file pd 1850 chamber size...

8 years 6 months ago #12906 by bee
pd 1850 chamber size... was created by bee
ok ive been playing around with a new scoop design, the chamber size is coming out at about 40.5 liters with driver in, 58.5 litres without driver, is this too small for the 1850 driver in a scoop...........

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8 years 6 months ago #12907 by saul
Replied by saul on topic pd 1850 chamber size...
yes

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8 years 6 months ago #12908 by bee
Replied by bee on topic pd 1850 chamber size...
what should i be look at..... around 70 - 80 litres with driver or bigger....

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8 years 6 months ago #12913 by heathrow_b_line
Replied by heathrow_b_line on topic pd 1850 chamber size...
Hi Bee, long time no speak mate

In my experience 40litres with the PD1850 is not bad, definitely worth building/trying.

You maybe shocked to know some of the most impressive scoops ive heard have approx 40 to 50 litres without te driver

Also there is alot more then just the chamber which effects the performance of the scoop

So why not mock it up and try it?!

Produce a killer sound. Take no prisoners.

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8 years 6 months ago #12914 by bee
Replied by bee on topic pd 1850 chamber size...
ive done a ruff design in autocad, ive opted for the non sim route on this one, just a bit concerned on the volume chamber, seems a bit small...... i can re draw and make it about 70 litres.

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8 years 6 months ago #12917 by heathrow_b_line
Replied by heathrow_b_line on topic pd 1850 chamber size...
I've never sim'ed anything

i like trial and error

whatever people say they cant sim a scoop perfectly. All the previous attempts fell flat on their ass's [excuse the pun]

Produce a killer sound. Take no prisoners.

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8 years 6 months ago #12924 by levyte357
Replied by levyte357 on topic pd 1850 chamber size...
@Bee, keep us updated on progess mate..

\"When in Vegas, do as the vegasians do\".

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8 years 6 months ago #12941 by bee
Replied by bee on topic pd 1850 chamber size...
will do lev.... what would you say is the best chamber size for the 1850.......

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8 years 6 months ago #12946 by saul
Replied by saul on topic pd 1850 chamber size...
surely that depends on all the other parameters like throat, horn length, expansion, etc, etc , etc

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8 years 6 months ago #12949 by levyte357
Replied by levyte357 on topic pd 1850 chamber size...

saul wrote: surely that depends on all the other parameters like throat, horn length, expansion, etc, etc , etc


Chamber too small, will strangle the driver (Dub Defectors Supers + 1850s in Bristol)

Large chamber will require tricky throat expansion to maintain efficiency.. (e.g shortman mini)

Also important is "shape"/proportions of chamber.

Proportions I know that work are, rear chamber depth approx 200mm.

Scoops don't exactly follow folded horn design theory. Try to apply all of them, and you may end up with scoop that looks good on paper, but lacks efficiency 35-50hz.

Suggest you start by modifying Eminence design first.

EDIT:Have drawn up many designs I am confident in, but quotes I'm getting for building prototypes, means they are staying on my HD for now... :lol:

\"When in Vegas, do as the vegasians do\".

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