Why is the tweeter above the midrange/ woofer?

chuck55 · 27th November 2009, 12:55 AM

Looking at Stereophile's vertical dispersion graphs, there is almost always a large suckout when listening above the tweeter's axis. I guess because of some interference from the midrange driver below it. They recommend putting the speaker on high stands and listening below the tweeter's axis. But I don't want high stands and what if I am listening standing up?

So why don't more speakers have the woofer on top like some Denon / Mission loudspeakers?

Happy Thanksgiving

wwenze · 27th November 2009, 01:01 AM

Because tweeter produces higher frequencies hences placed higher? j/k

Because if we put the bookshelves at the table the tweeters will be at the same height as the ears.

I don't believe in bookshelves on stands, simply because if I have the space I'd be going for bigger stuff.

tinitus · 27th November 2009, 01:01 AM

Its partly about the distance from your ears to each driver

You can to some degree compensate by tilting speaker

planet10 · 27th November 2009, 01:03 AM

Momentum...

dave

rcw · 27th November 2009, 10:13 PM

A speaker that does not have a L-R characteristic through the crossover has some degree of lobe steering.

If you put the baas/mid, or mid above the tweeter the lobe steers upward instead of downward, lessening its effect, because it lessens floor reflection of the lobe.
rcw.

Borat · 28th November 2009, 12:26 AM

psychologically i like to have bass closer to the ground.

birds sing on the trees while diesel submarines run below sea level.

it just makes no sense to have treble coming from the ground and bass from the top.

bass is produced by heavy things while treble by light. heavier things tend to be placed lower.

why don't you screw the subwoofer to the ceiling ?

nigelwright7557 · 28th November 2009, 12:55 AM

QSC say you can increase bass output by putting a bass speaker on the floor or in a corner.

Key · 01:30 AM

Can't you just flip them upside down? Or would you need some sort of compensation if you did this?

Answered my first question at least on my system it sounds pretty bad.

tinitus · 28th November 2009, 01:50 AM

If xover is done properly you wont notice which driver is up or below
Its a matter of cohenrency
But there is always a certain optimal listening height fore each design
This must be determined before any xover work, which isnt always so

Key · 28th November 2009, 01:54 AM

Well for me when I just did it the problem wasn't localization of the drivers it was a suckout in the off axis FR. What do you mean specifically about "properly done" xover.

27th November 2009, 12:55 AM	#1
chuck55 diyAudio Member Join Date: Dec 2003 Location: New England	Why is the tweeter above the midrange/ woofer? Looking at Stereophile's vertical dispersion graphs, there is almost always a large suckout when listening above the tweeter's axis. I guess because of some interference from the midrange driver below it. They recommend putting the speaker on high stands and listening below the tweeter's axis. But I don't want high stands and what if I am listening standing up? So why don't more speakers have the woofer on top like some Denon / Mission loudspeakers? Happy Thanksgiving

27th November 2009, 01:03 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Momentum... dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

28th November 2009, 12:55 AM	#7
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	QSC say you can increase bass output by putting a bass speaker on the floor or in a corner. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

28th November 2009, 01:01 AM	#8
Key diyAudio Member Join Date: Jan 2009	Can't you just flip them upside down? Or would you need some sort of compensation if you did this? Answered my first question at least on my system it sounds pretty bad. Last edited by Key; 28th November 2009 at 01:30 AM.

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27th November 2009, 01:01 AM	#2
wwenze diyAudio Member Join Date: Mar 2008	Because tweeter produces higher frequencies hences placed higher? j/k Because if we put the bookshelves at the table the tweeters will be at the same height as the ears. I don't believe in bookshelves on stands, simply because if I have the space I'd be going for bigger stuff.

27th November 2009, 01:01 AM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	Its partly about the distance from your ears to each driver You can to some degree compensate by tilting speaker

27th November 2009, 10:13 PM	#5
rcw diyAudio Member Join Date: Jul 2005 Location: sydney nsw	A speaker that does not have a L-R characteristic through the crossover has some degree of lobe steering. If you put the baas/mid, or mid above the tweeter the lobe steers upward instead of downward, lessening its effect, because it lessens floor reflection of the lobe. rcw.

28th November 2009, 12:26 AM	#6
Borat Banned Join Date: Aug 2009 Location: Silicon Valley & NYC	psychologically i like to have bass closer to the ground. birds sing on the trees while diesel submarines run below sea level. it just makes no sense to have treble coming from the ground and bass from the top. bass is produced by heavy things while treble by light. heavier things tend to be placed lower. why don't you screw the subwoofer to the ceiling ?

28th November 2009, 01:50 AM	#9
tinitus diyAudio Moderator Join Date: Nov 2005	If xover is done properly you wont notice which driver is up or below Its a matter of cohenrency But there is always a certain optimal listening height fore each design This must be determined before any xover work, which isnt always so

28th November 2009, 01:54 AM	#10
Key diyAudio Member Join Date: Jan 2009	Well for me when I just did it the problem wasn't localization of the drivers it was a suckout in the off axis FR. What do you mean specifically about "properly done" xover.

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