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arfeds View Drop Down
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Points: 8 		Post Options Post Options   Thanks (0) Thanks(0)   Quote arfeds Quote  Post ReplyReply Direct Link To This Post Topic: PD.1852/2 > PD.1845-1N
    Posted: 26 March 2024 at 9:05pm
I have a cab loaded with PD.1852/2 which i would like to swap with PD.1845-1N to save on weight 

As far as i can see the specs look pretty similar but has anyone had any experience with both?

is their anything i should be aware of moving to neo's?


https://www.precision-devices.com/products/all-products/pd-1852-2/
https://www.precision-devices.com/products/all-products/pd-1845-1n/
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smitske96 View Drop Down
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What kind of cab are you talking about?
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Originally posted by arfeds arfeds wrote:

I have a cab loaded with PD.1852/2 which i would like to swap with PD.1845-1N to save on weight 

As far as i can see the specs look pretty similar but has anyone had any experience with both?

is their anything i should be aware of moving to neo's?


Compare the parameters, and the reduction in voice coil diameter, inevitably leads to very noticeable reduction in BL, and even worse, the loss of impact at 35-40hz.

Model with hornresponse or physical test, and it can be seen, whilst mid BL drivers (24-26), can have very smooth, uniform, flat response, 40-100hz, in many sub cabs, high BL drivers (30+), have the motor strength, to remain in control, at higher power input,  30 -  40hz. I first posted on this, at least 10x years ago.

Calculate the actual Xmax, given Voice coil winding depth, and magnetic gap depth, and the bad news continues.

This driver will be OK for some, and a compromise on 51/52 heritage, for others.

To upgrade from 1852, personally I would be looking at 18 sound/B&C, who are actually increasing Voice coil diam/BL/Flux density, not decreasing it.


Edited by levyte357- - 14 May 2024 at 10:52am
Global Depopulation - Alive and Killing.
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smitske96 View Drop Down
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Points: 1217 		Post Options Post Options   Thanks (1) Thanks(1)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2024 at 11:05am
All depends, the 1845-N1 has a motorscore of around 149 while the 1852/2 has a motorscore of 179. So yes, the 1852/2 has a stronger motor, but depending on you cabinet, you could want/use the extra xmax.

Going with a larger coil also means less travel for the soft parts (spider) with the same total spider diameter. That's mainly one of the reasons a lot of manufacturers still go for 4,5" VC's on 18" drivers. Just bigger VC in diameter does not mean more thermal capabilities on its own. Several other factors come into play.

@levyte357
The 1845-N1 clearly comes on top xmax wise. Also quite sure that would be the case in real life.
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levyte357- View Drop Down
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 14 May 2024 at 12:03pm
Originally posted by smitske96 smitske96 wrote:


@levyte357
The 1845-N1 clearly comes on top xmax wise. Also quite sure that would be the case in real life.

Using:

((hc - hg)/2) + 2

For the 1845N, didn't quite add up to 16mm for me, did not compare it to the old unit,

But PD have a history of "embellising" Xmax and Efficiency, in 18" driver specs.

No big deal really, if you get PD1852s reconed in the UK, by the right engineer, with UK made kit, in the right cab, they are an astonishing driver.

But when I previously upgraded to 18sound 18NLW9601, difference was night and day.
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smitske96 View Drop Down
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Originally posted by levyte357- levyte357- wrote:

Originally posted by smitske96 smitske96 wrote:


@levyte357
The 1845-N1 clearly comes on top xmax wise. Also quite sure that would be the case in real life.

Using:

((hc - hg)/2) + 2

For the 1845N, didn't quite add up to 16mm for me, did not compare it to the old unit,

But PD have a history of "embellising" Xmax and Efficiency, in 18" driver specs.

No big deal really, if you get PD1852s reconed in the UK, by the right engineer, with UK made kit, in the right cab, they are an astonishing driver.

But when I previously upgraded to 18sound 18NLW9601, difference was night and day.

The calculation for 16mm xmax is clearly indicated in the specsheet. Using the older formulate you would get:

1852/2 --> 8,5mm
1845-N1 --> 11mm

But as said previousely. Regarding usable xmax I would definately bet on the 1845-N1. Just a more recent driver
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No question, take the 1845 - but it would be great to know the cabinet. 

It will easily provide identical results in terms of SPL, probably even more, depends on power compression in the end ( 5" big ferrite magnet vs. 4,5" neo )
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jonathanthaugland Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2026 at 10:21am
Hello.

Did you happen to purchase the Precision Devices PD.1845-1N? This model is currently out of production and we are struggeling to get our hands on them.

Would you be willing to sell to us?

Looking forwards to hearing from you!
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Points: 1128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2026 at 11:12am
Who said they were out of production? Out of stock in the UK until sometime in February if my sources are correct.
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We’ve contacted Thomann and PD directly and they are unable to supply, as they have move onto the 2N version. However, they’ve changed some minor details, meaning we cannot utilize this model to finish our series of equipment.

If you know of a way to get our hands on them, do let us know! Would be greatly appreciated
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Points: 1128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2026 at 3:16pm
Did you speak to Neil Barnes at PD, if not, give him a call, I was assured that the 1N was still available although currently out of stock, more due in next month.
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luton_soundman View Drop Down
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Points: 4550 		Post Options Post Options   Thanks (0) Thanks(0)   Quote luton_soundman Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2026 at 10:39pm
Paulus just done a a/b with both drivers couple weeks ago. As you said lev on the lows the old 52 completly outplayed it.
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