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Multi-Way Conventional loudspeakers with crossovers

Discussion arising from Geddes loudspeaker
Discussion arising from Geddes loudspeaker
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Old 30th April 2008, 02:24 PM   #381
auplater is offline auplater  United States
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Default Re: Re: Rockport

Quote:
Originally posted by ShinOBIWAN


They are most definitely poor man's Rockport's, I borrowed heavily from their styling cue's.

Be sure you take up Buddhism, you'll need the meditation once you start spraying wood/MDF.

Ahhh...OOhm... I'm going to my special place...

Actually, I've sort of been inspired by the finish on the VMPS RM-V60's... and the wife's interested...but who knows???

BTW: Your renderings are super... you must have:

>Well, Im a jet fuel genius - I can solve the worlds problems
>Without even trying
>I have dozens of friends and the fun never ends
>That is, as long as Im buying
>Is it any wonder Im not the president
>(hes not the president)
>Is it any wonder Im null and void?
>Is it any wonder Ive got

>Too much time on my hands, its ticking away at my sanity
>Ive got too much time on my hands, its hard to believe such a calamity
>Ive got too much time on my hands and its ticking away from me
>Too much time on my hands, too much time on my hands
>Too much time on my hands

C/O Styx

sorry for the OT... just havin' some fun...

L8tr

John L.
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Old 30th April 2008, 03:36 PM   #382
ShinOBIWAN is offline ShinOBIWAN  United Kingdom
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Default Re: Re: Re: Rockport



Too much time on my hands? Absolutely
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Old 30th April 2008, 04:42 PM   #383
planet10 is offline planet10  Canada
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Discussion arising from Geddes loudspeaker
Default Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: No More Re's!!

Quote:
Originally posted by dlr
Gedlee is certainly correct.... Energy has nothing to do with it
He is when he says force stays the same (ignoring the dipole), but it takes energy to do the work of exciting a resonance... so the only columns that are relevant to the discussion are the energy columns, and they decrease with frequency.

dave
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Old 30th April 2008, 04:53 PM   #384
planet10 is offline planet10  Canada
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Discussion arising from Geddes loudspeaker
Default Re: Re: Re: Re: Re: No More Re's!!

Quote:
Originally posted by MJL21193
It clearly illustrates what I'm saying.

Here is the table above turned into an energy/frequency chart

dave
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File Type: gif linkwitz-energy-freq-chart.gif (14.2 KB, 227 views)
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Old 30th April 2008, 05:05 PM   #385
dlr is offline dlr  United States
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Default Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: No More Re's!!

Quote:
Originally posted by planet10


He is when he says force stays the same (ignoring the dipole), but it takes energy to do the work of exciting a resonance... so the only columns that are relevant to the discussion are the energy columns, and they decrease with frequency.

dave
No, that has nothing to do with the context of the discussion at that point, the energy column is meaningless with regard to the original context. The original context was that of the force applied as a function of frequency, there was nothing about resonance. An unequalized driver, regardless of its use in a monopole or a dipole, will be under constant force when unequalized. The energy column is useless in that regard.

If you want to diverge to some other aspect, fine, just address the topic in context.

Dave
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Old 30th April 2008, 05:46 PM   #386
planet10 is offline planet10  Canada
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Discussion arising from Geddes loudspeaker
Quote:
Originally posted by dlr
The original context was that of the force applied as a function of frequenc
The original context is that the higher in frequency the resonance the less likely it is to get excited... that takes energy not force.

dave
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Old 30th April 2008, 05:57 PM   #387
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by dlr


No, that has nothing to do with the context of the discussion at that point, the energy column is meaningless with regard to the original context. The original context was that of the force applied as a function of frequency, there was nothing about resonance. An unequalized driver, regardless of its use in a monopole or a dipole, will be under constant force when unequalized. The energy column is useless in that regard.

If you want to diverge to some other aspect, fine, just address the topic in context.

Dave
Quote:
Originally posted by planet10


The original context is that the higher in frequency the resonance the less likely it is to get excited... that takes energy not force.

dave
For each cycle of application of force, the higher the frequency, the shorter duration force is applied, thus for each cycle, less energy is transferred. This seems resonable to me.

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Old 30th April 2008, 06:42 PM   #388
dlr is offline dlr  United States
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Quote:
Originally posted by planet10


The original context is that the higher in frequency the resonance the less likely it is to get excited...
dave
Not the context of John's post to which Gedlee replied, the statement of interest by John being this one:

"The further the cone travels, the more opposing force, therefore more kinetic energy to deal with.".

The opposing force will be constant with frequency if the original applied force is constant with frequency. Beyond that it's trivial.

Quote:

that takes energy not force.
There will be no transfer of energy without force, that is trivial as well and ought to be obvious. It takes force to move an object, it's the force that matters. Energy is accumulated over time with the continued application of force. A resonance is the result of energy transferred over time, but not transferred out as an acoustic wave or dissipated, in this case as heat.

What really counts is what resonances may exist in the object to begin with and how much damping exists at those frequencies. It takes far less movement (linear displacement) of a panel at higher frequencies to achieve the same SPL output, so higher resonance frequencies could easily result in higher SPL from a resonating panel than at lower frequencies, especially when one considers that panels are strict implementations of bending wave transducers, having very strong end terminations (corners). Raising the resonant frequencies can be counter-productive. The fact that total transferred energy drops with increasing frequency is not relevant, what is relevant is the amount of force applied, be it the driver attached to the baffle or the air motion inside a box.

Dave
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Old 30th April 2008, 07:34 PM   #389
MJL21193 is offline MJL21193  Canada
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Default Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: No More Re's!!

Quote:
Originally posted by dlr


Gedlee is certainly correct and as Bratislav said, you've misinterpreted the chart,
You all seem to be misinterpreting what I'm talking about. I even gave a very graphic example (the bass driver that will make a box "walk"), in the original post. How can you suggest that there is the same amount of mechanical energy at all frequencies?
That is the point after all, the amount of mechanical energy from the driver, right?

Quote:
Originally posted by planet10


He is when he says force stays the same (ignoring the dipole), but it takes energy to do the work of exciting a resonance... so the only columns that are relevant to the discussion are the energy columns, and they decrease with frequency.

dave
Thanks Dave.
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Old 30th April 2008, 07:36 PM   #390
ShinOBIWAN is offline ShinOBIWAN  United Kingdom
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Default Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: No More Re's!!

Quote:
Originally posted by MJL21193
...the bass driver that will make a box "walk"...
"The tweeter made the box walk" just doesn't have the same ring about it.
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