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6515


Date: January 24, 2000 at 20:58:52
From: jeremy, [flntb210-07.splitrock.net]
Subject: servo motor driven subwoofers


I'm looking for info, and websites on servo driven subwoofers. please help


Responses:
[6540] [6561] [6517] [6528] [6555] [6562] [6600] [7593] [7614] [7594]


6540


Date: January 26, 2000 at 17:03:07
From: Robert, [nproxy.attws.com]
Subject: Re: servo motor driven subwoofers


Jeremy,

The ContraBass is by far the most known about servo driven sub out there, and this is why it is SOOOO expensive. It was reviewed in a past issue of Widescreen Review.
The most powerful servo drive subs out there can be had for MUCH less, but you have to look at the Pro-Audio market for these. They are used in theme parks and rock concerts. The most popualr is from a company called Acoustic (a division of Samick Music Corp.).
It is the SBT 2.6. It is HUGE consuming 25 cubic feet and tipping the scales at 153lbs! It has a single 26" driver!!!! You need nearly 1200W to push it to its' max of 139 dB! 1200W may SEEM like a lot of power, but power is cheap these days! My Mackie 1400i (1400W max into a single 4ohm load) was $490 from the same place that carries the SBT 2.6 .
This foundation cracker lists for around $2100-2500, but you could probably snag one for around $1500 or maybe less.
This T-rex sized driver is capable of 3.5" of excursion!


Responses:
[6561]


6561


Date: January 27, 2000 at 13:42:07
From: jeremy, [flntb509-39.splitrock.net]
Subject: Re: servo motor driven subwoofers


any pics, specs, websites, phone#s, ect. for acoustic and/or servo affiliated subwoofer companys I have spent hours looking and have come up empty other than servodrive and contrabass corner. thanks


Responses:
None


6517


Date: January 25, 2000 at 00:03:53
From: cabletow, [pool0674.cvx23-bradley.dialup.earthlink.net]
Subject: Re: servo motor driven subwoofers


take a look at www.servodrive.com or The Contrabass Corner. the contrabass corner has a lot of pictures/specs of servo driven speakers.


Responses:
[6528] [6555] [6562] [6600] [7593] [7614] [7594]


6528


Date: January 25, 2000 at 15:05:10
From: jeremy, [flntb211-07.splitrock.net]
Subject: Re: servo motor driven subwoofers


wow!!! they sure are expensive. is their a company who makes something similar for less money? are the servodrive subs worth the money. how do the servodriven subs compare to standared magnet/voicecoil? thanks


Responses:
[6555] [6562] [6600] [7593] [7614] [7594]


6555


Date: January 27, 2000 at 03:39:22
From: cabletow, [pool0915.cvx23-bradley.dialup.earthlink.net]
Subject: Re: servo motor driven subwoofers


I've heard that when using Servo Drive systems it's either all or nothing. You have to use a lot of power to make them sound good because don't sound very good at low or medium levels. A friend of mines knew someone who used them for raves and stated that peoble literaly could not stand next to the speaker boxes. I once saw a program on the Discovery channel where they were testing how houses would react during an earthquake. They placed about 6-8 of these boxes right outside (next to the house's wall)Man, you should have seen how much the walls of that house moved. It was great! As you can tell I would love to have just one pair of the speakers! No I don't know of another company that makes a simular system. Yes, I agree that the price is extremely high. I you find another anymore info please let me know. cabletow@earthlink.net.


Responses:
[6562] [6600] [7593] [7614] [7594]


6562


Date: January 27, 2000 at 13:51:55
From: jeremy, [flntb509-39.splitrock.net]
Subject: Re: servo motor driven subwoofers


now thats bass. sounds like one would be plenty for most sub applications two is far to expensive. trying to find out more on acoustic sbt2.6 by samic music corp. my use for the sub is <50Hz I need the impact for HT thanks


Responses:
[6600] [7593] [7614] [7594]


6600


Date: January 30, 2000 at 15:18:09
From: Robert, [nproxy.attws.com]
Subject: Re: servo motor driven subwoofers


Jeremy,
If you really think that you need a device capable of simulating an earthquake (they are used in the theme parks in Orlando FL), then try your local music shop (any place that sells guitars or drums or professional monitors). If they don't carry the SBT 2.6, they should be able to order it. Just make sure you have enough realestate for it, it measures 29.38"x30"x48.5" (HxWxD).
It is flat to 20Hz on a stage!!!!!!!!!!!!
Placed in a SOLID corner in a room it should play into the single digits!!!!


