| Author |
Message |
Mark & Mary Ann Weiss
Guest
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 Posted:
Fri Nov 11, 2005 5:43 am Post subject:
Re: 6000 watt woofer! ;) |
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| Quote: | The "tuning frequency" is 32 Hz, so its -3 dB point in the
speced enclosures might be just below that, maybe 28 Hz.
It's probably not exactly a speaker for reproducing
earthquakes.
The implied efficiency is not high - might be less than 90
dB/W. That means that its 6 KW power rating relates to the
same acoustic output as a more typical 98 dB/W speaker being
driven by about 800 watts.
|
True, but considering that MTX claims a linear peak to peak excursion of 5",
that would move a LOT of air, and volume displacement equates to SPL, which
I would imagine would be very high, if in fact the cone CAN move that far.
--
Best Regards,
Mark A. Weiss, P.E.
www.mwcomms.com
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Pooh Bear
Guest
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| Posted:
Fri Nov 11, 2005 5:43 am Post subject:
Re: 6000 watt woofer! ;) |
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Mark & Mary Ann Weiss wrote:
| Quote: | "BOB URZ" <"sound(remove)"@inetnebr.com> wrote in message
news:4373842C.AAA249DE@inetnebr.com...
For those with a overload of testosterone, here you go:
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm
22" woofer. 6.5" voice coil. 900 oz magnet. 6000 w RMS.
Bob
Now that looks like a pretty respectable subwoofer. An Xmax of 2.5". Not
bad! But they have little available in the way of specs, such as sensitivity
@1W. Even if it's only 91dB, that's close to 140dB at full power. That's the
kind of thing I would design if I had the manufacture capability. Price is a
bit extreme, but if you're going for no-compromise, I suppose this is the
current champ.
|
Where did you find the Xmax ? I looked but didn't see it.
I'm afraid you're mistaken about your SPL calc btw. It would come to ~ 130dB. (
which is what the PD drivers can do )
Graham |
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Mark & Mary Ann Weiss
Guest
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| Posted:
Fri Nov 11, 2005 5:43 am Post subject:
Re: 6000 watt woofer! ;) |
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2.5" for the JackHammer.
Precsion Devices displacment limit (not Xmax, which is a fraction of Xlim)
is 1.42".
I recently had a choice between the Precision Devices woofers and the newest
offering from E-V, the EVX180B and I went with the latter because of a
longer excursion capability of the 180B, about 2". In practice, they have
12dB more output than the Altec 3182s they replaced. One cabinet with a pair
of them produces as much bass as six conventional 18" woofers of high
efficiency. Positively deadly speakers, especially when you have ten of them
all going at once!
--
Best Regards,
Mark A. Weiss, P.E.
www.mwcomms.com
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Pooh Bear
Guest
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| Posted:
Fri Nov 11, 2005 5:43 am Post subject:
Re: 6000 watt woofer! ;) |
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BOB URZ wrote:
I expect this will seriously outperform it for SR.
http://www.precisiondevices.co.uk/ShowDetails.asp?id=17
It would be interesting to know what Xmax ( cone displaceemnt ) is for that jack hammer
speaker though.
Graham |
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TimPerry
Guest
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| Posted:
Fri Nov 11, 2005 5:43 am Post subject:
Re: 6000 watt woofer! ;) |
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"Pooh Bear" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:437417AB.5EE0B9D1@hotmail.com...
| Quote: |
TimPerry wrote:
"Rob Beech" <Mail@robbeech.com> wrote in message
news:S8Scf.7483$mF5.5604@newsfe4-gui.ntli.net...
"Pooh Bear" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:4373DE64.F2E7631C@hotmail.com...
BOB URZ wrote:
For those with a overload of testosterone, here you go:
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm
22" woofer. 6.5" voice coil. 900 oz magnet. 6000 w RMS.
I expect this will seriously outperform it for SR.
http://www.precisiondevices.co.uk/ShowDetails.asp?id=17
It would be interesting to know what Xmax ( cone displaceemnt ) is
for
that jack hammer
speaker though.
Graham
as will the 21...and 18.... probably most of them in the right
enclosure.
:P
Rob
assume a bass beat which creates a steady demand for 6000W RMS, zero
conversion losses, a 100 AH 12V battery running at 13.8 V under charge
by a
100 A alternator.
assume no other load on the electrical system.
how many minutes before the engine dies, the battery explodes, and/or
the
alternator burns up?
i make it about 15
Funny you should say that.
