Woofers

[killerkowalczyk]

Is there any possible way for companies to make an 8" woofer with an Fs around 25hz, Vas of 1.5cuft, spl of 91 1w/1m, and QTS of 0.4

I think that would be the dream driver. How do these commercial companies make such small enclosures with good bass.

[rudyjakubin]

> Is there any possible way for companies to
> make an 8" woofer with an Fs around
> 25hz, Vas of 1.5cuft, spl of 91 1w/1m, and
> QTS of 0.4

Almost an MCM 55-2421;
<A HREF="http://site.mcminone.com/product.asp?catalog">http://site.mcminone.com/product.asp?catalog</A>%5Fname=MCMProducts&product%5Fid=55%2D2421

I've got one in a duanebro 0.5 cu. ft slot-port box.
I know I'll get flamed for steering you to this, but my 8 incher hasn't come apart yet and Bill FitzMaurice recommends them in his Tuba 18's and AutoTuba's.
So a lot of people have used them.
It's the only 8 incher so far that can handle 'Laurie Andersons - Life On A String'...
It's wild to see that cone pump it's arse off to keep up.
I haven't tried the Quattro 8 yet, but it's on my list.
Oh yeah, that duanebro box sure kicks bootie. Nice design as to how it solves long port lengths and chuffing.
<A HREF="http://members.shaw.ca/pferlow/port_basics.htm">http://members.shaw.ca/pferlow/port_basics.htm</A>

[Pete Schumacher ®]

> Is there any possible way for companies to
> make an 8" woofer with an Fs around
> 25hz, Vas of 1.5cuft, spl of 91 1w/1m, and
> QTS of 0.4

> I think that would be the dream driver. How
> do these commercial companies make such
> small enclosures with good bass.

To answer you question succinctly . . . It's impossible to get those specs.

If you have Fs = 25, Qts = .41, and Vas = 42L, then the sensitivity is ~77dB/w. You just can't get all those specs together. If you want 91dB, then Vas will have to be MUCH higher.

[johnnyrichards]

All those cemmercial companies use low to mid effiency drivers coupled with massive amplification and gobs and gobs of equalization.
In other words, the Drake.

[Chris Roemer]

> Is there any possible way for companies to
> make an 8" woofer with an Fs around
> 25hz, Vas of 1.5cuft, spl of 91 1w/1m, and
> QTS of 0.4

> I think that would be the dream driver. How
> do these commercial companies make such
> small enclosures with good bass.

The WinISD DB has this driver:
Audiomobile M 2010 S4
Qts=39
Vas=1.6
Fs=26
SPL=88
However, this is listed as a 10" driver.

What interests you in this suite of T/S parms?