Any good for use on low bass ? |
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Posted: 22 February 2021 at 10:51pm |
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Hi - hoping for a bit of input from the guys who can look at T/S params and assess how they'll do a certain job .... ( I broadly understand individual params, but I don't have the knowledge/experience to make a judgement just on the figures). The driver in question is the B&C 15CL76 http://www.bluearan.co.uk/index.php?id=BAC15CL76&browsemode=manufacturer The attraction to me is the weight :-) The context for wanting it is here ... So - I need a driver just for bottom octave really (lets say 40--80) as the FBT Maxx 4 12" box above plays very well down to about 70. I'm not toally sure what 12" driver the Maxx 4 uses - could very well be a 12NDL76 (its definitely a B&C neo driver with a 76mm VC). Here's the B&C T/S params for the 15CL76 :- Parameters
Power handling is hardly an issue - it won't get more than about 200W or so (battery power setup). So my question is .... will the 15CL76 be able to do an adequate job as a "sub" driver ? I get the impression its designed really for 2-way boxes (maybe stage wedges etc.) I'm not sure how much depends on the driver vs. how much depends on the box tuning .... I would put it in a compact reflex box - not aiming to play very low ... 45Hz would be good. Just needed to fill somewhat in below the Maxx 4.
TIA |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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40 Hertz is too generous. This speaker's Sound Pressure Level will be reduced significantly below 60 Hertz.
For a stage monitor, 60 Hertz is fine. The loudspeaker's voice coil cannot generate anything below 60 Hertz with great importance. Best Regards, Edited by Elliot Thompson - 22 February 2021 at 11:29pm |
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Elliot Thompson
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lickweed
Old Croc Joined: 02 May 2009 Location: leyton Status: Offline Points: 2489 |
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fbt maxx4 its 12hpl64 , 2,5" vc
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http://www.liquidsound.co.uk/
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 515 |
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Use 18 for sub................
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Erm - well thanks for replying .... but its not very useful. I have a 18" driver - which I could make a reflex box for - but until medicine has found a way to reverse ageing, found a way to permanently cure my back problems, and I've moved house to somewhere with ground-level storage, it would sit there doing nothing for all eternity. I need a lightweight driver for a ultra-lightweight enclosure. Can be low power handling. The requirements are quite different to most - the context is in the in the other thread I linked. |
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Ah - OK - thanks for correcting that.
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Try exploring RCF Drivers. They tend to offer better options than B&C in 15 - inch drivers capable of delivering 40 Hz.
Best Regards,
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Elliot Thompson
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Edited by JonB67 - 23 February 2021 at 1:33pm |
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Yeah well I thought this might be the case. OTH - I'm not expecting bass with any great authority - just a "taste of bass" ..... so I guess essentially I'm looking for something that can play a fair bit lower than 70Hz - down to about 45Hz or so. Thing is - it also needs to be lightweight - neo motor preferably ... Beyma 15P80Nd looks quite good - but its too expensive, and not particularly light (6Kg). I'm not sure if such a thing really exists. Does a lowish Fs indicate (broadly) suitability for bass ? Eminence Beta15 looks like a possible also - weighs 4Kg. Stated sensivity of 98db - but what about in the 40-80 passband ? Spec says "useable" response down to 45Hz - which would be OK for me. Weedy looking motor and a 2" VC. |
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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15CL76 is will do solid lows down to 40 Hz in a big(-isch) box, say 200 liter or so. Given the moderate power, you won't run into Xmax trouble like that, but 200 liter is hardly compact.
Look for low Vas speakers. Certainly not the only parameter dictating smaller cabs, but it's a start. Low Fs can be an indicator too. Eminence Beta 15 is not the right speaker for you needs, way to high Vas and that would make a +500 liter cab to get the needed response of let's say 40-70 Hz. It would work very well, but VERY big too. Edited by Peter Jan - 23 February 2021 at 1:50pm |
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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If SPL is not a priority, have you considered a low-tuned reflex with a low FS, low powered, rubber surround driver (or multiple)
Eg something like the Beyma 12BR70 will absolutely wobble out that lowest octave, but only at "loud Hifi" levels. It's got a tiny magnet. I bet two of them only weigh as much as that 15.
Personally I've just given up on the idea of bass below 60Hz on my mobile rig, it's just too much effort! |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Eminence will give you lots of options in terms of 15 inch drivers however, the response curve will not be flat due to Eminence preferring a reasonable sized cabinet. You could always add a hefty dose of wadding to tame the over bearing 60 – 80 Hz under the given circumstances.
Honesty, for the power you have to drive the loudspeaker, the cabinet size restraints in addition to, the 45 Hertz objective, I would explore 12 inch options from Eminence. Possibly the Beta 12. You should get 50 Hertz out of a 90 Litre box. A +6dB boost @ 50 Hz should get – 3 dB @ 40 Hz. It is a 250 watt RMS loudspeaker which, will be a lot easier to drive on a 200 watt amplifier than, a modern-day 15 inch driver that needs 3 times the power just to move. You can always contact Eminence and tell them your requirements and, they will find the best driver for your needs if you must have a 15 inch driver.
Best Regards,
Edited by Elliot Thompson - 23 February 2021 at 2:30pm |
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Elliot Thompson
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