The Subwoofer Site

I have a question I'll try to make brief, I sold a JL Audio 10" subwoofer on ebay in mint condition and worked perfectly fine, the buyer opened a dispute saying he bench tested the speaker and one of the voice coils were blown, he wanted to keep the speaker but with dispute he was forced to send it back, When I received my subwoofer back there is a 2.5" hole along the foam of the cone and more then half the cone is unglued, it looks to me like the foam is dry rotted. This clearly isnt the speaker I sent him so I had to appeal his dispute, since I now believe he still has my speaker and got his money back and I'm stuck with a beat up speaker. He never stated in his dispute that the cone was damaged in anyway, I am under the impression that with the gapping hole in the cone he wouldn't of been able to bench test it to even find out the voice coil was blown, am I correct?? And if anyone knows what that kind of damage does to the subwoofer?? To me it looks like my perfectly good subwoofer is perfectly shot now. Can anyone help me??

This has somewhat happened to me before, If you have taken any pictures of it when you are trying to sell it, see if you have any of the area the number is located, and try to zoom in and touch it up so it is able to read, if you have a picture of it, but not able to read it, I'd be more than happy to auto adjust it for you to get him. Otherwise, like the guy before me said, its gonna be a loss.

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What system using the factory cd player would be best for the best sound subwoofer in my car and about how much am i looking for?

http://www.crutchfield.com/S-u3mTVN07J1K/cgi-bin/ProdView.asp?g=510&I=236T4510X3

http://www.crutchfield.com/S-u3mTVN07J1K/cgi-bin/ProdView.asp?g=120&I=113KAC9103

I have installed this set in 3 cobalts quite popular. Not the cheapest way to go but very nice for the money. Another cheaper option is

http://www.crutchfield.com/S-u3mTVN07J1K/cgi-bin/ProdView.asp?g=51000&tab=essential_info&i=236RTAMP#Tab

not as much power or bass but should be suficiant for your aplication.

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Is kicker supposed to be a bad brand or what? Someone keeps telling me they are but then again I hear a lot of good things about there products.

Kicker subs are pretty good if you like SPL. That is what they are mainly designed for and they accomplish this very well. The L7 is a very good SPL sub and is used in SPL competitions all the time.

A lot of what people say about Kicker is mostly just personal opinion. I'm sure your going to hear many people saying that Kicker sucks and others that say Kicker is the best. It has a lot to do with your own opinion on how the subs sound. If you like SPL and are not concerned with SQ then I would say to look into kicker.

Kicker does make pretty good subs while their amps and speakers, on the otherhand, can be up for debate.

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I was wondering if had lets say four cheaper subwoofers, would they be louder than two decent subs? Ok, so would four of these pioneer premiers:
http://www.sonicelectronix.com/item_9235_Pioneer+Premier+TS-W2501D4.html
be louder than two of these Orion HCCA's:
http://www.sonicelectronix.com/item_9802_Orion+HCCA+10.4+-HCCA10.4-.html
And also, would three of those Premier's be louder than the HCCA's.

to answer this question is so simple , ok just look into some spl comps and see what people are pulling up the big #'s with. Definitely not 4 800 watt rms pioneer subs , i'll take the hcca's over the pioneers any day ,,, o and two orion hcca's are hitting 154.7to 157.5 bd spl your lucky to get 147bd with the 4 pioneers,,now if your looking for loud subs and not so worried about price get your self a FI you can get them custom built to you liking for about 500 and smoke the competition, just look into some comps.or the usac records … FI's btl , Orion'sHCCA and RE audio's MT's , these are the subwoofers to own.

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I am planning on doing a home theater subwoofer build and I am looking for overall deep and loud bass. Of the above two options, which one will lets me accomplish this?

The performance of conventional passive-radiator loudspeaker systems and vented-box loudspeaker systems are substantially the same. Passive-radiator loudspeaker systems are a type or variant of vented-box loudspeaker. They closely follow the same design principles and methodology used for vented-box loudspeakers and offer similar performance to their vented/ported/bass-reflex enclosure counterparts. Passive radiator enclosure designs do NOT offer greater low-frequency extension or output than similar vented enclosure designs.

