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Old 23rd January 2013, 12:22 PM   #21
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Quote:
Originally Posted by tvrgeek View Post
Now to some of the other remarks. Speaker "seeing" a cabinet. OK, never seen eyes on a speaker. A vary large box is essentially free air. Anything over about two or three times VAS basically. I think that is what was being intended.


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Old 24th January 2013, 08:53 AM   #22
DeonC is offline DeonC  South Africa
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Oh c'mon you guys. No-one? Ok, let me try again. Here are three candidates for you to play with. What would these do in a tapped horn. No need to go really low, just give a good thump in the chest (if that's possible). Maybe one design for efficiency and one design for bass depth. Here are the three candidates, all from Tang Band:

Tang Band W3-1876S 3" Mini Subwoofer

PRODUCT SPECIFICATIONS:
Power*Handling*(RMS): 15*Watts*
Power*Handling*(max): 30*Watts*
Impedance: 4*ohms*
Frequency*Response: 55*to*2,000*Hz*
Sensitivity: 76*dB*1W/1m*
Voice*Coil*Diameter: 0.80"*

THIELE-SMALL PARAMETERS:
Resonant*Frequency*(Fs): 55*Hz*
DC*Resistance*(Re): 3.6*ohms*
Voice*Coil*Inductance*(Le): 0.19*mH*
Mechanical*Q*(Qms): 3.17*
Electromagnetic*Q*(Qes): 0.50*
Total*Q*(Qts): 0.43*
Compliance*Equivalent*Volume*(Vas): 0.03*ft.³*
Mechanical*Compliance*of*Suspension*(Cms): 0.74*mm/N*
BL*Product*(BL): 5.28*Tm*
Diaphragm*Mass*Inc.*Airload*(Mms): 9.98g*
Maximum*Linear*Excursion*(Xmax): 5*mm*
Surface*Area*of*Cone*(Sd): 27*cm²

Tang Band W3-2000 3" Neodymium Subwoofer

PRODUCT SPECIFICATIONS
Power*Handling*(RMS): 12*Watts*
Power*Handling*(max): 25*Watts*
Impedance: 4*ohms*
Frequency*Response: 55*to*1,800*Hz*
Sensitivity: 80*dB*1W/1m*
Voice*Coil*Diameter: 0.79"*

THIELE-SMALL PARAMETERS
Resonant*Frequency*(Fs): 55*Hz*
DC*Resistance*(Re): 4*ohms*
Voice*Coil*Inductance*(Le): 0.31*mH*
Mechanical*Q*(Qms): 4.53*
Electromagnetic*Q*(Qes): 0.37*
Total*Q*(Qts): 0.34*
Compliance*Equivalent*Volume*(Vas): 0.04*ft.³*
Maximum*Linear*Excursion*(Xmax): 1.75*mm

Tang Band W3-1750S 3" Neodymium Subwoofer

PRODUCT SPECIFICATIONS:
Power*Handling*(RMS): 25*Watts*
Power*Handling*(max): 50*Watts*
Impedance: 8*ohms*
Frequency*Response: 65*to*800*Hz*
Sensitivity: 84*dB*1W/1m*
Voice*Coil*Diameter: 1.26"*

THIELE-SMALL PARAMETERS:
Resonant*Frequency*(Fs): 65*Hz*
DC*Resistance*(Re): 6.5*ohms*
Voice*Coil*Inductance*(Le): 0.30*mH*
Mechanical*Q*(Qms): 5.50*
Electromagnetic*Q*(Qes): 0.34*
Total*Q*(Qts): 0.32*
Compliance*Equivalent*Volume*(Vas): 0.06*ft.³*
Mechanical*Compliance*of*Suspension*(Cms): 0.93*mm/N*
BL*Product*(BL): 7*Tm*
Diaphragm*Mass*Inc.*Airload*(Mms): 6g*
Maximum*Linear*Excursion*(Xmax): 1.75*mm*
Surface*Area*of*Cone*(Sd): 3.20*cm²
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Old 24th January 2013, 09:11 AM   #23
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by DeonC View Post
just give a good thump in the chest (if that's possible).

