Anyone tried replacing the SVS driver before? (1 Viewer)

[Brett DiMichele]

Chris,

No flame war from me bud.. I think the W series ARE great
drivers and I think in general JL does make a great product.
I think the Brahma and Tumult are certainly better deals
than the JL (Because lets face it, Adire is no where near
as easily recognizeable as JL Audio) and you generaly pay
for strictly performance with very little flash with Adire.

The JL's look super sweet and they perform in the top 1% of
all drivers made..

That whole 170 DB from one 10" though.... I still can't
grasp it.. Unless you tune really high, in a super small
cabin with the Mic located 4" off the cone of the driver..

What will the driver do Anechoic? 120Db? So you mean it's
getting 50Db of cabin gain? That's crazy stuff

 

[JauCheeze]

Brett,

I don't know if ur into car audio, but there are plenty of car subwoofer drivers out there that can compete w/ subwoofers u've posted. Especially the pci and pc+ drivers...

 

[Brett DiMichele]

Cheeze,

Aside from DD, Re, JL and very few others... There are NOT
many "Car subs" that can compete with what I posted. Take
the Stryke Audio AV-12 (Absolute Value) for example. Do you
know of many other 12 inchers in the $140.00ea price range
that have 23mm of one way linear travel with an X-Mag of
30mm each way (that's not even X-Sus Mind you..) with an FS
of 19Hz and a relatively small VAS... These are very SERIOUS
subs.. And they only get better from there on up.. Like the
Lambada 12's, The HE12 and 15, the Brahma and Tumult, the
BPD1803 to name a few..

Aside from the "serious" car audio subs that we've already
covered.. There aren't many other competitors and the one's
that can compete are generaly 2 times the price (pay for
flash) of the subs I listed.

Mind you I am not considering subs like.... The Infinity
Perfect 12, as much of a sub... Or anything else "main stream"
because simply stated they cost too much and don't perform
nearly good enough.

The big dogs are Digital Designs, JL, Resonant Engineering,
Adire and a handfull of others I forgot to mention.

 

[Michael R Price]

What I don't understand is how the big long throw subs sound different from any old woofer in a car, since they don't get stressed at all. Can someone elaborate on the causes of distortion in an automotive subwoofer?

 

[Brett DiMichele]

Mike,

The throw is an issue in an HT because you tune the
enclosures lower.. Not many car subs are tuned to 19 or 20
Hz... Hell most of them have it's peak output in the 80Hz
region..

But distorion in any driver is caused when the voice coil
is not fully in the magnetic gap. You are loosing control
of the driver... That's why XBL2 Technology is so big to
the sub woofer's motor structure.. it has far less distorsion
even at the limits than a typical motor from what i understand.

 

[Michael R Price]

I agree, Brett, but won't the power levels and excursions (and hence also BL-induced distortion, thermal compression, etc) be very low in a car environment? Playing at 110db in a car is like playing at 80db in a room...

 

[MikeLi]

You guys please keep it up... I have actually learned alot by reading your posts....!!!! I really mean it... not trying to be funny here.

 

[Brett DiMichele]

Mike,

Well I think it depends on what motor design the car driver
uses. How long the VC is... To keep it in the gap.. How
loud you play it etc..

Sure your getting 20-30Db of cabin gain in a car compared
to what, 18Db of gain in a home and that's the max if you
use 3 boundry layers for gain (a corner) but if the car
sub is run harder then it's still going to distort..

I wonder what a typical distorsion figure is for a car sub
playing at moderate levels? I have no idea what it would be
like 10%? 5? We would have to know the distorsion level at
moderate volumes for both a car and a home sub.. I know
that some home subs have as much as 40% distorsion at max
SPL (that would be a Carver Sunfire Jr. for example) of
course a big sub like an SVS tube will exhibit much lower
levels of distorsion because it doesn't have to play as
hard to reach high output because it has a much larger VAS
than the small sub.

VAS plays a big part in this too.. Sure if you cram a
super high excursion driver in a small enclosure and feed
it tons of wattage you will see high output but also very
high distorsion compared to a similar sub running in a an
enclosure with lots of VAS that doesn't have to run half as
hard to acheive the same output..

I think that's why XBL2 came about.. The Tumult was made to
work in very small enclosures (where distorsion is higher)
and due to XBL2 it measures with less distorsion than your
typical driver (car or home).


Make any sense to you?