Car audio versus HiFi drivers in ELF or Linkwitz subwoofer - diyAudio
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Old 11th August 2008, 12:03 PM   #1
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Question Car audio versus HiFi drivers in ELF or Linkwitz subwoofer

I was wondering how suitable car audio drivers are for use in home HiFi subwoofers, especially in the case of extended low freqency or Linkwitz transform. When I built my sub, I didn't want to risk getting a car audio driver, so I chose the highly recommended Peerless 830847. A friend of mine is designing the same type of sub now, and this time, I'd like to have some more concrete information before we pick a driver.

For example, in WinISD Pro simulations, the JL Audio 13W1v2-4 performs really nice: better excursion figures and almost identical power requirements for the same SPL.

Car audio drivers tend to be available in larger diameters than home subwoofer drivers, which is very convenient for equalized operation such as ELF or LT, but posts such as this one kind of warn against using car audio drivers.

Any (concrete) advice on this matter is appreciated.
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Old 11th August 2008, 01:09 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Things can go wrong in subwoofer design and you cannot "see" it.
For both hi-fi and car audio. Distortion levels cannot be inferred.
Generally hi-fi drivers are better designed, but not always.

Concrete information is hard to come by, and as you surmise
there is no such thing as useful "concrete" generalisations.

/sreten.
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Old 12th August 2008, 04:29 AM   #3
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I am always tooting my horn for the Lab 12 driver for sealed Linkwitz Transform/ELF designs.

I'm about to build a Quad .707Q lab 12 box with 2kW of ICE amp.

It should be capable of 111dB 2KW 1M @ 20Hz

thats with ~4 cu' Vt.

IMO its a tremendous value for the quality of the driver.

I have already built 3 Dual sealed boxes with this driver.

and 4 Ported boxes.

Very high quality construction, very low distortion.
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Old 12th August 2008, 08:10 AM   #4
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I can't seem to find it on Google, not even the manufacturer. Could you point me to the correct location for the Lab website?
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Old 12th August 2008, 08:18 AM   #5
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Hi,

The LAB12 is made by Eminence.

Maybe also look at other pro drivers?
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Old 12th August 2008, 09:35 AM   #6
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WinISD Pro has the Lab 12 in its library and I just compared it to my Peerless 830847. The Lab 12 is much more erratic, even with Qtc=0.707. Even the LT filter doesn't compensate for it. But other than that, it behaves very similarly to my Peerless, in both power requirements as well as excursion.

BTW. What exactly constitutes a "professional" driver? Would this Eminence Lab 12 be (that much) better than my Peerless 830847?
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Old 12th August 2008, 09:47 AM   #7
sreten is offline sreten  United Kingdom
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Hi,

Erratic ?

http://www.klippel.de/pubs/Klippel%2...ymptoms_06.pdf

See Section 7.3 regarding a 12" auto high excursion sub :

"Loudspeaker 3 is an example of a speaker which is optimized for linear Bl(x) and Kms(x)
characteristic by using a long voice coil, a carefully designed magnetic path and a two-spider
suspension. Despite the development effort, final cost and weight of the product the driver
produces a highly distorted output due to the neglected Le(x) and Le(i)-nonlinearities.
Applying some means for shorting the ac-field can improve loudspeaker 3 significantly"

Is the sort of thing you cannot infer from specification or parameters.

FWIW if yopu have the Peerless changing it to the LAB12 or any
of the other similar high performance 12"ers seems pointless.

/sreten.
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Old 12th August 2008, 09:55 AM   #8
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Quote:
Erratic ?
I merely meant that the curve is non-smooth. I'm used to seeing a characteristic bump at the resonance frequency, but this curve goes up and down even below resonance, which is quite unusual (at least, to me).

Thanks for that PDF, I will have a look at it.

Quote:
FWIW if yopu have the Peerless changing it to the LAB12 or any
of the other similar high performance 12"ers seems pointless.
I was not about to replace my driver. That friend of mine and me are just figuring out if he should use the same driver as I do, or another one.
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Old 12th August 2008, 05:40 PM   #9
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'Professional drivers' to me are simply a marketing division that lots generalize about. They are marketed at the people in the pro audio business.

They do come in quite large diameters as well, as you know.

If you like the LAB12, I also suggest you model the Ciare xx.00 SW series.
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Old 12th August 2008, 05:47 PM   #10
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'car' usually means a more harsh environment... humidity / heat / etc.
judge based on parameters like thiele/small
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