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Pd 1850 tuned lower?
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Old Croc
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Points: 2459 		Post Options Post Options   Thanks (0) Thanks(0)   Quote boots-hifi Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2014 at 3:05pm
Originally posted by prestigedjsdk prestigedjsdk wrote:

cubo 18 for pd1850 is shit as a sub <font face="Verdana, Helvetica, Arial, Geneva, sans-serif"><span style="line-height: 14px;">http://www.freespeakerplans.com/bass-cabinets/11-cubo-18 it only works from 85hz to 145hz that is not what i call a sub <img src="smileys/smiley19.gif" alt="Cry" title="Cry" /></span>


You clearly havent got a clue or are rather miss informed. I ran 8185 loaded cubo's built by bee from 38-80hz and they destroyed many bigger boxes ive had. 1850 loaded cubo's would rock a mobile rig and they don't benifit from group coupling is a bonus too.
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Points: 77 		Post Options Post Options   Thanks (0) Thanks(0)   Quote prestigedjsdk Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2014 at 4:06pm
If you look at the diagram with the void v1000 which is almost identical to the pd 1850 ts. You will see that it starts to deliver its sound at 110hz and up. Which is not sub duty, its peak is at 125hz  an lower than 85hz there is no power in it really. at 45hz it is 4 db´s lower then 18lw1400. How is that better then everything else?
http://www.freespeakerplans.com/bass-cabinets/11-cubo-18
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Points: 2459 		Post Options Post Options   Thanks (0) Thanks(0)   Quote boots-hifi Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2014 at 12:01am
I dont know where that plot comes from maybe the Sun or the Mirror but in the real world if you run a cubo past 120hz it will honk and sound awfull.
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Originally posted by prestigedjsdk prestigedjsdk wrote:

cubo 18 for pd1850 is shit as a sub http://www.freespeakerplans.com/bass-cabinets/11-cubo-18 it only works from 85hz to 145hz that is not what i call a sub Cry
 
sorry but this is rubbish, the cubo extended loaded with the 1850 or the 1852, drop to 35hz and are good up to 90ish past 100 and they get a bit honky. (driver magnet in horn)
 
(driver magnet in chamber)they play to 120hz but only drop to 40hz.... its a trade off....
 
ps.... the graph showing a driver only playing to 85hz was a v1000'sWink, and were from the 3rd prototype version, not the published version. The published version is even better.....


Edited by bee - 09 July 2014 at 3:50pm
https://www.elements-audio.com
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Originally posted by prestigedjsdk prestigedjsdk wrote:

If you look at the diagram with the void v1000 which is almost identical to the pd 1850 ts. You will see that it starts to deliver its sound at 110hz and up. Which is not sub duty, its peak is at 125hz  an lower than 85hz there is no power in it really. at 45hz it is 4 db´s lower then 18lw1400. How is that better then everything else?
http://www.freespeakerplans.com/bass-cabinets/11-cubo-18
 
 
the v1000, and pd1850 ts parameters are not even close.....
this is a great example of why you should take specs with a pinch of salt, and actually test drivers and use your ears, and full rta them....
https://www.elements-audio.com
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Surely, the Horn is the Horn and there is not much you can do to lower frequency, apart from make the Horn a lot larger (with the given speaker). It might be confusion over terminology, but you can only tune a reflex enclosure.
http://www.facebook.com/tony.rossell.3
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PD1850          vs            Void V1000


Fs 33.15 Hz                    Fs 34.53 Hz

Re 5.22 Ω                       Re 5.5 Ω

Qms 15.42                     Qms 7.63

Qes 0.24                         Qes 0.22

Qts 0.24                          Qts 0.215

Le 1.33 mh                     Le 1.18mh

L2 2.45 mh                     L2 2.20mh

R2 5.3 Ω                         R2 !!!!!!!

Vas 203.84 litres            Vas 201.7 litres

Mms 215.24 g                 Mms 226.23g

Sd 1164.16 cm2             Sd 1230 cm2

Cms 107 µm/N              Cms 93.89 µm/N

BL 30.99 T/m                BL 34.8 T/m

Xmax 11.05 mm           Xmax 10.5 mm

Vd 1.28 litres                Vd !!!!!!!

Ref. Efficiency 2.88%   Ref. Efficiency 3.62%



Edited by bee - 09 July 2014 at 11:53pm
https://www.elements-audio.com
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are these specs measured by you ben?
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both taken from data provided by pd and void....
https://www.elements-audio.com
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Originally posted by prestigedjsdk prestigedjsdk wrote:

Hi all. Is it possible to redesign and tune the 1850 horn lower så i will hit 40-30ish? I think 50 is way too high. Hope you guys can help because the saw is ready to make some dust.
 
longer horn and horm mouth = lower response. but driver may not be able to take it.... would need to sim... then build and measure...
 
increasing horn length to 3 meters, the cab drops to 35hz, but the response is very peaky. To smooth out response more changes are needed.


Edited by bee - 09 July 2014 at 5:55pm
https://www.elements-audio.com
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6 cabs in a stack, modified 1850 horn..... 3.2 meter horn..... with changes to horn and change of driver....
 


Edited by bee - 09 July 2014 at 6:03pm
https://www.elements-audio.com
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Originally posted by bee bee wrote:

PD1850          vs            Void V1000


Fs 33.15 Hz                    Fs 35 Hz

Re 5.22 Ω                       Re 5.3 Ω

Qms 15.42                     Qms 5.779

Qes 0.24                         Qes 0.341

Qts 0.24                          Qts 0.322

Le 1.33 mh                     Le 2.49 mh

L2 2.45 mh                     L2 !!!!!!!

R2 5.3 Ω                         R2 !!!!!!!

Vas 203.84 litres            Vas 289.5 litres

Mms 215.24 g                 Mms 196 g

Sd 1164.16 cm2             Sd 1158 cm2

Cms 107 µm/N              Cms 152 µm/N

BL 30.99 T/m                BL 23.63 T/m

Xmax 11.05 mm           Xmax 12.95 mm

Vd 1.28 litres                Vd !!!!!!!

Ref. Efficiency 2.88%   Ref. Efficiency 2.21%


Void Specs are not correct or is it just me? Wacko
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