Passive-radiator designs offer their own advantages and disadvantages over their vented/ported/bass-reflex cousins. Advantages include the elimination of vent colorations, such as vent pipe resonances, wind noise from air turbulence that can often result from improper vent design and internal (mechanical) noise that can be reflected through vents or ports. Properly designed vents for low-frequency enclosures require a minimum vent area. The required minimum vent area will increase incrementally in direct proportion to an increase in the total volume displacement and a decrease in the box tuning frequency. Likewise, for the common ducted vent or port design the larger the vent area the longer the duct length. As one might imagine long vent ducts can easily cause problems or difficulty designing smaller loudspeaker enclosures. Passive radiators used in place of ducted vents or ports solve these problems.

Also, it is important to remember that many—if not all—conventional moving-coil drivers vary widely from their published Thiele-Small parameters. Thus relying upon a manufacturer's published Thiele-Small parameters often creates difficulty when it comes to precisely tuning a vent or vents in a vented-box enclosure. The use of passive radiators greatly simplifies the physical box tuning process.

The disadvantages of standard passive-radiator enclosure designs is a steeper low-frequency roll-off, which in turn results in somewhat poorer transient performance, a higher cut-off frequency and slightly greater overall system loss, i.e., Q-sub-L, in comparison to their vented counterparts. The augmented passive-radiator design, attributed to Hossbach and Clarke most notably, effectively eliminates the disadvantages associated with conventional passive-radiator designs while offering additional performance advantages. The downside to the augmented passive-radiator design is that you would have to construct your own augmented passive radiator as there are no commercial off-the-shelf augmented passive radiators available.

One of the most popular “vented-box” subwoofer designs is the 2:1 passive-radiator design. Head over to the Home Theater Shack forums and read some of the discussions and tests of various DIY and commercial subwoofer designs.

######################## RESOURCES ########################

diyAudio.com Wiki: types of subwoofer
http://www.diyaudio.com/wiki/index.php?page=types+of+subwoofer

Does anybody know the meathod to work out the porting for my bass cabenet? [sic]
http://answers.yahoo.com/question/index?qid=20080421141305AAdKp8f

Home Theater Shack forums
http://www.hometheatershack.com/forums/
– New Passive Radiators from Creative Sound
http://www.hometheatershack.com/forums/diy-subwoofers/6268-new-passive-radiators-creative-sound.html?pp=50
– 4 18" 5400’s and 8 passives “WOW!”
http://www.hometheatershack.com/forums/diy-subwoofers/9281-4-18-5400s-8-passives-wow.html?pp=50
– DIY TC Sounds LMS-5400 18" + 2×18" PR 200L *new*
http://www.hometheatershack.com/forums/subwoofer-tests/8156-diy-tc-sounds-lms-5400-18-2×18-page-ranking-200l-new.html?pp=50
– TC Sounds LMS-5400 18" sealed 75L vs. 200L *special test*
http://www.hometheatershack.com/forums/subwoofer-tests/12195-tc-sounds-lms-5400-18-sealed-75l-vs-200l-special-test.html?pp=50
– Home Audio Subwoofers - Subwoofer Tests - Fall 2007
http://www.hometheatershack.com/forums/home-audio-subwoofers/6656-subwoofer-tests-fall-2007-a.html?pp=50

Comments on Earl Geddes’ “Acoustic Lever” design:
http://www.audioroundtable.com/ProSpeakers/messages/188.html
http://www.audioroundtable.com/ProSpeakers/messages/208.html
http://www.audioroundtable.com/ProSpeakers/messages/209.html

GedLee LLC
http://www.gedlee.com

Loudspeaker Design Cookbook
http://www.audioxpress.com/bksprods/products/bkaa68.htm
audioXpress (Old Colony) Loudspeaker Reference Books
http://www.audioxpress.com/bksprods/BKSLOUREF.htm

Loudspeaker Design and Construction Resources
http://docs.google.com/View?id=dhpmqnbb_8cqqcq2gx
(Note: the resources will be updated on a regular basis)

################## TECHNICAL RESOURCES ##################

An Analysis of Design Conditions for a Phase-Inverter Speaker System with a Drone Cone
Nomura, Y.; Kitamura, Z.
IEEE Transactions on Audio and Electroacoustics
Oct 1973; Volume: 21, Issue: 5; pp. 397- 407
ISSN: 0018-9278
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1162502