Responses:
[7593] [7614] [7594]


7593


Date: April 24, 2000 at 00:16:18
From: John Halliburton, [blue4pool128.mcleod.interaccess.com]
Subject: Re: servo motor driven subwoofers


Hello,
Some comments on products or projects mentioned in this thread:
There is some friction involved when initially powering up a Servodrive product,
typically below one watt. After that, they
are on the order of a decade less distortion
than a regular voice coil loudspeaker.
There are two models currently, the horn loaded Basstech 7, and the direct radiator
Contrabass. The Contrabass is a passive radiator(same as a vented system) ultra low
frequency subwoofer. This is a slightly scaled down version of the "elephant sub"
originally done for Cornell University in
their National Geographic funded research in
africa. Response is -3db at 16hz, and it is
cabpable of 114db with 200watts input AT 16hz. The Basstech 7 is horn loaded, power cooled with air drawn from the outside through a filter, and capable of output around 134db down to 30hz. This changes with the number of units as the effective mouth size of the horn increases to a more
optimum dimension. The largest change is when going from one to two units. The cabinet size was chosen to be compatible with truck pack dimensioning.
The Sonic Boom simulation project was a special design for Georgia Tech, and used
everything from a 2" compression driver/horn, 15" drivers, Basstech 7 subs,
and two special horn loaded devices to take
it down to 3hz. Now, 3hz isn't even audible until it is higher than 120db. What Tom Danley wound up using was a high velocity fan, driven by 5hp motors in a cabinet app.
60"x60"x24". The air traveled in a loop, and
there was a large valve mounted in a cylinder that controled the waveform reproduction. Attached to this box were a pair of horn flares about 6'x6', and 6' long. Amazing.
As for theme parks, equipment sold to them have been standard units such as the Basstechs, Contrabasses, and earlier versions. There is also a special order
"Subterranean sub" that is basically two
direct radiating pairs of drivers with a single pair of passives in a fiberglass container. Part of this unit is buried to
be more unobtrusive.
For anyone interested, a full range line of
loudspeakers is available, with the new trapezoid shaped, fully flight rigged box
debuting at NSCA in Las Vegas next weekend.

Best Regards,
John Halliburton
Servodrive, Inc.


Responses:
[7614] [7594]


7614


Date: April 25, 2000 at 17:21:08
From: Robert S., [hoproxy1.proxy.lucent.com]
Subject: Re: SERVODRIVE FOR THE AVERAGE JOE


The ContraBass is by far the most known about servo driven sub out there, and this is why it is SOOOO expensive. It was reviewed in a past issue of Widescreen Review.

The most powerful servo drive subs out there can be had for MUCH less, but you have to look at the Pro-Audio market for these. They are used in theme parks and rock
concerts. The most popualar is from a company called Acoustic (a division of Samick Music Corp.).
It is the SBT 2.6. It is HUGE consuming 25 cubic feet and tipping the scales at 153lbs! It has a single 26" driver!!!! You need nearly 1200W to push it to its' max of 139
dB! 1200W may SEEM like a lot of power, but power is cheap these days! My Mackie 1400i (1400W max into a single 4ohm load) was $490 from the same place that
carries the SBT 2.6 .
This foundation cracker lists for around $2100-2500, but you could probably snag one for around $1500 or maybe less.
This T-rex sized driver is capable of 3.5" of excursion!


Responses:
None


7594


Date: April 24, 2000 at 00:23:23
From: j inlow, [ip90.portland3.or.pub-ip.psi.net]
Subject: Re: servo motor driven subwoofers


cool!!


Responses:
None


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