B&C 18TBW100, New 3kw 18" with 57mm Xlim(Ferrite) - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 05-12-2012, 01:13 PM - Thread Starter
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3000 W continuous program power capacity
100 mm (4 in) split winding copper voice coil
35 - 1000 Hz response
96 dB sensitivity
57 mm peak-to-peak excursion before damage
Double silicone spider with optimized compliance
Ventilated voice coil gap for reduced power compression
Aluminium demodulating ring for very low distortion

Specifications

460 mm (18 in) Nominal Diameter
8 ohmNominal Impedance
6.5 ohmMinimum Impedance
3000 Continuous Power Handling
1500 Nominal Power Handling (AES)
96 dBSensitivity (1W/1m)
35 - 1000 HzFrequency Range
100 mm (4 in)Voice Coil Diameter
Copper
Winding Material
Glass FibreFormer Material
Ceramic RingMagnet Material
31 mm (1.22 in)Winding Depth
15 mm (0.59 in)Magnetic Gap Depth
1.15 T Flux Density

Parameters

35 Hz Fs
5.3 ohm Re
0.41 Qes
8 Qms
0.39 Qts
175 dm3 (6.18 ft3) Vas
1210 cm2 (187.60 in2) Sd
1.76 % η0
± 12 mm Xmax
± 14 mm Xvar
245 g Mms
26.4 Txm Bl
2.45 mH Le
85 Hz EBP


http://www.bcspeakers.com/product.php?id=0000000356

 

Originally Posted by Bill Fitzmaurice:
It's also the very sort of Voodoo Engineering that should never be done.

 

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post #2 of 9 Old 05-12-2012, 01:26 PM
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Less than the 21" which ricci did testing on and if i remember correctly it becomes really noisy before it ever reaches the 60mm peak to peak number
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post #3 of 9 Old 05-12-2012, 02:16 PM
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This is a nice driver, we'll likely pick one up. Its obviously not going to throw very far, but the real question is the cost - it should be very reasonable compared to the neo counterparts.

data-bass.com
@databass_audio
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post #4 of 9 Old 05-12-2012, 02:28 PM
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Is this the driver that CSS is going to start selling?

By the way, did anyone notice the 1.15T flux? I wonder if they use a 1 or 2 layer VC because that mms is nice and low (high flux enables less VC layers and thus less weight).

YID DIY
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post #5 of 9 Old 05-13-2012, 06:44 AM
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Some interesting stuff is coming out of B&C these days. There are also the 21ipal, 18ipal. Super expensive but the motor force is insane and the geometric Xmax is 15 mm and xmech is 40 mm one way. Still not quite up there with the stroke of the long throw bass pumps but getting close. The 21sw152 really only has a geometric Xmax of 9.5mm which is why it gets noisy and distorted past 15 mm. It is way out of its linear envelope by then.


Also see the 18sound 18TLW3000
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post #6 of 9 Old 05-13-2012, 06:48 AM - Thread Starter
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Quote:
Originally Posted by Ricci View Post

Some interesting stuff is coming out of B&C these days. There are also the 21ipal, 18ipal. Super expensive but the motor force is insane and the geometric Xmax is 15 mm and xmech is 40 mm one way. Still not quite up there with the stroke of the long throw bass pumps but getting close. The 21sw152 really only has a geometric Xmax of 9.5mm which is why it gets noisy and distorted past 15 mm. It is way out of its linear envelope by then.


Also see the 18sound 18TLW3000

Damn...


 

Originally Posted by Bill Fitzmaurice:
It's also the very sort of Voodoo Engineering that should never be done.

 

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post #7 of 9 Old 05-13-2012, 09:41 AM
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Quote:
Originally Posted by WiSounds View Post

Damn...


Whoa!! That thing looks like it belongs in a Star Wars movie! I love it!
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post #8 of 9 Old 05-13-2012, 07:50 PM
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Quote:
Originally Posted by Ricci View Post

The 21sw152 really only has a geometric Xmax of 9.5mm which is why it gets noisy and distorted past 15 mm. It is way out of its linear envelope by then.

Hi Josh,
Man this is really disappointing
How did you come upon this info?
I thought we saw a pic of the coil, It certainly looked like the claimed length. Gap is 10mm longer?

Regards,
Dan
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post #9 of 9 Old 05-16-2012, 10:57 AM
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Quote:
Originally Posted by NEO Dan View Post

Hi Josh,
Man this is really disappointing
How did you come upon this info?
I thought we saw a pic of the coil, It certainly looked like the claimed length. Gap is 10mm longer?

This is just the regular old mathematic calculation. B&C lists the gap height and coil wind for all of their woofers but is using a Klippel as the basis for their claimed figures and the exemplary behavior shown in Klippel data for a few of their woofers seems to bear it out well. I just never looked at the actual geometric xmax on a 21sw152 until the other day. It makes sense why it starts sounding bad past maybe 15-16mm because it is way past it's 9.5mm geometric xmax already.
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