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RX18 - Driver T/S Parms for Optimal Performance
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levyte357 View Drop Down
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    Posted: 05 April 2007 at 8:02am
More directed at Tony, but intelligent responses welcomed.

In theory, PD1850 is the best driver for the best scoop.

Tried PD186 in RX18 yeterday, driven by VZ5, no eq, low cut 25hz (using berry 3way, not variable), Xver @ 100hz.

Expected chest thump and throw was apparent, dust shaking from ceiling, floor boards, walls rattling etc..

Maybe should have low cut @ 35hz, and xver @ 80hz.

Question really is, what Vas, Sd, Qts, fs,Xmax is really needed to extract optimum performance from RX18?

Only talking about scoopish drivers with lowish Qts, low Fs, high Xmax, mid to large BL, EBP 100+.

(Apart from 18NW100, cos we know you like those..)

I'm thinking Vas is most important, as this dictates which drivers like large/small rear chamber.






Edited by levyte357 - 05 April 2007 at 8:22am
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COWFOOT View Drop Down
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Rog is touting high vas drivers for scoops.
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levyte357 View Drop Down
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Originally posted by COWFOOT COWFOOT wrote:

Rog is touting high vas drivers for scoops.


PD186 has fantastic fs + huge Vas approx 354, but was only OK in RX18.

PD1850 has med  Vas approx  249, but 1850+RX18 is benchmark.


Not all scoops have huge rear chamber, so don't all need high Vas driver.
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TONY.A.S.S. View Drop Down
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What a thing to look at at the end of a hectic day. I hope my answer doesn't disapoint too many people. To be honest, I have never paid much attention to the subject. As a rule i useually get as many speakers together as I can and then give them all a blast. I found that this gives me a much broader view, and a practical knowledge of the speaker. I used to run a 50 k rig when we were heavily into the dance scene, but never run a sound system for reggae. so I am no expert. All I basically have is this thing in my head that tells me when someting is right. I am always concerned about getting bogged down with to much theory. If I went the theoretical route half my boxes would not exist. I am more concerned with pushing the boundries. Thats what gives me the buzz. Sorry about ramblig. I bet thats the last thing you ask me.

Edited by TONY.A.S.S. - 05 April 2007 at 2:27pm
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Tone i know exactly what u mean!
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laymans terms  MY EARS ARE BETTER THAN MY MATHS
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Originally posted by TONY.A.S.S. TONY.A.S.S. wrote:


 As a rule i useually get as many speakers together as I can and then give them all a blast.


I hear that Tony, but unfortunately not many of us can afford to buy a number of drivers to see which one works best in a cab.

And most dealers aren't interested in you bringing a cab and amp to try out different drivers.

As 1850's are not available new, it seems a good time to find out which other drivers fit the bill.

As the RX18 rear chamber is small compared to other scoops, I imagine that's one of the reasons low Vas, high Xmax drivers like  1850/18NW100 sound good in this cab, and probably V18.

This is probably why I wasn't over impressed by 186 in the cab due to 350+ Vas.

Can any one else recommend any drivers with similiar T/S to 1850/18NW000 ?

With Vas approx 225-275 ?






Edited by levyte357 - 06 April 2007 at 7:06am
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Lev,

I've never seen the inside an RX18, but of the front chamber is small then as you test confirms, lower Vas drivers will work best. Throat size, flare rate and length will also determin which driver works best, so its not all down to chamber size.

V18-1200 is in the Vas range you need. Its a little higher than the 1850 and plays lower in my tests. Its not just the Vas that allows it to play lower, all the specs have be tailored to work best in scoops/reflex.
 
Call Alex at pap on tuesday and ask him if the 2 sample V18-1200's went to Mark. If they didn't tell him to send them to you and that Rog said it was ok. I will also tell Alex this. Your'e in a good position with good scoops and some other good drivers around to do a fair comparison. I've not tried the V18-1200 against all drivers and in all scoops, so I want to see how it stands up.
 
Rog.
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Rog .Perhaps I should look at these speakers. Our RX jnr. has a chamber that is twice as deep as the RX 18. It would be good to optimize the small cab, as we push slightly harder for performance.
Tony.
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So Tony, over on the thread titled 'Who is King of 18" Mini Subs' you were obviously talking about the external dimensions ?
 
Quote Our RX18 jnr is just a shortened version of the STD RX 18. If we make a larger cab it start to look like the RX18.
RX18 jnr. is 18" shorter than the standard cab. It is the same depth and width.
 
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Yes that is correct. I will be posting pictures of the first batch this week.
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Originally posted by TONY.A.S.S. TONY.A.S.S. wrote:

Perhaps I should look at these speakers. Our RX jnr. has a chamber that is twice as deep as the RX 18.
 
Have you let that slip or something as you've never mentioned that before ? Also they push more louder or deeper did you say than the standard RX18 at 50hz ? (Correct me if I'm wrong)
 
I really think mini-subs/mini-scoops will be the way in the future for scoop lovers.
 
Will you / have you consider(ed) trying out some of the deepest drivers out there (in dimension I mean) such as the Volt RV series & the new so called 'Fane' TurboMax 1200XBS's & B800HX's (900's) super woofers ? 
 


Edited by Tekasis - 07 April 2007 at 5:35am
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