Subwoofers

[glen]

The smaller the room, the higher up the room transfer function starts.
I think at the wavelength equal to the longest dimension in the room, you start to get a 6db/octave increase in efficiency from that frequency on down.

In other woords, it is actually easier to achieve good bass in a car or small room, than in a large home Theater room.

 

[Kelvrick]

Originally posted by: shuttleteam
This can be scary on a capable system.

(just let go of the chandelier to type this! )

Cheers!

So its quicktime. How do I move it to my system. Someone turn it into another format so my xbox can stream and I can scare my neighbors.

 

[glen]

http://www.pcavtech.com/abx/basscds.htm

Top 30 Bass CDs - analyzed by Eric Busch
Top 30 list of CD's with subsonic content.


Number Frequency DBfs Track # Time Album Name Artist Label Catalog #

1 5hz -13.7 1 3:30-8:10 Battle Music of Beethoven and Liszt Beethoven Telarc CD-80079
2 5hz -16.1 4 5:14-5:15 Big Notes Flim & The BB's DMP CD-454
3 7hz -14.5 1 12:30-15:10 1812 Overture Tchaikovsky Telarc CD-80041
4 7hz -22.1 35 ALL Sonic Booms 2 Mobile Fidelity Bainbridge BCD 6285
5 8hz -20.1 10 4:15-4:16 Toxic Bass Toxic Bass I.B.P. IBP-0008-2
6 9hz -14.8 8 0:20-0:40 Sonic Booms 3 Mobile Fidelity Bainbridge
7 10hz -11.8 20 3:10-3:20 Great Fantasy/Adventure Album Erich Kunzel Telarc CD-80342
8 10hz -15.5 21 ALL Great Fantasy/Adventure Album Erich Kunzel Telarc CD-80342
9 10hz -19.5 1 0:20-0:30 Food For Woofers Volume #3 B&W KOTF I.R.S. FFW 003 CD
10 10hz -20.5 5 2:20-2:40 Fantastic Journey Erich Kunzel Telarc CD-80231
11 12hz -14.9 12 3:10-3:20 Illegal Bass Bass Outlaws Newtown NTN 2210
12 13hz -17.3 1 ALL Time Warp Erich Kunzel Telarc CD-80106
13 16hz -11.7 16 3:00-3:40 Romantic Organ Music Volume 2 Peter Hurford London 421 296-2
14 16hz -11.9 18 0:12-END It Came From Outer Bass 2 Techmaster P.E.B. Newtown NTN 2211
15 16hz -12.5 2 3:20-END Quad Maximus Bass Mekanik Pandisc PDD-8848
16 16hz -14.5 3 ALL Bass Box Seventh Order Hip Rock DIDX 018599
17 16hz -16.7 10 0:38-5:06 Tyranny For You Front 242 Epic/Sony EK 46998
18 16hz -21.8 1 0:48-0:50 Joshua Judges Ruth Lyle Lovett Curb / MCA MCAD-10475
19 17hz -8.6 1 0:10-0:20 Chiller Erich Kunzel Telarc CD-80189
20 18hz -7.1 1 3:50-3:55 Illegal Bass Bass Outlaws Newtown NTN 2210
21 18hz -14.5 3 1:30-1:43 Bass Ecstacy Bass Erotica Neurodisk NRD-31005
22 19hz -6.7 7 0:00-0:10 Drivin Bass Bass Connection Neurodisk CD-31004
23 19hz -9.6 6 1:10-END More Bass Boom Bottom Power Supply Hip Rock DIDX 022094
24 19hz -9.9 2 ALL Cyberbass Virtual Reality Bass Syndicate D M Records
25 20hz -4.5 5 1:10-1:20 Bass Society Bass Society Majammy E-SA-1010
26 20hz -7.9 1 ALL It Came From Outer Bass 2 Techmaster P.E.B. Newtown NTN 2211
27 20hz -8.1 12 0:00-0:10 Bass Is Loaded Bass Hit Neurodisk CD-31002
28 20hz -10.5 9 ALL Bass Overload Bass Alliance D M Records DMR-41269
29 22hz -4.3 11 ALL Drivin Bass Bass Conection Neurodisk CD-31004
30 22hz -7.4 12 0:40-END Bass Overload Bass Alliance D M Records DMR-41269


Frequency: lowest significant frequency with potential to be percieved.
DBfs: decibels below maximum digital record level.
Time: point(s) during track to find lowest frequency (ALL=various points in track).
CD's were played on a SONY CDP-610es (confirmed flat to below 2hz) and Measured on a Tektronix 2630 FFT analyser.

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Web Page Created by David Carlstrom.
Last Modified: 7/1/2001

 

[lobadobadingdong]

I think the next generation subs will start to be smaller with the same output as the old bigger is better bit going out the window.

 

[glen]

Originally posted by: lobadobadingdong
I think the next generation subs will start to be smaller with the same output as the old bigger is better bit going out the window.

You cannot change the laws of physics.

 

[lobadobadingdong]

true but you can learn better means of effeciency. take a 10" solo baric from 4 years ago and a 10" solo from today, the magnet is tiny bit bigger, the spyder is greatly improved, now the 10" of today is nearly the equivelent output of the 12" solo from 4 years ago.

 

[glen]

Originally posted by: lobadobadingdong
true but you can learn better means of effeciency. take a 10" solo baric from 4 years ago and a 10" solo from today, the magnet is tiny bit bigger, the spyder is greatly improved, now the 10" of today is nearly the equivelent output of the 12" solo from 4 years ago.

Marketing.
If it does anything differently, it simply reaches its limit at a lower wattage. Unless they doubled the excursion, it is not nearly as good as the driver of years ago.

Take the surface area and multiply that by the excursion. The resulting volume is an absolute limt for a driver and a great way to compare subs.

 

[spidey07]

Originally posted by: glen

Originally posted by: lobadobadingdong
true but you can learn better means of effeciency. take a 10" solo baric from 4 years ago and a 10" solo from today, the magnet is tiny bit bigger, the spyder is greatly improved, now the 10" of today is nearly the equivelent output of the 12" solo from 4 years ago.

Marketing.
Unless they doubled the excursion, it is not nearly as good as the driver of years ago.

Take the surface area and multiply that by the excursion. The resulting volume is an absolute limt for a driver and a great way to compare subs.

bingo.

You can make a small sub work very well. You just need a whole lot of excursion and a crapload of power (thousands of watts).

 

[Apex]

Originally posted by: glen

Originally posted by: lobadobadingdong
true but you can learn better means of effeciency. take a 10" solo baric from 4 years ago and a 10" solo from today, the magnet is tiny bit bigger, the spyder is greatly improved, now the 10" of today is nearly the equivelent output of the 12" solo from 4 years ago.

Marketing.
If it does anything differently, it simply reaches its limit at a lower wattage. Unless they doubled the excursion, it is not nearly as good as the driver of years ago.

Take the surface area and multiply that by the excursion. The resulting volume is an absolute limt for a driver and a great way to compare subs.

Hoffman's Iron Law.

Hoffman's Iron Law states that the efficiency of a woofer system is directly proportional to its cabinet volume and the cube of its cutoff frequency (the lowest frequency it can usefully reproduce).

Glen is right.

 

[dmcowen674]

Originally posted by: shuttleteam
This can be scary on a capable system.

(just let go of the chandelier to type this! )

Cheers!

Holy crap, almost breaks glass.

Wonder what was used to produce those super low modulations???