How do i build a subwoofer box for my jeep?

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Rick

i know the speakers i want, Polk MOMO's 2 x 10". I go to polks site and they give all kinds of spec for the speaker. one being Vas = 1.083 cu. ft. i think this is the volume for the internal of the box. but is this after subtracting teh volume the speaker itself takes up? if so what value is that? would a inside dimension of 10"x14"x13" each side work good for a sealed enclosure. making outside dims 11.5"X15.5"x28.25" using 3/4" MDF. then i would likely liquid nail and screw the box together, using the liquid nails like a caulk on all seams.
then would i want polly fill for this size box? what does poly fill do?
any insight to any area will be appreciated.

Answer
Vas (equivalent air compliance) is the volume of air that offers the same degree of restoring force on the cone as that of the cone's suspension.

The Vas may be use to calculate the volume (Vb) of the enclosure.

Vb=VAS(Qts/Qcb)^2+1

A subwoofer and it's box have there own Q (quality) factor (Qcb=Q of closed box, Qts=Q of speaker)and together they form what is known as the system Q. A system Q of 0.7 gives the smoothest roll off in the low frequency response of the system. Above 0.7 causes a hump in the bass response and below this causes the bass to fall off at a higher frequency.

A program called WinISD will help you in the design. http://www.linearteam.org/download/winisdpro/winisdalpha.exe

Here are some tips on box building http://spkrbox1.spaces.live.com

How to choose a amp or receiver for my speakers.?

Justin

Im trying to design a home audio system using some Rockford Fosgate speakers and a sub woofer. I'm designing this to be permanently attached to my desk. The speakers and sub are all 4-ohm but the powers obviously vary. There are two types of speakers one rated 40W and the other type 60W. the sub is rated for 600W. These are all RMS value. I'm having trouble understanding what to look for in my receiver. I am also willing to use a car amp if someone can inform me how i can effectivly operate it inside. I dont care about appearance as i want to rout the knobs and switches to another area and match the appearance of the rest of my setup.
I want this for a gaming set up. I am building my own desk and am trying to make it my "gaming station" so to say. I want it to really kick. Say im playing a game and an explosion happens next to my character i want to hear it and feel it as though i was there. Obviously not to the extreme that it blows me away or anything but enough to feel it. I have no knowledge of audio but am going to school for electrical and automation so im starting to understand the circuitry that runs the speakers. if you can give me some links and examples of what i might use id appreciate it. I am designing my desk to have two small speakers behind my speakers as well as two up closer to the display and tweeters if needed as well as a sub or two underneath by the floor. so any suggestions on speakers would be appreciated.

Answer
Are you talking about speakers or "drivers"? Drivers are usually connected to a crossover-network to create a nominal 8 ohm impedance.

When you say "audio system" - are you talking about a stereo system (2.1) for music or a 5.1 system for movies?

That subwoofer - does it have 4 speaker wire inputs and 4 speaker wire outputs so you can send left/right full-range signals to the sub and it will strip off what it needs and pass the rest onto the more conventional speakers?

All of these details matter.

-----------------------------------------------------------

Ok - A used Dolby Digital 5.1 AV Receiver is probably what you want. But - you need to make sure you are designing each 'speaker' with a tweeter, mid-range and crossover-network.

You are also going to want a separate plate-amp for your un-powered subwoofer. Try www.partsexpress.com for a speaker building site that can sell these.

You should also look up "Bass Shakers". These are transducers you screw into the base of your chair and then run with a separate amp from the SUBWOOFER output of your 5.1 receiver. It gives a tactical bump/feel to explosions. "ButtKicker" and "..." (crap - cannot remember the other popular brand) these are cool things to have.

My advice:

Hit you local Craigslist. You want to find a used 5.1 receiver (Yamaha, Denon, Pioneer or even Onkyo) and a used Stereo.

This way - you will save money and if you blow things up - you will not be out a lot.

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What is the best soundcard on the market?

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Stephen J

I've been using onboard sound for the last year or 2 for my comp. & I've been saving up for a soundcard. So with that in mind what soundcard would you recommend for my computer? Keep in mind I value quality of sound vs. distintion between speakers (since I only have a 2.1 speaker system. I mainly play Halo 2 & listen to MP3's and watch videos on my comp.
Thanks for answering.

Answer
On board sound are good enough if you have only 2.1 Speakers. But if you must, Sound Blaster X-FI Series is a good choice. They are range from around $70 to $179, depends on which model you pick.

How do i build a subwoofer box for my jeep?

Rick

i know the speakers i want, Polk MOMO's 2 x 10". I go to polks site and they give all kinds of spec for the speaker. one being Vas = 1.083 cu. ft. i think this is the volume for the internal of the box. but is this after subtracting teh volume the speaker itself takes up? if so what value is that? would a inside dimension of 10"x14"x13" each side work good for a sealed enclosure. making outside dims 11.5"X15.5"x28.25" using 3/4" MDF. then i would likely liquid nail and screw the box together, using the liquid nails like a caulk on all seams.
then would i want polly fill for this size box? what does poly fill do?
any insight to any area will be appreciated.

Answer
Vas (equivalent air compliance) is the volume of air that offers the same degree of restoring force on the cone as that of the cone's suspension.

The Vas may be use to calculate the volume (Vb) of the enclosure.

Vb=VAS(Qts/Qcb)^2+1

A subwoofer and it's box have there own Q (quality) factor (Qcb=Q of closed box, Qts=Q of speaker)and together they form what is known as the system Q. A system Q of 0.7 gives the smoothest roll off in the low frequency response of the system. Above 0.7 causes a hump in the bass response and below this causes the bass to fall off at a higher frequency.

