Flat FR, harsh sound??? - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 8th September 2006, 12:12 PM   #1
Klimon is offline Klimon  Belgium
diyAudio Member
Join Date: Apr 2005
Location: Leuven
Default Flat FR, harsh sound???


I just measured the FR or a pair of vintage 12" fullrange drivers and removed the whizzer cones; result is a practically flat response up till about 3,5khz where it starts to roll-off (zobel pre-installed)

Strangely enough they sound very forward!

For the moment placement isn't very good, they're made for corner duty (the cabinets are aristocrats, sort of corner horns) which will augment bass and change subjective FR balance although I'm sure that won't be enough...

Does anyone have a clue what could be causing this harsh, thin, metallic, shouty sound and doesn't show up on the frequency response? Maybe something that'll show on a waterfall diagram?

Next step is to give them a few coats of dammar, then move on from there. My initial plan was to use the natural roll-off and coaxially install a pair of small tweeters at 4khz. If I can't get rid of the forwardness it'll have to add a coil to the woofer and lower the crossover....

I welcome any suggestions or explanations for this weird phenomenon

  Reply With Quote
Old 8th September 2006, 01:52 PM   #2
Nortp is offline Nortp  United States
diyAudio Member
Join Date: Apr 2006
Location: Phila. Pa.
It sounds to me like you are describing the effects of baffle loss. As the sound goes from a 2Pi to a 4 Pi space the lower frequencies experience a 6 dB loss, the frequency when this occurs depends on baffle geometry. The thin tinny sound might be because the lower frequencies are weak relative to the others due to baffle loss. You might consider trying a baffle step correction circuit. It's really just an inductor and resistor in parrallel that shelve down the higher frequencies to make them match the weaker lower frequencies.
  Reply With Quote
Old 8th September 2006, 02:10 PM   #3
Klimon is offline Klimon  Belgium
diyAudio Member
Join Date: Apr 2005
Location: Leuven
It sounds to me like you are describing the effects of baffle loss

That's it!!! thanks!

I hope I'll get away with less than 6db drop; read somewhere that a part of the bass output 'lost' in 4pi does return in reflection, certainly if I put these babies in their intended place: the corner! Bummer to go from 97 to 91 db with my 1.5W amps , still an easy solution

  Reply With Quote


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
nad 3020i harsh sound mad_z Solid State 14 24th August 2007 04:45 PM
how coral flat & beta driver sound? ycliew Full Range 5 24th May 2006 11:28 PM
Harsh sounding amp zeus_threat Solid State 45 9th April 2006 04:30 PM
Remove LM3886 harsh sound soundNERD Chip Amps 32 3rd March 2006 03:41 AM
fe167 harsh tenderland Full Range 33 15th February 2005 02:02 AM

New To Site? Need Help?

All times are GMT. The time now is 10:08 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2