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PD1850 vs PD1851 - Diffs/Advantages/Disadvantages
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levyte357- View Drop Down
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    Posted: 13 August 2012 at 6:48pm
PD1850 vs PD1851 - Diffs/Advantages/Disadvantages

Instead of hijacking someone elses thread, let's discuss this here.


Originally posted by PauliePaul PauliePaul wrote:

Originally posted by ras i ras i wrote:

I don't know about 1851s but I had some 1850s reconed by a pro with his own coil and cone and they have out lived genuine 1850s in the same box and they sound just as good if not better.
As for the 1851s, they were not perfect to begin with so maybe someone who knows what they are doing could improve them with a better coil or cone. Not saying they definitely can, but MAYBE!
So, in essence, they are no longer PD.1850's, right? The 'mongrel' of a driver you now own may be better suited to the cab than the genuine PD.1850 was in the first place.
 
As for PD.1851's not being perfect to begin with.... care to explain how they were not? Is it because people were expecting them to act, perform and sound like PD.1850's, but with a higher power rating??
 
 
PD.1851 coil on the left, PD.1850 on the right - different animals completely.
 
Edit: didn't have time to rotate the pic.




Edited by levyte357- - 13 August 2012 at 6:49pm
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levyte357- View Drop Down
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Originally posted by PauliePaul PauliePaul wrote:

So, in essence, they are no longer PD.1850's, right? The 'mongrel' of a driver you now own may be better suited to the cab than the genuine PD.1850 was in the first place.

As the driver sounds/acts exactly the same as the original, but with slightly more control/lifespan, would say it is an 1850 with custom recone kit.

As a Mondeo with a Mustang engine is still a Mondeo, just a tad faster. LOL

Think many people expected '51 to be a '50 but more.

On seeing T/S parms when 1st released, I hinted to everyone it was a completely different beast, but no one listened. LOL




Edited by levyte357- - 13 August 2012 at 6:51pm
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LjudLahger View Drop Down
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I heard from here at first that 1851 had more dB/w but lately it's the other way around?

So whats the right answer here?

/thanks
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Originally posted by LjudLahger LjudLahger wrote:

I heard from here at first that 1851 had more dB/w but lately it's the other way around?

So whats the right answer here?

/thanks


The PD1850 is much more efficient than the PD1851, however the PD1851 can withstand more power input, and has a naturally more musical tone.




The difference in sensitivity on paper, may not appear significant, but definetly apparent, when choosing amplifiers to power them.

The difference in efficiency, between the high efficieny drivers like PD1850, V18-1000 and some of the rest is, PD1850/V18-1000 can be well powered, 2x per channel, by amplifiers like CA18, MA5000VZ.

A common factor of drivers which seem to require excessive power to move air is a "low" Vas value.

Consider the Vas values for PD1851, Turbomax 1500s Celestion CF18VJD, all which demand large amounts of power, as opposed to drivers with Vas of 200+.

However, even though V18-1200, Fane 18XB, PD186 have lower sensitivity than PD1851, in reality these are all easily powered by the above 2x amps mentioned, which suggests Vas plays equally important role as driver sensitivity, in woofer performance/air movement.


Edited by levyte357- - 13 August 2012 at 10:38pm
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Nothing wrong with 1851s. Just buy a K10/K20
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Originally posted by QSS QSS wrote:

Nothing wrong with 1851s. Just buy a K10/K20


+1

'51 is for people who want nice round tone, and higher power handling, and don't mind sacrificing some efficiency for it.

Just make sure your intended venues have the current to supply it. Wink


Edited by levyte357- - 13 August 2012 at 10:41pm
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I'm still yet to give our 51's some full fat 32a goodness, would love to hear them how they should
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Originally posted by godge godge wrote:

I'm still yet to give our 51's some full fat 32a goodness, would love to hear them how they should


Even venue with decent ring main will do the job.

Couple of weeks ago, I was drawing upto 28A peaks, off ring main, powering 8x scoops, thru 2x 13A plugs, with voltage drop to only 236V. Wink


Edited by levyte357- - 13 August 2012 at 11:08pm
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Naphon hi 1400 will play 4 51s :)
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These drivers are polar opposites. The PD 1851 has more in common with the PD 186 than the PD 1850.

Best Regards,
Elliot Thompson
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Originally posted by Elliot Thompson Elliot Thompson wrote:

These drivers are polar opposites. The PD 1851 has more in common with the PD 186 than the PD 1850.

Best Regards,


Compare Qes of PD1851, PD186, V18-1200, Fane 18XB, with PD1850, V18-1000.

Wink
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Originally posted by levyte357- levyte357- wrote:


Originally posted by Elliot Thompson Elliot Thompson wrote:

These drivers are polar opposites. The PD 1851 has more in common with the PD 186 than the PD 1850.

Best Regards,


Compare Qes of PD1851, PD186, V18-1200, Fane 18XB, with PD1850, V18-1000.

Wink


I have all the TS Parameters of the drivers you've listed in your spreadsheet. The characteristics of the 1850 & 1851 differs greatly.

You will need to start scaling the drivers in a loudspeaker program to view the graphical difference in various cabinet designs.

Best Regards,

Elliot Thompson
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