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max spl from 1850 |
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djdan 
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Joined: 18 October 2005 Location: United Kingdom Status: Offline Points: 190 |
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 Topic: max spl from 1850Posted: 18 October 2005 at 5:36pm |
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was thinking about building some of these. got around £200 to spend on each driver does anyone know any peak spls eg precision devices, void etc etc or is there any budget drivers that will give me enough bass to go with my cerwin vega psx 153 tops
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Tom Umney
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Joined: 26 February 2004 Location: United Kingdom Status: Offline Points: 4954 |
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Posted: 19 October 2005 at 5:17pm |
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Use the Void V18-1000, a great driver with huge BL, 5 inch voicecoil, 1000w rms, good xmax. I'd rate Void V18-1000 better than PD1850 as the PD's need even more power to get them sounding right. The Void V18-1000 [or was it a custom version Whereas PD1850 rated 800w rms would need at least be driven with 1500w rms to sound good.
Edited by ToXiC - 19 October 2005 at 5:22pm |
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JD01
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Joined: 23 August 2004 Status: Offline Points: 819 |
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Posted: 21 October 2005 at 10:16pm |
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Does anyone has a mod for the 1850horn for using the Void V18-1000?
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norty303
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Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8806 |
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Posted: 23 October 2005 at 5:25pm |
But the horn was designed for the 1850, hence the name. The Looney was modified for the V1000 so it's not like you can just drop a Void in the 1850 and have a Looney. Also, isn't there a problem with availability of the Voids at the moment or has that been resolved? |
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djdan
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Posted: 24 October 2005 at 11:20am |
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so what would have to be modified to make it exactly right for the void driver
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norty303
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Posted: 24 October 2005 at 12:48pm |
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Nobody knows apart from the Looney guys as Rog did the mod for them so they could sell Looneys as a product.
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tb_mike
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Joined: 01 October 2004 Location: New Zealand Status: Offline Points: 2744 |
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Posted: 24 October 2005 at 7:26pm |
Does anyone know why this is?is it cos the PD1850 has a flux shorting ring so sounds toooo clean unless you power it into over excurson slightly???? |
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roborg
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Posted: 04 November 2005 at 9:39pm |
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I think the average sensitivity is virtually identical for all suitable drivers, so the undistorted peak spl is more a function of the drivers xmax and motor design. Also, of course, where u cross.
I reckon the loudness thing is a distortion effect, will get differing ammounts of distortion with alternative drivers.
The drivers i've tried in 1850's all start to sound 'loud' when they get towards their xmax (used a perspex access plate to see the things moving
 , i trust computer sims so far....) I've never tested a pd1850 or a void tho  Maybe the 1850 is very linear up to its xmax so as tbmike points out needs to get v-close or exceed xmax to get the distortion most people hear as loudness.
Difference between driving a cab with 1200 and 1500 shouldn't really be that noticable, assming its within its xmax (unless you're hitting the backplate with 1500
 .... I found that roughly 1-1.5K is about what it takes to get most drivers doing 10mm excursion (edit) in an 1850 on 'normal' program materials peaks, so maybe 1500watts is what it takes to get a pd1850 doing its loud thing.
Does the looney bin have a larger rear chamber? Might get to its xmax with less power that way....
cheers
Rob
Edited by roborg - 05 November 2005 at 2:17pm |
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What I cannot create, I do not understand
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Jay Lawless
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Joined: 22 August 2005 Location: United States Status: Offline Points: 1702 |
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Posted: 10 November 2005 at 3:16am |
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to my understanding loony rear chamber was about the same as a 1850
rear chamber. i cant remember if its either 2 Litres smaller or larger,
but its a small diffrence.
Edited by NeverWinter - 10 November 2005 at 3:16am |
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Previously known as NeverWinter
Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist |
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djdan
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Posted: 10 November 2005 at 7:05am |
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so you reckin i should try to find this out and modify the dimensions to allow make it that size or should i just build it the way it is. they only have to work indoors to a couple o hundered people
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roborg
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Posted: 10 November 2005 at 11:52am |
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A couple of litres will be unnoticable compared to how you place the speakers in the venue, err on the side of more volume as you'll get lower distortion & marginally lower power comrpession.
Thing to look for is the driver fit in the speakerbox. When i built my first 1850 clones i measured the driver height & left 50mm between the bottom of the speaker box & the driver vent.
Best to make the speakerbox deliberately too large as it's trivial to screw scrap pieces of ply inside to reduce the volume later (if u feel it's necessary.)
Also make sure (this is a biggy) that you don't put a baffle mounting hole right at the front of the cab, as its a bast*** to tighten it up! One of my 1850's ended up that way
 & the two times i've replaced the driver in that cab have taken a good hour to find a tool to reach the set-screw, used 1/4" nut driver with two universal joints and a sh*t load of extenders last time  doh!cheers,
Rob
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What I cannot create, I do not understand
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djdan
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Posted: 10 November 2005 at 1:25pm |
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i don't really understand what is meant by this. do you mean measure how the driver sits then make its encloure the driver size plus 50mm. does this give much rather than following the plans as i would be worried about harming my baby void v18-1000 or is it really noticable |
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] in the Looney bins[very simular design to 1850 horn]at Notting Hill Carnival. Each 1000w rms Void was driven by 1200w rms each and the whole stack was breathtakingly good!!!
Use the Void V18-1000, a great driver with huge BL, 5 inch voicecoil, 1000w rms, good xmax.