There's this guy I know with ( fwiw ) a Corvette. It has a fairly stonking
audio sytem as standard. He recently told me that it flattened his battery
even
though this was on a long motorway drive !
Graham
|
an interesting article about alternators
http://members.1stconnect.com/anozira/SiteTops/energy/Alternator/alternator.htm |
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Ron(UK)
Guest
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| Posted:
Fri Nov 11, 2005 10:04 am Post subject:
Re: 6000 watt woofer! ;) |
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shannon wrote:
| Quote: | On Thu, 10 Nov 2005 13:40:38 -0600, BOB URZ wrote:
Rupert wrote:
BOB URZ wrote:
For those with a overload of testosterone, here you go:
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm
22" woofer. 6.5" voice coil. 900 oz magnet. 6000 w RMS.
Bob
I've seen that one before. Some things to note about the specs are: no
efficiency or maximum output specs are given so I suspect it's
extremely inefficient, no tolerance is given with the frequency
response listed, so I suspect it's not very flat at any power level. I
willing to bet with 6000 watts of input that it's output might not be
as impressive as one might think. However, I wouldn't mind seeing one in action just to
check it out ;-)
Greg
Yea, like seeing Pamela Anderson. You just want to check out
the spectacle. She's got a pair of drivers on her......
Bob
They are not woofers though, they are the upper mid devices known as
hooters.
|
Give them a few years and they`ll be the lower mid devices known as
droopers. unless she has them reconed to stiffen up the suspension.
Ron
--
Lune Valley Audio
Public address system
Hire, Sales, Repairs
www.lunevalleyaudio.com |
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Tim S Kemp
Guest
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| Posted:
Fri Nov 11, 2005 1:56 pm Post subject:
Re: 6000 watt woofer! ;) |
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Pooh Bear wrote:
It would, problem is that to get big power in an in-car install you need low
impedance, although I dare say PD would wind you a 2 or 1 ohm version if you
asked nicely and paid enough.
It lives in here normally though IIRC
http://www.turbosound.com/showroom/tsw124/index.html
--
Just remember that you're standing on a planet that's evolving / And
revolving at 900 miles an hour / That's orbiting at 19 miles a second,
so it's reckoned, / A sun that is the source of all our power. / The
sun and you and me and all the stars that we can see, / Are moving at a
million miles a day / In an outer spiral arm, at 40,000 miles an hour,
/ Of the galaxy we call the Milky Way. |
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Marc Amsterdam
Guest
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| Posted:
Fri Nov 11, 2005 3:25 pm Post subject:
Re: 6000 watt woofer! ;) |
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On Fri, 11 Nov 2005 04:01:47 +0000, Pooh Bear
<rabbitsfriendsandrelations@hotmail.com> wrote:
| Quote: | i make it about 15
Funny you should say that.
There's this guy I know with ( fwiw ) a Corvette. It has a fairly stonking
audio sytem as standard. He recently told me that it flattened his battery even
though this was on a long motorway drive !
I suppose it flattened more than just his battery, what about his |
brain pulse?
there are some car audio freaks on one of my clients SRc side that use
capacitors op to 4 F ( no not pF, F) then they use pro- amps like
DA800 ( thoroughly modded) and Pa speakers tuned into their sorry Pug
306's and VW Golfs to win just about every dB contest there is...
i've seen graph's exceeding 157dB spl ....
They often wonder why their cars are so hideously slow :-)
Marc |
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Arny Krueger
Guest
|
| Posted:
Fri Nov 11, 2005 7:47 pm Post subject:
Re: 6000 watt woofer! ;) |
|
|
"Mark & Mary Ann Weiss" <mweissX294@earthlink.net> wrote in
message news:i6Vcf.6624$GT3.6045@fe02.lga
| Quote: | The "tuning frequency" is 32 Hz, so its -3 dB point in
the speced enclosures might be just below that, maybe 28
Hz. It's probably not exactly a speaker for reproducing
earthquakes.
The implied efficiency is not high - might be less than
90 dB/W. That means that its 6 KW power rating relates
to the same acoustic output as a more typical 98 dB/W
speaker being driven by about 800 watts.
True, but considering that MTX claims a linear peak to
peak excursion of 5", that would move a LOT of air, and
volume displacement equates to SPL, which I would imagine
would be very high, if in fact the cone CAN move that
far.
|
A 22" diaphragm moving 5 inches can move a lot of air, so
say the least!
