|Multi-Way Conventional loudspeakers with crossovers|
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|4th September 2011, 01:41 AM||#101|
Join Date: Aug 2007
Location: Sunny SC,USA 15 min south of Charlotte NC
Is it a function of slot volume versus the +/- volume of air moved by the drivers and is there a good ratio of driver volume versus slot volume as if the drivers move 6 liters of air and the slot is half the driver volume then not counting mechanical losses then the air in the slot moves at 2x the V of driver V...given velocity of air is a function of driver cone velocity and volume changes with amplitude of the signal to the driver there has to be a " sweet spot " for a driver to slot ratio.
I think I need another glass of wine
I think that was a question with out a question mark treat it as such ....
PS there are those that do not frequent these forums and I know some personally it is mainly behind the scene sniping that makes them seek other forums to vent or share. we have lost some great thinkers on these list, try to not take things personally. we all have a right to our opinions we also have a right to believe or discent(sp). discussions like these is where great ideas are born or reborn.
OK I'm going for that glass of vino
"Lead me not into temptation...I can find it myself."
|4th September 2011, 07:25 AM||#102|
I lived 50 years near and around Greenville,SC been to your neck of the woods many times,have relatives in concord,Charlotte.
Thanks for all the nice comments and I got your drift,I'm surprised some of the smarter people even reply to some that post here,I think some folks gotta fuss,maybe it gets them off, I like a more layed back approach,fine women,good wine and great music,what else you need?I like parties people come over and bring food,wine and music to put on my system ,what a pleasure to entertain all the senses!and have request to play my creation for them !
I got all I need to start one unit build and see how they do,waiting on ups to get them here maybe Tuesday,
|4th September 2011, 05:19 PM||#105|
diyAudio Member RIP
Join Date: Nov 2003
Location: Brighton UK
Regarding that discussion I posted some information about what was going on.
However the OP got shirty about what I was saying (which was verifiable in a
circuit simulator), carried on insisting it did things it doesn't, and then to boot
insisted it was some form of personal attack, which it simply wasn't.
So I left the discussion, because it wasn't one. It was a very interesting
concept, with inevitable consequences the OP did not want to entertain.
Yes, I was certain about what I was saying, and also certain it didn't
do the things it seemed the OP was simply making up, c'est la vie.
It is technical stuff, and it is a matter of mindset. I never said the T-bass
circuit didn't work, it does, and I showed how it essentially worked, along
with the inevitable (lower) impedance transformation it needed to work.
Just because it works doesn't mean the OP's conjectures are correct.
The idea that just because you come up with idea that you are also
the expert on how it works makes no sense. It doesn't work like that.
I like ideas (especially good ones), and understanding what is going on.
Take this 4" full range driver :
Stick some form of treble deflector in front of it* to level extreme treble
and improve dispersion. a good idea. I couldn't care less about someone
saying it works, but then saying it does for ridiculous reasons. It should
work anyway, and the best understanding will lead to the best deflector.
I am not of the school poor understanding can lead to the best solutions.
*An idea condemned as very poor in another thread for no sensible reason.
Last edited by sreten; 4th September 2011 at 05:40 PM.
|4th September 2011, 05:27 PM||#106|
diyAudio Moderator R.I.P.
sounds like debating what came first, the hen or the egg
many posts seem to be 90% off topic, and only 10% on topic
tends to get boring when it continues
and any relevant and good comments it may hold are burried in...
|4th September 2011, 06:33 PM||#107|
|4th September 2011, 07:52 PM||#108|
The one and only
I understand they are serving beer this year.
I have no objection to a discussion of why a slot loaded baffle is / or is not
more efficient, and I don't have much investment in whether it is or not -
the loudspeaker works great regardless.
Physical logic tells me that it is, and I get measurably higher spl in my chair,
so I tend to go with that.
As far as appeals to authority, I go back to the lessons Oskar Heil personally
taught me. Incredible as it may seem, Oskar was not always right. So I'm
willing to be convinced otherwise, but as yet, I don't think you've made a
real effort to do so.
|4th September 2011, 08:43 PM||#109|
Join Date: Jul 2007
Last edited by bocama; 4th September 2011 at 09:03 PM. Reason: making it clearer
|4th September 2011, 09:02 PM||#110|
diyAudio Member RIP
Join Date: Nov 2003
Location: Brighton UK
I'm not arguing about (A), I'm not saying it doesn't work, I''m sure its fine.
(B) is the most interesting point, and inadequately described. As I've said
before your "physics" logic implies the narrower the slot the greater the
efficiency increase, I'm saying in reality this simply does not happen.
For (C) :
I don't see Heil's AMT principles being relevant. As first base
Air Motion Transformer - Wikipedia, the free encyclopedia indicates
its all about moving more air, with its relevant pressure increase.
The air speed increase related to diaphragm velocity is inevitable.
It does not imply increased efficiency for a volume displacement.
The point of the Heil is to use magnetic fields more efficiently, it
has essentially the same efficiency as a stretched out diaphragm
with a relatively huge magnetic structure, i.e. its a cheaper way
of moving more air, and being smaller less dispersion issues.
Simply replace every pleat in the AMT with a driver, use a zigzag
baffle and work out what happens at low frequencies, nothing
special. The Heil is special because it uses the fore and aft field
far more efficiently than a planar diaphragm, and that leakage
field will always exist wasted in any planar design, best used.
Packing a say a 30" pleated length into a say 4" length field
has obvious efficiency advantages over a simple 4" planar.
Around 9dB from basic principles, and necessarily the 4" unit
will have higher air velocity and pressure over the 30" planar.
As ever I'm also fallible and sometimes wrong, but not often.
Last edited by sreten; 4th September 2011 at 09:21 PM.
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