Bohlender & Graebener transducers - 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 30th July 2002, 12:20 PM   #1
diyAudio Member
 
Join Date: May 2002
Location: UK
Default Bohlender & Graebener transducers

Has anyone here had any exprience with these?
I thought the Neo 8 might be a good base for a little monitor.
Thoughts?


http://www.bgcorp.com/1pages/OEMdrivers.html



Setmenu
  Reply With Quote
Old 30th July 2002, 07:01 PM   #2
diyAudio Member
 
Join Date: Jan 2002
Location: Livermore, CA
Default Experience with RD75 and Neo8

I have some experience with BG drivers.

The Neo8 has some interesting characteristics, but also some that make it difficult to work with, particularly in a smaller design such as you propose.

Here are some plots on axis and off, mounted on a 2' X 4' baffle:



Click the image to open in full size.

In a longer line array, the on axis peak at 13 kHxz is ameliorated to a degree.

Used in singles, the Neo8 has very little vertical disperion at high frequencies (imagine trying to make a 6" dia tweeter - it would beam like a searchlight above 5 kHz), so the speaker would have to be a just the right listening height. In multiples in a line array, it is more useful and less critical of listening position, IMO.

The bigger B&G drivers make some truly wonderful midranges, say running an RD75 from 600 Hz to 5-7 kHz, for example. Stunning on classical music, to say the least.

Regards,

Jon
  Reply With Quote
Old 31st July 2002, 04:35 AM   #3
JoeBob is offline JoeBob  Canada
diyAudio Member
 
JoeBob's Avatar
 
Join Date: Nov 2001
Location: Montreal, Canada
Well, I was planning on using a NEO8 up to 5.5kHz and then crossing over to a NEO3PDRFP above that. Maybe something like that is what you're looking for. Unfortunately I've got some of the drivers (probably going to use a focal woofer for the base), but it won't get started until I finish off my current speaker set, so I don't have any actual experience...
  Reply With Quote
Old 31st July 2002, 04:25 PM   #4
CHRIS8 is offline CHRIS8  United States
Account Disabled
 
Join Date: Dec 2001
Location: VA, USA
I do not understand your objective. You state this is a minimonitor, and from this i must presume you are using a 5.25" or 4" midbass. You want to cross around 1.2-1.5khz fom mid to neo8, and then 5.5khz to neo 3? This is what i must presume with lack of further description.

What is point of this? Their are pleny of adeuqate 5.25" Mids available that exhibit excllent properties into 2-2.5khz range.

Explain.

-Chris
  Reply With Quote
Old 1st August 2002, 12:51 AM   #5
JoeBob is offline JoeBob  Canada
diyAudio Member
 
JoeBob's Avatar
 
Join Date: Nov 2001
Location: Montreal, Canada
I personally wanted to see what these ribbons could do, so using the neos would get good top end and go down to say 1k. I know many good woofers are capable of producing excellent sound there. The point of my exercise was to see what the BG planars sounded like. Who knows, maybe I'll like them better then a cone driver, maybe I'll hate them, but there's one way to find out...
  Reply With Quote
Old 1st August 2002, 04:10 AM   #6
JoeBob is offline JoeBob  Canada
diyAudio Member
 
JoeBob's Avatar
 
Join Date: Nov 2001
Location: Montreal, Canada
My initial experiments with the neo8 show that it's off axis performance (virtical) really isn't as bad as I was lead to believe (or maybe my standards aren't as high as some). But I feel confident that I can do without a "super tweeter" for my needs and where it'll be used (smallish room). Probably soon I'll couple them with small woofers (6" to 8") to see how that sounds.
  Reply With Quote
Old 7th August 2002, 10:01 PM   #7
diyAudio Member
 
Join Date: Apr 2002
Location: Cincinnati, Ohio
I'm curious about these drivers as well. What kind of woofer are you mating them up with and what crossovers?

What are some general rules of thumb on xover frequencies?
  Reply With Quote
Old 7th August 2002, 11:07 PM   #8
JoeBob is offline JoeBob  Canada
diyAudio Member
 
JoeBob's Avatar
 
Join Date: Nov 2001
Location: Montreal, Canada
I've heard of someone in the partsexpress forum who crossed them over at 700Hz & 8kHz, but I'd cross them over around 6-7kHz. They got alot of praise as midranges. I'm still playing around with mine to find good xover frequencies, but 700Hz sounds nice. I'm not dead set on a high frequency, but probably 7k is where I'm going to try first, I just haven't decided on what tweeter to put above it, the NEO3 can go down to something like 2k, so it'd be a waste to use it...
  Reply With Quote
Old 8th August 2002, 01:24 AM   #9
diyAudio Member
 
Join Date: Apr 2002
Location: Cincinnati, Ohio
NEO3 is $40. The Vifa =XT25 is $60. I'd be willing to try the NEO3 if it is a good tweeter ....

So something like this:

NEO3 6khz- >20khz ($40)
NEO8 700-6khz ($60)
Peerless 6.5 ~60-700hz ($40)

($140 for drivers per speaker) hmmm i guess your right ... it is getting pretty expensive.

I'm just thinking outloud here ...
  Reply With Quote
Old 8th August 2002, 01:30 AM   #10
JoeBob is offline JoeBob  Canada
diyAudio Member
 
JoeBob's Avatar
 
Join Date: Nov 2001
Location: Montreal, Canada
Thinking out loud as well. I'm sure the neo3 would make a good match, but I'd rather find something that didn't go as low, for it feels like a waste, if you understand. I was thinking of pairing them with an 8"-10" since they only have to go to 700Hz. If anyone know of a good tweeter to cover from 6k or 7k upwards, please do tell. I'd like to use a planar or ribbon or what not to keep with the theme, but some of those get mighty expensive...
  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
Bohlender&Graebener Neo 8 Magnetostat capslock Multi-Way 78 7th June 2013 12:24 PM
Bohlender Graebener Ribbons AuroraB Multi-Way 32 12th July 2012 04:30 AM
Bohlender Graebener Neo3 where to buy el_mariachi Multi-Way 18 16th July 2006 05:53 AM
Toam Bohlender and David Graebener gvinson Multi-Way 5 25th January 2002 07:57 PM


New To Site? Need Help?

All times are GMT. The time now is 05:28 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