[Shotimes] subwoofer replacement

Thu, 5 Jun 2003 13:17:57 -0400

On the spec sheet for the sub, it will show the volume needed, and it
should say if that includes driver displacement or not.  The other way
to figure it out, which can be done with a JL driver in particular, is
to look at the recommended enclosure that is given on the spec sheet.
You can figure out what the cubes of it are, and then compare that to
the recommended size and see if it is greater then the recommended by
the size of the driver.  And yes, you can estimate the displacement of
the driver by measuring from the bottom of the mounting lip to the
magnet.

Bill Murray

-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net] On Behalf Of Kevin & Cheryl Airth
Sent: Thursday, June 05, 2003 11:29 AM
To: Bill Murray; SHOTimes
Subject: Re: [Shotimes] subwoofer replacement

Bill:
 I could not get a 8" with the correct dimension for the box. They were
all
too deep. I wanted to avoid modifying the stock box if possible at that
time. In fact the JL unit is pretty tight for depth as it is. I must
have my
dimension wrong on the JBL box? I will double check!
.
.
I think I misspoke-I calculate the JBL box around .25 ft3? This brings
up a
question I never got a good answer on. When calculating box volume does
the
volume of the driver need to be subtracted from the total? How do you
get
the driver volume? Estimate from the dimensions?
.
.

> If the JBL box is indeed .33 ft3, the 6w0 is too small.  According to
> JLs site, the 6w0 works best in a sealed enclosure between .15-.22
ft3.
> I would side more towards the smaller side to get the tightest and
most
> accurate sound possible.  The 8w0 on the other hand requires .3-.6
ft3,
> so the JBL box would be about perfect for the 8w0.  So I'd still go
with
> an 8", plus an 8" is much more available from other manufactures, then
a
> 6" is.  And the 8" will be louder, if thats what you're looking for
by
> upgrading.
>
> Bill Murray.
>
> -----Original Message-----
> From: Kevin & Cheryl Airth [mailto:clubairth@peoplepc.com]
> Sent: Wednesday, June 04, 2003 3:43 PM
> To: Bill Murray; SHOTimes
> Subject: Re: [Shotimes] subwoofer replacement
>
> Bill:
>  I think your right on the signal level. Also that small of a driver
> needs
> to be pushed harder to get as low as possible. The box volume is
> acutally
> almost perfect for the JL Audio speaker. We have somewhere around .33
> ft3 in
> the box and that's within the recomened range for the subwoofer. The
8"
> models usually are looking for more volume. I thought about a free air
> setup
> but nobody I talked to had any good comments. I also could not find
> anybody
> with decent sound running one.
> .
> .
>
>
>
> > There are 2 reasons why it sounds better with better amp running it.
> > The JBL amp is 6ohms, and if you run the sub at 4 ohms, the JBL amp
is
> > most likely sending it a somewhat distorted signal.  The other
reason
> is
> > probably that the JBL box is either too big or too small for the JL
> sub.
> > If I was looking to keep the same mounting style, I would either
find
> an
> > 8" sub that worked with the volume of the JBL sub box, or get
> something
> > like the JL IB8, with is a free air sub, and just mount it to the
top
> > half of the JBL box, and leave the bottom half off.  When I bought
my
> > first SHO, it had an MTX 8" sub in the JBL sub box, running off a
120w
> > Sony amp.  It wasn't a window shacker, but it was ok, at low to
> moderate
> > listening levels.
> >
> > Bill Murray
> >
>
> >
> > Jim:
> >  He is wrong. The 6W0 is different from the rest of the JL line. It
is
> > single voice coil only and 4 or 8 ohms depending on how you wire it
> up.
> > One
> > part number only.  Here is the factory page for this unit. I don't
> know
> > what
> > the retail price is.
> > http://www.jlaudio.com/subwoofers/6w0.html
> >
> >  One of mine runs just fine using the stock JBL amp but I think it
> > sounds
> > better with higher quality electronics pushing it. It really is too
> > small to
> > be a proper subwoofer but I like how the box fits the car.
> > .
> > .
> >
> >
> >
> >
> > > My son in law owns a stereo shop in Ohio.  He says (can't back it
> > myself
> > > because I haven't heard one personally) that the JL Audio speakers
> > required
> > > more to drive them than the JBL amp will put out.  Also, 6WO is
only
> > part
> > of
> > > the number.  you have to specify the Ohms since JL makes them in
> > 4,6,8,and
> > > 12 Ohms (I think it was a 6WO-6) or something like that)
> > >
> > > Jim
> > >
> > >
> >
> > >
> > > Joe:
> > >  I found a perfect drop in high quality replacement. JL Audio
makes
> > 6.5"
> > > subwoofer. 6W0. They are a little hard to find. I got two on E-bay
> for
> > > $70/pair. Used one in a stock application and sounded great. I
used
> > the
> > > other speaker in my aftermarket setup. I added the factory box and
> did
> > not
> > > like the factory driver. Comparing the stock JBL to the JL unit
> shows
> > the
> > > quality difference!
> > > .
> > > .
> > >
> > >
> > >
> > > > Sounds like a great choice.  I tried 4-ohm and 8-ohm
replacements
> > when
> > my
> > > > original sub went bye-bye.  Not because I expected them to work,
> > just to
> > > see
> > > > what would happen.
> > > >
> > > > Result (as most of you expect): sounded horrible.
> > > >
> > > > I ended up getting an OEM replacement (thanks Al).
> > > >
> > > > Steve "Still have to pop zits once in a while" Tatro
> > > > Red/Black '93 with 167k miles
> > > > Cincinnati, Ohio
> > > >
> > >
> > > >
> > > > > PIONEER C16EU20-52D 6-1/2" POLY WOOFER
> > > > >
> > > > >
> > > > > it has the correct resistance (6 Ohms)
> > > > > and can be bought from:
> > > > >
> > > >
> > >
> >
>
http://www.partsexpress.com/webpage.cfm?webpage_id=3&SO=2&&DID=7&CATID=4
> > 9&Ob
> > > > > jectGroup_ID=488
> > > > >
> > > > > pardon me....  I have to go pop my zits
> > > > >
> > > > >
> > > >
> > > > >
> > > > > I posted earlier today about an inoperative subwoofer.
> > > > >
> > > > > The winners are Jim Leyden and Dave Kegel for suggesting it
> might
> > be
> > the
> > > > > speaker itself.  Volt meter says there is current coming to it
> > (fraction
> > > > of
> > > > > a volt, does that seem right?) and resistance across the
> terminals
> > of
> > > the
> > > > > speaker is infinite.
> > > > >
> > > > > So I'm off to the store.  Someone recently recommended a
> > particular
> > > brand
> > > > > and model number as a good replacement for the stock subwoofer
> ---
> > could
> > > > > someone repost that info?  Please?  Thanks much.
> > > > >
> > > > > Also, where's a good source for the rubber grommets used where
> the
> > > > mounting
> > > > > studs come up through holes in the parcel shelf?
> > > > >
> > > > > Joseph van Oss
>
>
>
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