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What to load my tiny scoop with?

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ToNy MoNtAnA View Drop Down
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    Posted: 19 December 2007 at 10:46pm
A few weeks ago I bought a tiny scoop off Static Age. It's well built being made of 15mm birch ply, with a plywood scoop part.

However the driver in it was only 28w rms and seems to be blown. As it's quiet and buzzes a bit when tested, even when I removed the xover inside. When I compaired it to another small sized speaker which was a bookshelf sized hifi sub with a 5.25 inch driver also.

So ditched the driver and looking for another suitable 5.25 inch driver.

Two drivers come to mind:

Beyma 5MP60N rated 50w rms, but has no vented pole piece and is 5 inch, so hopefully the .25 inch more won't make it fall through the cutout hole. Although the Beyma does have a square front frame simular to Fane drivers, so it might fit.
They can be got for £25.10 from Proaudioparts.
Rubber surround,polyproplene cone, 4mm xmax, vas 9.8 litres, qts 0.29, fs 60hz, BL 6.4, max excursion 20mm, sensitivity at 1w/1m 91db, 1 inch coil, die-cast frame, 50hz-12khz,8 ohms.

That one looks pretty decent and seems to have the right ts parametres for scoop use.

Or this one that costs £12:

Skytronic 902.420 5.25 inch rated 100w rms. With yellow kevlar cone, rubber surround, vented pole piece, 4 layer coil, fs 55hz, qts 0.41, vas 5.6 litres, BL 8.7, spl 84.8db at 1w/1m, xmax 3.5mm, 8 ohms.

That one has twice the power handling, vented pole piece and more BL and has a slightly lower fs. But the other specs don't look as good, less SPL at 1w/1m and cheapo make.

Unless someone can think of another driver under £30 that might suit it better? Being at least 50w rms.

As for the amp to power it, I'm stuck...

I got a 150w rms into 4 ohm/100w rms into 8 ohm mono Velleman module amp, which I just need to build the PSU and case for. Hopefully I can build a suitable PSU for it still.
And this sub xover: http://www.bkelec.com/Modules/asbf.htm

Or maybe easier to buy this: http://www.bkelec.com/Modules/bsbp100.htm  and use that in seperate housing as it won't fit in the back of my tiny scoop.








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ToNy MoNtAnA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 19 December 2007 at 10:56pm
Bearing in mind, this will be for a pc 'sub'/ bass bin used for movies and music. So want at get at least 50hz bass.

At the moment I got some small 4 inch + 1 inch rear ported reflex, active 30w rms a channel wooden pc speakers.
They go pretty loud but lack any bass you can feel much. I'd say they roll off at about 90hz-80hz.
Although they say 40hz-20khz on the back and 30w rms on each speaker back. That 40hz is mostly likely marketing lies or some -30db figure. LOL




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Post Options Post Options   Thanks (0) Thanks(0)   Quote Disco Stu Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 12:04am
I cant see that a scoop for a 5" driver is going to do anything for the bass end its just too small, any benefit the horn loading might give will be way out of the intended bandwidth for the application, so im guessing youre using it cos it looks cool

Thats fine, but in that case id get the better driver.

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ToNy MoNtAnA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 1:33am
Should get to 50hz though.... Or 60hz at least.

Will go with the Beyma, hope it being 1/2 inch smaller that it won't fall through the baffle. As old driver was 5.25 inch. Beyma is 5 inch.  Cheap as chips at £25 anyway. Tongue
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Timebomb Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 1:52am
those skytronics can take a fair amount of abuse, i put one in a tuba sub and its fine on low power, the cones very flexable though so with highpower it distorts like crazy.  Might be ok in a scoop though as theres no rear chamber so less pressure on the cone. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:04am
Originally posted by Timebomb Timebomb wrote:

those skytronics can take a fair amount of abuse, i put one in a tuba sub and its fine on low power, the cones very flexable though so with highpower it distorts like crazy.  Might be ok in a scoop though as theres no rear chamber so less pressure on the cone. 


I'm presuming you made the Tuba 18 or Auto Tuba and used the 8 inch version of that Skytronic speaker? The 5.25 inch kevlar cone Skytronic must be simular, just a bit less power handling.

The Beyma is a quality make however and hopefully won't distort at medium-high ish levels in a scoop.
It has no vent and is rated 50w rms though, so might have to go for a 50w rms amp for it, incase it overheats. Unless it's got some kind of vent under the spider or around the voice coil former.
100w rms amp might overheat it...
Having a qts of 0.29 is suits a scoop pretty well.  And a 4mm xmax and 20mm peak to peak max excursion sounds pretty good.
But the fs is 60hz, so I doubt I'll get much out of it below it's fs.
Should be fine anyway as my current pc speakers are noticable down to 90-80hz, then very faint which could explain their 40hz-20khz rating on the back.






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Post Options Post Options   Thanks (0) Thanks(0)   Quote kpippen Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:14am
Tony,...If you want it to be seriously wicked...LOL
 
 
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turn on, tune in, drop out


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Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:18am
Originally posted by kpippen kpippen wrote:

Tony,...If you want it to be seriously wicked...LOL
 
 
Kev


That would take a deep longggg box. But thats given me an idea. Tongue
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kpippen Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:22am
I know exactly what your thinking...varoom!
turn on, tune in, drop out


Hey Nipper,...we gotta have more cowbell!!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:26am
201.416 Zeuz X 350w max/175w rms, 6 inch. But has no ts parametres... And is 4 ohm.

http://www.speedydelivery.co.uk/car-audio/subwoofers---zeuz.shtml


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Post Options Post Options   Thanks (0) Thanks(0)   Quote ToNy MoNtAnA Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:27am
Originally posted by kpippen kpippen wrote:

I know exactly what your thinking...varoom!


Me wonders if one of those long magnet subwoofer p-audio drivers might fit and work in the Auto Tuba. TongueTongueTongue


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Post Options Post Options   Thanks (0) Thanks(0)   Quote kpippen Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2007 at 2:29am
Nailed it... I like the 201.927... 1000 watts! Can you imagine...LOL
 
Cheers!
 
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Hey be sure to PM me when you get it done...
turn on, tune in, drop out


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