Really cool idea for speakers

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DonNiggera

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Dec 19, 2000
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I saw this in some of the speakers I have at home, they astounded me when I first saw them...

Instead of using a Bass Tube Hole thingy, put a huge speaker cone (no magnet, wires, or anything) on the side of the speaker cabinet, and the air pushed from the mid range will create bass through the speaker!

In the one I have, it uses a 2" tweeter on top, a 5" mid range, and a 15" "woofer", the woofer being nothing more than a speaker cone. It acts as if it was actually powered too! And the more powerful of a midrage you have, the better the woofer acts :) Great invention, no name on the speaker box though.
 
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DonNiggera

Senior member
Dec 19, 2000
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Yeah, whatever it is, why don't people use these? I was thinking of adding a big fake woofer to all the speakers in my house :)
 
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Viperoni

Lifer
Jan 4, 2000
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Yup a passive radiator indeed.
Unfortunately, the PR works as a port, and if you tune it too low (PR is too heavy for its given diameter) you get less bass (for music).......PR's are much more sensitive to proper tuning, which is why they're scarce (especially in the crapmercial speaker market)
However quite a few awesome home theatre subs have been made using PR's......
 
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Lifer
Jan 4, 2000
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Basically unless you've designed speakers, or at least subs, and a few, and you know all the factors involved in making a sub (such as how volume affects step response and SPL) I'd STRONGLY recommend you leave your stuff alone.
 
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Lifer
Jan 4, 2000
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<< The results below compare the Power15 to the (Velodyne) F1800 in the 2136ft3 room.

Average SPL 25Hz to 62Hz
Velodyne F1800 - 112dB
Stryke Power15 - 117.8dB

SPL at 16Hz 10% distortion
Velodyne F1800 - 102dB
Stryke Power15 - 110.5dB

SPL at 20Hz 10% distortion
Velodyne F1800 - 106dB
Stryke Power15 - 110.1dB
 >>

 
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ThisIsMatt

Banned
Aug 4, 2000
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Um, yeah, it's a passive radiator. My speakers (Radio shack baby! Actually they sound pretty good) have them, same size as the woofer so it looks like each box has two ;) and also my dad has a pair of ESS speakers with a PR in the rears...
 
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DonNiggera

Senior member
Dec 19, 2000
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So the 3 15" PR's almost double the volume? (10db is double [something like that]) And it probably costs about 10 cents to put one in?

The "PR's" in my speakers look exactly like real speakers though, unlike the Stryke 15 things...
 
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Lifer
Jan 4, 2000
11,084
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<< So the 3 15" PR's almost double the volume? (10db is double [something like that]) And it probably costs about 10 cents to put one in? >>



no no no

all PR's do is TAKE THE PLACE OF THE PORT.
They function almost the same as a port (except a bit laggier giving you looser bass, but no port noise at all since there is no port)

Also, you need a driver that can actually move the PR to begin with........the Power 15 project has a woofer with over 1inch of linear stroke.......your mid would be lucky to have 1/8th of a inch :Q
 
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DonNiggera

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Dec 19, 2000
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Well, it does make it louder, as indicated by the decibles.

The mid-range I put in had a lot of "stroke", it would be around 1 1/2 inches, got it from a mid 1950's radio :/
 
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Lifer
Jan 4, 2000
11,084
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<< Well, it does make it louder, as indicated by the decibles.

The mid-range I put in had a lot of "stroke", it would be around 1 1/2 inches, got it from a mid 1950's radio :/ >>




Nope, but I guarntee you you'd lose SPL.

LOL 1-1/2inches!
Even a $100 Dynaudio 5inch woofer only has about 12mm of stroke.

*stroke is how far the magnet can push the cone, linearly*
 
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DonNiggera

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Dec 19, 2000
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The BEST sub would have to be the ServoDrive ContraBass (I believe that's the name anyway) I can't find the webpage for it right now though, but it was like, 16hz at 160db's...or something like that.
 
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Lifer
Jan 4, 2000
11,084
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<< The BEST sub would have to be the ServoDrive ContraBass (I believe that's the name anyway) I can't find the webpage for it right now though, but it was like, 16hz at 160db's...or something like that. >>



Not even the loudest car audio vehicle on the PLANET can hit 160db's @ 16hz.......
 
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DonNiggera

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Dec 19, 2000
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It wasn't a car audio speaker :p It's a home theatre speaker. It's somewhere in the $5000 range too..

The 5" mid range I have has a tiny magnet, weighs about 1 ounce :/ It probably moves a lot just because the cone is utter crap, too.
 
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yakko

Lifer
Apr 18, 2000
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<< Yeah, whatever it is, why don't people use these? >>

My Klipsch KG3s use one. Klipsch used them on a few different models.
 
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Lifer
Jan 4, 2000
11,084
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<< It wasn't a car audio speaker :p It's a home theatre speaker. It's somewhere in the $5000 range too..

The 5" mid range I have has a tiny magnet, weighs about 1 ounce :/ It probably moves a lot just because the cone is utter crap, too. >>




Well if a car competition vehicle that costs over $100,000 can't hit 160dbs @ 16hz, thers no farking way you're going to hit that in your HT with $5k

Note that the very same Power15 cabient that got 120db in room would hit 145db's at least in a car......................
 
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DonNiggera

Senior member
Dec 19, 2000
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There is this one dude from Car Tunes where I live who has a van with 48 12" Digital Design 5000's (or was it 3500's?) and he hit 165 db or so
 
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Lifer
Jan 4, 2000
11,084
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<< There is this one dude from Car Tunes where I live who has a van with 48 12" Digital Design 5000's (or was it 3500's?) and he hit 165 db or so >>



Probably at 50hz+ list most other SPl vehicles........

You said



<< The BEST sub would have to be the ServoDrive ContraBass (I believe that's the name anyway) I can't find the webpage for it right now though, but it was like, 16hz at 160db's...or something like that. >>



and im telling you that if vehicles built for competition can't hit that much SPL @ 16hz, you have NO CHANCE of doing it in your living room.
 
N8Magic

N8Magic

Lifer
Dec 12, 2000
11,624
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I wish I could find a link to an article I read in Sound & Vision about a guy who used a room in the basement of his house as the enclosure for a subwoofer, and the vent in the floor between that room and the living room as the port. The walls were reinforced to handle the extra strain, and soundproofing material was used as well.

It had a bunch of drivers and some ridiculously powerful amps. He actually BLEW OUT THE WINDOWS in his living room when he turned it up too loud the one night.

Impressive to say the least. I just wish I had the specs!
 
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Lifer
Jan 4, 2000
11,084
1
71


<< I wish I could find a link to an article I read in Sound & Vision about a guy who used a room in the basement of his house as the enclosure for a subwoofer, and the vent in the floor between that room and the living room as the port. The walls were reinforced to handle the extra strain, and soundproofing material was used as well.

It had a bunch of drivers and some ridiculously powerful amps. He actually BLEW OUT THE WINDOWS in his living room when he turned it up too loud the one night.

Impressive to say the least. I just wish I had the specs! >>




I already linked to it higher up :)
1 dozen 12inch Shiva's in the guys basement venting into his listening area
 
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