Mounting an RD50 - Page 3 - 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 7th February 2013, 09:12 AM   #21
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
Quote:
Originally Posted by sfdoddsy View Post
I have to admit I wasn't overwhelmed by the RD50. I tried some side baffles like StigErik, but couldn't get the the sound as natural as I am getting from my Orion clones, or from my test baffle with the Neo10s and Neo3s.

There was a forwardness that EQ didn't eliminate even though they measured pretty flat.
Try to tilt the response down..... it should do the trick.

I have found that the RD75's are very sensitive to EQ. Just a slight adjustment will change the sound very much.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 7th February 2013, 01:13 PM   #22
zmyrna is offline zmyrna  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: London
Stig;
If you have tried it, can you please share with us the results? (have you already posted them on your thread?)
Am I remembering it correctly that you have used pipe isolation foam for rounding the edges as well?
I have seen two sizes of pipe isolation foam; larger one is about 2" diameter. What size rounding are you using?
And finally, what would be the difference between a 4" wide flat wing vs. 4" diameter circular wing? (in terms of FR and off axis behaviour)
In theory, circular wing should smooth out some of the baffle step. And if it is big enough, it should smooth out most of it.
  Reply With Quote
Old 8th February 2013, 10:55 AM   #23
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
I have some measurements, if that is what you are asking for?

Yes, I used foam tube pipe insulation to make the rounded edges. Outer diameter is 40 mm or so. I tried different sizes, and the one with approx the same size as the driver itself gave the best measured result. I also found it was very important to use tape to cover the gap between the tube and the driver.

If you mean a wing with rounded egde, I did try that with no improvement at all.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 8th February 2013, 10:57 AM   #24
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
I also tried wings as small as 4 cm width, with no luck. The simple rounded edges provided the best measured performance.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 8th February 2013, 05:40 PM   #25
zmyrna is offline zmyrna  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: London
Ok, thanks Stig.
I just saw your thread on your baffle experiments.
You have placed the pipe foams so that they are flush with the front plate.
In that case, the front and back FR and radiation won't be same.
I am more interested in placing the foam right at the center.
So that the cross section looks like a dumbbell and front vs back reponse is same.
This would have a symmetrical waveguide function too.
And this waveguide can be made small or big depending on what we want to achieve.
  Reply With Quote
Old 8th February 2013, 08:02 PM   #26
diyAudio Member
 
Join Date: Sep 2002
Location: Australia
Quote:
Originally Posted by StigErik View Post
Try to tilt the response down..... it should do the trick.

I have found that the RD75's are very sensitive to EQ. Just a slight adjustment will change the sound very much.
The problem wasn't so much the sound at one position, I can EQ that.

The problem was that the sound changed with position.
  Reply With Quote
Old 13th February 2013, 07:19 AM   #27
diyAudio Member
 
Join Date: Feb 2013
I'm new to the forum. I've done some basic technician work on Mcintosh ML-1
using Roger Russell' crossover upgrade and rebuilding the surrounds and have a fundamental idea of what to expect out of different speaker designs and what I like to hear after recently upgrading components on Magnapan mg-12 and have
had fun tweeking the crossover..
I'm considering building a speaker system using a Bohlener RD50 line array . Has anyone heard the RD50 designed in a three way design such as the ' Colossi' in parts-express projects . The problem I see with this design is Mid-bass heavy and it looks like it can get into that region Lynn Olson calls the 'Dark Area' of multi speaker systems of polar lobes , phase dropouts and harsh acoustic anomalies . Especially since it was designed on a short schedule.
  Reply With Quote
Old 13th February 2013, 10:02 AM   #28
diyAudio Member
 
Join Date: Sep 2002
Location: Australia
From reading the write-up of the Colossi, it seems it was meant to showcase a design rather than be listened to.

Given my experience, I'd be wary about using the RD50 in such a setup. Maybe a monopole is different. The RD75 would seem to be a better choice.

That said, a couple of chaps at htguide have built similar systems and seem quite happy. Here's one.

http://www.htguide.com/forum/showthread.php4?t=36874
  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
RD50 - superdac with ES9018 Lupulroz Musicaltech 30 26th February 2014 04:07 AM
2 x BG RD50 for sale Thims Swap Meet 1 22nd December 2010 01:36 PM
BG RD50 planars going real cheap Thims Swap Meet 2 19th May 2010 01:35 PM
2 x RD50 and 4 x UCD180 for sale Thims Swap Meet 4 23rd July 2009 05:27 AM
Bohlender Graebener RD40/RD50 and Magnepan? Daveis Planars & Exotics 2 17th September 2006 11:03 PM


New To Site? Need Help?

All times are GMT. The time now is 04:33 PM.


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