Passive-Radiator Loudspeaker Systems Part 1: Analysis
Small, Richard H.
JAES Volume 22 Issue 8 pp. 592-601; October 1974
http://www.aes.org/e-lib/browse.cfm?elib=2739

Passive-Radiator Loudspeaker Systems, Part 2: Synthesis
Small, Richard H.
JAES Volume 22 Issue 9 pp. 683-689; November 1974
http://www.aes.org/e-lib/browse.cfm?elib=2731

The Drone-Cone, Phase-Inverter Loudspeaker
Olson, Harry F.
JAES Volume 21 Issue 7 pp. 582, 583; September 1973
http://www.aes.org/e-lib/browse.cfm?elib=1947

Recent Developments in Direct-Radiator High-Fidelity Loudspeakers
Olson, Harry F.; Preston, John; May, Everett G.
JAES Volume 2 Issue 4 pp. 219-227; October 1954
http://www.aes.org/e-lib/browse.cfm?elib=47

Design of Acoustic Lever Loudspeaker Systems, Part One
Phillips, Alan S.
AES Convention: 109 (September 2000) [Preprint] Paper Number: 5279
http://www.aes.org/e-lib/browse.cfm?elib=9059

The Acoustic Lever Loudspeaker Enclosure
Geddes, Earl R.
JAES Volume 47 Issue 1/2 pp. 3-13; February 1999
http://www.aes.org/e-lib/browse.cfm?elib=12118

Augmented Passive Radiator Loudspeaker Systems, Part 1
Clarke, Thomas L.
JAES Volume 29 Number 6 pp. 394-404; June 1981
http://www.aes.org/e-lib/browse.cfm?elib=3906

Augmented Passive Radiator Loudspeaker Systems, Part 2
Clarke, Thomas L.
JAES Volume 29 Number 7/8 pp. 511-516; July/August 1981
http://www.aes.org/e-lib/browse.cfm?elib=3896

________________________

United States Patent 6,782,112 (August 24, 2004)
Low Frequency Transducer Enclosure
Geddes, Earl R.
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6782112.PN.&OS=PN/6782112&RS=PN/6782112

United States Patent 6,704,426 (March 9, 2004)
Loudspeaker System
Croft, III, James J.
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6704426.PN.&OS=PN/6704426&RS=PN/6704426

United States Patent 4,076,097 (February 28, 1978)
Augmented Passive Radiator Loudspeaker
Clarke, Thomas Lowe
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=4076097.PN.&OS=PN/4076097&RS=PN/4076097

United States Patent 3,772,466 (November 13, 1973)
Loudspeaker System
Hossbach, Erich
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=3772466.PN.&OS=PN/3772466&RS=PN/3772466

United States Patent 4,350,847 (September 21, 1982)
Subwoofer System Using a Passive Radiator
Polk, Matthew S.
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=4350847.PN.&OS=PN/4350847&RS=PN/4350847

United States Patent 3,669,215 (June 13, 1972)
Passive Radiator for Use in a Bass Reflex Loudspeaker System
Kikuchi, Takeo; Hashino, Hisaaki
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=3669215.PN.&OS=PN/3669215&RS=PN/3669215

(If you would like to download U.S. Patents I recommend using the free patent search tool on www.pat2pdf.org)
 

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Sunfire Hrs-12 12″ Powered Subwoofer

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How do you improve the drivers that totally reshaped how the world looks at subwoofer performance? Turn loose KICKERs sick sub scientists and say WE WANT LOUDER! What youll get is a sub with longer throw, lower distortion, and impossible power handling for greater gut-pounding power potential than any KICKER sub - ever. From the glowing titanium on the ultra-rigid cone to the sturdy cast aluminum basket, every detail points to one purpose - over-the-top bass beyond your wildest dreams. When youre ready to test the limits of low and loud, youre ready for the Solo-Baric L7.

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The SWA1801 is an 18-inch high output, active subwoofer system. It features a newly designed high precision 18-inch transducer combined with application specific amplifier technology. The system is composed of a single, compact subwoofer cabinet with built in control and amplifier electronics.

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10″ Home Theater Powered Subwoofer Hd Audio Sub

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Custom Nissan 350z Sub Box Speaker Enclosure More Depth Compatible With Nissan, Nissan Models 350Z, Subwoofer and Speaker Accessory Type Box Hardware, Car Audio Accessory Type Subwoofer and Speaker Accessories

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