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Author Topic: Can you find better.  (Read 12030 times)

Antone Atmarama Bajor

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Re: Can you find better.
« Reply #20 on: January 13, 2007, 09:00:29 pm »

    MJ-18

I don't see anything similar under TC sounds.

    Bass Box pro doesn't exactly jive with the TS parameters provided but It modeled decently.  Good down to 30Hz.  A pair of them would be some competition for the 4 lab 12's as far as output and spl.

    Still not great bellow 30Hz, but the first less expensive contender I've seen that has decent performance.  At a little less than half the price I may have to prototype a pair of these.  It would be a little less volume than 4 of the Lab 12's.

   I wonder about the quality of the basket.  It has to be stamped steel and is the power handling RMS??? or Peak??  Another consideration.

     I'd say the MJ-18 is certainly a great value, I would like to know more about the quality of manufacture.

Antone-
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Nathan Lehouillier

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Re: Can you find better.
« Reply #21 on: January 13, 2007, 10:43:21 pm »

Hi Antone,


I was looking at the 21w1400 18 sound driver.
I think the box would be bigger but it looks
to have the output capability to surpass equal
#'s per $.


Nate KDS&L
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Les Webb

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Re: Can you find better.
« Reply #22 on: January 14, 2007, 12:31:53 am »

Peter Wing wrote on Sun, 14 January 2007 01:31

Here is a driver that you could get great cost effectivness from..
This driver has been widely accepted as a great quality item by the DIY audio community.. despite the insane price.

 http://www.mach5audio.com/product_info.php?cPath=48&prod ucts_id=38&osCsid=e8481273ddba91880943fd3473852bc0




That is a very nice looking driver.  I wonder what shipping to the US is like?  Models well in WinISD for my applications.
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Antone Atmarama Bajor

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Re: Can you find better.
« Reply #23 on: January 14, 2007, 03:13:23 pm »

      The 18sound is only higher output above 30Hz.

     You could try and make a larger than optimal Box to to a shelved extended bass response BUT!  You run out of Xmax way before the LAB12 driver.  The 4 Lab 12 drivers start to run out of xmax around 1600Watts.  So their usable power bandwidth is ~ the same as their RMS power handling.

    If you are looking above 30Hz its great and fine.  I'm interested in a comparable Sub Bass Driver.

Antone-
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Tim Duffin

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Re: Can you find better.
« Reply #24 on: January 14, 2007, 06:13:47 pm »

you can get them for about 150 each all day, a little hunting could get them to you for 129 or so.  I think that the power handling is very conservative on the JL, by looking at its construction you could see that it has the capability of 2"+ mechanical xmax.

anywhoo-- thanks, I always wondered what they would model against a good pro audio driver.


T

Antone Atmarama Bajor

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Re: Can you find better.
« Reply #25 on: January 14, 2007, 07:03:38 pm »

     I'm not sure why xmech is even a spec other than to say, this is where you will cause physical damage to the driver.  The Lab 12 driver has a .8" (22mm) Xmech or ~1.6" Xmech Peak to peak. But is rated at 13mm Xmax.  I think once you exceed Xmax you are no longer effectively in the magnetic gap, or in a range where the magnetic field is not as stable, and the suspension is not as compliant.

    That is not a range you want the driver to operate in as it is where the driver either bottoms out or tears the spider or surround.

    I guess the best thing about having a Large Xmech is that the driver can survive certain types of abuse a little better before breaking.  I don't think it allows the driver to be able to displace more air.  At least not in desirable relation to the input signal.

    150$ is certainly reasonable.  There is one other driver that I've seen on a DIY sub site that has a error correction coil in the driver for servo correction.  That has similar specs to JL and Lab 12.  I didn't catch the price of the driver though.

JL audio and Mach 5 are the two contenders for the Best Value subwoofer motors award so far.

Antone-





   
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Mark Seaton

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Re: Can you find better.
« Reply #26 on: January 14, 2007, 07:35:40 pm »

Hey Antone,

Just a little pointer...  Check out both TC's dB-500 and CSS's SD12.  Both drivers are actually reasonably close to the parameters for the LAB12 but are likely all too deep to fit in the LABhorn.  They also both have considerably more linear travel and should work very well in mid-size ported boxes you have been comparing.  The different drivers do have their benefits, but the added motor travel should be welcome in a non-horn loaded box, and actually help a good bit when used in a horn.

Happy modeling...
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John Schmidt

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Re: Can you find better.
« Reply #27 on: January 17, 2007, 11:03:52 am »

I haven't seen the T/S parameters yet, but have you looked into the JBL 2269 18" driver with 3.5" peak to peak? It's used in the VT4880A and VT4881ADP subwoofers.

Edit: Ouch!! I just checked the price - $2250 for the raw driver! Makes the 2268H look like a steal at $465...

John
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Antone Atmarama Bajor

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Re: Can you find better.
« Reply #28 on: January 17, 2007, 08:38:57 pm »

     Thanks for those drivers.

   Both of them look like excellent subwoofers.  At a very competitive price.  I'm wondering about the ruggedness of the stamped basket that TC sounds is using.  Does it ping badly?

   Watt per watt the Lab12 models better than the other 2 by a few DB until about 20Hz for the TC sounds.  But the lab 12 also runs close to xmax at rated power and reaches higher excursion than the other two drivers.

    The TC and the CSS seem to need longer larger ports (2X the length of the LAB's)  This models to significantly reduce vent velocity.  It ends up that similar Vt required for all drivers.

     I never thought to hard about the difficulty's in finding a driver that would meet required parameters, to work properly in the lab horn, and would actually fit within its size constraints.

    I guess the fact that the Driver for the BT7 has no protruding motor structure is the reason why such a slim cabinet was achievable.

    The Sonicraft NRT 12 also looked interesting but a little more expensive, for a little less Power handling, a little less output, but more extension out to 16Hz.

    An Adire tumult 18 looks like fun.

Thanks again!!!

Antone-  
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sheldon harris

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Re: Can you find better.
« Reply #29 on: January 20, 2007, 06:08:24 pm »

Antone Atmarama Bajor wrote on Fri, 29 December 2006 09:12

     
    I guess I will expand the criteria to can anyone find a single 18 that can get the same performance as 4 Lab 12 drivers in the same price range (As they are about the same SD and VAS).

    I dare you, tripple dog dare you to even.

Thanks for specing this kick ass driver Tom!!!

Antone-

   


the criteria is very hard to beat. especially for 4 lab12 drivers.

there is no way that a single 18" driver can have the same sd as 4 lab12s! example. typical 18" sd is about 180 square inch. typical 12" sd is about 78 square"  lab12 is about 79 or so
x 4 = 316 square inch total for 4 labs. vs. at best 180 sd for a single 18" thats an unfair advantage in favour of the labs.
unless i am understanding your post incorrectly.
my contender is the evx 1800   http://archives.telex.com/archives/EV/Speakers/EDS/EVX-1800% 20EDS.pdf
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