Someone teach me about subs!
#1
Senior Member
True Car Nut
Thread Starter
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Likes: 0
Received 0 Likes
on
0 Posts
Someone teach me about subs!
Wish I had the knowledge, but I don't. I do know there are a lot of people out there who do though.
Here'* a starting point, and I think it might be a good reference for other people in the future. We can combine the knowledge here and put it in the tech docs section.
http://www.woofersetc.com/p9263/SA10...-Subwoofer.htm
What do these numbers mean?
And for the following, what does "yields F3 of 50 Hz" mean? What is Qtc alignment?
VENTED :
SEALED :
Here'* a starting point, and I think it might be a good reference for other people in the future. We can combine the knowledge here and put it in the tech docs section.
http://www.woofersetc.com/p9263/SA10...-Subwoofer.htm
What do these numbers mean?
- FS : 31.6 Hz
- Qts : 0.45
- Qes : 0.49
- Qms : 5.64
- VAS : 21.9 L
- Mms : 187.4 g
- XMAX: 19mm one way
And for the following, what does "yields F3 of 50 Hz" mean? What is Qtc alignment?
VENTED :
- 1.25 - 1.5 cubic feet tuned to 30 - 35 Hz
- Yields F3 in the mid to high 20s
SEALED :
- 0.55 cubes for 0.707 Qtc alignment
- Yields F3 of 50 Hz
#2
Senior Member
Posts like a Turbo
Join Date: Jul 2010
Location: Sacramento, CA.
Posts: 326
Likes: 0
Received 0 Likes
on
0 Posts
What do these numbers mean?
And for the following, what does "yields F3 of 50 Hz" mean? What is Qtc alignment?
- FS : 31.6 Hz
- Qts : 0.45
- Qes : 0.49
- Qms : 5.64
- VAS : 21.9 L
- Mms : 187.4 g
- XMAX: 19mm one way
And for the following, what does "yields F3 of 50 Hz" mean? What is Qtc alignment?
- 1.25 - 1.5 cubic feet tuned to 30 - 35 Hz
- Yields F3 in the mid to high 20s
- 0.55 cubes for 0.707 Qtc alignment
- Yields F3 of 50 Hz
Qts = Qts is a measure of the driver'* tendency to resonate at Fs, based on its overall characteristics.
Qes = A measure of the driver'* tendency to resonate at Fs, based on its electrical characteristics, like magnet strength, magnetic circuit characteristics, etc.
Qms = A measure of the driver'* tendency to resonate at Fs, based on its mechanical characteristics, like surround compliance, the compliance of the spider, weight of the cone, etc.
Vas = The volume of air that has the same compliance ("springiness") as the driver'* suspension. Because less air is more "springy" than more air, a large Vas represents a "loose" suspension
Mms = Measured in grams, this is the mass of the cone, coil and other moving parts of a driver, including the acoustic load imposed by the air in contact with the driver cone.
Xmax = Linear (one-way) travel of the cone. Xmax is used to determine the maximum linear SPL capability of the driver, and can be defined in a number of ways.
F3 = Is the frequency where the response (loudness) is down from the reference level by 3 dB.
Qtc alignment = value for the damping provided for a driver in a sealed enclosure. Denotes the enclosures ability to control the driver response at resonance. Qtc = 0.707 is the optimum value for sealed enclosures, providing flattest response and highest SPL for deep bass extension.
Let me know if you have any questions on any of the explanations, I can go further into detail if needed.
#3
Administratus Emeritus
Certified Car Nut
Phew!.... And why I stay away from Audio help unless it is in my grasp. Which is mainly electrical. Nice thread X, we need more like this to bring GMF to the same level we are at in Mechanical. Audio has become an important part of Car Maintenance. And continues to grow.
#5
Member
Posts like a V-Tak
Join Date: Apr 2009
Location: East Moline, IL
Posts: 80
Likes: 0
Received 0 Likes
on
0 Posts
In general T/* parameters aren't overly important unless you are designing an enclosure (and know what you're doing). In general, just use the recommended box values given by the manufacturer, mix it in with some advice from people who have used the subs and you'll be set.
Here'* a page I have bookmarked that explains T/* stuff.
http://www.soundsolutionsaudio.com/f...ers-explained/
Here'* a page I have bookmarked that explains T/* stuff.
http://www.soundsolutionsaudio.com/f...ers-explained/
#6
Senior Member
Posts like a Turbo
Join Date: Jul 2010
Location: Sacramento, CA.
Posts: 326
Likes: 0
Received 0 Likes
on
0 Posts
In general T/* parameters aren't overly important unless you are designing an enclosure (and know what you're doing). In general, just use the recommended box values given by the manufacturer, mix it in with some advice from people who have used the subs and you'll be set.
Here'* a page I have bookmarked that explains T/* stuff.
http://www.soundsolutionsaudio.com/f...ers-explained/
Here'* a page I have bookmarked that explains T/* stuff.
http://www.soundsolutionsaudio.com/f...ers-explained/
Thread
Thread Starter
Forum
Replies
Last Post
Boreas
General GM Chat
9
01-16-2006 03:56 PM
harofreak00
Performance, Brainstorming & Tuning
12
12-23-2005 12:49 PM