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1x21" vs 2x18" |
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APMAUDIO 
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Joined: 19 March 2009 Location: UK Status: Offline Points: 40 |
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 Topic: 1x21" vs 2x18"Posted: 27 March 2009 at 7:45pm |
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Anyone had the chance to compare a 1x21" reflex against a 2x18"??
Thinking along the lines of B&C SUB218 or SUB21...
It looks to me like a single 21 will move more air but not generate the same SPL?
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ceharden
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Posted: 27 March 2009 at 10:50pm |
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The 21" will most likely go lower but the 2x18" will be louder over most of the range.
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mykey
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Joined: 18 August 2005 Location: UK/Indonesia Status: Offline Points: 9680 |
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Posted: 28 March 2009 at 6:11am |
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2 x 18, more cone/piston area
2 x 18'' cone area will be 2450 cm2 (sd)
21'' cone area will be roughly 1680 cm2 (sd)
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APMAUDIO
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Posted: 28 March 2009 at 10:44am |
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True,but an 18TBX100 has an x-max of 9mm whereas the 21SW150 is 15mm so if my maths are correct(?) the 21" moves a little more air than two 18's?
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mykey
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Posted: 28 March 2009 at 11:01am |
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2 x 9 =
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APMAUDIO
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Posted: 28 March 2009 at 11:11am |
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I'm no expert but I calculate the VD of an 18TBX100 to be 1089cm2(x2 for two drivers)=2178cm2
21SW150 VD=2520cm2 Or do I have my wires crossed somewhere? |
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APMAUDIO
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Posted: 28 March 2009 at 11:25am |
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I do have something crossed as those should all have been cm3!!!
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mykey
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Posted: 28 March 2009 at 11:36am |
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wow, that must be a pretty deep cone, I'll have to check it out
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mykey
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Posted: 28 March 2009 at 11:45am |
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have they changed the code?
I have 21sw152 and 21sw115
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levyte357
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Posted: 28 March 2009 at 11:58am |
A few people I know only buy 4 ohm 21"s. They say the drivers drink uber amounts of power, before they start doing anything usefull. |
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"Who am I? I'm the guy who does his job.. You must be the other guy".
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ceharden
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Posted: 28 March 2009 at 1:40pm |
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Yeah, they've updated the 21SW150 to the 152 and brought out the slightly less meaty SW115.
The B&C ones only come in 4Ohm versions from what I've seen. |
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APMAUDIO
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Posted: 29 March 2009 at 1:37pm |
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Is it me or have the cab designs vanished from the B&C website again??
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APMAUDIO wrote: