Perhaps you folks have already seen this, but anyway …
http://www.sonicflare.com/archives/eminent-tech-trw-17-the-most-powerful-subwoofer-in-the-world.php
Reports a flat response down to 1Hz. Interesting concept.
Replies (8)
pigwiggle on 11/3/2005 14:48:57
Try this site instead:
http://www.eminent-tech.com/main.html
Specifications:
Amplifier Requirement 200 watts @ 8 ohms
impedance 8 ohms 0Hz - 40Hz
Frequency response 1Hz – 30Hz +/- 4dB
suggested crossover 30Hz @ 18dB/octave
Sensitivity 90dB 1 watt 1 meter @10Hz
Maximum acoustic output >110dB between 1 and 30Hz.
Distortion typically 3% or less between 1 and 30Hz @90dB
Warranty – 3 years parts and labor
Price $12,900 each, not including amplifier or crossover
Victor on 11/3/2005 15:44:54
hmmm... interesting concept,
must be effective at lower frequencies.. but what about the transient response, ?????? with the fast bass beats in this modern day music, how are you going to control a rotating fan at high speeds to produce simultaneous wave forms of different frequencies at such a fast speed...
well i really cant comment much on this until i actually see it perform. but anyways its gonna take ages before its into the market and i highly doubt someone spend $13000 and more for a 200wrms subwoofer..
Technically on a sceintific front it may be a very good achievement but its way too far before it can be commercialsed and becomes a success in the market.
Victor..
pigwiggle on 11/3/2005 16:17:34
“how are you going to control a rotating fan at high speeds to produce simultaneous wave forms of different frequencies at such a fast speed...”
The fan blades rapidly change pitch while the RPM of the rotor remains constant. The article gave the impression that the pitch of the blade was changed by a conventional voice coil and was as responsive as a conventional speaker. I guess changing the RPMs would control the volume.
Victor on 11/3/2005 16:44:46
""""A motor controller and electric motor rotate a set of blades at a constant speed. The rotary woofer pitch mechanism uses a conventional voice coil and magnet assembly. This is connected to your amplifier to pitch blades in proportion to the applied audio signal. As the blades pitch while rotating a pressure wave is generated, the degree of pitch controls the amplitude of the pressure wave. Air is allowed to transition through the blades. Thus oscillating the pitch of the blades creates sound while they are rotating .""""
P0werLifter on 11/3/2005 16:54:07
While it may be a very interesting design, still looks like a $13000 fan from the 1960s to me.
Victor on 11/3/2005 16:59:45
its a nice concept .. but just not worth the price... i cud sacrifice few sub-sonics for such kind of money..hehehehe
also... its more easier to move a lighweight cone than a metal rotor blade. and i feel that the transients on a conventional woofer will be anyday better than a Fan..
Also, this sub is optimised for performance upto 30Hz , only some of the best mids available can do as low as 40Hz at decent volumes.. so filling up that gap in a system will be harder, and those subsonics are no ways going to be heard, cause they are completely out of human perception of sound, it can only be felt, more sub-sonincs in a car means more vibration and less sound heard ... mean more rattling and using more and better sound damping material and in all will be a great expense..
so as of now, with my limited understanding of this FAN, i really think that for use in automobiles this is just a $ 13000 fan creating more problems then actually helping...
Victor...
swez on 11/4/2005 08:14:35
This audio toy will never make it out of the hanger at $13,000 a pop. I have bought brand new cars for less.
Interesting concept here. It seem to operate much like the propellers on a prop driven plane. By changing the pitch of the blades, the frequency response changes as well. OK, not a new idea... just a new application.
As for frequency and transient response, who cares? This design has limited frequency response. Mostly in the sub-sonic range. Fine in a theater environ, where we want to feel the rumble of a volcano or the launch of a space shuttle, etc. Other than that, I don't see much value for the price tag noted.
Test tones are one thing to reproduce. However, complex subwoofer tones have a lot of transients and harmonics as well. (like a large Church organ or perhaps a synthesizer's tone generators) But, how many listen to that all the time?
Put it to the test with a Leap plotter and complex bass tones that one can hear. Once the numbers are published, the price likely till drop to under $500.00 or become a novelty at most any audio trade show.
Interesting idea yes, practicallity for the average HT buff is suspect. Only the guy who has money to burn and wants the latest gizzmo, would even consider this one. (In My Not So Humble Opinion)
Swez
ttocs on 11/4/2005 13:11:44
reminds me of the PG cyclone. It was neat, and could sound good in the right conditions, but if you had it directly infront of you it would not impress you...
