2 ohms woofers is this the future for cabinets |
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bass*en*mass
Old Croc Joined: 03 September 2009 Location: "unknown" Status: Offline Points: 4009 |
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way more linear xmax? |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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6mm more xmax for 3 times the money??? Eerrmmmm, no thanks.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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Imagine phase plug for this
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Ricci
Registered User Joined: 13 March 2017 Location: Louisville, KY Status: Offline Points: 69 |
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The benefits of this type of driver are higher efficiency and longer xmax. In other words more output potential if used well. Combining both attributes in one driver is not easy. It is much easier to make a very efficient driver or a driver with a ton of stroke, but both in the same unit requires significant engineering to balance the tradeoffs and increased material costs. This seems to be the way much of the industry is heading. Companies want more output from less weight and size. It requires driver design to follow suit.
The main limitations in drivers are the thermal limits and the excursion limits. Higher efficiency allows the system to produce the same output level as a lower efficiency cab with less power being dissipated in the voice coil. Heating of the voice coil causes a loss of output or efficiency which is bad. Increasing the linear excursion allows greater output before output compression sets in, distortion gets objectionable, or before something limits in the suspension or motor geometry. Once the voice coil starts to leave the linear region of operation (exceeding xmax) the BL drops, distortion increases dramatically and the driver starts to compress the signal. This in turn causes even more heating in the voice coil as the air movement in the motor and the excursion of the diaphragm are no longer responding in a linear manner to signal increases. This is also bad. Doubling driver displacement (excursion) results in a 6dB increase in output. Doubling the amplifier power results in an increase of only 3dB of output. All systems I've worked with measure and sound their worst when operating near their limits. Most will be compressing the output to some degree. 3dB of thermal compression would not be out of the ordinary when a subwoofer is being run hard over a long period of time. If you can do a driver swap to a more efficient driver with 25% more xmax it is possible that you'll gain back 1 or 2dB, lower distortion and retain better dynamic accuracy. A 2dB gain may not sound like much but it is when how much extra amplifier would be required to achieve it is considered. Sure you could build a bigger sub or multiple cabs to get the output but at some point that is no longer an option.
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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What effectiveness are you talking in matter of horns?
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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In the pro audio world, we look at things differently. Having one 2 ohm nominal woofer is equivalent to having four 8 ohm nominal woofers. From a surface area, excursion, coupling effect in addition to SPL aspect, one could use four 18 inch drivers that will surpass the performance of the single 21 inch driver in question. This speaker may be ideal for a small area where you need to extract every bit of SPL out of a single loudspeaker such as a vehicle or household. However in the Pro Audio world, when you start calculating how much money is going to be invested in acquiring the proper amount drivers to attain the correct coverage in addition to running your amplifiers ragged under a 2 ohm load, it is not worth it. Honestly, if the TS Parameters does not tell you that you will need to rely heavily on equalisation in order to attain significant bass below 150 Hertz, the cost of operating multiples will. Best Regards, Edited by Elliot Thompson - 23 May 2017 at 3:12pm |
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Elliot Thompson
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Bose made a lot of money from that! Sorry, couldn't resist! |
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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Exactly! Bose's methods were strong equalisation and lots of corner loading to achieve bass. Home Audio guys can use corners in their homes to enhance the Bass. Pro Audio guys need to make sure the speaker can deliver it's performance with no additional boundaries other than the ground it resides on. Best Regards, Edited by Elliot Thompson - 24 May 2017 at 11:03am |
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Elliot Thompson
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Ricci
Registered User Joined: 13 March 2017 Location: Louisville, KY Status: Offline Points: 69 |
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Equalization required is entirely dependent on the driver + cabinet system. There is no reason that these would require more than any other driver. It is possible to design cabinets that work with the drivers that would require very little. Also virtually all subwoofers are equalized these days. A simple low pass and high pass are technically equalization. Active (powered) subwoofers are pretty much universally heavily equalized, limited, etc. Anyway that's just my take on why this type of driver is being developed and what the applications for it are. Maximum performance from minimum space. That certainly doesn't make sense for most applications but it does for some.
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Isn't a big part of the IPAL system that you can somewhat tweak the T/S parameters through the integration of te sensors etc to maintain a certain output?
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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The ts parameters clearly say "put me in enormous horn" Neither br nor any another enclosure type will fit. As I understand it amp module from Powersoft allows to tweak ts.
0 latency dsp + pressure sensor could change speaker the same way as .wav and vinyl disc. |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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Yeah it does, that's a key selling point:
http://www.powersoft-audio.com/en/oem-solutions/ipalmod Also 18sound released drivers compatible too last year: http://www.eighteensound.com/Products/Articles/Detail/catid/4050/eid/3322/18id http://www.eighteensound.com/Products/Articles/Detail/catid/4050/eid/3314/21id |
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