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RCF LF18x451

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Taariffj View Drop Down
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    Posted: 08 February 2019 at 1:00am
The lf18x451, anyone using this driver in scoop?
Or what is the best scoop for it? Please help with
Some suggestions. Thx.
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levyte357- View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 10:08am
Originally posted by Taariffj Taariffj wrote:

The lf18x451, anyone using this driver in scoop?
Or what is the best scoop for it? Please help with
Some suggestions. Thx.


This driver will "work somewhat" in a number of existing Scoops, but not optimally.
Superscooper design modded to provide slightly larger chamber, would work.
 
Also reference efficiency of 1.90%, would put me off using this straight away.

Also would estimate the Xmax is closer to 11.5, not 14mm.

Also note cutout is 424mm, quite large.
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love2all View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote love2all Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 10:38am
I had these in scoops - went back to PD very quickly. Very power hungry and not optimum situation using heavyweight amps on 13amp supply - just doesnt get the best out of them...

You will need a big powersoft and hang 2 a side to give them the right headroom. Even when set up this way the driver will be surpassed by PD1850 and 1852. They Sound good and musical but not going to bring the house down...xmax figures are realisitic the cones certainly do move a lot.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 10:51am
Originally posted by love2all love2all wrote:

I had these in scoops - went back to PD very quickly. Very power hungry and not optimum situation using heavyweight amps on 13amp supply - just doesnt get the best out of them...

You will need a big powersoft and hang 2 a side to give them the right headroom. Even when set up this way the driver will be surpassed by PD1850 and 1852. They Sound good and musical but not going to bring the house down...


I could see all of this happening, just by looking at the TS Parms. Geek
Driver like this, really needs optimal box, to give worthwhile results.

Ref efficiency 1.9% tells you will be very power hungry, and difficult to get going.

Qes = 0.29 tells will have warm sound, but not as efficient as some

PD1850/51/52, all have higher Ref efficiency, so will be more sensitive.

https://www.speakerplans.com/index.php?id=faq1
no: Free air reference efficiency.



Edited by levyte357- - 08 February 2019 at 10:53am
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love2all View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote love2all Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 10:59am
Exactly why i send you TS params yday! Thanks for the insight
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Taariffj Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 1:29pm
How would the driver work in your lev .44 scoops?
I have 10 of these they work ok in rog super scoop,
But I want the best performance out of them.
I’m running 2 a side on a k20.

Edited by Taariffj - 08 February 2019 at 2:26pm
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love2all View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote love2all Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 2:03pm
2 a side on k20 is the right amplification - whats freq band are you playing through them?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Taariffj Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 2:24pm
I have been running them at 40-125 hz on the drive rack.

Edited by Taariffj - 08 February 2019 at 2:25pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 2:47pm
Originally posted by Taariffj Taariffj wrote:

How would the driver work in your lev .44 scoops?
I have 10 of these they work ok in rog super scoop,
But I want the best performance out of them.
I’m running 2 a side on a k20.


They would work fine, in my Lev .44, as I have tried drivers with "very similar" parms, but more sensitive.

If I were in your position, I would ideally sell these, and get more efficient drivers, more suited to the cab.

Void V18-1000s/B&C 18TBX100 In Superscooper, would allow 6x cabs per K20.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 3:15pm
There would also be fairly simple Scoop mod, to change driver chamber from 44L to approx 65L, keeping Scoop throat same volume, which would allow even more drivers, to be optimal in your cabs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Taariffj Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 5:03pm
Are you saying with the 451/ k20 on 4 the pd 1850/2
Will have better performance/ spl/ louder?

Edited by Taariffj - 08 February 2019 at 5:08pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Taariffj Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2019 at 5:10pm
Originally posted by love2all love2all wrote:

I had these in scoops - went back to PD very quickly. Very power hungry and not optimum situation using heavyweight amps on 13amp supply - just doesnt get the best out of them...

You will need a big powersoft and hang 2 a side to give them the right headroom. Even when set up this way the driver will be surpassed by PD1850 and 1852. They Sound good and musical but not going to bring the house down...xmax figures are realisitic the cones certainly do move a lot.


Are you saying with the 451/ k20 on 4 the pd 1850/2
Will have better performance/ spl/ louder?
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