Tang Band W3-1876S 3" Mini Subwoofer

Power*Handling*(RMS): 15*Watts*
Sensitivity: 76*dB*1W/1m*
Resonant*Frequency*(Fs): 55*Hz*


Tang Band W3-2000 3" Neodymium Subwoofer

Power*Handling*(RMS): 12*Watts*
Sensitivity: 80*dB*1W/1m*
Resonant*Frequency*(Fs): 55*Hz*

Tang Band W3-1750S 3" Neodymium Subwoofer

Power*Handling*(RMS): 25*Watts*
Sensitivity: 84*dB*1W/1m*
Resonant*Frequency*(Fs): 65*Hz*
Yeeeaahhh....I don't see that happening. I'm sure you could put one of these in a tapped horn, but what you'd have is at best a miniature low-tuned midrange driver with mid 80's efficiency that that you could bottom out with a bass clarinet.

I'm still mystified why they call these subwoofers.
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Old 25th January 2013, 06:41 AM   #24
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I have seen a lot and tried a lot, and listened to a lot. but I have never ever had the thump in the chest from small drivers. The closest was a from a 8 inch JBL GTi automotive woofer in a tapped horn - But no real bass what so ever. Impressive at first listen, and boring in the long run.

From my experience a real thump in the chest combines with real bass extension starts with 12" woofers and up. And even a 12" woofer only just gives you an idea of what to expect with even more cone area. Also the midrange is important. I have tried small midrange and large midrange. A 4" midrange crossed between 200-400 Hz, combined with a larger woofer do not give that kick. A large 10" fane studio 10M crossed similar and with same woofer and same in room SPL gives the kick. And you don't need to play loud to get that kick.

You have to know what is going on here. A rock and roll kick drum is full bodies. It have lows mids and highs. Take one item out of the equations is not recommended.
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Old 27th January 2013, 08:04 AM   #25
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If you have enough room for a "really huge box" why not put in a Lg. bass/suboofer driver & use the 3.5" hole for the port? You'd have Way more success with that idea.

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Old 28th January 2013, 10:18 AM   #26
grec13 is offline grec13  United States
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Quote:
Originally Posted by realflow100 View Post
How low can a high excursion 3.5" subwoofer go in this kind of box with a really powerful amplifier? (400 watt amplifier)
Not to kill the speaker but enough to drive the speaker Just under it's true limits without distorting or get too hot
And with a really large passive radiator in a big box?
How much bass could it really put out? Would you feel vibrations in your windows in your car? of course you may not see them but could you feel it?
there is NO 3.5" subwoofer
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Old 28th January 2013, 04:45 PM   #27
OscarS is offline OscarS  United States
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Quote:
Originally Posted by DrDyna View Post
Yeeeaahhh....I don't see that happening. I'm sure you could put one of these in a tapped horn, but what you'd have is at best a miniature low-tuned midrange driver with mid 80's efficiency that that you could bottom out with a bass clarinet.

I'm still mystified why they call these subwoofers.
They would only be useful for nearfield "computer" type desktop speaker systems.

I think I modeled one of those TBs (the square one I think) in an 8th order BP, and the frequency response & sensitivity came out decent for a desktop computer system.
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Old 28th January 2013, 08:13 PM   #28
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Quote:
Originally Posted by grec13 View Post
there is NO 3.5" subwoofer
You should go sue the computer and speaker business...
It "requires no test"... "and there is no way to evaluate the extravagant claims".
My computer has a sub though (see post #15).
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Old 28th January 2013, 08:22 PM   #29
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Still waiting for a reply from the OP on this thread!
What?....no response from realflow100 in the house???
The rest of the comments are really of no value as you're just talking to yourself and maybe looking for a useless argument over nothing....
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Old 28th January 2013, 08:25 PM   #30
sreten is offline sreten  United Kingdom
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Hi, the argument was always useless, just fantasy from the OP, rgds, sreten.
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