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Old 27th June 2015, 10:50 PM   #1
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Default RCFLF21N451

Anyone have much experience with this driver?
It seems like a steal compared to B&C offerings.
RCF :: RCF LF21N451 1500W AES 21" Driver 8 Ohm 221.22 Excl VAT
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Old 28th June 2015, 12:48 AM   #2
GM is offline GM  United States
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Sheesh! 130 dB in the mid-bass out of a 3.5 ft^3/42 Hz box + 12" dia. vent and if WinISD is correct, not even exceed Xmax at a 230 degF VC heat rise.

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Old 28th June 2015, 01:19 PM   #3
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I wouldn't waste this in a 3.5 cubic foot box.
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Old 28th June 2015, 01:27 PM   #4
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And if you're at a wedding and they want you to set up in a corner for neatness, you can shake the bride and groom with 120dB of bass down to below 35Hz 10m away from the DJ - until they ask you to turn it down!
If you go with a superior design to the boring old vented cab - even better. Maybe an OThorn or a widened version of JBell's tapped horns.
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Old 28th June 2015, 02:02 PM   #5
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I picked up the P-Audio 21" neo driver at the Blue Aran clearance sale. A bit cheaper than the one you're looking at, slightly less Xmax, but 1800w power handling.

I'm simulating a constant-taper variation of a TH (T-QWT?), with the cross-sectional area set as 1400cm^2.
A single-fold design going from floor to ceiling would give a footprint of around 600x430mm (plus wood thicknesses), and a 3.5m path length tunes around 20Hz for a HT monster - ~130dB to 20Hz if you stick it in a corner.
This is with just 50v RMS input, so you'll need around 400w into 8ohm. Power compression will be minimal.

Haven't decided if I want this for PA or bonkers HT, though. 21"s are rather big to be moving anywhere without a van.

Chris
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Old 28th June 2015, 02:19 PM   #6
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Quote:
Originally Posted by TimLewis View Post
I wouldn't waste this in a 3.5 cubic foot box.
I merely noted its performance potential, but it all depends on the needs of the intended app as to whether it's a 'waste' or not...........

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Old 28th June 2015, 03:16 PM   #7
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Hi All,

FYI:

b
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Old Yesterday, 08:05 PM   #8
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That's a good chart. I amended the Hornresp sims, though the response didn't change that much.
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