down firing subwoofer

[zyon4lyfe1]

does that shit make a difference ? lol

[TidyTRAPHOUSE561]

@zyon4lyfe1 yeah it does you cant just throw a speaker in box and expect it to slap.

[507jeffrey]

OIIO

[tugabotdotcom]

Does it matter the design inside?

[fedeobregon]

sos muy pelotudo

[3Deity]

Logitech - What the hell do they know about acoustics? Look up W Folded Horn and prepare for serious bass, frequency extension and improved sensitivity. Most people making subwoofers don't even know what one is - The only time you should notice it is when its switched off. This is a 'bass bin' and a completely different creature. Also read up on chokes and the number of windings you need else you'll be dumping tons of mid and treble into your driver that it can't reproduce except in heat.

[33river]

Hold [Shift] to make straight lines....

[Jangaid]

very good,txn

[666xXxXxXx666]

How can the tuning for this be right? These need to be some powerful ass subs if they need a port that big... What were you planning on putting in there? Orion HCCA's???

[Miguelc271086]

Because of the time it will take for the sound wave to travel all around and come back to the front, it will be out of phase at a certain frequency. Similar to what happens to the Scoop bins.

[pauogovernadordixsep]

voce escreve torto!!

[ACDCJUNKEY]

Dude I got a downfiring ported box in my 98 chevy under my backseat.. and it sounds so shity on low notes.. and I can't figure out why other then haveing to flex back up and thats missin with it.. Any ideas?

[nTTaLeNt]

Buenas amigos veo que les gusta lo que se refiere a sonido!!! Me gustaria que me orienten!! si alguien puede claro!! Tengo 2 bajos kicker cvx 12" y quiero hacerle un cajon especial!!! me han comentado que tiene que llevar tuneles para que se escuche mas el bajo!! ando un poco desorientado! como deberia ser ese cajon por dentro!!!

[Carmiel08]

ok i must be retarded or something but how do you "tune" a box your building

[racingduckss]

bandpass is more efficient

[profEVJ]

@racingduckss

- evjLight.com is more efficient :)

[pmanson0624]

Alot of home theater systems have a down firing sub. They sound good too.

[Xearo167]

You did pretty good on that design

[goobs52]

great for home theatre or in cinema applications... but i'd really like to know how it would fair in the large scale concert sounds, or even medium venue system applications... my idea of low end transducers is to push air 80hz and below into the listening area... to create the "thud feeling" in your chest/stomach/trouser legs. lol

[z030n3r]

It looks like a Transmission Line.. But there might be a problem with the amount of time it will take for the sound waves to exit the box from the rear or the speakers.

[goobs52]

@z030n3r theoretically it could, if the port distance was too long, endup cancelling out some of the higher low frequencies... but in practice it may just be the ducks guts...

[Proaudiostore]

@z030n3r Mega lol.are you sure?

[TheKoups]

the "bass ports" can both make your low end sound good or kill it. the port/s have to be make to the correct length and placed in the correct place. alot of peaple "get lucky" doing this but there is alot of science behind it.

[MrStuntmonkey]

So do the vents on the box make the sound better?

[MrSexyboom]

yea ... in a weird way but yes ... it does help ur bass

[BOSEROCKS1]

It helps amplify low frequencies due to the design of the waveguide.... i might try that with my bose woofers, see what i can get

[MrStuntmonkey]

ohh okay Thankyou mr. Sexy Boom.. booom..pow

[XXRubixCubexX]

LMFAO!

[slipknot555133]

ya it makes it able to hit lower frequencies..but if you like bass that its hard you wouldnt like a vented box

[miketeecvx]

@MrStuntmonkey not better, louder... sealed sounds better

[BIGGIEDEVIL]

you saying sealed is louder? i don't think so no one in comps are using sealed! sealed is about SQ not SPL and is not louder, it takes more power to make them go to full excursion thou

[miketeecvx]

i said ported is louder sealed sounds better LOL

[ManRossDamn]

@miketeecvx EHHHHHH! Wrong.

Ported sounds better, if they know how to make it right.

