THE NEW CELESTION CF18VJD TESTED TO THE MAX |
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burningbush
Old Croc Joined: 25 May 2009 Location: Pictland Status: Offline Points: 5897 |
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2.5kW into each driver then?
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music is the message
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kevinmcdonough
Old Croc Joined: 27 June 2005 Location: Glasgow Status: Offline Points: 3751 |
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hey
yeah I would prbably guess then aboutv 3k or so into each driver. If they're 1600w drivers then thats probably about right, double the RMS. And 3kw of solid roots or dubstep bass would still be a challenge for any driver. Can we have more details about this driver, is it a solid hardcore horn/small rear chamber driver like a PD1850/V18-1000, a more reflex orentated driver or an inbetweenie thats suitable for ported horns and larger chamber scoops etc? k |
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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Everything you need to know is in the specs & T/S really.. http://celestion.com/product/5/cf18vjd/ Suprisingly, the accurate Xmax is mentioned above, so in PD/Fane terms call it, 12mm. Has strange Vas like 1851/Turbomax so HR & modelling software will not model it properly. Fs/Qes ratio is fairly "horny", but not tight like 1850, so probably won't appreciate tight throat/expansion, or small chamber scoops. Qes of > 0.30 also suggests this. Has good BL, so coupled with lowish Vas, & EBP > 100, suggests plenty of control, even at 800W & above in medium chamber scoop. Overall depth is 233mm, "guestimate" 223mm depth from inside front rim to rear of magnet. So will not fit in most small chamber scoops, unless double front baffle. Usually a good idea to have at least 25mm betwixt driver magnet & rear baffle. E.g, 1850 is approx 175mm deep (not inc rim), ASS RX18 is chamber is approx 190mm deep, Superscooper is 210mm deep. So expect this to like all the cabs a Turbomax 1200 likes, and why the Earthshaker scoop design is as it is. Edited by levyte357 - 12 March 2012 at 4:32pm |
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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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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Lev, can you get one and do you fancy a trip to Manchester to try it in something new that may be interesting? In typical roots fashion I can't fully divulge the details...
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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Sure LIGWA won't lend them out. He may allow you to bring cab to his place and try it in there. |
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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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andycw
Young Croc Joined: 17 November 2010 Location: Norfolk Status: Offline Points: 994 |
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Ligwa, Get a mic please
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No Bass No Fun
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Tocooltom
Young Croc Joined: 07 March 2011 Location: London Status: Offline Points: 1375 |
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I thought the FFA 10k was 5kw rms per channel at 2 ohms? or is this a new amp? |
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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Apparently it's "some amp", Dave FFA has "something to do with". |
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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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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Just looking at the Celestion CF18VJD would explain why the amplifiers need to be bridged in order to achieve a reasonable amount of SPL.
What is most intresting about this driver is the VD hasn't changed in the past 30 years when you compare the CF 18VJD to older top of the line 18-nch drivers from Celestion despite offering more xmax. Celestion was very conservative on their xmax decades ago and, now may have decided to be more upfront based on competition. I do recall Celestion 18-inch drivers had a tendency to distort when driven hard which, may be a good or bad thing pending on the cabinet you put them in. Best Regards, |
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Elliot Thompson
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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Personally don't believe Manufacturers sensitivity figures, so have a dynamic spreadsheet which calculates driver no from few T/S parms, then I re-order sheet to according to most Efficient to least. Edited by levyte357 - 12 March 2012 at 5:52pm |
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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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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Once the no.% states a figure, there is no getting around it. It is one of the oldest figures listed in the TS Parameters yet many still pay no attention to it.
Best Regards, |
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Elliot Thompson
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Herb-i
Registered User Joined: 22 November 2011 Location: Bolton Status: Offline Points: 275 |
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Very heavy stuff Mr Ligwa
Keith |
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