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Suggestions for driver please.
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bin juice24 View Drop Down
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    Posted: 04 March 2020 at 8:34am
Yo. I’ve a couple of eminence 18” 400w pro series, unused I think.
Rather than selling them or using them for drain covers, does anyone have any suggestions as to what I could put them in? (Other than a skip etc...)
Thanks.
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Elliot Thompson View Drop Down
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Eminence makes lots of 18-inch drivers. What is the model number of your Emimence 18-inch driver?

Best Regards,


Edited by Elliot Thompson - 04 March 2020 at 11:46am
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bin juice24 View Drop Down
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Ps184008

I’m tarting up 4 super scoops, so if there’s anything suitable that I could plonk on top, with these eminence?
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Here are the specs...
Power rating: 400w
resonance: 33hz
usable frequency range: 30hz to 800hz
average sensitivity 1w@1m: 98db
magnet weight: 95oz
magnet gap depth: 0.375",9.53mm
voice coil diameter: 3",76.2mm
fs: 34.50hz
re: 6.6 ohm
le: 1.63mH
qes: 0.41
qms: 7.32
qts: 0.39
vas: 374.72 litres
vd: 457.90cc
cms: 0.2053
bl: 19.06T-M
Mms: 103.68grams
rms: 3.0699N*sec/M
ebp: 84.5
xmax: 4.5mm
sd: 1140.09cm2
zmax: 124.9




Edited by APW - 04 March 2020 at 1:19pm
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bin juice24 View Drop Down
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That’s great and thanks but I have no idea what half of that means.
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These will help:

https://www.speakerplans.com/index.php?id=faq1

https://www.speakerplans.com/index.php?id=faq6

The specs I posted above will dictate the best cabinet type for your drivers.
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cravings View Drop Down
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knowing what half of it means is probably enough heh.
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bin juice24 View Drop Down
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Okay thanks for that, I’ll have a look when back in the office.
Is there a breakdown somewhere of what all these measurements and units are? And how they relate to eachother? And how they affect sound?
Please excuse my ignorance.
Cheers 
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studio45 View Drop Down
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Well, they are old Emmies so....: 400 watts is optimistic, the motor structure isn't particularly strong, the coil former is Kapton so not great at withstanding heat, the cone isn't very thick. Generally they're just sort of....not very good, compared to modern 18" drivers. From a time when the strategy was deploying many low-powered bins, rather than a few high-power ones.
 
A scoop bin is probably the best way of getting the most bass out of them per watt, but you'll have to be careful. 4.5mm Xmax is not a lot and you will probably be able to exceed that with less than a hundred watts input at the sub-bass end. But, don't be tempted to raise your highpass filter to get the Xmax down too much - or you'll run into issues with not enough cone movement to properly circulate cooling air through the magnetic gap. Available Xmax when mounted in the scoop, will absolutely dictate how loud you can run them. If you try to push them, they will just hit the backplate and burn out, quick style.

The suggested application is probably a very large reflex box with a big port. But again, you would have to watch out for over-excursion.
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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Elliot Thompson View Drop Down
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Originally posted by bin juice24 bin juice24 wrote:

Okay thanks for that, I’ll have a look when back in the office.
Is there a breakdown somewhere of what all these measurements and units are? And how they relate to eachother? And how they affect sound?
Please excuse my ignorance.
Cheers 


There are more Parameters broken down clicking on the below link...

https://en.wikipedia.org/wiki/Thiele/Small_parameters

There is also a book in which that breaks down all the figures but, the name escapes me. If I can find it, I will post the name and Author.

Eminence is an American Loudspeaker Manufacture. In the United States, the Reflex cabinet is the standard (most dominating) design in which, the parameters offered by your loudspeaker reflects being more suitable for a Reflex enclosure.

You could use the drivers in Scoops however, the performance level will be adequate compared to putting them in a reflex cabinet.

Sound is subjective so, no parameter will tell you how it will sound. The TS Parameters are there to guide you on the necessary requirements needed in order to attain the best performance from the loudspeaker. Once you create a means of compromise, the performance level is hindered.

There are those that can predict a sound by looking at the TS Parameters of a loudspeaker however, that requires years of experience of evaluating lots of speakers offering all types of TS Parameter figures.

If it does not sound simple, its not. The TS Parameters of a loudspeaker is like the DNA structure of a Human Being.

Best Regards,


Edited by Elliot Thompson - 04 March 2020 at 3:51pm
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bin juice24 View Drop Down
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Originally posted by studio45 studio45 wrote:

Well, they are old Emmies so....: 400 watts is optimistic, the motor structure isn't particularly strong, the coil former is Kapton so not great at withstanding heat, the cone isn't very thick. Generally they're just sort of....not very good, compared to modern 18" drivers. From a time when the strategy was deploying many low-powered bins, rather than a few high-power ones.
 
A scoop bin is probably the best way of getting the most bass out of them per watt, but you'll have to be careful. 4.5mm Xmax is not a lot and you will probably be able to exceed that with less than a hundred watts input at the sub-bass end. But, don't be tempted to raise your highpass filter to get the Xmax down too much - or you'll run into issues with not enough cone movement to properly circulate cooling air through the magnetic gap. Available Xmax when mounted in the scoop, will absolutely dictate how loud you can run them. If you try to push them, they will just hit the backplate and burn out, quick style.

The suggested application is probably a very large reflex box with a big port. But again, you would have to watch out for over-excursion.

Guess I’m naive to think they’d run happily if fed 400w then? What would be the ideal frequency range to get the most out of them?

Thanks all for your replies.
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Elliot Thompson View Drop Down
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Originally posted by bin juice24 bin juice24 wrote:


Guess I’m naive to think they’d run happily if fed 400w then? What would be the ideal frequency range to get the most out of them?

Thanks all for your replies.



You can run those speakers anywhere from 600 - 800 watts. Eminence rates their wattage based on RMS so 1.5 - 2 times the RMS is not a problem with Eminence Loudspeakers.

Best Regards,
Elliot Thompson
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