect a natural sp-loss starting around anywhere from 1.5 to 3 kHz.. (with the safer bet being closer to 1.5 kHz).. Based on that conjecture I wouldn't be surprised to see a 4th order electrical (LR) around 2.2-2.5 kHz for the compression driver.

I also wouldn't be at all surprised if they didn't care about freq.s above 12 kHz.
__________________
perspective is everything
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
smith horns and using compression horns for a Karlson party speaker project bikehorn Multi-Way 14 30th January 2013 06:20 PM
New & Vintage compression drivers, horns, JBL, Emilar, BMS dogbert Swap Meet 8 9th February 2011 05:34 AM
Compression drivers in horns or waveguides 454Casull Multi-Way 6 1st December 2008 01:41 PM
WANTED: Horns & Compression Drivers Carl_Huff Swap Meet 5 14th May 2007 08:43 PM


New To Site? Need Help?

All times are GMT. The time now is 03:01 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2