Car audio speaker driver manufacturers have been pushing the
envelope, pressing for larger and larger displacement
drivers. Given that many of these drivers are probably
destined for dates with my good friend Dave Clark's Dumax
machine, and potentially adverse publicity in popular car
audio consumer publications at the hands of my other good
friend Tom Nousaine (these two guys talk to each other!),
there's very little incentive for anybody to lie. The truth
will out.
IOW I suspect thatt he 5" linear travel spec is not made out
of whole cloth. ;-)
Other than extremely portable applications, there's also
very little incentive for such relatively low efficiency in
a driver designed for live sound applications. For example
subwoofer boxes in the 8-16 cubic foot range are impractical
for car audio, but managable for live sound. I believe that
doubling the size of the box more than doubles the
efficiency, all other things being equal. However,
exploiting the larger box this way generally points at a
driver with among other things, reduced cone mass.
IOW the same basic chassis might be reconfigured into an
exceptional live sound sub-bass driver. There's a good
chance that the components of this driver are actually
manufactured by a third party, perhaps even in the PRC, if
you catch my drift. |
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Arny Krueger
Guest
|
| Posted:
Fri Nov 11, 2005 7:59 pm Post subject:
Re: 6000 watt woofer! ;) |
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|
"TimPerry" <timperry@noaspamadelphia.net> wrote in message
news:TJSdnbVOv5dUj-neRVn-rA@adelphia.com
| Quote: | "Rob Beech" <Mail@robbeech.com> wrote in message
news:S8Scf.7483$mF5.5604@newsfe4-gui.ntli.net...
"Pooh Bear" <rabbitsfriendsandrelations@hotmail.com
wrote in message news:4373DE64.F2E7631C@hotmail.com...
BOB URZ wrote:
For those with a overload of testosterone, here you go:
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm
22" woofer. 6.5" voice coil. 900 oz magnet. 6000 w RMS.
I expect this will seriously outperform it for SR.
http://www.precisiondevices.co.uk/ShowDetails.asp?id=17
It would be interesting to know what Xmax ( cone
displaceemnt ) is for that jack hammer
speaker though.
Graham
as will the 21...and 18.... probably most of them in the
right enclosure. P
Rob
assume a bass beat which creates a steady demand for
6000W RMS, zero conversion losses, a 100 AH 12V battery
running at 13.8 V under charge by a 100 A alternator.
assume no other load on the electrical system.
how many minutes before the engine dies, the battery
explodes, and/or the alternator burns up?
i make it about 15
|
Woofers like this are generally only driven with high
continuous power in competition. Most competions of this
kind allow the use of external power sources.
As you no doubt know, the average power content of unclipped
music is generally pretty low - as much as 10:1 or more
lower than the peaks. |
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Arny Krueger
Guest
|
| Posted:
Fri Nov 11, 2005 8:18 pm Post subject:
Re: 6000 watt woofer! ;) |
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|
"Mark & Mary Ann Weiss" <mweissX294@earthlink.net> wrote in
message news:hfVcf.6651$GT3.2063@fe02.lga
| Quote: | For those with a overload of testosterone, here you go:
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm
22" woofer. 6.5" voice coil. 900 oz magnet. 6000 w RMS.
I expect this will seriously outperform it for SR.
http://www.precisiondevices.co.uk/ShowDetails.asp?id=17
It would be interesting to know what Xmax ( cone
displaceemnt ) is for that jack hammer speaker though.
Graham
2.5" for the JackHammer.
Precsion Devices displacment limit (not Xmax, which is a
fraction of Xlim) is 1.42".
I recently had a choice between the Precision Devices
woofers and the newest offering from E-V, the EVX180B and
I went with the latter because of a longer excursion
capability of the 180B, about 2". In practice, they have
12dB more output than the Altec 3182s they replaced. One
cabinet with a pair of them produces as much bass as six
conventional 18" woofers of high efficiency. Positively
deadly speakers, especially when you have ten of them all
going at once!
|
If one does the math, 10 EVX180's out-displace the MTX
jackhammer by quite a bit, are about 10 times as efficient,
and cost about 1/3 as much. The downside for car audio
purposes would be the size of the box. |
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Chad Wahls
Guest
|
| Posted:
Fri Nov 11, 2005 9:19 pm Post subject:
Re: 6000 watt woofer! ;) |
|
|
"Mark & Mary Ann Weiss" <mweissX294@earthlink.net> wrote in message
news:hfVcf.6651$GT3.2063@fe02.lga...
| Quote: |
For those with a overload of testosterone, here you go:
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm
22" woofer. 6.5" voice coil. 900 oz magnet. 6000 w RMS.