A program called WinISD will help you in the design. http://www.linearteam.org/download/winisdpro/winisdalpha.exe

Here are some tips on box building http://spkrbox1.spaces.live.com

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Sell-back value of Bose Companion 3 Series II speaker system?

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I know the retail value is around $250 or something like that. I got this system for free and have enjoyed it, but I need some quick cash. I now almost everybody and their mother harbors a horrible opinion about Bose, so I was wondering how that should affect my asking price and I also just wanted to know how much I should even try to sell it for anyway.

Answer
You pose a very interesting question.

Yes, Lots of members of forums, and similar types of internet/ infotech based feeds have horrible opinions about Bose.
Whether they are valid opinions - I won't get into that unless you want the facts.

But - with that said, how many of those members with horrible opinions make up the Market??
My best guess is 10% at best.
So this means the rest of 90% knows Bose as 1] respectable company 2] good products.
Now this 90% is made up of a variety of consumers. Most of them just don't know, but have seen Bose Ads in magazines, TV ads, Radio ads, random Internet/Google ads etc.
... and because of these ads, this bulk of consumers are highly likely to go and look at any Bose product and after a quick demo, say, "Wow sounds good! - But very expensive... SO IT MUST BE GOOD! - I heard they are the best."
At that point, they will probably not make the investment as who has $500+ for a CLOCK/RADIO/CD PLAYER [Bose Wave music system]... or $300 for a Ipod Dock... or $thou$ands for any of their 2.1/5.1/6.1 Cinemate/V-series/Lifestyle series systems?? --- --- so they go home and DREAM big... save up, in hopes to own Bose one day. Awesome... aspirations are good.

Then they by chance see some negative comments about Bose online or from a friend... and think:
-"Oh they are just jealous - cuz they can't afford it themselves..."
-"Oh well, Bose is USA's most successful audio companies - and the Best will always have enemies/HATERS - just haters"
-"Oh, well, Bose speakers is in the Sistine Chapel / Staples Center / Ferrari / oh and of course: GM / MAZDA / ETC... so they must be good - good enuff or the POPE, good nuff for ME! yahoo!!"
-"Oh, I heard their demo [all 10minutes] and WOW such small speakers, they sound GREAT! --I'LL LET ME EARS DECIDE THANK-YOU"
-"Oh My Grandpa, Dad had Bose... I'll get Bose - great American company..."
--- did I miss anything?? ----
... so they will negate the advice on forums... ... Well, maybe they should based on how much useless, derogatory, missleading information the Net... ... So they go and try to save $$ for the day they can afford Bose.

Then --- OOOO --- They see a great deal on eBay or Craigslist or Kijiji... and can save hundreds or even thousands.

So my answer:
You can get almost full price for your Companion 3 speakers.
All you have to do is explain how GREAT IT SOUNDS, HOW ABSOLUTELY MINT IT IS, HOW IT'S ONLY 5 DAYS OLD, HOW NICELY YOU'VE KEPT IT, HOW IT'S BEEN IN A SMOKE FREE ROOM, HOW IT'S BEEN PET EVERYDAY TO SLEEP...
and then Post it on eBay, Craigslist, Kijiji, all local newspapers, on TV, on Radio....
...
And who knows, you may even get more than $250.
I'd Guess - if you do enough of what Bose does, you'll get over $500 for it...
Then you can get their Bose Companion 5!!!
FREE UPGRADE!!! YAHOO!!!
Source(s):
But seriously, Craigslist will probably yeild the highest bid... but you may have to show a few ppl how well it works. Hope this helps.

What kind of speakers I have to buy if...?

Barrr

What kind of speakers I have to buy if...I want powerful, clear, and loud speakers, so what do I need to know in order to find powerful speakers For my LapTop?
I need to know about the watts, the channels or WHAT?

Answer
The speaker type that you're probably looking for are called "active" or "multimedia" speakers. "multimedia" just refers to computer speakers. "active" is the antonym of "passive". "Passive", used to describe subwoofers most commonly, means that it is just a speaker, no built in amplifier. "active" obviously refers to speakers with their own power. Most people buy "multimedia" speakers for their computers, and there are a lot to choose from. However, you don't have to use this system. You can also use your home stereo or av receiver. It just depends on things like how mobile (if at all) you want your laptop's sound to be, how clear, loud, and powerful you want them to be, and how much you want to spend. How clear they sound is largely the result of what level of what brand. i.e. Klipsch, Yamaha, Polk Audio, Infinity, JBL, are a few makers of quality electronics and speakers. You will have to go to an electronic retailer like Fry's or Best Buy and take advantage of there displays. And when you do, don't be afraid to crank that s**t up. You need too in order to hear 2 things.(1) The quality of the sound @ power (high), and (2) hear the relativity of the wattage rating. I'd suggest a wattage, but "powerful, clear, and loud speakers" has different values to different nerds. If you listen to music, and don't watch movies or play video games, stereo or 2.1 is all you need. The .1 is a subwoofer, already integrated with the set 2.1. If you want surround sound or 3d sound (whatever other names they've come up with), then you can get a 4.1, 5.1, or 7.1 system. You might need to pick up an external sound card (7.1) depending on what your laptop has or doesn't have. That's WHAT with the channels. I think a 2.1 set of speakers rated @ 80watts (max) will be sufficient, but you'll know when you go to the showroom. Good luck!

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