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Speaker Baffles
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From Glamour magazine, 11 Things Guys Just Don't Understand about Women, it seems that the biggest beef men have with women is that they can't understand our style of communication. Seriously, six of the eleven things were about communication!
Men and women have very different styles of communication. I know, newsflash, right? Let me break it down and offer some tips to improve communication between the sexes. There are five major differences in communication between men and women, in my personal experience.
The second major difference in communication styles between men and women is the distinction between direct and indirect communication, specifically when it comes to making and agreeing to a request.
Socially, men are conditioned to make direct requests, and to expect those requests to be either honored or rejected. In other words, he asks for something, and receives a clear "yes" or "no" in response. Women are conditioned in a way that, if we make requests at all, they're done indirectly. And often, when a woman responds, she might not be saying what she really means. This is understandably maddening to men. Why would she do that?
Women are socialized to believe that selfish is a four letter word. By the time most women grow into adulthood, we've had years of practice getting what we need without directly requesting it, or settling for less than what we really want. We feel guilty saying "no" to a request from someone we love, even if it's inconvenient for us or goes against what we really want.
This baffles the minds of men, and causes arguments in most relationships. For example, the man will ask if he can go out with the guys Friday night. The woman says, "Yes, of course, you don't have to ask permission!" and then sulks for the rest of the weekend. Translation: "Yes, honey, you can go out with the guys. But if you have too much fun or stay out late I'm going to worry that you like them more than you like me."
Advice for guys: Most of the time, she's not thinking this stuff consciously. It's her wounded inner child (part of the subconscious mind) talking. Luckily, there's a pretty easy fix. When you ask and she replies with a "yes", look her deeply in the eyes and say, "Are you sure? Do you have any reservations about it/problems with it at all?" This will tell her that she matters to you, and if she's mature enough and does have reservations, she'll spill the beans then. Another thing you can do after the fact is to pay a little extra attention to her for the rest of the weekend, in unexpected ways. Give her a big hug, or tell her some specific thing you love about her. Don't over-do it, or she might think you're trying to make up for something bad you did while you were out. Little things will help put her inner child at ease.
Advice for women: If you don't want your guy to go out, just say no! Or at least talk to him about it. Be willing to share your feelings, even if they don't seem to make sense. Maybe the friend he's going out with is a hound dog and you're subconsciously worried his behavior might rub off on your honey. Logically you know it would never happen, but there's a little part of you that's worried. Lighten it up if you can, but speak your truth. It's perfectly acceptable to say, "I know you're nothing like Joe, but there's still a small, mildly neurotic part of me that worries." Are there conditions to your agreement? Tell him up front, not after the fact. If you expect him to do yard work all weekend, he'll take it as punishment if he doesn't know about it in advance.
One sign of maturity and enlightenment is the ability to speak your truth in a clear way that does not intentionally harm another. Men and women both have challenges with this aspect of personal growth. Men can learn to speak without harming the other person, taking a careful look at an "honesty at all costs" policy. Direct communication doesn't have to be blunt, and it doesn't have to be hurtful. And women can practice communicating more directly. One tool you can use is to pause before responding to a request. We're conditioned to respond immediately to a request, usually with a "yes." If instead, you listen to the request and then pause before answering, you can decide what you really want to do. You can also practice saying, "I'm not sure, I need to think about it. Can I get back to you?" Trust me, the world will not implode if you learn to say "no."
Johanna Lyman
Spiritual Love Coach
Romance Recovery: Whether You Stay or Go, Do It With Courage, Clarity and Ease
http://www.romancerecovery.com
Subscribe to my blog here: http://www.romancerecovery.com/blog/
Surround Sound: Proper Surround Sound Setup
If you are in the market for a brand new surround sound system I'm pretty sure you've been a little baffled by all the options, bells, whistles, gadgets, gizmos, and price tags on the market today. Trust me, you are not alone. One of the most baffling things to many potential surround sound system consumers is where on earth should you put all the speakers. I intend to answer that question and a few more over the course of the next few paragraphs and hope that you will read along.
The first thing you need to understand is that there are several different types of surround sound systems. The industry standard and most common is the 5.1 channel surround sound system. This set up calls for the use of five speakers plus one subwoofer in addition to the receiver. The five speakers are the front speakers which include a left, right, and center speaker and the left and right surround speakers that are located to the left and right from the rear. You should also have a subwoofer located behind you in order to create the 'bass notes' of sound. The next two types of surround sound systems include the 6.1 channel and 7.1 channel system. The primary differences in these are the addition of one additional speaker for each.
You will be glad to know that most receivers will accommodate the 8 total speakers of a 7.1 channel surround sound system but you may want to check in order to be certain you can upgrade if you chose to buy a 5.1 channel system for the time being. The addition of speakers when you upgrade change the layout of the speakers in your home. The more speakers you have, the greater sound you will enjoy, however, the better the quality of your speakers, the better quality your sound will have. In other words don't go with lower quality speakers in the beginning in order to have more speakers, as you will be shooting the quality of sound you can experience in the foot. It is better to buy fewer speakers in the beginning and add to your system over time in order to receive better quality.
When it comes to the placement of the additional speakers if you upgrade to a 6.1 channel surround sound system you will move the speakers currently in the left and right rear to the left and right side and place the new speaker in the center back. If you then upgrade to the 7.1 channel surround sound system you will move the speaker that is in the center to the rear left and place the new speaker to the rear right. This allows you to be literally surrounded by the sound in order to maximize your listening experience.