[scbjgs]

@ManRossDamn ANY ported box i've ever heard sounds....sloppy...or laggy if you will. i think that sealed boxes sound a lot more crisp.

[ManRossDamn]

@scbjgs Wrong.

Only a box without proper sealing along with 90 degree corners and without supports sound sloppy.

Besides, ANY shitty ass sealed box will NOT hit lower, nor louder, nor crisper, nor cleaner. Just a fact for you :)

[scbjgs]

@ManRossDamn calm down dude. i'm just voicing my OPINION, as are you. i personally prefer sealed boxes. you prefer ported. big deal.

[awsomecuber]

@ManRossDamn tell that to rythmik audio, svsound, or elemental designs whose ported AND sealed subs hit relatively the same depth at reference levels on almost ALL of their models. seald or ported it doesnt matter. it all depends on how well it was engineered.

[pcfxer]

Hrm, interesting but a "properly" designed vented enclosure shouldn't need to be fancy in anyway. The key, I have found is to keep things as simple as possible, straight and long. This design seems to be a TL - type of enclosure which is COMPLEX to simulate; trust me :p.

[dark666apoc]

actually youd be surprised by the amount of designing that goes into logitech subs they do use tangbands:P

and as far as tuning goes tat tuning frequency is only good for slightchanges in response but for hometheatre use you tune lower becasue movies and such get much lower then music usually does the point of the lower tuning is to lower the amount of control the speaker has at the said frequency

[lou21000]

I build the same box for 2 12" RF 1000 Watts 2 voice coils.

Watch this Vid 21000.

[coolkidcoolkid1234]

yea i guess so

[pmanson0624]

@dark666apoc Yeah logitech really puts thought into thier designs. esp the computer sound systems ! Cant say Ive came across a home theater system by them yet tho

[dlzonwlz]

@dark666apoc or because too much bass sounds like shit with movies. lower tuning gives it better sound quality and limits the output of the speaker

[PeleGiannisGalpe]

@dark666apoc dude what the fak can i do to get lower bass form my z2300? :D

design a new box perhaps?

[dragonblood199]

I have 1 like that but its just 1 sub and its for my logitech computer speakers =D

[coolkidcoolkid1234]

urs is not like that though if its logitech cuz this has a wave guide and for both subwoofers so yea its a totally different design

[calvinyuenblinke]

Nice design but whats it tuned to?

[coolkidcoolkid1234]

srry dude im not technical enough lol to know about that

[calvinyuenblinke]

lol well when u build a box you need to know the tuning.. dont just randomly build one lol

[coolkidcoolkid1234]

srry dude tell me how to find out the tuning lol cuz im not very sure about things like that

[pcfxer]

Measure the length of one "tube". Let's see if it is a TL type first. simple wave eq'n (v (sound) = wavelength*frequency). We have v (assumed 341m/s, wavelength*4 (resonance in open tube), and frequency is unknown.

Rearrange -> freq = lengthoftube*4/speed of sound.

Plug that in and let us know ;). Perhaps I can make a video discussing Transmission Line Subwoofer design basics.

[coolkidcoolkid1234]

the design of it for 6.5 subs using both and facing the floor its probably tuned to like 23 or 20 hz thats what id guess it would be

[chepsy]

wow 20 hz. you probably couldnt hear it.

[680hpBMWdave]

I have my box in my truck for 2 12's tuned to 23hz and i can be heard from quite the distance. But 20hz is the limit to human ears, you wouldnt hear anything just feel everything shaking.

[coolkidcoolkid1234]

yea true

[mm34rider]

@680hpBMWdave 18 hz :]

[atomdragon4]

Nice design

[coolkidcoolkid1234]

thanx dude

[audiogod9000]

i like

lol awesome

thats the box im going to do

[coolkidcoolkid1234]

cool i cant wait to see it man give me a vid update when ur done i really would love to see that man lol good luck

[audiogod9000]

lol ok i will

probly in a week (prob sooner)

[coolkidcoolkid1234]

that is gonna be nice

[audiogod9000]

lol yeah

well i hope it is,lol

[coolkidcoolkid1234]

that will be cool

[audiogod9000]

lol