I expect this will seriously outperform it for SR.
http://www.precisiondevices.co.uk/ShowDetails.asp?id=17
It would be interesting to know what Xmax ( cone displaceemnt ) is for
that jack hammer
speaker though.
Graham
2.5" for the JackHammer.
Precsion Devices displacment limit (not Xmax, which is a fraction of Xlim)
is 1.42".
I recently had a choice between the Precision Devices woofers and the
newest
offering from E-V, the EVX180B and I went with the latter because of a
longer excursion capability of the 180B, about 2". In practice, they have
12dB more output than the Altec 3182s they replaced. One cabinet with a
pair
of them produces as much bass as six conventional 18" woofers of high
efficiency. Positively deadly speakers, especially when you have ten of
them
all going at once!
Although an impressive driver (I use one in my studio rig) it is far from |
brand new and has had it's ass handed to it buy many different, more modern
drivers. I have never found a PAIR of drivers produce as much as SIX, it's
a cone driver not a servodrive unit :) If this were true this would mean
that ONE X-array Xds would pummel 3 SB180's.... That just does not happen
:)Please take note of the aurasound and mccauley drivers used in such
designs of the bassmaxx and others, these are great woofers, albeit pricey.
Again I'm not dissing the EVX180B but it's time for EV to jeep up in
retrospect to JBL, Mccauley, Aura, and even Peavey with the Lowrider 18.
Chad |
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Peter Larsen
Guest
|
| Posted:
Sat Nov 12, 2005 12:00 am Post subject:
Re: 6000 watt woofer! ;) |
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Pooh Bear wrote:
Qts 0.33 == this is a unit intended for bass reflex loading according
to something Steen Duelund once told me, also obvious from the large
displacement limit, not really for horn loading but usable. A version
intended for horn loading should have a lower Qts, below 0.3, and a
smaller displacement limit so as to keep more coil in the gap at all
times.
Kind regards
Peter Larsen
--
*******************************************
* My site is at: http://www.muyiovatki.dk *
******************************************* |
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TimPerry
Guest
|
| Posted:
Sat Nov 12, 2005 4:56 am Post subject:
Re: 6000 watt woofer! ;) |
|
|
"Arny Krueger" <arnyk@hotpop.com> wrote in message
news:ZYWdnU2Sq-QwPunenZ2dnUVZ_v2dnZ2d@comcast.com...
| Quote: | "TimPerry" <timperry@noaspamadelphia.net> wrote in message
news:TJSdnbVOv5dUj-neRVn-rA@adelphia.com
"Rob Beech" <Mail@robbeech.com> wrote in message
news:S8Scf.7483$mF5.5604@newsfe4-gui.ntli.net...
"Pooh Bear" <rabbitsfriendsandrelations@hotmail.com
wrote in message news:4373DE64.F2E7631C@hotmail.com...
BOB URZ wrote:
For those with a overload of testosterone, here you go:
http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm
22" woofer. 6.5" voice coil. 900 oz magnet. 6000 w RMS.
I expect this will seriously outperform it for SR.
http://www.precisiondevices.co.uk/ShowDetails.asp?id=17
It would be interesting to know what Xmax ( cone
displaceemnt ) is for that jack hammer
speaker though.
Graham
as will the 21...and 18.... probably most of them in the
right enclosure. P
Rob
assume a bass beat which creates a steady demand for
6000W RMS, zero conversion losses, a 100 AH 12V battery
running at 13.8 V under charge by a 100 A alternator.
assume no other load on the electrical system.
how many minutes before the engine dies, the battery
explodes, and/or the alternator burns up?
i make it about 15
Woofers like this are generally only driven with high
continuous power in competition. Most competions of this
kind allow the use of external power sources.
|
reminds me of the joke about the electric car with a long extention cord.
| Quote: |
As you no doubt know, the average power content of unclipped
music is generally pretty low - as much as 10:1 or more
lower than the peaks.
|
has anyone invented a buttkicker for autos yet? |
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mcsteve
Guest
|
| Posted:
Sat Nov 12, 2005 5:36 am Post subject:
Re: 6000 watt woofer! ;) |
|
|
"TimPerry" wrote:
| Quote: | has anyone invented a buttkicker for autos yet?
|
A quick browse of http://www.partsexpress.com yielded
this:
http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=3
Seems like any mechanically coupled transducer would work, as long
as it can be directly connected to a power amp. (No AC required, etc)
---------------------------------------------
'''''''''''''''''''''''''''''''''''''''''''''''''''''
Steve M
(remove "x" from email addy, to contact directly) |
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