Of course this is only a recommendation and it is entirely up to you what will work best within your home and according to your tastes and wants in a surround sound system. Not everyone hears music or sound the same and the experience for each will vary greatly from one person to the next. For this reasons it is also a good idea to be sure you have listened to the system in a store before deciding on one and bringing it home. This is a wise decision regardless. I also recommend taking more than one CD or DVD for the listening process in order to make sure the quality is consistent through different mediums.
While the setup of your system is very important to the sound experience it is quite difficult provided you follow the directions (you didn't forget to read those did you?). Whether this is your first home theater or surround sound system or one of many upgrades you've made along the way I'm sure you will agree that the sound is far superior to the two speaker systems of days not that long ago.
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-An interesting question for Acoustics- Subwoofer related?
If there a formula that tells you about how much Decibels you get by displacement of speaker...........
-Frequency
-Total Displacement of driver (active Area x Excursion)
Assuming Infinite Baffle with No Room Gain, just Displacement of speaker.
Calculating the Maximum Output of a Direct Radiator Loudspeaker (within a 2π-sr free field)
Note: the equations and Thiele-Small parameters listed below are intended to be used with the standard International System of Units (aka SI Units).
Vas = volume of air having the same acoustic compliance as the driver (aka drive unit or transducer) suspension;
fs = free-air resonance of the driver;
Qes = Q of the driver at fs with respect to electrical resistance only;
Qms = Q of the driver at fs with respect to non-electrical. i.e., mechanical, resistance only;
Qts = total Q of the driver at fs with respect to all driver resistances;
Sd = effective diaphragm area;
Xmax = peak linear displacement or excursion of the diaphragm; (typically specified by manufacturers in millimeters);
Vd = peak displacement volume of the driver;
ρ = density of air, corrected for temperature, pressure and humidity; (the density of air is typically 1.18 kg/m³ at sea level, 50% RH and 25 °C);
c = speed of sound, corrected for temperature, pressure and humidity; (typically 345 m/s at sea level and 25 °C);
f3 = −3dB or half-power point, aka the cutoff frequency, of the loudspeaker system;
Vb = net internal volume of the loudspeaker enclosure;
η0 = reference efficiency;
kp = power rating constant;
Par = steady-state, displacement-limited acoustic power rating of the loudspeaker system in acoustic watts.
If Vd for the driver is not given start by calculating Vd using the basic Thiele-Small parameters Sd and Xmax.
Vd = (Sd)(Xmax)
Next you will need to calculate the cutoff frequency (f3) for the loudspeaker system. After you have obtained the peak displacement volume of the driver (Vd) and the cutoff frequency (f3) of the loudspeaker system you may then proceed to calculate the steady-state, displacement-limited acoustic power rating (Par) of the loudspeaker system.
Closed-box (aka acoustic suspension) enclosure (for a Qtc = 1.1):
Par = 0.85(f3^4)(Vd^2) (1)
Vented-box (aka bass reflex) enclosure:
Par = 3.0(f3^4)(Vd^2) (2)
At this point you should now be able to calculate the approximate steady-state, sound pressure level of a single loudspeaker.
To convert acoustic power (Par) into sound pressure:
SPL = 112 + 10 log (Par) (3)
Relationship between f3, Vd and Par for a Vented Box Design:
http://i558.photobucket.com/albums/ss28/HenrySpencer/lg_signal_relationship_for_vb_desig.png
######################## RESOURCES ########################
Thiele, A. N., Loudspeakers in Vented Boxes, Parts I and II
Small, Richard H., Closed Box Loudspeaker Systems, Parts I and II
Small, Richard H., Direct Radiator Loudspeaker System Analysis
Small, Richard H., Vented Box Loudspeaker Systems, Parts I through IV
Audio Engineering Society - Journals and Anthologies
http://www.aes.org/publications/anth.cfm
DIY Audio Projects - Technical Audio and Reference Information
http://diyaudioprojects.com/Technical/index.htm
[PDF] Environmental Effects on the Speed of Sound
http://www.rane.com/pdf/ranenotes/Enviromental%20Effects%20on%20the%20Speed%20of%20Sound.pdf
Does anybody know the meathod to work out the porting for my bass cabenet? [sic]
http://answers.yahoo.com/question/index?qid=20080421141305AAdKp8f
When building speakers how do you calculate volume?
http://answers.yahoo.com/question/index?qid=20080623050134AAqnjd7
Loudspeaker Design Cookbook by Vance Dickason
http://www.audioxpress.com/bksprods/products/bkaa68.htm
audioXpress (Old Colony) Loudspeaker Reference Books
http://www.audioxpress.com/bksprods/BKSLOUREF.htm
http://www.audioxpress.com/bksprods/BKSLOUDES.htm
http://www.audioxpress.com/bksprods/BKSLOUINT.htm
Loudspeaker Design and Construction Resources
http://docs.google.com/View?id=dhpmqnbb_8cqqcq2gx
This woman can’t gain weight: She’s 21, 60 lbs.
At age 21, Lizzie Velasquez weighs only 60 pounds even though she consumes 5,000 calories per day. But despite her rare condition, she has a book coming out and plans to spread her message that “you don’t need to be judged by your appearance.” Health - Weight loss - Weight - Shopping - Lizzie Velasquez
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