Looked cool as heck though........
http://www.sonicflare.com/archives/eminent-tech-trw-17-the-most-powerful-subwoofer-in-the-world.php
Reports a flat response down to 1Hz. Interesting concept.
Replies (8)
pigwiggle on 11/3/2005 14:48:57
Try this site instead:
http://www.eminent-tech.com/main.html
Specifications:
Amplifier Requirement 200 watts @ 8 ohms
impedance 8 ohms 0Hz - 40Hz
Frequency response 1Hz – 30Hz +/- 4dB
suggested crossover 30Hz @ 18dB/octave
Sensitivity 90dB 1 watt 1 meter @10Hz
Maximum acoustic output >110dB between 1 and 30Hz.
Distortion typically 3% or less between 1 and 30Hz @90dB
Warranty – 3 years parts and labor
Price $12,900 each, not including amplifier or crossover
Victor on 11/3/2005 15:44:54
hmmm... interesting concept,
must be effective at lower frequencies.. but what about the transient response, ?????? with the fast bass beats in this modern day music, how are you going to control a rotating fan at high speeds to produce simultaneous wave forms of different frequencies at such a fast speed...
well i really cant comment much on this until i actually see it perform. but anyways its gonna take ages before its into the market and i highly doubt someone spend $13000 and more for a 200wrms subwoofer..
Technically on a sceintific front it may be a very good achievement but its way too far before it can be commercialsed and becomes a success in the market.
Victor..
pigwiggle on 11/3/2005 16:17:34
“how are you going to control a rotating fan at high speeds to produce simultaneous wave forms of different frequencies at such a fast speed...”
The fan blades rapidly change pitch while the RPM of the rotor remains constant. The article gave the impression that the pitch of the blade was changed by a conventional voice coil and was as responsive as a conventional speaker. I guess changing the RPMs would control the volume.
Victor on 11/3/2005 16:44:46
""""A motor controller and electric motor rotate a set of blades at a constant speed. The rotary woofer pitch mechanism uses a conventional voice coil and magnet assembly. This is connected to your amplifier to pitch blades in proportion to the applied audio signal. As the blades pitch while rotating a pressure wave is generated, the degree of pitch controls the amplitude of the pressure wave. Air is allowed to transition through the blades. Thus oscillating the pitch of the blades creates sound while they are rotating .""""
P0werLifter on 11/3/2005 16:54:07
While it may be a very interesting design, still looks like a $13000 fan from the 1960s to me.
Victor on 11/3/2005 16:59:45
its a nice concept .. but just not worth the price... i cud sacrifice few sub-sonics for such kind of money..hehehehe
also... its more easier to move a lighweight cone than a metal rotor blade. and i feel that the transients on a conventional woofer will be anyday better than a Fan..
Also, this sub is optimised for performance upto 30Hz , only some of the best mids available can do as low as 40Hz at decent volumes.. so filling up that gap in a system will be harder, and those subsonics are no ways going to be heard, cause they are completely out of human perception of sound, it can only be felt, more sub-sonincs in a car means more vibration and less sound heard ... mean more rattling and using more and better sound damping material and in all will be a great expense..
so as of now, with my limited understanding of this FAN, i really think that for use in automobiles this is just a $ 13000 fan creating more problems then actually helping...
Victor...
swez on 11/4/2005 08:14:35
This audio toy will never make it out of the hanger at $13,000 a pop. I have bought brand new cars for less.
Interesting concept here. It seem to operate much like the propellers on a prop driven plane. By changing the pitch of the blades, the frequency response changes as well. OK, not a new idea... just a new application.
As for frequency and transient response, who cares? This design has limited frequency response. Mostly in the sub-sonic range. Fine in a theater environ, where we want to feel the rumble of a volcano or the launch of a space shuttle, etc. Other than that, I don't see much value for the price tag noted.
Test tones are one thing to reproduce. However, complex subwoofer tones have a lot of transients and harmonics as well. (like a large Church organ or perhaps a synthesizer's tone generators) But, how many listen to that all the time?
Put it to the test with a Leap plotter and complex bass tones that one can hear. Once the numbers are published, the price likely till drop to under $500.00 or become a novelty at most any audio trade show.
Interesting idea yes, practicallity for the average HT buff is suspect. Only the guy who has money to burn and wants the latest gizzmo, would even consider this one. (In My Not So Humble Opinion)
Swez
ttocs on 11/4/2005 13:11:44
reminds me of the PG cyclone. It was neat, and could sound good in the right conditions, but if you had it directly infront of you it would not impress you...
Looked cool as heck though........
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